Recover tabs in the event of a crash
Change-Id: Ia47a5bc1e659e46e7f29a8cec52b6fd2ed675be4
diff --git a/src/com/android/browser/CrashRecoveryHandler.java b/src/com/android/browser/CrashRecoveryHandler.java
new file mode 100644
index 0000000..9e98e76
--- /dev/null
+++ b/src/com/android/browser/CrashRecoveryHandler.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2011 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 android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Debug;
+import android.os.Parcel;
+import android.util.Log;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+
+public class CrashRecoveryHandler {
+
+ private static final String LOGTAG = "BrowserCrashRecovery";
+ private static final String STATE_FILE = "browser_state.parcel";
+ private static final int BUFFER_SIZE = 4096;
+
+ private Controller mController;
+
+ public CrashRecoveryHandler(Controller controller) {
+ mController = controller;
+ }
+
+ public void backupState() {
+ final Bundle state = new Bundle();
+ mController.onSaveInstanceState(state);
+ final Context context = mController.getActivity();
+ new Thread() {
+ @Override
+ public void run() {
+ Parcel p = Parcel.obtain();
+ try {
+ state.writeToParcel(p, 0);
+ FileOutputStream fout = context.openFileOutput(STATE_FILE,
+ Context.MODE_PRIVATE);
+ fout.write(p.marshall());
+ fout.close();
+ } catch (Exception e) {
+ Log.i(LOGTAG, "Failed to save persistent state", e);
+ } finally {
+ p.recycle();
+ }
+ }
+ }.start();
+ }
+
+ public void clearState() {
+ Context context = mController.getActivity();
+ context.deleteFile(STATE_FILE);
+ }
+
+ public void promptToRecover(final Bundle state, final Intent intent) {
+ new AlertDialog.Builder(mController.getActivity())
+ .setTitle(R.string.recover_title)
+ .setMessage(R.string.recover_prompt)
+ .setPositiveButton(R.string.recover_yes, new OnClickListener() {
+ @Override
+ public void onClick(DialogInterface dialog, int which) {
+ mController.doStart(state, intent);
+ }
+ })
+ .setNegativeButton(R.string.recover_no, new OnClickListener() {
+ @Override
+ public void onClick(DialogInterface dialog, int which) {
+ clearState();
+ mController.doStart(null, intent);
+ }
+ })
+ .show();
+ }
+
+ public void startRecovery(Intent intent) {
+ Parcel parcel = Parcel.obtain();
+ try {
+ Context context = mController.getActivity();
+ FileInputStream fin = context.openFileInput(STATE_FILE);
+ ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
+ byte[] buffer = new byte[BUFFER_SIZE];
+ int read;
+ while ((read = fin.read(buffer)) > 0) {
+ dataStream.write(buffer, 0, read);
+ }
+ byte[] data = dataStream.toByteArray();
+ parcel.unmarshall(data, 0, data.length);
+ parcel.setDataPosition(0);
+ Bundle state = parcel.readBundle();
+ promptToRecover(state, intent);
+ } catch (FileNotFoundException e) {
+ // No state to recover
+ mController.doStart(null, intent);
+ } catch (Exception e) {
+ Log.w(LOGTAG, "Failed to recover state!", e);
+ mController.doStart(null, intent);
+ } finally {
+ parcel.recycle();
+ }
+ }
+}