src/com/android/browser/BrowserActivity.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.browser;

import com.google.android.googleapps.IGoogleLoginService;
import com.google.android.googlelogin.GoogleLoginServiceConstants;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.app.SearchManager;
import android.content.ActivityNotFoundException;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.DialogInterface.OnCancelListener;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.AssetManager;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.DrawFilter;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.Picture;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.net.ConnectivityManager;
import android.net.Uri;
import android.net.WebAddress;
import android.net.http.EventHandler;
import android.net.http.SslCertificate;
import android.net.http.SslError;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Debug;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.provider.Browser;
import android.provider.Contacts;
import android.provider.Downloads;
import android.provider.MediaStore;
import android.provider.Contacts.Intents.Insert;
import android.text.IClipboard;
import android.text.TextUtils;
import android.text.format.DateFormat;
import android.text.util.Regex;
import android.util.Log;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.webkit.CookieManager;
import android.webkit.CookieSyncManager;
import android.webkit.DownloadListener;
import android.webkit.GeolocationPermissions;
import android.webkit.HttpAuthHandler;
import android.webkit.PluginManager;
import android.webkit.SslErrorHandler;
import android.webkit.URLUtil;
import android.webkit.WebChromeClient;
import android.webkit.WebChromeClient.CustomViewCallback;
import android.webkit.WebHistoryItem;
import android.webkit.WebIconDatabase;
import android.webkit.WebStorage;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLEncoder;
import java.text.ParseException;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Vector;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class BrowserActivity extends Activity
    implements KeyTracker.OnKeyTracker,
        View.OnCreateContextMenuListener,
        DownloadListener {

    /* Define some aliases to make these debugging flags easier to refer to.
     * This file imports android.provider.Browser, so we can't just refer to "Browser.DEBUG".
     */
    private final static boolean DEBUG = com.android.browser.Browser.DEBUG;
    private final static boolean LOGV_ENABLED = com.android.browser.Browser.LOGV_ENABLED;
    private final static boolean LOGD_ENABLED = com.android.browser.Browser.LOGD_ENABLED;

    private IGoogleLoginService mGls = null;
    private ServiceConnection mGlsConnection = null;

    private SensorManager mSensorManager = null;

    // These are single-character shortcuts for searching popular sources.
    private static final int SHORTCUT_INVALID = 0;
    private static final int SHORTCUT_GOOGLE_SEARCH = 1;
    private static final int SHORTCUT_WIKIPEDIA_SEARCH = 2;
    private static final int SHORTCUT_DICTIONARY_SEARCH = 3;
    private static final int SHORTCUT_GOOGLE_MOBILE_LOCAL_SEARCH = 4;

    /* Whitelisted webpages
    private static HashSet<String> sWhiteList;

    static {
        sWhiteList = new HashSet<String>();
        sWhiteList.add("cnn.com/");
        sWhiteList.add("espn.go.com/");
        sWhiteList.add("nytimes.com/");
        sWhiteList.add("engadget.com/");
        sWhiteList.add("yahoo.com/");
        sWhiteList.add("msn.com/");
        sWhiteList.add("amazon.com/");
        sWhiteList.add("consumerist.com/");
        sWhiteList.add("google.com/m/news");
    }
    */

    private void setupHomePage() {
        final Runnable getAccount = new Runnable() {
            public void run() {
                // Lower priority
                Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
                // get the default home page
                String homepage = mSettings.getHomePage();

                try {
                    if (mGls == null) return;

                    if (!homepage.startsWith("http://www.google.")) return;
                    if (homepage.indexOf('?') == -1) return;

                    String hostedUser = mGls.getAccount(GoogleLoginServiceConstants.PREFER_HOSTED);
                    String googleUser = mGls.getAccount(GoogleLoginServiceConstants.REQUIRE_GOOGLE);

                    // three cases:
                    //
                    //   hostedUser == googleUser
                    //      The device has only a google account
                    //
                    //   hostedUser != googleUser
                    //      The device has a hosted account and a google account
                    //
                    //   hostedUser != null, googleUser == null
                    //      The device has only a hosted account (so far)

                    // developers might have no accounts at all
                    if (hostedUser == null) return;

                    if (googleUser == null || !hostedUser.equals(googleUser)) {
                        String domain = hostedUser.substring(hostedUser.lastIndexOf('@')+1);
                        homepage = homepage.replace("?", "/a/" + domain + "?");
                    }
                } catch (RemoteException ignore) {
                    // Login service died; carry on
                } catch (RuntimeException ignore) {
                    // Login service died; carry on
                } finally {
                    finish(homepage);
                }
            }

            private void finish(final String homepage) {
                mHandler.post(new Runnable() {
                    public void run() {
                        mSettings.setHomePage(BrowserActivity.this, homepage);
                        resumeAfterCredentials();

                        // as this is running in a separate thread,
                        // BrowserActivity's onDestroy() may have been called,
                        // which also calls unbindService().
                        if (mGlsConnection != null) {
                            // we no longer need to keep GLS open
                            unbindService(mGlsConnection);
                            mGlsConnection = null;
                        }
                    } });
            } };

        final boolean[] done = { false };

        // Open a connection to the Google Login Service.  The first
        // time the connection is established, set up the homepage depending on
        // the account in a background thread.
        mGlsConnection = new ServiceConnection() {
            public void onServiceConnected(ComponentName className, IBinder service) {
                mGls = IGoogleLoginService.Stub.asInterface(service);
                if (done[0] == false) {
                    done[0] = true;
                    Thread account = new Thread(getAccount);
                    account.setName("GLSAccount");
                    account.start();
                }
            }
            public void onServiceDisconnected(ComponentName className) {
                mGls = null;
            }
        };

        bindService(GoogleLoginServiceConstants.SERVICE_INTENT,
                    mGlsConnection, Context.BIND_AUTO_CREATE);
    }

    private static class ClearThumbnails extends AsyncTask<File, Void, Void> {
        @Override
        public Void doInBackground(File... files) {
            if (files != null) {
                for (File f : files) {
                    if (!f.delete()) {
                      Log.e(LOGTAG, f.getPath() + " was not deleted");
                    }
                }
            }
            return null;
        }
    }

    /**
     * This layout holds everything you see below the status bar, including the
     * error console, the custom view container, and the webviews.
     */
    private FrameLayout mBrowserFrameLayout;

    @Override public void onCreate(Bundle icicle) {
        if (LOGV_ENABLED) {
            Log.v(LOGTAG, this + " onStart");
        }
        super.onCreate(icicle);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        // test the browser in OpenGL
        // requestWindowFeature(Window.FEATURE_OPENGL);

        setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);

        mResolver = getContentResolver();

        //
        // start MASF proxy service
        //
        //Intent proxyServiceIntent = new Intent();
        //proxyServiceIntent.setComponent
        //    (new ComponentName(
        //        "com.android.masfproxyservice",
        //        "com.android.masfproxyservice.MasfProxyService"));
        //startService(proxyServiceIntent, null);

        mSecLockIcon = Resources.getSystem().getDrawable(
                android.R.drawable.ic_secure);
        mMixLockIcon = Resources.getSystem().getDrawable(
                android.R.drawable.ic_partial_secure);

        FrameLayout frameLayout = (FrameLayout) getWindow().getDecorView()
                .findViewById(com.android.internal.R.id.content);
        mBrowserFrameLayout = (FrameLayout) LayoutInflater.from(this)
                .inflate(R.layout.custom_screen, null);
        mContentView = (FrameLayout) mBrowserFrameLayout.findViewById(
                R.id.main_content);
        mErrorConsoleContainer = (LinearLayout) mBrowserFrameLayout
                .findViewById(R.id.error_console);
        mCustomViewContainer = (FrameLayout) mBrowserFrameLayout
                .findViewById(R.id.fullscreen_custom_content);
        frameLayout.addView(mBrowserFrameLayout, COVER_SCREEN_PARAMS);
        mTitleBar = new TitleBarSet(this);

        // Create the tab control and our initial tab
        mTabControl = new TabControl(this);

        // Open the icon database and retain all the bookmark urls for favicons
        retainIconsOnStartup();

        // Keep a settings instance handy.
        mSettings = BrowserSettings.getInstance();
        mSettings.setTabControl(mTabControl);
        mSettings.loadFromDb(this);

        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Browser");

        /* enables registration for changes in network status from
           http stack */
        mNetworkStateChangedFilter = new IntentFilter();
        mNetworkStateChangedFilter.addAction(
                ConnectivityManager.CONNECTIVITY_ACTION);
        mNetworkStateIntentReceiver = new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    if (intent.getAction().equals(
                            ConnectivityManager.CONNECTIVITY_ACTION)) {
                        boolean down = intent.getBooleanExtra(
                                ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
                        onNetworkToggle(!down);
                    }
                }
            };

        IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
        filter.addDataScheme("package");
        mPackageInstallationReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                final String action = intent.getAction();
                final String packageName = intent.getData()
                        .getSchemeSpecificPart();
                final boolean replacing = intent.getBooleanExtra(
                        Intent.EXTRA_REPLACING, false);
                if (Intent.ACTION_PACKAGE_REMOVED.equals(action) && replacing) {
                    // if it is replacing, refreshPlugins() when adding
                    return;
                }
                PackageManager pm = BrowserActivity.this.getPackageManager();
                PackageInfo pkgInfo = null;
                try {
                    pkgInfo = pm.getPackageInfo(packageName,
                            PackageManager.GET_PERMISSIONS);
                } catch (PackageManager.NameNotFoundException e) {
                    return;
                }
                if (pkgInfo != null) {
                    String permissions[] = pkgInfo.requestedPermissions;
                    if (permissions == null) {
                        return;
                    }
                    boolean permissionOk = false;
                    for (String permit : permissions) {
                        if (PluginManager.PLUGIN_PERMISSION.equals(permit)) {
                            permissionOk = true;
                            break;
                        }
                    }
                    if (permissionOk) {
                        PluginManager.getInstance(BrowserActivity.this)
                                .refreshPlugins(
                                        Intent.ACTION_PACKAGE_ADDED
                                                .equals(action));
                    }
                }
            }
        };
        registerReceiver(mPackageInstallationReceiver, filter);

        // If this was a web search request, pass it on to the default web search provider.
        if (handleWebSearchIntent(getIntent())) {
            moveTaskToBack(true);
            return;
        }

        if (!mTabControl.restoreState(icicle)) {
            // clear up the thumbnail directory if we can't restore the state as
            // none of the files in the directory are referenced any more.
            new ClearThumbnails().execute(
                    mTabControl.getThumbnailDir().listFiles());
            // there is no quit on Android. But if we can't restore the state,
            // we can treat it as a new Browser, remove the old session cookies.
            CookieManager.getInstance().removeSessionCookie();
            final Intent intent = getIntent();
            final Bundle extra = intent.getExtras();
            // Create an initial tab.
            // If the intent is ACTION_VIEW and data is not null, the Browser is
            // invoked to view the content by another application. In this case,
            // the tab will be close when exit.
            UrlData urlData = getUrlDataFromIntent(intent);

            final TabControl.Tab t = mTabControl.createNewTab(
                    Intent.ACTION_VIEW.equals(intent.getAction()) &&
                    intent.getData() != null,
                    intent.getStringExtra(Browser.EXTRA_APPLICATION_ID), urlData.mUrl);
            mTabControl.setCurrentTab(t);
            attachTabToContentView(t);
            WebView webView = t.getWebView();
            if (extra != null) {
                int scale = extra.getInt(Browser.INITIAL_ZOOM_LEVEL, 0);
                if (scale > 0 && scale <= 1000) {
                    webView.setInitialScale(scale);
                }
            }
            // If we are not restoring from an icicle, then there is a high
            // likely hood this is the first run. So, check to see if the
            // homepage needs to be configured and copy any plugins from our
            // asset directory to the data partition.
            if ((extra == null || !extra.getBoolean("testing"))
                    && !mSettings.isLoginInitialized()) {
                setupHomePage();
            }

            if (urlData.isEmpty()) {
                if (mSettings.isLoginInitialized()) {
                    webView.loadUrl(mSettings.getHomePage());
                } else {
                    waitForCredentials();
                }
            } else {
                if (extra != null) {
                    urlData.setPostData(extra
                            .getByteArray(Browser.EXTRA_POST_DATA));
                }
                urlData.loadIn(webView);
            }
        } else {
            // TabControl.restoreState() will create a new tab even if
            // restoring the state fails.
            attachTabToContentView(mTabControl.getCurrentTab());
        }

        mTitleBar.init(this);
        // Create title bars for all of the tabs that have been created
        for (int i = 0; i < mTabControl.getTabCount(); i ++) {
            WebView view = mTabControl.getTab(i).getWebView();
            mTitleBar.addTab(view, false);
        }

        mTitleBar.setCurrentTab(mTabControl.getCurrentIndex());

        // Read JavaScript flags if it exists.
        String jsFlags = mSettings.getJsFlags();
        if (jsFlags.trim().length() != 0) {
            mTabControl.getCurrentWebView().setJsFlags(jsFlags);
        }
    }

    @Override
    protected void onNewIntent(Intent intent) {
        TabControl.Tab current = mTabControl.getCurrentTab();
        // When a tab is closed on exit, the current tab index is set to -1.
        // Reset before proceed as Browser requires the current tab to be set.
        if (current == null) {
            // Try to reset the tab in case the index was incorrect.
            current = mTabControl.getTab(0);
            if (current == null) {
                // No tabs at all so just ignore this intent.
                return;
            }
            mTabControl.setCurrentTab(current);
            mTitleBar.setCurrentTab(mTabControl.getTabIndex(current));
            attachTabToContentView(current);
            resetTitleAndIcon(current.getWebView());
        }
        final String action = intent.getAction();
        final int flags = intent.getFlags();
        if (Intent.ACTION_MAIN.equals(action) ||
                (flags & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) != 0) {
            // just resume the browser
            return;
        }
        if (Intent.ACTION_VIEW.equals(action)
                || Intent.ACTION_SEARCH.equals(action)
                || MediaStore.INTENT_ACTION_MEDIA_SEARCH.equals(action)
                || Intent.ACTION_WEB_SEARCH.equals(action)) {
            // If this was a search request (e.g. search query directly typed into the address bar),
            // pass it on to the default web search provider.
            if (handleWebSearchIntent(intent)) {
                return;
            }

            UrlData urlData = getUrlDataFromIntent(intent);
            if (urlData.isEmpty()) {
                urlData = new UrlData(mSettings.getHomePage());
            }
            urlData.setPostData(intent
                    .getByteArrayExtra(Browser.EXTRA_POST_DATA));

            final String appId = intent
                    .getStringExtra(Browser.EXTRA_APPLICATION_ID);
            if (Intent.ACTION_VIEW.equals(action)
                    && !getPackageName().equals(appId)
                    && (flags & Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT) != 0) {
                TabControl.Tab appTab = mTabControl.getTabFromId(appId);
                if (appTab != null) {
                    Log.i(LOGTAG, "Reusing tab for " + appId);
                    // Dismiss the subwindow if applicable.
                    dismissSubWindow(appTab);
                    // Since we might kill the WebView, remove it from the
                    // content view first.
                    removeTabFromContentView(appTab);
                    // Recreate the main WebView after destroying the old one.
                    // If the WebView has the same original url and is on that
                    // page, it can be reused.
                    boolean needsLoad =
                            mTabControl.recreateWebView(appTab, urlData.mUrl);

                    if (current != appTab) {
                        switchToTab(mTabControl.getTabIndex(appTab));
                        if (needsLoad) {
                            urlData.loadIn(appTab.getWebView());
                        }
                    } else {
                        // If the tab was the current tab, we have to attach
                        // it to the view system again.
                        attachTabToContentView(appTab);
                        if (needsLoad) {
                            urlData.loadIn(appTab.getWebView());
                        }
                    }
                    return;
                } else {
                    // No matching application tab, try to find a regular tab
                    // with a matching url.
                    appTab = mTabControl.findUnusedTabWithUrl(urlData.mUrl);
                    if (appTab != null) {
                        if (current != appTab) {
                            switchToTab(mTabControl.getTabIndex(appTab));
                        }
                        // Otherwise, we are already viewing the correct tab.
                    } else {
                        // if FLAG_ACTIVITY_BROUGHT_TO_FRONT flag is on, the url
                        // will be opened in a new tab unless we have reached
                        // MAX_TABS. Then the url will be opened in the current
                        // tab. If a new tab is created, it will have "true" for
                        // exit on close.
                        openTabAndShow(urlData, true, appId);
                    }
                }
            } else {
                if ("about:debug".equals(urlData.mUrl)) {
                    mSettings.toggleDebugSettings();
                    return;
                }
                // Get rid of the subwindow if it exists
                dismissSubWindow(current);
                urlData.loadIn(current.getWebView());
            }
        }
    }

    private int parseUrlShortcut(String url) {
        if (url == null) return SHORTCUT_INVALID;

        // FIXME: quick search, need to be customized by setting
        if (url.length() > 2 && url.charAt(1) == ' ') {
            switch (url.charAt(0)) {
            case 'g': return SHORTCUT_GOOGLE_SEARCH;
            case 'w': return SHORTCUT_WIKIPEDIA_SEARCH;
            case 'd': return SHORTCUT_DICTIONARY_SEARCH;
            case 'l': return SHORTCUT_GOOGLE_MOBILE_LOCAL_SEARCH;
            }
        }
        return SHORTCUT_INVALID;
    }

    /**
     * Launches the default web search activity with the query parameters if the given intent's data
     * are identified as plain search terms and not URLs/shortcuts.
     * @return true if the intent was handled and web search activity was launched, false if not.
     */
    private boolean handleWebSearchIntent(Intent intent) {
        if (intent == null) return false;

