Browser: add save path setting feature and full indicator

1. The saving path can be preseted,
   both the internal storage and the SD card are supported
2. Reminder if the download file size exceed the available
   memory.

CRs-fixed: 507953 507954

Change-Id: Ic2f807cb0ee2408cc6e4455a4c67bab5a0d01a8f
diff --git a/src/com/android/browser/DownloadSettings.java b/src/com/android/browser/DownloadSettings.java
new file mode 100644
index 0000000..c1ddcb6
--- /dev/null
+++ b/src/com/android/browser/DownloadSettings.java
@@ -0,0 +1,312 @@
+/*
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials provided
+ *         with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *         contributors may be used to endorse or promote products derived
+ *         from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.android.browser;
+
+import java.io.File;
+
+import android.app.Activity;
+import android.content.Intent;
+import java.lang.Thread;
+import android.net.Uri;
+import android.os.Bundle;
+import android.text.format.*;
+import android.util.Log;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.view.Window;
+import android.widget.Toast;
+import android.text.TextUtils;
+
+public class DownloadSettings extends Activity {
+
+    private EditText downloadFilenameET;
+    private EditText downloadPathET;
+    private TextView downloadEstimateSize;
+    private TextView downloadEstimateTime;
+    private Button downloadStart;
+    private Button downloadCancel;
+    private String url;
+    private String userAgent;
+    private String contentDisposition;
+    private String mimetype;
+    private String referer;
+    private String filenameBase;
+    private String filename;
+    private String filenameExtension;
+    private boolean privateBrowsing;
+    private long contentLength;
+    private String downloadPath;
+    private String downloadPathForUser;
+    private static final int downloadRate = (1024 * 100 * 60);// Download Rate
+                                                              // 100KB/s
+    private final static String LOGTAG = "DownloadSettings";
+    private final static int DOWNLOAD_PATH = 0;
+    private boolean isDownloadStarted = false;
+
+    private static final String ENV_EMULATED_STORAGE_TARGET = "EMULATED_STORAGE_TARGET";
+
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        // initial the DownloadSettings view
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+        setContentView(R.layout.download_settings);
+        downloadFilenameET = (EditText) findViewById(R.id.download_filename_edit);
+        downloadPathET = (EditText) findViewById(R.id.download_filepath_selected);
+        downloadEstimateSize = (TextView) findViewById(R.id.download_estimate_size_content);
+        downloadEstimateTime = (TextView) findViewById(R.id.download_estimate_time_content);
+        downloadStart = (Button) findViewById(R.id.download_start);
+        downloadCancel = (Button) findViewById(R.id.download_cancle);
+        downloadPathET.setOnClickListener(downloadPathListener);
+        downloadStart.setOnClickListener(downloadStartListener);
+        downloadCancel.setOnClickListener(downloadCancelListener);
+
+        // get the bundle from Intent
+        Intent intent = getIntent();
+        Bundle fileInfo = intent.getExtras();
+        url = fileInfo.getString("url");
+        userAgent = fileInfo.getString("userAgent");
+        contentDisposition = fileInfo.getString("contentDisposition");
+        mimetype = fileInfo.getString("mimetype");
+        referer = fileInfo.getString("referer");
+        contentLength = fileInfo.getLong("contentLength");
+        privateBrowsing = fileInfo.getBoolean("privateBrowsing");
+        filename = fileInfo.getString("filename");
+
+        // download filenamebase's length is depended on filenameLength's values
+        // if filenamebase.length >= flienameLength, destroy the last string!
+
+        filenameBase = DownloadHandler.getFilenameBase(filename);
+        if (filenameBase.length() >= (BrowserUtils.FILENAME_MAX_LENGTH)) {
+            filenameBase = filenameBase.substring(0, BrowserUtils.FILENAME_MAX_LENGTH);
+        }
+
+        // warring when user enter more over letters into the EditText
+        BrowserUtils.maxLengthFilter(DownloadSettings.this, downloadFilenameET,
+                BrowserUtils.FILENAME_MAX_LENGTH);
+
+        downloadFilenameET.setText(filenameBase);
+        downloadPath = BrowserSettings.getInstance().getDownloadPath();
+        downloadPathForUser = DownloadHandler.getDownloadPathForUser(DownloadSettings.this,
+                downloadPath);
+        setDownloadPathForUserText(downloadPathForUser);
+        setDownloadFileSizeText();
+        setDownloadFileTimeText();
+
+    }
+
+    private OnClickListener downloadPathListener = new OnClickListener() {
+
+        @Override
+        public void onClick(View v) {
+
+            // start filemanager for getting download path
+            try {
+                Intent downloadPathIntent = new Intent("com.android.fileexplorer.action.DIR_SEL");
+                DownloadSettings.this.startActivityForResult(downloadPathIntent, DOWNLOAD_PATH);
+            } catch (Exception e) {
+                String err_msg = getString(R.string.activity_not_found,
+                        "com.android.fileexplorer.action.DIR_SEL");
+                Toast.makeText(DownloadSettings.this, err_msg, Toast.LENGTH_LONG).show();
+            }
+
+        }
+    };
+
+    private OnClickListener downloadStartListener = new OnClickListener() {
+
+        @Override
+        public void onClick(View v) {
+            filenameBase = getFilenameBaseFromUserEnter();
