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/*
* 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();
}
}
}
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