        String url = null;
        final String action = intent.getAction();
        if (Intent.ACTION_VIEW.equals(action)) {
            url = intent.getData().toString();
        } else if (Intent.ACTION_SEARCH.equals(action)
                || MediaStore.INTENT_ACTION_MEDIA_SEARCH.equals(action)
                || Intent.ACTION_WEB_SEARCH.equals(action)) {
            url = intent.getStringExtra(SearchManager.QUERY);
        }
        return handleWebSearchRequest(url, intent.getBundleExtra(SearchManager.APP_DATA));
    }

    /**
     * Launches the default web search activity with the query parameters if the given url string
     * was identified as plain search terms and not URL/shortcut.
     * @return true if the request was handled and web search activity was launched, false if not.
     */
    private boolean handleWebSearchRequest(String inUrl, Bundle appData) {
        if (inUrl == null) return false;

        // In general, we shouldn't modify URL from Intent.
        // But currently, we get the user-typed URL from search box as well.
        String url = fixUrl(inUrl).trim();

        // URLs and site specific search shortcuts are handled by the regular flow of control, so
        // return early.
        if (Regex.WEB_URL_PATTERN.matcher(url).matches()
                || ACCEPTED_URI_SCHEMA.matcher(url).matches()
                || parseUrlShortcut(url) != SHORTCUT_INVALID) {
            return false;
        }

        Browser.updateVisitedHistory(mResolver, url, false);
        Browser.addSearchUrl(mResolver, url);

        Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
        intent.addCategory(Intent.CATEGORY_DEFAULT);
        intent.putExtra(SearchManager.QUERY, url);
        if (appData != null) {
            intent.putExtra(SearchManager.APP_DATA, appData);
        }
        intent.putExtra(Browser.EXTRA_APPLICATION_ID, getPackageName());
        startActivity(intent);

        return true;
    }

    private UrlData getUrlDataFromIntent(Intent intent) {
        String url = null;
        if (intent != null) {
            final String action = intent.getAction();
            if (Intent.ACTION_VIEW.equals(action)) {
                url = smartUrlFilter(intent.getData());
                if (url != null && url.startsWith("content:")) {
                    /* Append mimetype so webview knows how to display */
                    String mimeType = intent.resolveType(getContentResolver());
                    if (mimeType != null) {
                        url += "?" + mimeType;
                    }
                }
                if ("inline:".equals(url)) {
                    return new InlinedUrlData(
                            intent.getStringExtra(Browser.EXTRA_INLINE_CONTENT),
                            intent.getType(),
                            intent.getStringExtra(Browser.EXTRA_INLINE_ENCODING),
                            intent.getStringExtra(Browser.EXTRA_INLINE_FAILURL));
                }
            } else if (Intent.ACTION_SEARCH.equals(action)
                    || MediaStore.INTENT_ACTION_MEDIA_SEARCH.equals(action)
                    || Intent.ACTION_WEB_SEARCH.equals(action)) {
                url = intent.getStringExtra(SearchManager.QUERY);
                if (url != null) {
                    mLastEnteredUrl = url;
                    // Don't add Urls, just search terms.
                    // Urls will get added when the page is loaded.
                    if (!Regex.WEB_URL_PATTERN.matcher(url).matches()) {
                        Browser.updateVisitedHistory(mResolver, url, false);
                    }
                    // In general, we shouldn't modify URL from Intent.
                    // But currently, we get the user-typed URL from search box as well.
                    url = fixUrl(url);
                    url = smartUrlFilter(url);
                    String searchSource = "&source=android-" + GOOGLE_SEARCH_SOURCE_SUGGEST + "&";
                    if (url.contains(searchSource)) {
                        String source = null;
                        final Bundle appData = intent.getBundleExtra(SearchManager.APP_DATA);
                        if (appData != null) {
                            source = appData.getString(SearchManager.SOURCE);
                        }
                        if (TextUtils.isEmpty(source)) {
                            source = GOOGLE_SEARCH_SOURCE_UNKNOWN;
                        }
                        url = url.replace(searchSource, "&source=android-"+source+"&");
                    }
                }
            }
        }
        return new UrlData(url);
    }

    /* package */ static String fixUrl(String inUrl) {
        // FIXME: Converting the url to lower case
        // duplicates functionality in smartUrlFilter().
        // However, changing all current callers of fixUrl to
        // call smartUrlFilter in addition may have unwanted
        // consequences, and is deferred for now.
        int colon = inUrl.indexOf(':');
        boolean allLower = true;
        for (int index = 0; index < colon; index++) {
            char ch = inUrl.charAt(index);
            if (!Character.isLetter(ch)) {
                break;
            }
            allLower &= Character.isLowerCase(ch);
            if (index == colon - 1 && !allLower) {
                inUrl = inUrl.substring(0, colon).toLowerCase()
                        + inUrl.substring(colon);
            }
        }
        if (inUrl.startsWith("http://") || inUrl.startsWith("https://"))
            return inUrl;
        if (inUrl.startsWith("http:") ||
                inUrl.startsWith("https:")) {
            if (inUrl.startsWith("http:/") || inUrl.startsWith("https:/")) {
                inUrl = inUrl.replaceFirst("/", "//");
            } else inUrl = inUrl.replaceFirst(":", "://");
        }
        return inUrl;
    }

    /**
     * Looking for the pattern like this
     *
     *          *
     *         * *
     *      ***   *     *******
     *             *   *
     *              * *
     *               *
     */
    private final SensorListener mSensorListener = new SensorListener() {
        private long mLastGestureTime;
        private float[] mPrev = new float[3];
        private float[] mPrevDiff = new float[3];
        private float[] mDiff = new float[3];
        private float[] mRevertDiff = new float[3];

        public void onSensorChanged(int sensor, float[] values) {
            boolean show = false;
            float[] diff = new float[3];

            for (int i = 0; i < 3; i++) {
                diff[i] = values[i] - mPrev[i];
                if (Math.abs(diff[i]) > 1) {
                    show = true;
                }
                if ((diff[i] > 1.0 && mDiff[i] < 0.2)
                        || (diff[i] < -1.0 && mDiff[i] > -0.2)) {
                    // start track when there is a big move, or revert
                    mRevertDiff[i] = mDiff[i];
                    mDiff[i] = 0;
                } else if (diff[i] > -0.2 && diff[i] < 0.2) {
                    // reset when it is flat
                    mDiff[i] = mRevertDiff[i]  = 0;
                }
                mDiff[i] += diff[i];
                mPrevDiff[i] = diff[i];
                mPrev[i] = values[i];
            }

            if (false) {
                // only shows if we think the delta is big enough, in an attempt
                // to detect "serious" moves left/right or up/down
                Log.d("BrowserSensorHack", "sensorChanged " + sensor + " ("
                        + values[0] + ", " + values[1] + ", " + values[2] + ")"
                        + " diff(" + diff[0] + " " + diff[1] + " " + diff[2]
                        + ")");
                Log.d("BrowserSensorHack", "      mDiff(" + mDiff[0] + " "
                        + mDiff[1] + " " + mDiff[2] + ")" + " mRevertDiff("
                        + mRevertDiff[0] + " " + mRevertDiff[1] + " "
                        + mRevertDiff[2] + ")");
            }

            long now = android.os.SystemClock.uptimeMillis();
            if (now - mLastGestureTime > 1000) {
                mLastGestureTime = 0;

                float y = mDiff[1];
                float z = mDiff[2];
                float ay = Math.abs(y);
                float az = Math.abs(z);
                float ry = mRevertDiff[1];
                float rz = mRevertDiff[2];
                float ary = Math.abs(ry);
                float arz = Math.abs(rz);
                boolean gestY = ay > 2.5f && ary > 1.0f && ay > ary;
                boolean gestZ = az > 3.5f && arz > 1.0f && az > arz;

                if ((gestY || gestZ) && !(gestY && gestZ)) {
                    WebView view = mTabControl.getCurrentWebView();

                    if (view != null) {
                        if (gestZ) {
                            if (z < 0) {
                                view.zoomOut();
                            } else {
                                view.zoomIn();
                            }
                        } else {
                            view.flingScroll(0, Math.round(y * 100));
                        }
                    }
                    mLastGestureTime = now;
                }
            }
        }

        public void onAccuracyChanged(int sensor, int accuracy) {
            // TODO Auto-generated method stub

        }
    };

    @Override protected void onResume() {
        super.onResume();
        if (LOGV_ENABLED) {
            Log.v(LOGTAG, "BrowserActivity.onResume: this=" + this);
        }

        if (!mActivityInPause) {
            Log.e(LOGTAG, "BrowserActivity is already resumed.");
            return;
        }

        mTabControl.resumeCurrentTab();
        mActivityInPause = false;
        resumeWebViewTimers();

        if (mWakeLock.isHeld()) {
            mHandler.removeMessages(RELEASE_WAKELOCK);
            mWakeLock.release();
        }

        if (mCredsDlg != null) {
            if (!mHandler.hasMessages(CANCEL_CREDS_REQUEST)) {
             // In case credential request never comes back
                mHandler.sendEmptyMessageDelayed(CANCEL_CREDS_REQUEST, 6000);
            }
        }

        registerReceiver(mNetworkStateIntentReceiver,
                         mNetworkStateChangedFilter);
        WebView.enablePlatformNotifications();

        if (mSettings.doFlick()) {
            if (mSensorManager == null) {
                mSensorManager = (SensorManager) getSystemService(
                        Context.SENSOR_SERVICE);
            }
            mSensorManager.registerListener(mSensorListener,
                    SensorManager.SENSOR_ACCELEROMETER,
                    SensorManager.SENSOR_DELAY_FASTEST);
        } else {
            mSensorManager = null;
        }
    }

    /**
     * Since the actual title bar is embedded in the WebView, and removing it
     * would change its appearance, create a temporary title bar to go at
     * the top of the screen while the menu is open.
     */
    private TitleBar mFakeTitleBar;

    /**
     * Keeps track of whether the options menu is open.  This is important in
     * determining whether to show or hide the title bar overlay.
     */
    private boolean mOptionsMenuOpen;

    /**
     * Only meaningful when mOptionsMenuOpen is true.  This variable keeps track
     * of whether the configuration has changed.  The first onMenuOpened call
     * after a configuration change is simply a reopening of the same menu
     * (i.e. mIconView did not change).
     */
    private boolean mConfigChanged;

    /**
     * Whether or not the options menu is in its smaller, icon menu form.  When
     * true, we want the title bar overlay to be up.  When false, we do not.
     * Only meaningful if mOptionsMenuOpen is true.
     */
    private boolean mIconView;

    @Override
    public boolean onMenuOpened(int featureId, Menu menu) {
        if (Window.FEATURE_OPTIONS_PANEL == featureId) {
            if (mOptionsMenuOpen) {
                if (mConfigChanged) {
                    // We do not need to make any changes to the state of the
                    // title bar, since the only thing that happened was a
                    // change in orientation
                    mConfigChanged = false;
                } else {
                    if (mIconView) {
                        // Switching the menu to expanded view, so hide the
                        // title bar.
                        hideFakeTitleBar();
                        mIconView = false;
                    } else {
                        // Switching the menu back to icon view, so show the
                        // title bar once again.
                        showFakeTitleBar();
                        mIconView = true;
                    }
                }
            } else {
                // The options menu is closed, so open it, and show the title
                showFakeTitleBar();
                mOptionsMenuOpen = true;
                mConfigChanged = false;
                mIconView = true;
            }
        }
        return true;
    }

    private void showFakeTitleBar() {
        if (mFakeTitleBar == null) {
            final WebView webView = getTopWindow();
            mFakeTitleBar = new TitleBar(this, webView);
            mFakeTitleBar.setTitleAndUrl(null, webView.getUrl());
            mFakeTitleBar.setProgress(webView.getProgress());
            mFakeTitleBar.setFavicon(webView.getFavicon());
            updateLockIconToLatest();
            final View title = mFakeTitleBar.findViewById(R.id.title);
            mFakeTitleBar.setOnTouchListener(new View.OnTouchListener() {
                    public boolean onTouch(View v, MotionEvent event) {
                        if (event.getAction() == MotionEvent.ACTION_UP) {
                            if (event.getX() > title.getRight()) {
                                if (webView != null
                                        && webView.getProgress() < 100) {
                                    if (webView != null) {
                                        webView.stopLoading();
                                    }
                                } else {
                                    bookmarksOrHistoryPicker(false);
                                }
                            } else {
                                onSearchRequested();
                            }
                            closeOptionsMenu();
                        }
                        return true;
                    }
            });

            WindowManager manager
                    = (WindowManager) getSystemService(Context.WINDOW_SERVICE);

            // Add the title bar to the window manager so it can receive touches
            // while the menu is up
            WindowManager.LayoutParams params
                    = new WindowManager.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_APPLICATION_SUB_PANEL,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.OPAQUE);
            params.gravity = Gravity.TOP;
            WebView mainView = mTabControl.getCurrentWebView();
            params.windowAnimations = mainView == null
                    || mainView.getScrollY() != 0
                    ? com.android.internal.R.style.Animation_DropDownDown : 0;
            // XXX : Without providing an offset, the fake title bar will be
            // placed underneath the status bar.  Use the global visible rect
            // of mBrowserFrameLayout to determine the bottom of the status bar
            Rect rectangle = new Rect();
            mBrowserFrameLayout.getGlobalVisibleRect(rectangle);
            params.y = rectangle.top;
            manager.addView(mFakeTitleBar, params);
        }
    }

    @Override
    public void onOptionsMenuClosed(Menu menu) {
        mOptionsMenuOpen = false;
        if (!mInLoad) {
            hideFakeTitleBar();
        } else if (!mIconView) {
            // The page is currently loading, and we are in expanded mode, so
            // we were not showing the menu.  Show it once again.  It will be
            // removed when the page finishes.
            showFakeTitleBar();
        }
    }
    private void hideFakeTitleBar() {
        if (mFakeTitleBar == null) return;
        WindowManager manager
                    = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        manager.removeView(mFakeTitleBar);
        mFakeTitleBar = null;
    }

    /**
     *  onSaveInstanceState(Bundle map)
     *  onSaveInstanceState is called right before onStop(). The map contains
     *  the saved state.
     */
    @Override protected void onSaveInstanceState(Bundle outState) {
        if (LOGV_ENABLED) {
            Log.v(LOGTAG, "BrowserActivity.onSaveInstanceState: this=" + this);
        }
        // the default implementation requires each view to have an id. As the
        // browser handles the state itself and it doesn't use id for the views,
        // don't call the default implementation. Otherwise it will trigger the
        // warning like this, "couldn't save which view has focus because the
        // focused view XXX has no id".

        // Save all the tabs
        mTabControl.saveState(outState);
    }

    @Override protected void onPause() {
        super.onPause();

        if (mActivityInPause) {
            Log.e(LOGTAG, "BrowserActivity is already paused.");
            return;
        }

        mTabControl.pauseCurrentTab();
        mActivityInPause = true;
        if (mTabControl.getCurrentIndex() >= 0 && !pauseWebViewTimers()) {
            mWakeLock.acquire();
            mHandler.sendMessageDelayed(mHandler
                    .obtainMessage(RELEASE_WAKELOCK), WAKELOCK_TIMEOUT);
        }

        // Clear the credentials toast if it is up
        if (mCredsDlg != null && mCredsDlg.isShowing()) {
            mCredsDlg.dismiss();
        }
        mCredsDlg = null;

        // FIXME: This removes the active tabs page and resets the menu to
        // MAIN_MENU.  A better solution might be to do this work in onNewIntent
        // but then we would need to save it in onSaveInstanceState and restore
        // it in onCreate/onRestoreInstanceState
        if (mActiveTabsPage != null) {
            removeActiveTabPage(true);
        }

        cancelStopToast();

        // unregister network state listener
        unregisterReceiver(mNetworkStateIntentReceiver);
        WebView.disablePlatformNotifications();

        if (mSensorManager != null) {
            mSensorManager.unregisterListener(mSensorListener);
        }
    }

    @Override protected void onDestroy() {
        if (LOGV_ENABLED) {
            Log.v(LOGTAG, "BrowserActivity.onDestroy: this=" + this);
        }
        super.onDestroy();
        // Remove the current tab and sub window
        TabControl.Tab t = mTabControl.getCurrentTab();
        if (t != null) {
            dismissSubWindow(t);
            removeTabFromContentView(t);
        }
        // Destroy all the tabs
        mTabControl.destroy();
        WebIconDatabase.getInstance().close();
        if (mGlsConnection != null) {
            unbindService(mGlsConnection);
            mGlsConnection = null;
        }

        //
        // stop MASF proxy service
        //
        //Intent proxyServiceIntent = new Intent();
        //proxyServiceIntent.setComponent
        //   (new ComponentName(
        //        "com.android.masfproxyservice",
        //        "com.android.masfproxyservice.MasfProxyService"));
        //stopService(proxyServiceIntent);

        unregisterReceiver(mPackageInstallationReceiver);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        mConfigChanged = true;
        super.onConfigurationChanged(newConfig);

        if (mPageInfoDialog != null) {
            mPageInfoDialog.dismiss();
            showPageInfo(
                mPageInfoView,
                mPageInfoFromShowSSLCertificateOnError.booleanValue());
        }
        if (mSSLCertificateDialog != null) {
            mSSLCertificateDialog.dismiss();
            showSSLCertificate(
                mSSLCertificateView);
        }
        if (mSSLCertificateOnErrorDialog != null) {
            mSSLCertificateOnErrorDialog.dismiss();
            showSSLCertificateOnError(
                mSSLCertificateOnErrorView,
                mSSLCertificateOnErrorHandler,
                mSSLCertificateOnErrorError);
        }
        if (mHttpAuthenticationDialog != null) {
            String title = ((TextView) mHttpAuthenticationDialog
                    .findViewById(com.android.internal.R.id.alertTitle)).getText()
                    .toString();
            String name = ((TextView) mHttpAuthenticationDialog
                    .findViewById(R.id.username_edit)).getText().toString();
            String password = ((TextView) mHttpAuthenticationDialog
                    .findViewById(R.id.password_edit)).getText().toString();
            int focusId = mHttpAuthenticationDialog.getCurrentFocus()
                    .getId();
            mHttpAuthenticationDialog.dismiss();
            showHttpAuthentication(mHttpAuthHandler, null, null, title,
                    name, password, focusId);
        }
        if (mFindDialog != null && mFindDialog.isShowing()) {
            mFindDialog.onConfigurationChanged(newConfig);
        }
    }