+            // check the filename user enter is null or not
+            if (filenameBase.length() <= 0) {
+                DownloadHandler.showFilenameEmptyDialog(DownloadSettings.this);
+                return;
+            }
+
+            filenameExtension = DownloadHandler.getFilenameExtension(filename);
+            filename = filenameBase + "." + filenameExtension;
+
+            // check the storage status
+            if (!DownloadHandler.isStorageStatusOK(DownloadSettings.this, filename, downloadPath)) {
+                return;
+            }
+
+            // check the storage memory enough or not
+            try {
+                DownloadHandler.setAppointedFolder(downloadPath);
+            } catch (Exception e) {
+                DownloadHandler.showNoEnoughMemoryDialog(DownloadSettings.this);
+                return;
+            }
+            boolean isNoEnoughMemory = DownloadHandler.manageNoEnoughMemory(DownloadSettings.this,
+                    contentLength, downloadPath);
+            if (isNoEnoughMemory) {
+                return;
+            }
+
+            // check the download file is exist or not
+            String fullFilename = downloadPath + "/" + filename;
+            if (mimetype != null && new File(fullFilename).exists()) {
+                DownloadHandler.fileExistQueryDialog(DownloadSettings.this);
+                return;
+            }
+
+            // staring downloading
+            DownloadHandler.startingDownload(DownloadSettings.this,
+                    url, userAgent, contentDisposition,
+                    mimetype, referer, privateBrowsing, contentLength,
+                    Uri.encode(filename), downloadPath);
+            isDownloadStarted = true;
+        }
+    };
+
+    private OnClickListener downloadCancelListener = new OnClickListener() {
+
+        @Override
+        public void onClick(View v) {
+            finish();
+        }
+    };
+
+    protected void onDestroy() {
+        super.onDestroy();
+    }
+
+    protected void onPause() {
+        super.onPause();
+        if (isDownloadStarted) {
+            finish();
+        }
+    }
+
+    protected void onResume() {
+        super.onResume();
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
+
+        if (DOWNLOAD_PATH == requestCode) {
+            if (resultCode == Activity.RESULT_OK && intent != null) {
+                downloadPath = intent.getStringExtra("result_dir_sel");
+                if (downloadPath != null) {
+                    String rawEmulatedStorageTarget = System.getenv(ENV_EMULATED_STORAGE_TARGET);
+                    if (!TextUtils.isEmpty(rawEmulatedStorageTarget)) {
+                        if (downloadPath.startsWith("/storage/sdcard0"))
+                            downloadPath = downloadPath.replace("/storage/sdcard0",
+                                    "/storage/emulated/0");
+                        if (downloadPath.startsWith("/storage/emulated/legacy"))
+                            downloadPath = downloadPath.replace("/storage/emulated/legacy",
+                                    "/storage/emulated/0");
+                    }
+                    downloadPathForUser = DownloadHandler.getDownloadPathForUser(
+                            DownloadSettings.this, downloadPath);
+                    setDownloadPathForUserText(downloadPathForUser);
+                }
+            }
+        }
+    }
+
+    /**
+     * show download path for user
+     *
+     * @param downloadPath the download path user can see
+     */
+    private void setDownloadPathForUserText(String downloadPathForUser) {
+        downloadPathET.setText(downloadPathForUser);
+    }
+
+    /**
+     * get the filename from user select the download path
+     *
+     * @return String the filename from user selected
+     */
+    private String getFilenameBaseFromUserEnter() {
+        return downloadFilenameET.getText().toString();
+    }
+
+    /**
+     * set the download file size for user to be known
+     */
+    private void setDownloadFileSizeText() {
+        String sizeText;
+        if (contentLength <= 0) {
+            sizeText = getString(R.string.unknow_length);
+        } else {
+            sizeText = getDownloadFileSize();
+        }
+        downloadEstimateSize.setText(sizeText);
+
+    }
+
+    /**
+     * set the time which downloaded this file will be estimately use;
+     */
+    private void setDownloadFileTimeText() {
+        String neededTimeText;
+        if (contentLength <= 0) {
+            neededTimeText = getString(R.string.unknow_length);
+        } else {
+            neededTimeText = getNeededTime() + getString(R.string.time_min);
+        }
+        downloadEstimateTime.setText(neededTimeText);
+    }
+
+    /**
+     * count the download file's size and format the values
+     *
+     * @return String the format values
+     */
+    private String getDownloadFileSize() {
+        String currentSizeText = "";
+        if (contentLength > 0) {
+            currentSizeText = Formatter.formatFileSize(DownloadSettings.this, contentLength);
+        }
+        return currentSizeText;
+    }
+
+    /**
+     * get the time download this file will be use,and format this time values
+     *
+     * @return long the valses of time which download this file will be use
+     */
+    private long getNeededTime() {
+        long timeNeeded = contentLength / downloadRate;
+        if (timeNeeded < 1) {
+            timeNeeded = 1;
+        }
+        Log.e(LOGTAG, "TimeNeeded:" + timeNeeded + "min");
+        // return the time like 5 min, not 5 s;
+        return timeNeeded;
+    }
+}