    @Override public void onLowMemory() {
        super.onLowMemory();
        mTabControl.freeMemory();
    }

    private boolean resumeWebViewTimers() {
        if ((!mActivityInPause && !mPageStarted) ||
                (mActivityInPause && mPageStarted)) {
            CookieSyncManager.getInstance().startSync();
            WebView w = mTabControl.getCurrentWebView();
            if (w != null) {
                w.resumeTimers();
            }
            return true;
        } else {
            return false;
        }
    }

    private boolean pauseWebViewTimers() {
        if (mActivityInPause && !mPageStarted) {
            CookieSyncManager.getInstance().stopSync();
            WebView w = mTabControl.getCurrentWebView();
            if (w != null) {
                w.pauseTimers();
            }
            return true;
        } else {
            return false;
        }
    }

    // FIXME: Do we want to call this when loading google for the first time?
    /*
     * This function is called when we are launching for the first time. We
     * are waiting for the login credentials before loading Google home
     * pages. This way the user will be logged in straight away.
     */
    private void waitForCredentials() {
        // Show a toast
        mCredsDlg = new ProgressDialog(this);
        mCredsDlg.setIndeterminate(true);
        mCredsDlg.setMessage(getText(R.string.retrieving_creds_dlg_msg));
        // If the user cancels the operation, then cancel the Google
        // Credentials request.
        mCredsDlg.setCancelMessage(mHandler.obtainMessage(CANCEL_CREDS_REQUEST));
        mCredsDlg.show();

        // We set a timeout for the retrieval of credentials in onResume()
        // as that is when we have freed up some CPU time to get
        // the login credentials.
    }

    /*
     * If we have received the credentials or we have timed out and we are
     * showing the credentials dialog, then it is time to move on.
     */
    private void resumeAfterCredentials() {
        if (mCredsDlg == null) {
            return;
        }

        // Clear the toast
        if (mCredsDlg.isShowing()) {
            mCredsDlg.dismiss();
        }
        mCredsDlg = null;

        // Clear any pending timeout
        mHandler.removeMessages(CANCEL_CREDS_REQUEST);

        // Load the page
        WebView w = mTabControl.getCurrentWebView();
        if (w != null) {
            w.loadUrl(mSettings.getHomePage());
        }

        // Update the settings, need to do this last as it can take a moment
        // to persist the settings. In the mean time we could be loading
        // content.
        mSettings.setLoginInitialized(this);
    }

    // Open the icon database and retain all the icons for visited sites.
    private void retainIconsOnStartup() {
        final WebIconDatabase db = WebIconDatabase.getInstance();
        db.open(getDir("icons", 0).getPath());
        try {
            Cursor c = Browser.getAllBookmarks(mResolver);
            if (!c.moveToFirst()) {
                c.deactivate();
                return;
            }
            int urlIndex = c.getColumnIndex(Browser.BookmarkColumns.URL);
            do {
                String url = c.getString(urlIndex);
                db.retainIconForPageUrl(url);
            } while (c.moveToNext());
            c.deactivate();
        } catch (IllegalStateException e) {
            Log.e(LOGTAG, "retainIconsOnStartup", e);
        }
    }

    // Helper method for getting the top window.
    WebView getTopWindow() {
        return mTabControl.getCurrentTopWebView();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.browser, menu);
        mMenu = menu;
        updateInLoadMenuItems();
        return true;
    }

    /**
     * As the menu can be open when loading state changes
     * we must manually update the state of the stop/reload menu
     * item
     */
    private void updateInLoadMenuItems() {
        if (mMenu == null) {
            return;
        }
        MenuItem src = mInLoad ?
                mMenu.findItem(R.id.stop_menu_id):
                    mMenu.findItem(R.id.reload_menu_id);
        MenuItem dest = mMenu.findItem(R.id.stop_reload_menu_id);
        dest.setIcon(src.getIcon());
        dest.setTitle(src.getTitle());
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        // chording is not an issue with context menus, but we use the same
        // options selector, so set mCanChord to true so we can access them.
        mCanChord = true;
        int id = item.getItemId();
        final WebView webView = getTopWindow();
        if (null == webView) {
            return false;
        }
        final HashMap hrefMap = new HashMap();
        hrefMap.put("webview", webView);
        final Message msg = mHandler.obtainMessage(
                FOCUS_NODE_HREF, id, 0, hrefMap);
        switch (id) {
            // -- Browser context menu
            case R.id.open_context_menu_id:
            case R.id.open_newtab_context_menu_id:
            case R.id.bookmark_context_menu_id:
            case R.id.save_link_context_menu_id:
            case R.id.share_link_context_menu_id:
            case R.id.copy_link_context_menu_id:
                webView.requestFocusNodeHref(msg);
                break;

            default:
                // For other context menus
                return onOptionsItemSelected(item);
        }
        mCanChord = false;
        return true;
    }

    private Bundle createGoogleSearchSourceBundle(String source) {
        Bundle bundle = new Bundle();
        bundle.putString(SearchManager.SOURCE, source);
        return bundle;
    }

    /**
     * Overriding this to insert a local information bundle
     */
    @Override
    public boolean onSearchRequested() {
        String url = (getTopWindow() == null) ? null : getTopWindow().getUrl();
        startSearch(mSettings.getHomePage().equals(url) ? null : url, true,
                createGoogleSearchSourceBundle(GOOGLE_SEARCH_SOURCE_SEARCHKEY), false);
        return true;
    }

    @Override
    public void startSearch(String initialQuery, boolean selectInitialQuery,
            Bundle appSearchData, boolean globalSearch) {
        if (appSearchData == null) {
            appSearchData = createGoogleSearchSourceBundle(GOOGLE_SEARCH_SOURCE_TYPE);
        }
        super.startSearch(initialQuery, selectInitialQuery, appSearchData, globalSearch);
    }

    /**
     * Switch tabs.  Called by the TitleBarSet when sliding the title bar
     * results in changing tabs.
     * @param index Index of the tab to change to, as defined by
     *              mTabControl.getTabIndex(Tab t).
     * @return boolean True if we successfully switched to a different tab.  If
     *                 the indexth tab is null, or if that tab is the same as
     *                 the current one, return false.
     */
    /* package */ boolean switchToTab(int index) {
        TabControl.Tab tab = mTabControl.getTab(index);
        TabControl.Tab currentTab = mTabControl.getCurrentTab();
        if (tab == null || tab == currentTab) {
            return false;
        }
        if (currentTab != null) {
            // currentTab may be null if it was just removed.  In that case,
            // we do not need to remove it
            removeTabFromContentView(currentTab);
        }
        removeTabFromContentView(tab);
        mTabControl.setCurrentTab(tab);
        attachTabToContentView(tab);
        mTitleBar.setCurrentTab(index);
        return true;
    }

    /* package */ TabControl.Tab openTabToHomePage() {
        return openTabAndShow(mSettings.getHomePage(), false, null);
    }

    /* package */ void closeCurrentWindow() {
        final TabControl.Tab current = mTabControl.getCurrentTab();
        if (mTabControl.getTabCount() == 1) {
            // This is the last tab.  Open a new one, with the home
            // page and close the current one.
            TabControl.Tab newTab = openTabToHomePage();
            closeTab(current);
            return;
        }
        final TabControl.Tab parent = current.getParentTab();
        int indexToShow = -1;
        if (parent != null) {
            indexToShow = mTabControl.getTabIndex(parent);
        } else {
            final int currentIndex = mTabControl.getCurrentIndex();
            // Try to move to the tab to the right
            indexToShow = currentIndex + 1;
            if (indexToShow > mTabControl.getTabCount() - 1) {
                // Try to move to the tab to the left
                indexToShow = currentIndex - 1;
            }
        }
        if (switchToTab(indexToShow)) {
            // Close window
            closeTab(current);
        }
    }

    private ActiveTabsPage mActiveTabsPage;

    /**
     * Remove the active tabs page.
     * @param needToAttach If true, the active tabs page did not attach a tab
     *                     to the content view, so we need to do that here.
     */
    /* package */ void removeActiveTabPage(boolean needToAttach) {
        mContentView.removeView(mActiveTabsPage);
        mActiveTabsPage = null;
        mMenuState = R.id.MAIN_MENU;
        if (needToAttach) {
            attachTabToContentView(mTabControl.getCurrentTab());
        }
        getTopWindow().requestFocus();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (!mCanChord) {
            // The user has already fired a shortcut with this hold down of the
            // menu key.
            return false;
        }
        if (null == getTopWindow()) {
            return false;
        }
        if (mMenuIsDown) {
            // The shortcut action consumes the MENU. Even if it is still down,
            // it won't trigger the next shortcut action. In the case of the
            // shortcut action triggering a new activity, like Bookmarks, we
            // won't get onKeyUp for MENU. So it is important to reset it here.
            mMenuIsDown = false;
        }
        switch (item.getItemId()) {
            // -- Main menu
            case R.id.new_tab_menu_id:
                openTabToHomePage();
                break;

            case R.id.goto_menu_id:
                bookmarksOrHistoryPicker(false);
                break;

            case R.id.active_tabs_menu_id:
                mActiveTabsPage = new ActiveTabsPage(this, mTabControl);
                removeTabFromContentView(mTabControl.getCurrentTab());
                mContentView.addView(mActiveTabsPage, COVER_SCREEN_PARAMS);
                mActiveTabsPage.requestFocus();
                mMenuState = EMPTY_MENU;
                break;

            case R.id.add_bookmark_menu_id:
                Intent i = new Intent(BrowserActivity.this,
                        AddBookmarkPage.class);
                WebView w = getTopWindow();
                i.putExtra("url", w.getUrl());
                i.putExtra("title", w.getTitle());
                startActivity(i);
                break;

            case R.id.stop_reload_menu_id:
                if (mInLoad) {
                    stopLoading();
                } else {
                    getTopWindow().reload();
                }
                break;

            case R.id.back_menu_id:
                getTopWindow().goBack();
                break;

            case R.id.forward_menu_id:
                getTopWindow().goForward();
                break;

            case R.id.close_menu_id:
                // Close the subwindow if it exists.
                if (mTabControl.getCurrentSubWindow() != null) {
                    dismissSubWindow(mTabControl.getCurrentTab());
                    break;
                }
                closeCurrentWindow();
                break;

            case R.id.homepage_menu_id:
                TabControl.Tab current = mTabControl.getCurrentTab();
                if (current != null) {
                    dismissSubWindow(current);
                    current.getWebView().loadUrl(mSettings.getHomePage());
                }
                break;

            case R.id.preferences_menu_id:
                Intent intent = new Intent(this,
                        BrowserPreferencesPage.class);
                startActivityForResult(intent, PREFERENCES_PAGE);
                break;

            case R.id.find_menu_id:
                if (null == mFindDialog) {
                    mFindDialog = new FindDialog(this);
                }
                mFindDialog.setWebView(getTopWindow());
                mFindDialog.show();
                mMenuState = EMPTY_MENU;
                break;

            case R.id.select_text_id:
                getTopWindow().emulateShiftHeld();
                break;
            case R.id.page_info_menu_id:
                showPageInfo(mTabControl.getCurrentTab(), false);
                break;

            case R.id.classic_history_menu_id:
                bookmarksOrHistoryPicker(true);
                break;

            case R.id.share_page_menu_id:
                Browser.sendString(this, getTopWindow().getUrl());
                break;

            case R.id.dump_nav_menu_id:
                getTopWindow().debugDump();
                break;

            case R.id.zoom_in_menu_id:
                getTopWindow().zoomIn();
                break;

            case R.id.zoom_out_menu_id:
                getTopWindow().zoomOut();
                break;

            case R.id.view_downloads_menu_id:
                viewDownloads(null);
                break;

            case R.id.window_one_menu_id:
            case R.id.window_two_menu_id:
            case R.id.window_three_menu_id:
            case R.id.window_four_menu_id:
            case R.id.window_five_menu_id:
            case R.id.window_six_menu_id:
            case R.id.window_seven_menu_id:
            case R.id.window_eight_menu_id:
                {
                    int menuid = item.getItemId();
                    for (int id = 0; id < WINDOW_SHORTCUT_ID_ARRAY.length; id++) {
                        if (WINDOW_SHORTCUT_ID_ARRAY[id] == menuid) {
                            TabControl.Tab desiredTab = mTabControl.getTab(id);
                            if (desiredTab != null &&
                                    desiredTab != mTabControl.getCurrentTab()) {
                                switchToTab(id);
                            }
                            break;
                        }
                    }
                }
                break;

            default:
                if (!super.onOptionsItemSelected(item)) {
                    return false;
                }
                // Otherwise fall through.
        }
        mCanChord = false;
        return true;
    }

    public void closeFind() {
        mMenuState = R.id.MAIN_MENU;
    }

    @Override public boolean onPrepareOptionsMenu(Menu menu)
    {
        // This happens when the user begins to hold down the menu key, so
        // allow them to chord to get a shortcut.
        mCanChord = true;
        // Note: setVisible will decide whether an item is visible; while
        // setEnabled() will decide whether an item is enabled, which also means
        // whether the matching shortcut key will function.
        super.onPrepareOptionsMenu(menu);
        switch (mMenuState) {
            case EMPTY_MENU:
                if (mCurrentMenuState != mMenuState) {
                    menu.setGroupVisible(R.id.MAIN_MENU, false);
                    menu.setGroupEnabled(R.id.MAIN_MENU, false);
                    menu.setGroupEnabled(R.id.MAIN_SHORTCUT_MENU, false);
                }
                break;
            default:
                if (mCurrentMenuState != mMenuState) {
                    menu.setGroupVisible(R.id.MAIN_MENU, true);
                    menu.setGroupEnabled(R.id.MAIN_MENU, true);
                    menu.setGroupEnabled(R.id.MAIN_SHORTCUT_MENU, true);
                }
                final WebView w = getTopWindow();
                boolean canGoBack = false;
                boolean canGoForward = false;
                boolean isHome = false;
                if (w != null) {
                    canGoBack = w.canGoBack();
                    canGoForward = w.canGoForward();
                    isHome = mSettings.getHomePage().equals(w.getUrl());
                }
                final MenuItem back = menu.findItem(R.id.back_menu_id);
                back.setEnabled(canGoBack);

                final MenuItem home = menu.findItem(R.id.homepage_menu_id);
                home.setEnabled(!isHome);

                menu.findItem(R.id.forward_menu_id)
                        .setEnabled(canGoForward);

                menu.findItem(R.id.new_tab_menu_id).setEnabled(
                        mTabControl.getTabCount() < TabControl.MAX_TABS);

                // decide whether to show the share link option
                PackageManager pm = getPackageManager();
                Intent send = new Intent(Intent.ACTION_SEND);
                send.setType("text/plain");
                ResolveInfo ri = pm.resolveActivity(send, PackageManager.MATCH_DEFAULT_ONLY);
                menu.findItem(R.id.share_page_menu_id).setVisible(ri != null);

                boolean isNavDump = mSettings.isNavDump();
                final MenuItem nav = menu.findItem(R.id.dump_nav_menu_id);
                nav.setVisible(isNavDump);
                nav.setEnabled(isNavDump);
                break;
        }
        mCurrentMenuState = mMenuState;
        return true;
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        WebView webview = (WebView) v;
        WebView.HitTestResult result = webview.getHitTestResult();
        if (result == null) {
            return;
        }

        int type = result.getType();
        if (type == WebView.HitTestResult.UNKNOWN_TYPE) {
            Log.w(LOGTAG,
                    "We should not show context menu when nothing is touched");
            return;
        }
        if (type == WebView.HitTestResult.EDIT_TEXT_TYPE) {
            // let TextView handles context menu
            return;
        }

        // Note, http://b/issue?id=1106666 is requesting that
        // an inflated menu can be used again. This is not available
        // yet, so inflate each time (yuk!)
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.browsercontext, menu);

        // Show the correct menu group
        String extra = result.getExtra();
        menu.setGroupVisible(R.id.PHONE_MENU,
                type == WebView.HitTestResult.PHONE_TYPE);
        menu.setGroupVisible(R.id.EMAIL_MENU,
                type == WebView.HitTestResult.EMAIL_TYPE);
        menu.setGroupVisible(R.id.GEO_MENU,
                type == WebView.HitTestResult.GEO_TYPE);
        menu.setGroupVisible(R.id.IMAGE_MENU,
                type == WebView.HitTestResult.IMAGE_TYPE
                || type == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE);
        menu.setGroupVisible(R.id.ANCHOR_MENU,
                type == WebView.HitTestResult.SRC_ANCHOR_TYPE
                || type == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE);

        // Setup custom handling depending on the type
        switch (type) {
            case WebView.HitTestResult.PHONE_TYPE:
                menu.setHeaderTitle(Uri.decode(extra));
                menu.findItem(R.id.dial_context_menu_id).setIntent(
                        new Intent(Intent.ACTION_VIEW, Uri
                                .parse(WebView.SCHEME_TEL + extra)));
                Intent addIntent = new Intent(Intent.ACTION_INSERT_OR_EDIT);
                addIntent.putExtra(Insert.PHONE, Uri.decode(extra));
                addIntent.setType(Contacts.People.CONTENT_ITEM_TYPE);
                menu.findItem(R.id.add_contact_context_menu_id).setIntent(
                        addIntent);
                menu.findItem(R.id.copy_phone_context_menu_id).setOnMenuItemClickListener(
                        new Copy(extra));
                break;

            case WebView.HitTestResult.EMAIL_TYPE:
                menu.setHeaderTitle(extra);
                menu.findItem(R.id.email_context_menu_id).setIntent(
                        new Intent(Intent.ACTION_VIEW, Uri
                                .parse(WebView.SCHEME_MAILTO + extra)));
                menu.findItem(R.id.copy_mail_context_menu_id).setOnMenuItemClickListener(
                        new Copy(extra));
                break;

            case WebView.HitTestResult.GEO_TYPE:
                menu.setHeaderTitle(extra);
                menu.findItem(R.id.map_context_menu_id).setIntent(
                        new Intent(Intent.ACTION_VIEW, Uri
                                .parse(WebView.SCHEME_GEO
                                        + URLEncoder.encode(extra))));
                menu.findItem(R.id.copy_geo_context_menu_id).setOnMenuItemClickListener(
                        new Copy(extra));
                break;

            case WebView.HitTestResult.SRC_ANCHOR_TYPE:
            case WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE:
                TextView titleView = (TextView) LayoutInflater.from(this)
                        .inflate(android.R.layout.browser_link_context_header,
                        null);
                titleView.setText(extra);
                menu.setHeaderView(titleView);
                // decide whether to show the open link in new tab option
                menu.findItem(R.id.open_newtab_context_menu_id).setVisible(
                        mTabControl.getTabCount() < TabControl.MAX_TABS);
                PackageManager pm = getPackageManager();
                Intent send = new Intent(Intent.ACTION_SEND);
                send.setType("text/plain");
                ResolveInfo ri = pm.resolveActivity(send, PackageManager.MATCH_DEFAULT_ONLY);
                menu.findItem(R.id.share_link_context_menu_id).setVisible(ri != null);
                if (type == WebView.HitTestResult.SRC_ANCHOR_TYPE) {
                    break;
                }
                // otherwise fall through to handle image part
            case WebView.HitTestResult.IMAGE_TYPE:
                if (type == WebView.HitTestResult.IMAGE_TYPE) {
                    menu.setHeaderTitle(extra);
                }
                menu.findItem(R.id.view_image_context_menu_id).setIntent(
                        new Intent(Intent.ACTION_VIEW, Uri.parse(extra)));
                menu.findItem(R.id.download_context_menu_id).
                        setOnMenuItemClickListener(new Download(extra));
                break;

            default:
                Log.w(LOGTAG, "We should not get here.");
                break;
        }
    }

    // Attach the given tab to the content view.
    private void attachTabToContentView(TabControl.Tab t) {
        // Attach the container that contains the main WebView and any other UI
        // associated with the tab.
        mContentView.addView(t.getContainer(), COVER_SCREEN_PARAMS);

        if (mShouldShowErrorConsole) {
            ErrorConsoleView errorConsole = mTabControl.getCurrentErrorConsole(true);
            if (errorConsole.numberOfErrors() == 0) {
                errorConsole.showConsole(ErrorConsoleView.SHOW_NONE);
            } else {
                errorConsole.showConsole(ErrorConsoleView.SHOW_MINIMIZED);
            }

            mErrorConsoleContainer.addView(errorConsole,
                    new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                                                  ViewGroup.LayoutParams.WRAP_CONTENT));
        }

        WebView view = t.getWebView();
        view.setEmbeddedTitleBar(mTitleBar);
        // Attach the sub window if necessary
        attachSubWindow(t);
        // Request focus on the top window.
        t.getTopWindow().requestFocus();
    }

    // Attach a sub window to the main WebView of the given tab.
    private void attachSubWindow(TabControl.Tab t) {
        // If a sub window exists, attach it to the content view.
        final WebView subView = t.getSubWebView();
        if (subView != null) {
            final View container = t.getSubWebViewContainer();
            mContentView.addView(container, COVER_SCREEN_PARAMS);
            subView.requestFocus();
        }
    }

    // Remove the given tab from the content view.
    private void removeTabFromContentView(TabControl.Tab t) {
        // Remove the container that contains the main WebView.
        mContentView.removeView(t.getContainer());

        if (mTabControl.getCurrentErrorConsole(false) != null) {
            mErrorConsoleContainer.removeView(mTabControl.getCurrentErrorConsole(false));
        }

        WebView view = t.getWebView();
        if (view != null) {
            view.setEmbeddedTitleBar(null);
        }

        // Remove the sub window if it exists.
        if (t.getSubWebView() != null) {
            mContentView.removeView(t.getSubWebViewContainer());
        }
    }

    // Remove the sub window if it exists. Also called by TabControl when the
    // user clicks the 'X' to dismiss a sub window.
    /* package */ void dismissSubWindow(TabControl.Tab t) {
        final WebView mainView = t.getWebView();
        if (t.getSubWebView() != null) {
            // Remove the container view and request focus on the main WebView.
            mContentView.removeView(t.getSubWebViewContainer());
            mainView.requestFocus();
            // Tell the TabControl to dismiss the subwindow. This will destroy
            // the WebView.
            mTabControl.dismissSubWindow(t);
        }
    }

    // A wrapper function of {@link #openTabAndShow(UrlData, boolean, String)}
    // that accepts url as string.
    private TabControl.Tab openTabAndShow(String url, boolean closeOnExit,
            String appId) {
        return openTabAndShow(new UrlData(url), closeOnExit, appId);
    }

    // This method does a ton of stuff. It will attempt to create a new tab
    // if we haven't reached MAX_TABS. Otherwise it uses the current tab. If
    // url isn't null, it will load the given url.
    /* package */ TabControl.Tab openTabAndShow(UrlData urlData,
            boolean closeOnExit, String appId) {
        final boolean newTab = mTabControl.getTabCount() != TabControl.MAX_TABS;
        final TabControl.Tab currentTab = mTabControl.getCurrentTab();
        if (newTab) {
            final TabControl.Tab tab = mTabControl.createNewTab(
                    closeOnExit, appId, urlData.mUrl);
            WebView webview = tab.getWebView();
            mTitleBar.addTab(webview, true);
            // If the last tab was removed from the active tabs page, currentTab
            // will be null.
            if (currentTab != null) {
                removeTabFromContentView(currentTab);
            }
            attachTabToContentView(tab);
            // We must set the new tab as the current tab to reflect the old
            // animation behavior.
            mTabControl.setCurrentTab(tab);
            if (!urlData.isEmpty()) {
                urlData.loadIn(webview);
            }
            return tab;
        } else {
            // Get rid of the subwindow if it exists
            dismissSubWindow(currentTab);
            if (!urlData.isEmpty()) {
                // Load the given url.
                urlData.loadIn(currentTab.getWebView());
            }
        }
        return currentTab;
    }

    private TabControl.Tab openTab(String url) {
        if (mSettings.openInBackground()) {
            TabControl.Tab t = mTabControl.createNewTab();
            if (t != null) {
                WebView view = t.getWebView();
                mTitleBar.addTab(view, false);
                view.loadUrl(url);
            }
            return t;
        } else {
            return openTabAndShow(url, false, null);
        }
    }

    private class Copy implements OnMenuItemClickListener {
        private CharSequence mText;

        public boolean onMenuItemClick(MenuItem item) {
            copy(mText);
            return true;
        }

        public Copy(CharSequence toCopy) {
            mText = toCopy;
        }
    }

    private class Download implements OnMenuItemClickListener {
        private String mText;

        public boolean onMenuItemClick(MenuItem item) {
            onDownloadStartNoStream(mText, null, null, null, -1);
            return true;
        }

        public Download(String toDownload) {
            mText = toDownload;
        }
    }

    private void copy(CharSequence text) {
        try {
            IClipboard clip = IClipboard.Stub.asInterface(ServiceManager.getService("clipboard"));
            if (clip != null) {
                clip.setClipboardText(text);
            }
        } catch (android.os.RemoteException e) {
            Log.e(LOGTAG, "Copy failed", e);
        }
    }

    /**
     * Resets the browser title-view to whatever it must be (for example, if we
     * load a page from history).
     */
    private void resetTitle() {
        resetLockIcon();
        resetTitleIconAndProgress();
    }

    /**
     * Resets the browser title-view to whatever it must be
     * (for example, if we had a loading error)
     * When we have a new page, we call resetTitle, when we
     * have to reset the titlebar to whatever it used to be
     * (for example, if the user chose to stop loading), we
     * call resetTitleAndRevertLockIcon.
     */
    /* package */ void resetTitleAndRevertLockIcon() {
        revertLockIcon();
        resetTitleIconAndProgress();
    }

    /**
     * Reset the title, favicon, and progress.
     */
    private void resetTitleIconAndProgress() {
        WebView current = mTabControl.getCurrentWebView();
        if (current == null) {
            return;
        }
        resetTitleAndIcon(current);
        int progress = current.getProgress();
        mWebChromeClient.onProgressChanged(current, progress);
    }

    // Reset the title and the icon based on the given item.
    private void resetTitleAndIcon(WebView view) {
        WebHistoryItem item = view.copyBackForwardList().getCurrentItem();
        if (item != null) {
            setUrlTitle(item.getUrl(), item.getTitle(), view);
            setFavicon(item.getFavicon());
        } else {
            setUrlTitle(null, null, view);
            setFavicon(null);
        }
    }

    /**
     * Sets a title composed of the URL and the title string.
     * @param url The URL of the site being loaded.
     * @param title The title of the site being loaded.
     */
    private void setUrlTitle(String url, String title, WebView view) {
        mUrl = url;
        mTitle = title;

        mTitleBar.setTitleAndUrl(title, url, view);
        if (mFakeTitleBar != null) {
            mFakeTitleBar.setTitleAndUrl(title, url);
        }
    }

    /**
     * @param url The URL to build a title version of the URL from.
     * @return The title version of the URL or null if fails.
     * The title version of the URL can be either the URL hostname,
     * or the hostname with an "https://" prefix (for secure URLs),
     * or an empty string if, for example, the URL in question is a
     * file:// URL with no hostname.
     */
    /* package */ static String buildTitleUrl(String url) {
        String titleUrl = null;

        if (url != null) {
            try {
                // parse the url string
                URL urlObj = new URL(url);
                if (urlObj != null) {
                    titleUrl = "";

                    String protocol = urlObj.getProtocol();
                    String host = urlObj.getHost();

                    if (host != null && 0 < host.length()) {
                        titleUrl = host;
                        if (protocol != null) {
                            // if a secure site, add an "https://" prefix!
                            if (protocol.equalsIgnoreCase("https")) {
                                titleUrl = protocol + "://" + host;
                            }
                        }
                    }
                }
            } catch (MalformedURLException e) {}
        }

        return titleUrl;
    }

    // Set the favicon in the title bar.
    private void setFavicon(Bitmap icon) {
        mTitleBar.setFavicon(icon, getTopWindow());
        if (mFakeTitleBar != null) {
            mFakeTitleBar.setFavicon(icon);
        }
    }

    /**
     * Saves the current lock-icon state before resetting
     * the lock icon. If we have an error, we may need to
     * roll back to the previous state.
     */
    private void saveLockIcon() {
        mPrevLockType = mLockIconType;
    }

    /**
     * Reverts the lock-icon state to the last saved state,
     * for example, if we had an error, and need to cancel
     * the load.
     */
    private void revertLockIcon() {
        mLockIconType = mPrevLockType;

        if (LOGV_ENABLED) {
            Log.v(LOGTAG, "BrowserActivity.revertLockIcon:" +
                  " revert lock icon to " + mLockIconType);
        }

        updateLockIconToLatest();
    }

    /**
     * Close the tab, remove its associated title bar, and adjust mTabControl's
     * current tab to a valid value.
     */
    /* package */ void closeTab(TabControl.Tab t) {
        int currentIndex = mTabControl.getCurrentIndex();
        int removeIndex = mTabControl.getTabIndex(t);
        mTitleBar.removeTab(removeIndex);
        mTabControl.removeTab(t);
        if (currentIndex >= removeIndex && currentIndex != 0) {
            currentIndex--;
        }
        mTabControl.setCurrentTab(mTabControl.getTab(currentIndex));
    }

    private void goBackOnePageOrQuit() {
        TabControl.Tab current = mTabControl.getCurrentTab();
        if (current == null) {
            /*
             * Instead of finishing the activity, simply push this to the back
             * of the stack and let ActivityManager to choose the foreground
             * activity. As BrowserActivity is singleTask, it will be always the
             * root of the task. So we can use either true or false for
             * moveTaskToBack().
             */
            moveTaskToBack(true);
        }
        WebView w = current.getWebView();
        if (w.canGoBack()) {
            w.goBack();
        } else {
            // Check to see if we are closing a window that was created by
            // another window. If so, we switch back to that window.
            TabControl.Tab parent = current.getParentTab();
            if (parent != null) {
                switchToTab(mTabControl.getTabIndex(parent));
                // Now we close the other tab
                closeTab(current);
            } else {
                if (current.closeOnExit()) {
                    // force mPageStarted to be false as we are going to either
                    // finish the activity or remove the tab. This will ensure
                    // pauseWebView() taking action.
                    mPageStarted = false;
                    if (mTabControl.getTabCount() == 1) {
                        finish();
                        return;
                    }
                    // call pauseWebViewTimers() now, we won't be able to call
                    // it in onPause() as the WebView won't be valid.
                    // Temporarily change mActivityInPause to be true as
                    // pauseWebViewTimers() will do nothing if mActivityInPause
                    // is false.
                    boolean savedState = mActivityInPause;
                    if (savedState) {
                        Log.e(LOGTAG, "BrowserActivity is already paused "
                                + "while handing goBackOnePageOrQuit.");
                    }
                    mActivityInPause = true;
                    pauseWebViewTimers();
                    mActivityInPause = savedState;
                    removeTabFromContentView(current);
                    mTitleBar.removeTab(mTabControl.getTabIndex(current));
                    mTabControl.removeTab(current);
                }
                /*
                 * Instead of finishing the activity, simply push this to the back
                 * of the stack and let ActivityManager to choose the foreground
                 * activity. As BrowserActivity is singleTask, it will be always the
                 * root of the task. So we can use either true or false for
                 * moveTaskToBack().
                 */
                moveTaskToBack(true);
            }
        }
    }

    public KeyTracker.State onKeyTracker(int keyCode,
                                         KeyEvent event,
                                         KeyTracker.Stage stage,
                                         int duration) {
        // if onKeyTracker() is called after activity onStop()
        // because of accumulated key events,
        // we should ignore it as browser is not active any more.
        WebView topWindow = getTopWindow();
        if (topWindow == null && mCustomView == null)
            return KeyTracker.State.NOT_TRACKING;

        if (keyCode == KeyEvent.KEYCODE_BACK) {
            // Check if a custom view is currently showing and, if it is, hide it.
            if (mCustomView != null) {
                mWebChromeClient.onHideCustomView();
                return KeyTracker.State.DONE_TRACKING;
            }
            if (stage == KeyTracker.Stage.LONG_REPEAT) {
                bookmarksOrHistoryPicker(true);
                return KeyTracker.State.DONE_TRACKING;
            } else if (stage == KeyTracker.Stage.UP) {
                // FIXME: Currently, we do not have a notion of the
                // history picker for the subwindow, but maybe we
                // should?
                WebView subwindow = mTabControl.getCurrentSubWindow();
                if (subwindow != null) {
                    if (subwindow.canGoBack()) {
                        subwindow.goBack();
                    } else {
                        dismissSubWindow(mTabControl.getCurrentTab());
                    }
                } else {
                    goBackOnePageOrQuit();
                }
                return KeyTracker.State.DONE_TRACKING;
            }
            return KeyTracker.State.KEEP_TRACKING;
        }
        return KeyTracker.State.NOT_TRACKING;
    }

    @Override public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_MENU) {
            mMenuIsDown = true;
        } else if (mMenuIsDown) {
            // The default key mode is DEFAULT_KEYS_SEARCH_LOCAL. As the MENU is
            // still down, we don't want to trigger the search. Pretend to
            // consume the key and do nothing.
            return true;
        }
        boolean handled =  mKeyTracker.doKeyDown(keyCode, event);
        if (!handled) {
            switch (keyCode) {
                case KeyEvent.KEYCODE_SPACE:
                    if (event.isShiftPressed()) {
                        getTopWindow().pageUp(false);
                    } else {
                        getTopWindow().pageDown(false);
                    }
                    handled = true;
                    break;

                default:
                    break;
            }
        }
        return handled || super.onKeyDown(keyCode, event);
    }

    @Override public boolean onKeyUp(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_MENU) {
            mMenuIsDown = false;
        }
        return mKeyTracker.doKeyUp(keyCode, event) || super.onKeyUp(keyCode, event);
    }

    private void stopLoading() {
        resetTitleAndRevertLockIcon();
        WebView w = getTopWindow();
        w.stopLoading();
        mWebViewClient.onPageFinished(w, w.getUrl());

        cancelStopToast();
        mStopToast = Toast
                .makeText(this, R.string.stopping, Toast.LENGTH_SHORT);
        mStopToast.show();
    }

    private void cancelStopToast() {
        if (mStopToast != null) {
            mStopToast.cancel();
            mStopToast = null;
        }
    }

    // called by a non-UI thread to post the message
    public void postMessage(int what, int arg1, int arg2, Object obj) {
        mHandler.sendMessage(mHandler.obtainMessage(what, arg1, arg2, obj));
    }

    // public message ids
    public final static int LOAD_URL                = 1001;
    public final static int STOP_LOAD               = 1002;

    // Message Ids
    private static final int FOCUS_NODE_HREF         = 102;
    private static final int CANCEL_CREDS_REQUEST    = 103;
    private static final int RELEASE_WAKELOCK        = 107;

    // Private handler for handling javascript and saving passwords
    private Handler mHandler = new Handler() {

        public void handleMessage(Message msg) {
            switch (msg.what) {
                case FOCUS_NODE_HREF:
                    String url = (String) msg.getData().get("url");
                    if (url == null || url.length() == 0) {
                        break;
                    }
                    HashMap focusNodeMap = (HashMap) msg.obj;
                    WebView view = (WebView) focusNodeMap.get("webview");
                    // Only apply the action if the top window did not change.
                    if (getTopWindow() != view) {
                        break;
                    }
                    switch (msg.arg1) {
                        case R.id.open_context_menu_id:
                        case R.id.view_image_context_menu_id:
                            loadURL(getTopWindow(), url);
                            break;
                        case R.id.open_newtab_context_menu_id:
                            final TabControl.Tab parent = mTabControl
                                    .getCurrentTab();
                            final TabControl.Tab newTab = openTab(url);
                            if (newTab != parent) {
                                parent.addChildTab(newTab);
                            }
                            break;
                        case R.id.bookmark_context_menu_id:
                            Intent intent = new Intent(BrowserActivity.this,
                                    AddBookmarkPage.class);
                            intent.putExtra("url", url);
                            startActivity(intent);
                            break;
                        case R.id.share_link_context_menu_id:
                            Browser.sendString(BrowserActivity.this, url);
                            break;
                        case R.id.copy_link_context_menu_id:
                            copy(url);
                            break;
                        case R.id.save_link_context_menu_id:
                        case R.id.download_context_menu_id:
                            onDownloadStartNoStream(url, null, null, null, -1);
                            break;
                    }
                    break;

                case LOAD_URL:
                    loadURL(getTopWindow(), (String) msg.obj);
                    break;

                case STOP_LOAD:
                    stopLoading();
                    break;

                case CANCEL_CREDS_REQUEST:
                    resumeAfterCredentials();
                    break;

                case RELEASE_WAKELOCK:
                    if (mWakeLock.isHeld()) {
                        mWakeLock.release();
                    }
                    break;
            }
        }
    };

    private void updateScreenshot(WebView view) {
        // If this is a bookmarked site, add a screenshot to the database.
        // FIXME: When should we update?  Every time?
        // FIXME: Would like to make sure there is actually something to
        // draw, but the API for that (WebViewCore.pictureReady()) is not
        // currently accessible here.
        ContentResolver cr = getContentResolver();
        final Cursor c = BrowserBookmarksAdapter.queryBookmarksForUrl(
                cr, view.getOriginalUrl(), view.getUrl(), false);
        if (c != null) {
            boolean succeed = c.moveToFirst();
            ContentValues values = null;
            while (succeed) {
                if (values == null) {
                    final ByteArrayOutputStream os
                            = new ByteArrayOutputStream();
                    Picture thumbnail = view.capturePicture();
                    // Keep width and height in sync with BrowserBookmarksPage
                    // and bookmark_thumb
                    Bitmap bm = Bitmap.createBitmap(100, 80,
                            Bitmap.Config.ARGB_4444);
                    Canvas canvas = new Canvas(bm);
                    // May need to tweak these values to determine what is the
                    // best scale factor
                    canvas.scale(.5f, .5f);
                    thumbnail.draw(canvas);
                    bm.compress(Bitmap.CompressFormat.PNG, 100, os);
                    values = new ContentValues();
                    values.put(Browser.BookmarkColumns.THUMBNAIL,
                            os.toByteArray());
                }
                cr.update(ContentUris.withAppendedId(Browser.BOOKMARKS_URI,
                        c.getInt(0)), values, null, null);
                succeed = c.moveToNext();
            }
            c.close();
        }
    }

    // -------------------------------------------------------------------------
    // WebViewClient implementation.
    //-------------------------------------------------------------------------

    // Use in overrideUrlLoading
    /* package */ final static String SCHEME_WTAI = "wtai://wp/";
    /* package */ final static String SCHEME_WTAI_MC = "wtai://wp/mc;";
    /* package */ final static String SCHEME_WTAI_SD = "wtai://wp/sd;";
    /* package */ final static String SCHEME_WTAI_AP = "wtai://wp/ap;";

    /* package */ WebViewClient getWebViewClient() {
        return mWebViewClient;
    }

    private void updateIcon(WebView view, Bitmap icon) {
        if (icon != null) {
            BrowserBookmarksAdapter.updateBookmarkFavicon(mResolver,
                    view, icon);
        }
        setFavicon(icon);
    }

    private final WebViewClient mWebViewClient = new WebViewClient() {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            resetLockIcon(url);
            setUrlTitle(url, null, view);

            ErrorConsoleView errorConsole = mTabControl.getCurrentErrorConsole(false);
            if (errorConsole != null) {
                errorConsole.clearErrorMessages();
                if (mShouldShowErrorConsole) {
                    errorConsole.showConsole(ErrorConsoleView.SHOW_NONE);
                }
            }

            // Call updateIcon instead of setFavicon so the bookmark
            // database can be updated.
            updateIcon(view, favicon);

            if (mSettings.isTracing()) {
                String host;
                try {
                    WebAddress uri = new WebAddress(url);
                    host = uri.mHost;
                } catch (android.net.ParseException ex) {
                    host = "browser";
                }
                host = host.replace('.', '_');
                host += ".trace";
                mInTrace = true;
                Debug.startMethodTracing(host, 20 * 1024 * 1024);
            }

            // Performance probe
            if (false) {
                mStart = SystemClock.uptimeMillis();
                mProcessStart = Process.getElapsedCpuTime();
                long[] sysCpu = new long[7];
                if (Process.readProcFile("/proc/stat", SYSTEM_CPU_FORMAT, null,
                        sysCpu, null)) {
                    mUserStart = sysCpu[0] + sysCpu[1];
                    mSystemStart = sysCpu[2];
                    mIdleStart = sysCpu[3];
                    mIrqStart = sysCpu[4] + sysCpu[5] + sysCpu[6];
                }
                mUiStart = SystemClock.currentThreadTimeMillis();
            }

            if (!mPageStarted) {
                mPageStarted = true;
                // if onResume() has been called, resumeWebViewTimers() does
                // nothing.
                resumeWebViewTimers();
            }

            // reset sync timer to avoid sync starts during loading a page
            CookieSyncManager.getInstance().resetSync();

            mInLoad = true;
            WebView currentWebView = mTabControl.getCurrentWebView();
            if (currentWebView == null || currentWebView.getScrollY() != 0) {
                // This page has begun to load, so show the title bar
                showFakeTitleBar();
            }
            updateInLoadMenuItems();
            if (!mIsNetworkUp) {
                if ( mAlertDialog == null) {
                    mAlertDialog = new AlertDialog.Builder(BrowserActivity.this)
                        .setTitle(R.string.loadSuspendedTitle)
                        .setMessage(R.string.loadSuspended)
                        .setPositiveButton(R.string.ok, null)
                        .show();
                }
                if (view != null) {
                    view.setNetworkAvailable(false);
                }
            }
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            // Reset the title and icon in case we stopped a provisional
            // load.
            resetTitleAndIcon(view);

            // Update the lock icon image only once we are done loading
            updateLockIconToLatest();
            updateScreenshot(view);

            // Performance probe
            if (false) {
                long[] sysCpu = new long[7];
                if (Process.readProcFile("/proc/stat", SYSTEM_CPU_FORMAT, null,
                        sysCpu, null)) {
                    String uiInfo = "UI thread used "
                            + (SystemClock.currentThreadTimeMillis() - mUiStart)
                            + " ms";
                    if (LOGD_ENABLED) {
                        Log.d(LOGTAG, uiInfo);
                    }
                    //The string that gets written to the log
                    String performanceString = "It took total "
                            + (SystemClock.uptimeMillis() - mStart)
                            + " ms clock time to load the page."
                            + "\nbrowser process used "
                            + (Process.getElapsedCpuTime() - mProcessStart)
                            + " ms, user processes used "
                            + (sysCpu[0] + sysCpu[1] - mUserStart) * 10
                            + " ms, kernel used "
                            + (sysCpu[2] - mSystemStart) * 10
                            + " ms, idle took " + (sysCpu[3] - mIdleStart) * 10
                            + " ms and irq took "
                            + (sysCpu[4] + sysCpu[5] + sysCpu[6] - mIrqStart)
                            * 10 + " ms, " + uiInfo;
                    if (LOGD_ENABLED) {
                        Log.d(LOGTAG, performanceString + "\nWebpage: " + url);
                    }
                    if (url != null) {
                        // strip the url to maintain consistency
                        String newUrl = new String(url);
                        if (newUrl.startsWith("http://www.")) {
                            newUrl = newUrl.substring(11);
                        } else if (newUrl.startsWith("http://")) {
                            newUrl = newUrl.substring(7);
                        } else if (newUrl.startsWith("https://www.")) {
                            newUrl = newUrl.substring(12);
                        } else if (newUrl.startsWith("https://")) {
                            newUrl = newUrl.substring(8);
                        }
                        if (LOGD_ENABLED) {
                            Log.d(LOGTAG, newUrl + " loaded");
                        }
                        /*
                        if (sWhiteList.contains(newUrl)) {
                            // The string that gets pushed to the statistcs
                            // service
                            performanceString = performanceString
                                    + "\nWebpage: "
                                    + newUrl
                                    + "\nCarrier: "
                                    + android.os.SystemProperties
                                            .get("gsm.sim.operator.alpha");
                            if (mWebView != null
                                    && mWebView.getContext() != null
                                    && mWebView.getContext().getSystemService(
                                    Context.CONNECTIVITY_SERVICE) != null) {
                                ConnectivityManager cManager =
                                        (ConnectivityManager) mWebView
                                        .getContext().getSystemService(
                                        Context.CONNECTIVITY_SERVICE);
                                NetworkInfo nInfo = cManager
                                        .getActiveNetworkInfo();
                                if (nInfo != null) {
                                    performanceString = performanceString
                                            + "\nNetwork Type: "
                                            + nInfo.getType().toString();
                                }
                            }
                            Checkin.logEvent(mResolver,
                                    Checkin.Events.Tag.WEBPAGE_LOAD,
                                    performanceString);
                            Log.w(LOGTAG, "pushed to the statistics service");
                        }
                        */
                    }
                }
             }

            if (mInTrace) {
                mInTrace = false;
                Debug.stopMethodTracing();
            }

            if (mPageStarted) {
                mPageStarted = false;
                // pauseWebViewTimers() will do nothing and return false if
                // onPause() is not called yet.
                if (pauseWebViewTimers()) {
                    if (mWakeLock.isHeld()) {
                        mHandler.removeMessages(RELEASE_WAKELOCK);
                        mWakeLock.release();
                    }
                }
            }
        }

        // return true if want to hijack the url to let another app to handle it
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (url.startsWith(SCHEME_WTAI)) {
                // wtai://wp/mc;number
                // number=string(phone-number)
                if (url.startsWith(SCHEME_WTAI_MC)) {
                    Intent intent = new Intent(Intent.ACTION_VIEW,
                            Uri.parse(WebView.SCHEME_TEL +
                            url.substring(SCHEME_WTAI_MC.length())));
                    startActivity(intent);
                    return true;
                }
                // wtai://wp/sd;dtmf
                // dtmf=string(dialstring)
                if (url.startsWith(SCHEME_WTAI_SD)) {
                    // TODO
                    // only send when there is active voice connection
                    return false;
                }
                // wtai://wp/ap;number;name
                // number=string(phone-number)
                // name=string
                if (url.startsWith(SCHEME_WTAI_AP)) {
                    // TODO
                    return false;
                }
            }

            // The "about:" schemes are internal to the browser; don't
            // want these to be dispatched to other apps.
            if (url.startsWith("about:")) {
                return false;
            }

            Intent intent;

            // perform generic parsing of the URI to turn it into an Intent.
            try {
                intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
            } catch (URISyntaxException ex) {
                Log.w("Browser", "Bad URI " + url + ": " + ex.getMessage());
                return false;
            }

            // check whether the intent can be resolved. If not, we will see
            // whether we can download it from the Market.
            if (getPackageManager().resolveActivity(intent, 0) == null) {
                String packagename = intent.getPackage();
                if (packagename != null) {
                    intent = new Intent(Intent.ACTION_VIEW, Uri
                            .parse("market://search?q=pname:" + packagename));
                    intent.addCategory(Intent.CATEGORY_BROWSABLE);
                    startActivity(intent);
                    return true;
                } else {
                    return false;
                }
            }

            // sanitize the Intent, ensuring web pages can not bypass browser
            // security (only access to BROWSABLE activities).
            intent.addCategory(Intent.CATEGORY_BROWSABLE);
            intent.setComponent(null);
            try {
                if (startActivityIfNeeded(intent, -1)) {
                    return true;
                }
            } catch (ActivityNotFoundException ex) {
                // ignore the error. If no application can handle the URL,
                // eg about:blank, assume the browser can handle it.
            }

            if (mMenuIsDown) {
                openTab(url);
                closeOptionsMenu();
                return true;
            }

            return false;
        }

        /**
         * Updates the lock icon. This method is called when we discover another
         * resource to be loaded for this page (for example, javascript). While
         * we update the icon type, we do not update the lock icon itself until
         * we are done loading, it is slightly more secure this way.
         */
        @Override
        public void onLoadResource(WebView view, String url) {
            if (url != null && url.length() > 0) {
                // It is only if the page claims to be secure
                // that we may have to update the lock:
                if (mLockIconType == LOCK_ICON_SECURE) {
                    // If NOT a 'safe' url, change the lock to mixed content!
                    if (!(URLUtil.isHttpsUrl(url) || URLUtil.isDataUrl(url) || URLUtil.isAboutUrl(url))) {
                        mLockIconType = LOCK_ICON_MIXED;
                        if (LOGV_ENABLED) {
                            Log.v(LOGTAG, "BrowserActivity.updateLockIcon:" +
                                  " updated lock icon to " + mLockIconType + " due to " + url);
                        }
                    }
                }
            }
        }

        /**
         * Show the dialog, asking the user if they would like to continue after
         * an excessive number of HTTP redirects.
         */
        @Override
        public void onTooManyRedirects(WebView view, final Message cancelMsg,
                final Message continueMsg) {
            new AlertDialog.Builder(BrowserActivity.this)
                .setTitle(R.string.browserFrameRedirect)
                .setMessage(R.string.browserFrame307Post)
                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        continueMsg.sendToTarget();
                    }})
                .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        cancelMsg.sendToTarget();
                    }})
                .setOnCancelListener(new OnCancelListener() {
                    public void onCancel(DialogInterface dialog) {
                        cancelMsg.sendToTarget();
                    }})
                .show();
        }

        // Container class for the next error dialog that needs to be
        // displayed.
        class ErrorDialog {
            public final int mTitle;
            public final String mDescription;
            public final int mError;
            ErrorDialog(int title, String desc, int error) {
                mTitle = title;
                mDescription = desc;
                mError = error;
            }
        };

        private void processNextError() {
            if (mQueuedErrors == null) {
                return;
            }
            // The first one is currently displayed so just remove it.
            mQueuedErrors.removeFirst();
            if (mQueuedErrors.size() == 0) {
                mQueuedErrors = null;
                return;
            }
            showError(mQueuedErrors.getFirst());
        }

        private DialogInterface.OnDismissListener mDialogListener =
                new DialogInterface.OnDismissListener() {
                    public void onDismiss(DialogInterface d) {
                        processNextError();
                    }
                };
        private LinkedList<ErrorDialog> mQueuedErrors;

        private void queueError(int err, String desc) {
            if (mQueuedErrors == null) {
                mQueuedErrors = new LinkedList<ErrorDialog>();
            }
            for (ErrorDialog d : mQueuedErrors) {
                if (d.mError == err) {
                    // Already saw a similar error, ignore the new one.
                    return;
                }
            }
            ErrorDialog errDialog = new ErrorDialog(
                    err == WebViewClient.ERROR_FILE_NOT_FOUND ?
                    R.string.browserFrameFileErrorLabel :
                    R.string.browserFrameNetworkErrorLabel,
                    desc, err);
            mQueuedErrors.addLast(errDialog);

            // Show the dialog now if the queue was empty.
            if (mQueuedErrors.size() == 1) {
                showError(errDialog);
            }
        }

        private void showError(ErrorDialog errDialog) {
            AlertDialog d = new AlertDialog.Builder(BrowserActivity.this)
                    .setTitle(errDialog.mTitle)
                    .setMessage(errDialog.mDescription)
                    .setPositiveButton(R.string.ok, null)
                    .create();
            d.setOnDismissListener(mDialogListener);
            d.show();
        }

        /**
         * Show a dialog informing the user of the network error reported by
         * WebCore.
         */
        @Override
        public void onReceivedError(WebView view, int errorCode,
                String description, String failingUrl) {
            if (errorCode != WebViewClient.ERROR_HOST_LOOKUP &&
                    errorCode != WebViewClient.ERROR_CONNECT &&
                    errorCode != WebViewClient.ERROR_BAD_URL &&
                    errorCode != WebViewClient.ERROR_UNSUPPORTED_SCHEME &&
                    errorCode != WebViewClient.ERROR_FILE) {
                queueError(errorCode, description);
            }
            Log.e(LOGTAG, "onReceivedError " + errorCode + " " + failingUrl
                    + " " + description);

            // We need to reset the title after an error.
            resetTitleAndRevertLockIcon();
        }

        /**
         * Check with the user if it is ok to resend POST data as the page they
         * are trying to navigate to is the result of a POST.
         */
        @Override
        public void onFormResubmission(WebView view, final Message dontResend,
                                       final Message resend) {
            new AlertDialog.Builder(BrowserActivity.this)
                .setTitle(R.string.browserFrameFormResubmitLabel)
                .setMessage(R.string.browserFrameFormResubmitMessage)
                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        resend.sendToTarget();
                    }})
                .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dontResend.sendToTarget();
                    }})
                .setOnCancelListener(new OnCancelListener() {
                    public void onCancel(DialogInterface dialog) {
                        dontResend.sendToTarget();
                    }})
                .show();
        }

        /**
         * Insert the url into the visited history database.
         * @param url The url to be inserted.
         * @param isReload True if this url is being reloaded.
         * FIXME: Not sure what to do when reloading the page.
         */
        @Override
        public void doUpdateVisitedHistory(WebView view, String url,
                boolean isReload) {
            if (url.regionMatches(true, 0, "about:", 0, 6)) {
                return;
            }
            // remove "client" before updating it to the history so that it wont
            // show up in the auto-complete list.
            int index = url.indexOf("client=ms-");
            if (index > 0 && url.contains(".google.")) {
                int end = url.indexOf('&', index);
                if (end > 0) {
                    url = url.substring(0, index-1).concat(url.substring(end));
                } else {
                    url = url.substring(0, index-1);
                }
            }
            Browser.updateVisitedHistory(mResolver, url, true);
            WebIconDatabase.getInstance().retainIconForPageUrl(url);
        }

        /**
         * Displays SSL error(s) dialog to the user.
         */
        @Override
        public void onReceivedSslError(
            final WebView view, final SslErrorHandler handler, final SslError error) {

            if (mSettings.showSecurityWarnings()) {
                final LayoutInflater factory =
                    LayoutInflater.from(BrowserActivity.this);
                final View warningsView =
                    factory.inflate(R.layout.ssl_warnings, null);
                final LinearLayout placeholder =
                    (LinearLayout)warningsView.findViewById(R.id.placeholder);

                if (error.hasError(SslError.SSL_UNTRUSTED)) {
                    LinearLayout ll = (LinearLayout)factory
                        .inflate(R.layout.ssl_warning, null);
                    ((TextView)ll.findViewById(R.id.warning))
                        .setText(R.string.ssl_untrusted);
                    placeholder.addView(ll);
                }

                if (error.hasError(SslError.SSL_IDMISMATCH)) {
                    LinearLayout ll = (LinearLayout)factory
                        .inflate(R.layout.ssl_warning, null);
                    ((TextView)ll.findViewById(R.id.warning))
                        .setText(R.string.ssl_mismatch);
                    placeholder.addView(ll);
                }

                if (error.hasError(SslError.SSL_EXPIRED)) {
                    LinearLayout ll = (LinearLayout)factory
                        .inflate(R.layout.ssl_warning, null);
                    ((TextView)ll.findViewById(R.id.warning))
                        .setText(R.string.ssl_expired);
                    placeholder.addView(ll);
                }

                if (error.hasError(SslError.SSL_NOTYETVALID)) {
                    LinearLayout ll = (LinearLayout)factory
                        .inflate(R.layout.ssl_warning, null);
                    ((TextView)ll.findViewById(R.id.warning))
                        .setText(R.string.ssl_not_yet_valid);
                    placeholder.addView(ll);
                }

                new AlertDialog.Builder(BrowserActivity.this)
                    .setTitle(R.string.security_warning)
                    .setIcon(android.R.drawable.ic_dialog_alert)
                    .setView(warningsView)
                    .setPositiveButton(R.string.ssl_continue,
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int whichButton) {
                                    handler.proceed();
                                }
                            })
                    .setNeutralButton(R.string.view_certificate,
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int whichButton) {
                                    showSSLCertificateOnError(view, handler, error);
                                }
                            })
                    .setNegativeButton(R.string.cancel,
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int whichButton) {
                                    handler.cancel();
                                    BrowserActivity.this.resetTitleAndRevertLockIcon();
                                }
                            })
                    .setOnCancelListener(
                            new DialogInterface.OnCancelListener() {
                                public void onCancel(DialogInterface dialog) {
                                    handler.cancel();
                                    BrowserActivity.this.resetTitleAndRevertLockIcon();
                                }
                            })
                    .show();
            } else {
                handler.proceed();
            }
        }

        /**
         * Handles an HTTP authentication request.
         *
         * @param handler The authentication handler
         * @param host The host
         * @param realm The realm
         */
        @Override
        public void onReceivedHttpAuthRequest(WebView view,
                final HttpAuthHandler handler, final String host, final String realm) {
            String username = null;
            String password = null;

            boolean reuseHttpAuthUsernamePassword =
                handler.useHttpAuthUsernamePassword();

            if (reuseHttpAuthUsernamePassword &&
                    (mTabControl.getCurrentWebView() != null)) {
                String[] credentials =
                        mTabControl.getCurrentWebView()
                                .getHttpAuthUsernamePassword(host, realm);
                if (credentials != null && credentials.length == 2) {
                    username = credentials[0];
                    password = credentials[1];
                }
            }

            if (username != null && password != null) {
                handler.proceed(username, password);
            } else {
                showHttpAuthentication(handler, host, realm, null, null, null, 0);
            }
        }

        @Override
        public boolean shouldOverrideKeyEvent(WebView view, KeyEvent event) {
            if (mMenuIsDown) {
                // only check shortcut key when MENU is held
                return getWindow().isShortcutKey(event.getKeyCode(), event);
            } else {
                return false;
            }
        }

        @Override
        public void onUnhandledKeyEvent(WebView view, KeyEvent event) {
            if (view != mTabControl.getCurrentTopWebView()) {
                return;
            }
            if (event.isDown()) {
                BrowserActivity.this.onKeyDown(event.getKeyCode(), event);
            } else {
                BrowserActivity.this.onKeyUp(event.getKeyCode(), event);
            }
        }
    };

    //--------------------------------------------------------------------------
    // WebChromeClient implementation
    //--------------------------------------------------------------------------

    /* package */ WebChromeClient getWebChromeClient() {
        return mWebChromeClient;
    }

    private final WebChromeClient mWebChromeClient = new WebChromeClient() {
        // Helper method to create a new tab or sub window.
        private void createWindow(final boolean dialog, final Message msg) {
            if (dialog) {
                mTabControl.createSubWindow();
                final TabControl.Tab t = mTabControl.getCurrentTab();
                attachSubWindow(t);
                WebView.WebViewTransport transport =
                        (WebView.WebViewTransport) msg.obj;
                transport.setWebView(t.getSubWebView());
                msg.sendToTarget();
            } else {
                final TabControl.Tab parent = mTabControl.getCurrentTab();
                final TabControl.Tab newTab
                        = openTabAndShow(EMPTY_URL_DATA, false, null);
                if (newTab != parent) {
                    parent.addChildTab(newTab);
                }
                WebView.WebViewTransport transport =
                        (WebView.WebViewTransport) msg.obj;
                transport.setWebView(mTabControl.getCurrentWebView());
                msg.sendToTarget();
            }
        }

        @Override
        public boolean onCreateWindow(WebView view, final boolean dialog,
                final boolean userGesture, final Message resultMsg) {
            // Short-circuit if we can't create any more tabs or sub windows.
            if (dialog && mTabControl.getCurrentSubWindow() != null) {
                new AlertDialog.Builder(BrowserActivity.this)
                        .setTitle(R.string.too_many_subwindows_dialog_title)
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .setMessage(R.string.too_many_subwindows_dialog_message)
                        .setPositiveButton(R.string.ok, null)
                        .show();
                return false;
            } else if (mTabControl.getTabCount() >= TabControl.MAX_TABS) {
                new AlertDialog.Builder(BrowserActivity.this)
                        .setTitle(R.string.too_many_windows_dialog_title)
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .setMessage(R.string.too_many_windows_dialog_message)
                        .setPositiveButton(R.string.ok, null)
                        .show();
                return false;
            }

            // Short-circuit if this was a user gesture.
            if (userGesture) {
                createWindow(dialog, resultMsg);
                return true;
            }

            // Allow the popup and create the appropriate window.
            final AlertDialog.OnClickListener allowListener =
                    new AlertDialog.OnClickListener() {
                        public void onClick(DialogInterface d,
                                int which) {
                            createWindow(dialog, resultMsg);
                        }
                    };

            // Block the popup by returning a null WebView.
            final AlertDialog.OnClickListener blockListener =
                    new AlertDialog.OnClickListener() {
                        public void onClick(DialogInterface d, int which) {
                            resultMsg.sendToTarget();
                        }
                    };

            // Build a confirmation dialog to display to the user.
            final AlertDialog d =
                    new AlertDialog.Builder(BrowserActivity.this)
                    .setTitle(R.string.attention)
                    .setIcon(android.R.drawable.ic_dialog_alert)
                    .setMessage(R.string.popup_window_attempt)
                    .setPositiveButton(R.string.allow, allowListener)
                    .setNegativeButton(R.string.block, blockListener)
                    .setCancelable(false)
                    .create();

            // Show the confirmation dialog.
            d.show();
            return true;
        }

        @Override
        public void onCloseWindow(WebView window) {
            final TabControl.Tab current = mTabControl.getCurrentTab();
            final TabControl.Tab parent = current.getParentTab();
            if (parent != null) {
                // JavaScript can only close popup window.
                switchToTab(mTabControl.getTabIndex(parent));
                // Now we need to close the window
                closeTab(current);
            }
        }

        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            mTitleBar.setProgress(newProgress, view);
            if (mFakeTitleBar != null) {
                mFakeTitleBar.setProgress(newProgress);
            }

            if (newProgress == 100) {
                // onProgressChanged() is called for sub-frame too while
                // onPageFinished() is only called for the main frame. sync
                // cookie and cache promptly here.
                CookieSyncManager.getInstance().sync();
                if (mInLoad) {
                    mInLoad = false;
                    updateInLoadMenuItems();
                    // If the options menu is open, leave the title bar
                    if (!mOptionsMenuOpen || !mIconView) {
                        hideFakeTitleBar();
                    }
                }
            } else if (!mInLoad) {
                // onPageFinished may have already been called but a subframe
                // is still loading and updating the progress. Reset mInLoad
                // and update the menu items.
                mInLoad = true;
                updateInLoadMenuItems();
                WebView currentWebView = mTabControl.getCurrentWebView();
                if ((currentWebView == null || currentWebView.getScrollY() != 0)
                        && (!mOptionsMenuOpen || mIconView)) {
                    // This page has begun to load, so show the title bar
                    showFakeTitleBar();
                }
            }
        }

        @Override
        public void onReceivedTitle(WebView view, String title) {
            String url = view.getUrl();

            // here, if url is null, we want to reset the title
            setUrlTitle(url, title, view);

            if (url == null ||
                url.length() >= SQLiteDatabase.SQLITE_MAX_LIKE_PATTERN_LENGTH) {
                return;
            }
            // See if we can find the current url in our history database and
            // add the new title to it.
            if (url.startsWith("http://www.")) {
                url = url.substring(11);
            } else if (url.startsWith("http://")) {
                url = url.substring(4);
            }
            try {
                url = "%" + url;
                String [] selArgs = new String[] { url };

                String where = Browser.BookmarkColumns.URL + " LIKE ? AND "
                        + Browser.BookmarkColumns.BOOKMARK + " = 0";
                Cursor c = mResolver.query(Browser.BOOKMARKS_URI,
                    Browser.HISTORY_PROJECTION, where, selArgs, null);
                if (c.moveToFirst()) {
                    // Current implementation of database only has one entry per
                    // url.
                    ContentValues map = new ContentValues();
                    map.put(Browser.BookmarkColumns.TITLE, title);
                    mResolver.update(Browser.BOOKMARKS_URI, map,
                            "_id = " + c.getInt(0), null);
                }
                c.close();
            } catch (IllegalStateException e) {
                Log.e(LOGTAG, "BrowserActivity onReceived title", e);
            } catch (SQLiteException ex) {
                Log.e(LOGTAG, "onReceivedTitle() caught SQLiteException: ", ex);
            }
        }

        @Override
        public void onReceivedIcon(WebView view, Bitmap icon) {
            updateIcon(view, icon);
        }

        @Override
        public void onReceivedTouchIconUrl(WebView view, String url) {
            final ContentResolver cr = getContentResolver();
            final Cursor c =
                    BrowserBookmarksAdapter.queryBookmarksForUrl(cr,
                            view.getOriginalUrl(), view.getUrl(), true);
            if (c != null) {
                if (c.getCount() > 0) {
                    new DownloadTouchIcon(cr, c, view).execute(url);
                } else {
                    c.close();
                }
            }
        }

        @Override
        public void onShowCustomView(View view, WebChromeClient.CustomViewCallback callback) {
            if (mCustomView != null)
                return;

            // Add the custom view to its container.
            mCustomViewContainer.addView(view, COVER_SCREEN_GRAVITY_CENTER);
            mCustomView = view;
            mCustomViewCallback = callback;
            // Save the menu state and set it to empty while the custom
            // view is showing.
            mOldMenuState = mMenuState;
            mMenuState = EMPTY_MENU;
            // Hide the content view.
            mContentView.setVisibility(View.GONE);
            // Finally show the custom view container.
            mCustomViewContainer.setVisibility(View.VISIBLE);
            mCustomViewContainer.bringToFront();
        }

        @Override
        public void onHideCustomView() {
            if (mCustomView == null)
                return;

            // Hide the custom view.
            mCustomView.setVisibility(View.GONE);
            // Remove the custom view from its container.
            mCustomViewContainer.removeView(mCustomView);
            mCustomView = null;
            // Reset the old menu state.
            mMenuState = mOldMenuState;
            mOldMenuState = EMPTY_MENU;
            mCustomViewContainer.setVisibility(View.GONE);
            mCustomViewCallback.onCustomViewHidden();
            // Show the content view.
            mContentView.setVisibility(View.VISIBLE);
        }

        /**
         * The origin has exceeded its database quota.
         * @param url the URL that exceeded the quota
         * @param databaseIdentifier the identifier of the database on
         *     which the transaction that caused the quota overflow was run
         * @param currentQuota the current quota for the origin.
         * @param estimatedSize the estimated size of the database.
         * @param totalUsedQuota is the sum of all origins' quota.
         * @param quotaUpdater The callback to run when a decision to allow or
         *     deny quota has been made. Don't forget to call this!
         */
        @Override
        public void onExceededDatabaseQuota(String url,
            String databaseIdentifier, long currentQuota, long estimatedSize,
            long totalUsedQuota, WebStorage.QuotaUpdater quotaUpdater) {
            mSettings.getWebStorageSizeManager().onExceededDatabaseQuota(
                    url, databaseIdentifier, currentQuota, estimatedSize,
                    totalUsedQuota, quotaUpdater);
        }

        /**
         * The Application Cache has exceeded its max size.
         * @param spaceNeeded is the amount of disk space that would be needed
         * in order for the last appcache operation to succeed.
         * @param totalUsedQuota is the sum of all origins' quota.
         * @param quotaUpdater A callback to inform the WebCore thread that a new
         * app cache size is available. This callback must always be executed at
         * some point to ensure that the sleeping WebCore thread is woken up.
         */
        @Override
        public void onReachedMaxAppCacheSize(long spaceNeeded,
                long totalUsedQuota, WebStorage.QuotaUpdater quotaUpdater) {
            mSettings.getWebStorageSizeManager().onReachedMaxAppCacheSize(
                    spaceNeeded, totalUsedQuota, quotaUpdater);
        }

        /**
         * Instructs the browser to show a prompt to ask the user to set the
         * Geolocation permission state for the specified origin.
         * @param origin The origin for which Geolocation permissions are
         *     requested.
         * @param callback The callback to call once the user has set the
         *     Geolocation permission state.
         */
        @Override
        public void onGeolocationPermissionsShowPrompt(String origin,
                GeolocationPermissions.Callback callback) {
            mTabControl.getCurrentTab().getGeolocationPermissionsPrompt().show(
                    origin, callback);
        }

        /**
         * Instructs the browser to hide the Geolocation permissions prompt.
         */
        @Override
        public void onGeolocationPermissionsHidePrompt() {
            mTabControl.getCurrentTab().getGeolocationPermissionsPrompt().hide();
        }

        /* Adds a JavaScript error message to the system log.
         * @param message The error message to report.
         * @param lineNumber The line number of the error.
         * @param sourceID The name of the source file that caused the error.
         */
        @Override
        public void addMessageToConsole(String message, int lineNumber, String sourceID) {
            ErrorConsoleView errorConsole = mTabControl.getCurrentErrorConsole(true);
            errorConsole.addErrorMessage(message, sourceID, lineNumber);
                if (mShouldShowErrorConsole &&
                        errorConsole.getShowState() != ErrorConsoleView.SHOW_MAXIMIZED) {
                    errorConsole.showConsole(ErrorConsoleView.SHOW_MINIMIZED);
                }
            Log.w(LOGTAG, "Console: " + message + " " + sourceID + ":" + lineNumber);
        }
    };

    /**
     * Notify the host application a download should be done, or that
     * the data should be streamed if a streaming viewer is available.
     * @param url The full url to the content that should be downloaded
     * @param contentDisposition Content-disposition http header, if
     *                           present.
     * @param mimetype The mimetype of the content reported by the server
     * @param contentLength The file size reported by the server
     */
    public void onDownloadStart(String url, String userAgent,
            String contentDisposition, String mimetype, long contentLength) {
        // if we're dealing wih A/V content that's not explicitly marked
        //     for download, check if it's streamable.
        if (contentDisposition == null
                || !contentDisposition.regionMatches(
                        true, 0, "attachment", 0, 10)) {
            // query the package manager to see if there's a registered handler
            //     that matches.
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.parse(url), mimetype);
            ResolveInfo info = getPackageManager().resolveActivity(intent,
                    PackageManager.MATCH_DEFAULT_ONLY);
            if (info != null) {
                ComponentName myName = getComponentName();
                // If we resolved to ourselves, we don't want to attempt to
                // load the url only to try and download it again.
                if (!myName.getPackageName().equals(
                        info.activityInfo.packageName)
                        || !myName.getClassName().equals(
                                info.activityInfo.name)) {
                    // someone (other than us) knows how to handle this mime
                    // type with this scheme, don't download.
                    try {
                        startActivity(intent);
                        return;
                    } catch (ActivityNotFoundException ex) {
                        if (LOGD_ENABLED) {
                            Log.d(LOGTAG, "activity not found for " + mimetype
                                    + " over " + Uri.parse(url).getScheme(),
                                    ex);
                        }
                        // Best behavior is to fall back to a download in this
                        // case
                    }
                }
            }
        }
        onDownloadStartNoStream(url, userAgent, contentDisposition, mimetype, contentLength);
    }

    /**
     * Notify the host application a download should be done, even if there
     * is a streaming viewer available for thise type.
     * @param url The full url to the content that should be downloaded
     * @param contentDisposition Content-disposition http header, if
     *                           present.
     * @param mimetype The mimetype of the content reported by the server
     * @param contentLength The file size reported by the server
     */
    /*package */ void onDownloadStartNoStream(String url, String userAgent,
            String contentDisposition, String mimetype, long contentLength) {

        String filename = URLUtil.guessFileName(url,
                contentDisposition, mimetype);

        // Check to see if we have an SDCard
        String status = Environment.getExternalStorageState();
        if (!status.equals(Environment.MEDIA_MOUNTED)) {
            int title;
            String msg;

            // Check to see if the SDCard is busy, same as the music app
            if (status.equals(Environment.MEDIA_SHARED)) {
                msg = getString(R.string.download_sdcard_busy_dlg_msg);
                title = R.string.download_sdcard_busy_dlg_title;
            } else {
                msg = getString(R.string.download_no_sdcard_dlg_msg, filename);
                title = R.string.download_no_sdcard_dlg_title;
            }

            new AlertDialog.Builder(this)
                .setTitle(title)
                .setIcon(android.R.drawable.ic_dialog_alert)
                .setMessage(msg)
                .setPositiveButton(R.string.ok, null)
                .show();
            return;
        }

        // java.net.URI is a lot stricter than KURL so we have to undo
        // KURL's percent-encoding and redo the encoding using java.net.URI.
        URI uri = null;
        try {
            // Undo the percent-encoding that KURL may have done.
            String newUrl = new String(URLUtil.decode(url.getBytes()));
            // Parse the url into pieces
            WebAddress w = new WebAddress(newUrl);
            String frag = null;
            String query = null;
            String path = w.mPath;
            // Break the path into path, query, and fragment
            if (path.length() > 0) {
                // Strip the fragment
                int idx = path.lastIndexOf('#');
                if (idx != -1) {
                    frag = path.substring(idx + 1);
                    path = path.substring(0, idx);
                }
                idx = path.lastIndexOf('?');
                if (idx != -1) {
                    query = path.substring(idx + 1);
                    path = path.substring(0, idx);
                }
            }
            uri = new URI(w.mScheme, w.mAuthInfo, w.mHost, w.mPort, path,
                    query, frag);
        } catch (Exception e) {
            Log.e(LOGTAG, "Could not parse url for download: " + url, e);
            return;
        }

        // XXX: Have to use the old url since the cookies were stored using the
        // old percent-encoded url.
        String cookies = CookieManager.getInstance().getCookie(url);

        ContentValues values = new ContentValues();
        values.put(Downloads.COLUMN_URI, uri.toString());
        values.put(Downloads.COLUMN_COOKIE_DATA, cookies);
        values.put(Downloads.COLUMN_USER_AGENT, userAgent);
        values.put(Downloads.COLUMN_NOTIFICATION_PACKAGE,
                getPackageName());
        values.put(Downloads.COLUMN_NOTIFICATION_CLASS,
                BrowserDownloadPage.class.getCanonicalName());
        values.put(Downloads.COLUMN_VISIBILITY, Downloads.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        values.put(Downloads.COLUMN_MIME_TYPE, mimetype);
        values.put(Downloads.COLUMN_FILE_NAME_HINT, filename);
        values.put(Downloads.COLUMN_DESCRIPTION, uri.getHost());
        if (contentLength > 0) {
            values.put(Downloads.COLUMN_TOTAL_BYTES, contentLength);
        }
        if (mimetype == null) {
            // We must have long pressed on a link or image to download it. We
            // are not sure of the mimetype in this case, so do a head request
            new FetchUrlMimeType(this).execute(values);
        } else {
            final Uri contentUri =
                    getContentResolver().insert(Downloads.CONTENT_URI, values);
            viewDownloads(contentUri);
        }

    }

    /**
     * Resets the lock icon. This method is called when we start a new load and
     * know the url to be loaded.
     */
    private void resetLockIcon(String url) {
        // Save the lock-icon state (we revert to it if the load gets cancelled)
        saveLockIcon();

        mLockIconType = LOCK_ICON_UNSECURE;
        if (URLUtil.isHttpsUrl(url)) {
            mLockIconType = LOCK_ICON_SECURE;
            if (LOGV_ENABLED) {
                Log.v(LOGTAG, "BrowserActivity.resetLockIcon:" +
                      " reset lock icon to " + mLockIconType);
            }
        }

        updateLockIconImage(LOCK_ICON_UNSECURE);
    }

    /**
     * Resets the lock icon.  This method is called when the icon needs to be
     * reset but we do not know whether we are loading a secure or not secure
     * page.
     */
    private void resetLockIcon() {
        // Save the lock-icon state (we revert to it if the load gets cancelled)
        saveLockIcon();

        mLockIconType = LOCK_ICON_UNSECURE;

        if (LOGV_ENABLED) {
          Log.v(LOGTAG, "BrowserActivity.resetLockIcon:" +
                " reset lock icon to " + mLockIconType);
        }

        updateLockIconImage(LOCK_ICON_UNSECURE);
    }

    /**
     * Update the lock icon to correspond to our latest state.
     */
    /* package */ void updateLockIconToLatest() {
        updateLockIconImage(mLockIconType);
    }

    /**
     * Updates the lock-icon image in the title-bar.
     */
    private void updateLockIconImage(int lockIconType) {
        Drawable d = null;
        if (lockIconType == LOCK_ICON_SECURE) {
            d = mSecLockIcon;
        } else if (lockIconType == LOCK_ICON_MIXED) {
            d = mMixLockIcon;
        }
        mTitleBar.setLock(d, getTopWindow());
        if (mFakeTitleBar != null) {
            mFakeTitleBar.setLock(d);
        }
    }

    /**
     * Displays a page-info dialog.
     * @param tab The tab to show info about
     * @param fromShowSSLCertificateOnError The flag that indicates whether
     * this dialog was opened from the SSL-certificate-on-error dialog or
     * not. This is important, since we need to know whether to return to
     * the parent dialog or simply dismiss.
     */
    private void showPageInfo(final TabControl.Tab tab,
                              final boolean fromShowSSLCertificateOnError) {
        final LayoutInflater factory = LayoutInflater
                .from(this);

        final View pageInfoView = factory.inflate(R.layout.page_info, null);

        final WebView view = tab.getWebView();

        String url = null;
        String title = null;

        if (view == null) {
            url = tab.getUrl();
            title = tab.getTitle();
        } else if (view == mTabControl.getCurrentWebView()) {
             // Use the cached title and url if this is the current WebView
            url = mUrl;
            title = mTitle;
        } else {
            url = view.getUrl();
            title = view.getTitle();
        }

        if (url == null) {
            url = "";
        }
        if (title == null) {
            title = "";
        }

        ((TextView) pageInfoView.findViewById(R.id.address)).setText(url);
        ((TextView) pageInfoView.findViewById(R.id.title)).setText(title);

        mPageInfoView = tab;
        mPageInfoFromShowSSLCertificateOnError = new Boolean(fromShowSSLCertificateOnError);

        AlertDialog.Builder alertDialogBuilder =
            new AlertDialog.Builder(this)
            .setTitle(R.string.page_info).setIcon(android.R.drawable.ic_dialog_info)
            .setView(pageInfoView)
            .setPositiveButton(
                R.string.ok,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,
                                        int whichButton) {
                        mPageInfoDialog = null;
                        mPageInfoView = null;
                        mPageInfoFromShowSSLCertificateOnError = null;

                        // if we came here from the SSL error dialog
                        if (fromShowSSLCertificateOnError) {
                            // go back to the SSL error dialog
                            showSSLCertificateOnError(
                                mSSLCertificateOnErrorView,
                                mSSLCertificateOnErrorHandler,
                                mSSLCertificateOnErrorError);
                        }
                    }
                })
            .setOnCancelListener(
                new DialogInterface.OnCancelListener() {
                    public void onCancel(DialogInterface dialog) {
                        mPageInfoDialog = null;
                        mPageInfoView = null;
                        mPageInfoFromShowSSLCertificateOnError = null;

                        // if we came here from the SSL error dialog
                        if (fromShowSSLCertificateOnError) {
                            // go back to the SSL error dialog
                            showSSLCertificateOnError(
                                mSSLCertificateOnErrorView,
                                mSSLCertificateOnErrorHandler,
                                mSSLCertificateOnErrorError);
                        }
                    }
                });

        // if we have a main top-level page SSL certificate set or a certificate
        // error
        if (fromShowSSLCertificateOnError ||
                (view != null && view.getCertificate() != null)) {
            // add a 'View Certificate' button
            alertDialogBuilder.setNeutralButton(
                R.string.view_certificate,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,
                                        int whichButton) {
                        mPageInfoDialog = null;
                        mPageInfoView = null;
                        mPageInfoFromShowSSLCertificateOnError = null;

                        // if we came here from the SSL error dialog
                        if (fromShowSSLCertificateOnError) {
                            // go back to the SSL error dialog
                            showSSLCertificateOnError(
                                mSSLCertificateOnErrorView,
                                mSSLCertificateOnErrorHandler,
                                mSSLCertificateOnErrorError);
                        } else {
                            // otherwise, display the top-most certificate from
                            // the chain
                            if (view.getCertificate() != null) {
                                showSSLCertificate(tab);
                            }
                        }
                    }
                });
        }

        mPageInfoDialog = alertDialogBuilder.show();
    }

       /**
     * Displays the main top-level page SSL certificate dialog
     * (accessible from the Page-Info dialog).
     * @param tab The tab to show certificate for.
     */
    private void showSSLCertificate(final TabControl.Tab tab) {
        final View certificateView =
                inflateCertificateView(tab.getWebView().getCertificate());
        if (certificateView == null) {
            return;
        }

        LayoutInflater factory = LayoutInflater.from(this);

        final LinearLayout placeholder =
                (LinearLayout)certificateView.findViewById(R.id.placeholder);

        LinearLayout ll = (LinearLayout) factory.inflate(
            R.layout.ssl_success, placeholder);
        ((TextView)ll.findViewById(R.id.success))
            .setText(R.string.ssl_certificate_is_valid);

        mSSLCertificateView = tab;
        mSSLCertificateDialog =
            new AlertDialog.Builder(this)
                .setTitle(R.string.ssl_certificate).setIcon(
                    R.drawable.ic_dialog_browser_certificate_secure)
                .setView(certificateView)
                .setPositiveButton(R.string.ok,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                    int whichButton) {
                                mSSLCertificateDialog = null;
                                mSSLCertificateView = null;

                                showPageInfo(tab, false);
                            }
                        })
                .setOnCancelListener(
                        new DialogInterface.OnCancelListener() {
                            public void onCancel(DialogInterface dialog) {
                                mSSLCertificateDialog = null;
                                mSSLCertificateView = null;

                                showPageInfo(tab, false);
                            }
                        })
                .show();
    }

    /**
     * Displays the SSL error certificate dialog.
     * @param view The target web-view.
     * @param handler The SSL error handler responsible for cancelling the
     * connection that resulted in an SSL error or proceeding per user request.
     * @param error The SSL error object.
     */
    private void showSSLCertificateOnError(
        final WebView view, final SslErrorHandler handler, final SslError error) {

        final View certificateView =
            inflateCertificateView(error.getCertificate());
        if (certificateView == null) {
            return;
        }

        LayoutInflater factory = LayoutInflater.from(this);

        final LinearLayout placeholder =
                (LinearLayout)certificateView.findViewById(R.id.placeholder);

        if (error.hasError(SslError.SSL_UNTRUSTED)) {
            LinearLayout ll = (LinearLayout)factory
                .inflate(R.layout.ssl_warning, placeholder);
            ((TextView)ll.findViewById(R.id.warning))
                .setText(R.string.ssl_untrusted);
        }

        if (error.hasError(SslError.SSL_IDMISMATCH)) {
            LinearLayout ll = (LinearLayout)factory
                .inflate(R.layout.ssl_warning, placeholder);
            ((TextView)ll.findViewById(R.id.warning))
                .setText(R.string.ssl_mismatch);
        }

        if (error.hasError(SslError.SSL_EXPIRED)) {
            LinearLayout ll = (LinearLayout)factory
                .inflate(R.layout.ssl_warning, placeholder);
            ((TextView)ll.findViewById(R.id.warning))
                .setText(R.string.ssl_expired);
        }

        if (error.hasError(SslError.SSL_NOTYETVALID)) {
            LinearLayout ll = (LinearLayout)factory
                .inflate(R.layout.ssl_warning, placeholder);
            ((TextView)ll.findViewById(R.id.warning))
                .setText(R.string.ssl_not_yet_valid);
        }

        mSSLCertificateOnErrorHandler = handler;
        mSSLCertificateOnErrorView = view;
        mSSLCertificateOnErrorError = error;
        mSSLCertificateOnErrorDialog =
            new AlertDialog.Builder(this)
                .setTitle(R.string.ssl_certificate).setIcon(
                    R.drawable.ic_dialog_browser_certificate_partially_secure)
                .setView(certificateView)
                .setPositiveButton(R.string.ok,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                    int whichButton) {
                                mSSLCertificateOnErrorDialog = null;
                                mSSLCertificateOnErrorView = null;
                                mSSLCertificateOnErrorHandler = null;
                                mSSLCertificateOnErrorError = null;

                                mWebViewClient.onReceivedSslError(
                                    view, handler, error);
                            }
                        })
                 .setNeutralButton(R.string.page_info_view,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                    int whichButton) {
                                mSSLCertificateOnErrorDialog = null;

                                // do not clear the dialog state: we will
                                // need to show the dialog again once the
                                // user is done exploring the page-info details

                                showPageInfo(mTabControl.getTabFromView(view),
                                        true);
                            }
                        })
                .setOnCancelListener(
                        new DialogInterface.OnCancelListener() {
                            public void onCancel(DialogInterface dialog) {
                                mSSLCertificateOnErrorDialog = null;
                                mSSLCertificateOnErrorView = null;
                                mSSLCertificateOnErrorHandler = null;
                                mSSLCertificateOnErrorError = null;

                                mWebViewClient.onReceivedSslError(
                                    view, handler, error);
                            }
                        })
                .show();
    }

    /**
     * Inflates the SSL certificate view (helper method).
     * @param certificate The SSL certificate.
     * @return The resultant certificate view with issued-to, issued-by,
     * issued-on, expires-on, and possibly other fields set.
     * If the input certificate is null, returns null.
     */
    private View inflateCertificateView(SslCertificate certificate) {
        if (certificate == null) {
            return null;
        }

        LayoutInflater factory = LayoutInflater.from(this);

        View certificateView = factory.inflate(
            R.layout.ssl_certificate, null);

        // issued to:
        SslCertificate.DName issuedTo = certificate.getIssuedTo();
        if (issuedTo != null) {
            ((TextView) certificateView.findViewById(R.id.to_common))
                .setText(issuedTo.getCName());
            ((TextView) certificateView.findViewById(R.id.to_org))
                .setText(issuedTo.getOName());
            ((TextView) certificateView.findViewById(R.id.to_org_unit))
                .setText(issuedTo.getUName());
        }

        // issued by:
        SslCertificate.DName issuedBy = certificate.getIssuedBy();
        if (issuedBy != null) {
            ((TextView) certificateView.findViewById(R.id.by_common))
                .setText(issuedBy.getCName());
            ((TextView) certificateView.findViewById(R.id.by_org))
                .setText(issuedBy.getOName());
            ((TextView) certificateView.findViewById(R.id.by_org_unit))
                .setText(issuedBy.getUName());
        }

        // issued on:
        String issuedOn = reformatCertificateDate(
            certificate.getValidNotBefore());
        ((TextView) certificateView.findViewById(R.id.issued_on))
            .setText(issuedOn);

        // expires on:
        String expiresOn = reformatCertificateDate(
            certificate.getValidNotAfter());
        ((TextView) certificateView.findViewById(R.id.expires_on))
            .setText(expiresOn);

        return certificateView;
    }

    /**
     * Re-formats the certificate date (Date.toString()) string to
     * a properly localized date string.
     * @return Properly localized version of the certificate date string and
     * the original certificate date string if fails to localize.
     * If the original string is null, returns an empty string "".
     */
    private String reformatCertificateDate(String certificateDate) {
      String reformattedDate = null;

      if (certificateDate != null) {
          Date date = null;
          try {
              date = java.text.DateFormat.getInstance().parse(certificateDate);
          } catch (ParseException e) {
              date = null;
          }

          if (date != null) {
              reformattedDate =
                  DateFormat.getDateFormat(this).format(date);
          }
      }

      return reformattedDate != null ? reformattedDate :
          (certificateDate != null ? certificateDate : "");
    }

    /**
     * Displays an http-authentication dialog.
     */
    private void showHttpAuthentication(final HttpAuthHandler handler,
            final String host, final String realm, final String title,
            final String name, final String password, int focusId) {
        LayoutInflater factory = LayoutInflater.from(this);
        final View v = factory
                .inflate(R.layout.http_authentication, null);
        if (name != null) {
            ((EditText) v.findViewById(R.id.username_edit)).setText(name);
        }
        if (password != null) {
            ((EditText) v.findViewById(R.id.password_edit)).setText(password);
        }

        String titleText = title;
        if (titleText == null) {
            titleText = getText(R.string.sign_in_to).toString().replace(
                    "%s1", host).replace("%s2", realm);
        }

        mHttpAuthHandler = handler;
        AlertDialog dialog = new AlertDialog.Builder(this)
                .setTitle(titleText)
                .setIcon(android.R.drawable.ic_dialog_alert)
                .setView(v)
                .setPositiveButton(R.string.action,
                        new DialogInterface.OnClickListener() {
                             public void onClick(DialogInterface dialog,
                                     int whichButton) {
                                String nm = ((EditText) v
                                        .findViewById(R.id.username_edit))
                                        .getText().toString();
                                String pw = ((EditText) v
                                        .findViewById(R.id.password_edit))
                                        .getText().toString();
                                BrowserActivity.this.setHttpAuthUsernamePassword
                                        (host, realm, nm, pw);
                                handler.proceed(nm, pw);
                                mHttpAuthenticationDialog = null;
                                mHttpAuthHandler = null;
                            }})
                .setNegativeButton(R.string.cancel,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                    int whichButton) {
                                handler.cancel();
                                BrowserActivity.this.resetTitleAndRevertLockIcon();
                                mHttpAuthenticationDialog = null;
                                mHttpAuthHandler = null;
                            }})
                .setOnCancelListener(new DialogInterface.OnCancelListener() {
                        public void onCancel(DialogInterface dialog) {
                            handler.cancel();
                            BrowserActivity.this.resetTitleAndRevertLockIcon();
                            mHttpAuthenticationDialog = null;
                            mHttpAuthHandler = null;
                        }})
                .create();
        // Make the IME appear when the dialog is displayed if applicable.
        dialog.getWindow().setSoftInputMode(
                WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
        dialog.show();
        if (focusId != 0) {
            dialog.findViewById(focusId).requestFocus();
        } else {
            v.findViewById(R.id.username_edit).requestFocus();
        }
        mHttpAuthenticationDialog = dialog;
    }

    public int getProgress() {
        WebView w = mTabControl.getCurrentWebView();
        if (w != null) {
            return w.getProgress();
        } else {
            return 100;
        }
    }

    /**
     * Set HTTP authentication password.
     *
     * @param host The host for the password
     * @param realm The realm for the password
     * @param username The username for the password. If it is null, it means
     *            password can't be saved.
     * @param password The password
     */
    public void setHttpAuthUsernamePassword(String host, String realm,
                                            String username,
                                            String password) {
        WebView w = mTabControl.getCurrentWebView();
        if (w != null) {
            w.setHttpAuthUsernamePassword(host, realm, username, password);
        }
    }

    /**
     * connectivity manager says net has come or gone... inform the user
     * @param up true if net has come up, false if net has gone down
     */
    public void onNetworkToggle(boolean up) {
        if (up == mIsNetworkUp) {
            return;
        } else if (up) {
            mIsNetworkUp = true;
            if (mAlertDialog != null) {
                mAlertDialog.cancel();
                mAlertDialog = null;
            }
        } else {
            mIsNetworkUp = false;
            if (mInLoad && mAlertDialog == null) {
                mAlertDialog = new AlertDialog.Builder(this)
                        .setTitle(R.string.loadSuspendedTitle)
                        .setMessage(R.string.loadSuspended)
                        .setPositiveButton(R.string.ok, null)
                        .show();
            }
        }
        WebView w = mTabControl.getCurrentWebView();
        if (w != null) {
            w.setNetworkAvailable(up);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode,
                                    Intent intent) {
        switch (requestCode) {
            case COMBO_PAGE:
                if (resultCode == RESULT_OK && intent != null) {
                    String data = intent.getAction();
                    Bundle extras = intent.getExtras();
                    if (extras != null && extras.getBoolean("new_window", false)) {
                        final TabControl.Tab newTab = openTab(data);
                        if (mSettings.openInBackground() &&
                                newTab != null) {
                            mTabControl.populatePickerData(newTab);
                            mTabControl.setCurrentTab(newTab);
                            int newIndex = mTabControl.getCurrentIndex();
                            mTitleBar.setCurrentTab(newIndex);
                        }
                    } else {
                        final TabControl.Tab currentTab =
                                mTabControl.getCurrentTab();
                        dismissSubWindow(currentTab);
                        if (data != null && data.length() != 0) {
                            getTopWindow().loadUrl(data);
                        }
                    }
                }
                break;
            default:
                break;
        }
        getTopWindow().requestFocus();
    }

    /*
     * This method is called as a result of the user selecting the options
     * menu to see the download window, or when a download changes state. It
     * shows the download window ontop of the current window.
     */
    /* package */ void viewDownloads(Uri downloadRecord) {
        Intent intent = new Intent(this,
                BrowserDownloadPage.class);
        intent.setData(downloadRecord);
        startActivityForResult(intent, this.DOWNLOAD_PAGE);

    }

    /**
     * Open the Go page.
     * @param startWithHistory If true, open starting on the history tab.
     *                         Otherwise, start with the bookmarks tab.
     */
    /* package */ void bookmarksOrHistoryPicker(boolean startWithHistory) {
        WebView current = mTabControl.getCurrentWebView();
        if (current == null) {
            return;
        }
        Intent intent = new Intent(this,
                CombinedBookmarkHistoryActivity.class);
        String title = current.getTitle();
        String url = current.getUrl();
        // Just in case the user opens bookmarks before a page finishes loading
        // so the current history item, and therefore the page, is null.
        if (null == url) {
            url = mLastEnteredUrl;
            // This can happen.
            if (null == url) {
                url = mSettings.getHomePage();
            }
        }
        // In case the web page has not yet received its associated title.
        if (title == null) {
            title = url;
        }
        intent.putExtra("title", title);
        intent.putExtra("url", url);
        // Disable opening in a new window if we have maxed out the windows
        intent.putExtra("disable_new_window", mTabControl.getTabCount()
                >= TabControl.MAX_TABS);
        intent.putExtra("touch_icon_url", current.getTouchIconUrl());
        if (startWithHistory) {
            intent.putExtra(CombinedBookmarkHistoryActivity.STARTING_TAB,
                    CombinedBookmarkHistoryActivity.HISTORY_TAB);
        }
        startActivityForResult(intent, COMBO_PAGE);
    }

    // Called when loading from context menu or LOAD_URL message
    private void loadURL(WebView view, String url) {
        // In case the user enters nothing.
        if (url != null && url.length() != 0 && view != null) {
            url = smartUrlFilter(url);
            if (!mWebViewClient.shouldOverrideUrlLoading(view, url)) {
                view.loadUrl(url);
            }
        }
    }

    private String smartUrlFilter(Uri inUri) {
        if (inUri != null) {
            return smartUrlFilter(inUri.toString());
        }
        return null;
    }


    // get window count

    int getWindowCount(){
      if(mTabControl != null){
        return mTabControl.getTabCount();
      }
      return 0;
    }

    protected static final Pattern ACCEPTED_URI_SCHEMA = Pattern.compile(
            "(?i)" + // switch on case insensitive matching
            "(" +    // begin group for schema
            "(?:http|https|file):\\/\\/" +
            "|(?:inline|data|about|content|javascript):" +
            ")" +
            "(.*)" );

    /**
     * Attempts to determine whether user input is a URL or search
     * terms.  Anything with a space is passed to search.
     *
     * Converts to lowercase any mistakenly uppercased schema (i.e.,
     * "Http://" converts to "http://"
     *
     * @return Original or modified URL
     *
     */
    String smartUrlFilter(String url) {

        String inUrl = url.trim();
        boolean hasSpace = inUrl.indexOf(' ') != -1;

        Matcher matcher = ACCEPTED_URI_SCHEMA.matcher(inUrl);
        if (matcher.matches()) {
            // force scheme to lowercase
            String scheme = matcher.group(1);
            String lcScheme = scheme.toLowerCase();
            if (!lcScheme.equals(scheme)) {
                inUrl = lcScheme + matcher.group(2);
            }
            if (hasSpace) {
                inUrl = inUrl.replace(" ", "%20");
            }
            return inUrl;
        }
        if (hasSpace) {
            // FIXME: Is this the correct place to add to searches?
            // what if someone else calls this function?
            int shortcut = parseUrlShortcut(inUrl);
            if (shortcut != SHORTCUT_INVALID) {
                Browser.addSearchUrl(mResolver, inUrl);
                String query = inUrl.substring(2);
                switch (shortcut) {
                case SHORTCUT_GOOGLE_SEARCH:
                    return URLUtil.composeSearchUrl(query, QuickSearch_G, QUERY_PLACE_HOLDER);
                case SHORTCUT_WIKIPEDIA_SEARCH:
                    return URLUtil.composeSearchUrl(query, QuickSearch_W, QUERY_PLACE_HOLDER);
                case SHORTCUT_DICTIONARY_SEARCH:
                    return URLUtil.composeSearchUrl(query, QuickSearch_D, QUERY_PLACE_HOLDER);
                case SHORTCUT_GOOGLE_MOBILE_LOCAL_SEARCH:
                    // FIXME: we need location in this case
                    return URLUtil.composeSearchUrl(query, QuickSearch_L, QUERY_PLACE_HOLDER);
                }
            }
        } else {
            if (Regex.WEB_URL_PATTERN.matcher(inUrl).matches()) {
                return URLUtil.guessUrl(inUrl);
            }
        }

        Browser.addSearchUrl(mResolver, inUrl);
        return URLUtil.composeSearchUrl(inUrl, QuickSearch_G, QUERY_PLACE_HOLDER);
    }

    /* package */ void setShouldShowErrorConsole(boolean flag) {
        if (flag == mShouldShowErrorConsole) {
            // Nothing to do.
            return;
        }

        mShouldShowErrorConsole = flag;

        ErrorConsoleView errorConsole = mTabControl.getCurrentErrorConsole(true);

        if (flag) {
            // Setting the show state of the console will cause it's the layout to be inflated.
            if (errorConsole.numberOfErrors() > 0) {
                errorConsole.showConsole(ErrorConsoleView.SHOW_MINIMIZED);
            } else {
                errorConsole.showConsole(ErrorConsoleView.SHOW_NONE);
            }

            // Now we can add it to the main view.
            mErrorConsoleContainer.addView(errorConsole,
                    new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                                                  ViewGroup.LayoutParams.WRAP_CONTENT));
        } else {
            mErrorConsoleContainer.removeView(errorConsole);
        }

    }

    private final static int LOCK_ICON_UNSECURE = 0;
    private final static int LOCK_ICON_SECURE   = 1;
    private final static int LOCK_ICON_MIXED    = 2;

    private int mLockIconType = LOCK_ICON_UNSECURE;
    private int mPrevLockType = LOCK_ICON_UNSECURE;

    private BrowserSettings mSettings;
    private TabControl      mTabControl;
    private ContentResolver mResolver;
    private FrameLayout     mContentView;
    private View            mCustomView;
    private FrameLayout     mCustomViewContainer;
    private WebChromeClient.CustomViewCallback mCustomViewCallback;

    // FIXME, temp address onPrepareMenu performance problem. When we move everything out of
    // view, we should rewrite this.
    private int mCurrentMenuState = 0;
    private int mMenuState = R.id.MAIN_MENU;
    private int mOldMenuState = EMPTY_MENU;
    private static final int EMPTY_MENU = -1;
    private Menu mMenu;

    private FindDialog mFindDialog;
    // Used to prevent chording to result in firing two shortcuts immediately
    // one after another.  Fixes bug 1211714.
    boolean mCanChord;

    private boolean mInLoad;
    private boolean mIsNetworkUp;

    private boolean mPageStarted;
    private boolean mActivityInPause = true;

    private boolean mMenuIsDown;

    private final KeyTracker mKeyTracker = new KeyTracker(this);

    // As trackball doesn't send repeat down, we have to track it ourselves
    private boolean mTrackTrackball;

    private static boolean mInTrace;

    // Performance probe
    private static final int[] SYSTEM_CPU_FORMAT = new int[] {
            Process.PROC_SPACE_TERM | Process.PROC_COMBINE,
            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 1: user time
            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 2: nice time
            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 3: sys time
            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 4: idle time
            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 5: iowait time
            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 6: irq time
            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG  // 7: softirq time
    };

    private long mStart;
    private long mProcessStart;
    private long mUserStart;
    private long mSystemStart;
    private long mIdleStart;
    private long mIrqStart;

    private long mUiStart;

    private Drawable    mMixLockIcon;
    private Drawable    mSecLockIcon;

    /* hold a ref so we can auto-cancel if necessary */
    private AlertDialog mAlertDialog;

    // Wait for credentials before loading google.com
    private ProgressDialog mCredsDlg;

    // The up-to-date URL and title (these can be different from those stored
    // in WebView, since it takes some time for the information in WebView to
    // get updated)
    private String mUrl;
    private String mTitle;

    // As PageInfo has different style for landscape / portrait, we have
    // to re-open it when configuration changed
    private AlertDialog mPageInfoDialog;
    private TabControl.Tab mPageInfoView;
    // If the Page-Info dialog is launched from the SSL-certificate-on-error
    // dialog, we should not just dismiss it, but should get back to the
    // SSL-certificate-on-error dialog. This flag is used to store this state
    private Boolean mPageInfoFromShowSSLCertificateOnError;

    // as SSLCertificateOnError has different style for landscape / portrait,
    // we have to re-open it when configuration changed
    private AlertDialog mSSLCertificateOnErrorDialog;
    private WebView mSSLCertificateOnErrorView;
    private SslErrorHandler mSSLCertificateOnErrorHandler;
    private SslError mSSLCertificateOnErrorError;

    // as SSLCertificate has different style for landscape / portrait, we
    // have to re-open it when configuration changed
    private AlertDialog mSSLCertificateDialog;
    private TabControl.Tab mSSLCertificateView;

    // as HttpAuthentication has different style for landscape / portrait, we
    // have to re-open it when configuration changed
    private AlertDialog mHttpAuthenticationDialog;
    private HttpAuthHandler mHttpAuthHandler;

    /*package*/ static final FrameLayout.LayoutParams COVER_SCREEN_PARAMS =
                                            new FrameLayout.LayoutParams(
                                            ViewGroup.LayoutParams.FILL_PARENT,
                                            ViewGroup.LayoutParams.FILL_PARENT);
    /*package*/ static final FrameLayout.LayoutParams COVER_SCREEN_GRAVITY_CENTER =
                                            new FrameLayout.LayoutParams(
                                            ViewGroup.LayoutParams.FILL_PARENT,
                                            ViewGroup.LayoutParams.FILL_PARENT,
                                            Gravity.CENTER);
    // Google search
    final static String QuickSearch_G = "http://www.google.com/m?q=%s";
    // Wikipedia search
    final static String QuickSearch_W = "http://en.wikipedia.org/w/index.php?search=%s&go=Go";
    // Dictionary search
    final static String QuickSearch_D = "http://dictionary.reference.com/search?q=%s";
    // Google Mobile Local search
    final static String QuickSearch_L = "http://www.google.com/m/search?site=local&q=%s&near=mountain+view";

    final static String QUERY_PLACE_HOLDER = "%s";

    // "source" parameter for Google search through search key
    final static String GOOGLE_SEARCH_SOURCE_SEARCHKEY = "browser-key";
    // "source" parameter for Google search through goto menu
    final static String GOOGLE_SEARCH_SOURCE_GOTO = "browser-goto";
    // "source" parameter for Google search through simplily type
    final static String GOOGLE_SEARCH_SOURCE_TYPE = "browser-type";
    // "source" parameter for Google search suggested by the browser
    final static String GOOGLE_SEARCH_SOURCE_SUGGEST = "browser-suggest";
    // "source" parameter for Google search from unknown source
    final static String GOOGLE_SEARCH_SOURCE_UNKNOWN = "unknown";

    private final static String LOGTAG = "browser";

    private String mLastEnteredUrl;

    private PowerManager.WakeLock mWakeLock;
    private final static int WAKELOCK_TIMEOUT = 5 * 60 * 1000; // 5 minutes

    private Toast mStopToast;

    private TitleBarSet mTitleBar;

    private LinearLayout mErrorConsoleContainer = null;
    private boolean mShouldShowErrorConsole = false;

    // As the ids are dynamically created, we can't guarantee that they will
    // be in sequence, so this static array maps ids to a window number.
    final static private int[] WINDOW_SHORTCUT_ID_ARRAY =
    { R.id.window_one_menu_id, R.id.window_two_menu_id, R.id.window_three_menu_id,
      R.id.window_four_menu_id, R.id.window_five_menu_id, R.id.window_six_menu_id,
      R.id.window_seven_menu_id, R.id.window_eight_menu_id };

    // monitor platform changes
    private IntentFilter mNetworkStateChangedFilter;
    private BroadcastReceiver mNetworkStateIntentReceiver;

    private BroadcastReceiver mPackageInstallationReceiver;

    // activity requestCode
    final static int COMBO_PAGE                 = 1;
    final static int DOWNLOAD_PAGE              = 2;
    final static int PREFERENCES_PAGE           = 3;

    /**
     * A UrlData class to abstract how the content will be set to WebView.
     * This base class uses loadUrl to show the content.
     */
    private static class UrlData {
        String mUrl;
        byte[] mPostData;

        UrlData(String url) {
            this.mUrl = url;
        }

        void setPostData(byte[] postData) {
            mPostData = postData;
        }

        boolean isEmpty() {
            return mUrl == null || mUrl.length() == 0;
        }

        public void loadIn(WebView webView) {
            if (mPostData != null) {
                webView.postUrl(mUrl, mPostData);
            } else {
                webView.loadUrl(mUrl);
            }
        }
    };

    /**
     * A subclass of UrlData class that can display inlined content using
     * {@link WebView#loadDataWithBaseURL(String, String, String, String, String)}.
     */
    private static class InlinedUrlData extends UrlData {
        InlinedUrlData(String inlined, String mimeType, String encoding, String failUrl) {
            super(failUrl);
            mInlined = inlined;
            mMimeType = mimeType;
            mEncoding = encoding;
        }
        String mMimeType;
        String mInlined;
        String mEncoding;
        @Override
        boolean isEmpty() {
            return mInlined == null || mInlined.length() == 0 || super.isEmpty();
        }

        @Override
        public void loadIn(WebView webView) {
            webView.loadDataWithBaseURL(null, mInlined, mMimeType, mEncoding, mUrl);
        }
    }

    /* package */ static final UrlData EMPTY_URL_DATA = new UrlData(null);
}