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/*
* Copyright (C) 2009 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 android.backup;
import android.backup.RestoreSession;
import android.content.Context;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.util.Log;
/**
* BackupManager is the interface to the system's backup service.
* Applications simply instantiate one, and then use that instance
* to communicate with the backup infrastructure.
*
* <p>When your application has made changes to data it wishes to have
* backed up, call {@link #dataChanged()} to notify the backup service.
* The system will then schedule a backup operation to occur in the near
* future. Repeated calls to {@link #dataChanged()} have no further effect
* until the backup operation actually occurs.
*
* <p>The backup operation itself begins with the system launching the
* {@link android.app.BackupAgent} subclass declared in your manifest. See the
* documentation for {@link android.app.BackupAgent} for a detailed description
* of how the backup then proceeds.
*
* <p>STOPSHIP more documentation here! Include the attributes:
* android:backupAgent
* android:allowBackup
* android:restoreNeedsApplication
* android:killAfterRestore
*/
public class BackupManager {
private static final String TAG = "BackupManager";
/** @hide TODO: REMOVE THIS */
public static final boolean EVEN_THINK_ABOUT_DOING_RESTORE = true;
private Context mContext;
private static IBackupManager sService;
private static void checkServiceBinder() {
if (sService == null) {
sService = IBackupManager.Stub.asInterface(
ServiceManager.getService(Context.BACKUP_SERVICE));
}
}
/**
* Constructs a BackupManager object through which the application can
* communicate with the Android backup system.
*
* @param context The {@link android.content.Context} that was provided when
* one of your application's {@link android.app.Activity Activities}
* was created.
*/
public BackupManager(Context context) {
mContext = context;
}
/**
* Notifies the Android backup system that your application wishes to back up
* new changes to its data. A backup operation using your application's
* {@link android.app.BackupAgent} subclass will be scheduled when you call this method.
*/
public void dataChanged() {
if (!EVEN_THINK_ABOUT_DOING_RESTORE) {
return;
}
checkServiceBinder();
if (sService != null) {
try {
sService.dataChanged(mContext.getPackageName());
} catch (RemoteException e) {
Log.d(TAG, "dataChanged() couldn't connect");
}
}
}
/**
* Convenience method for callers who need to indicate that some other package
* needs a backup pass. This can be relevant in the case of groups of packages
* that share a uid, for example.
*
* This method requires that the application hold the "android.permission.BACKUP"
* permission if the package named in the argument is not the caller's own.
*/
public static void dataChanged(String packageName) {
if (!EVEN_THINK_ABOUT_DOING_RESTORE) {
return;
}
checkServiceBinder();
if (sService != null) {
try {
sService.dataChanged(packageName);
} catch (RemoteException e) {
Log.d(TAG, "dataChanged(pkg) couldn't connect");
}
}
}
/**
* Begin the process of restoring data from backup. See the
* {@link android.backup.RestoreSession} class for documentation on that process.
*/
public RestoreSession beginRestoreSession() {
if (!EVEN_THINK_ABOUT_DOING_RESTORE) {
return null;
}
RestoreSession session = null;
checkServiceBinder();
if (sService != null) {
try {
String transport = sService.getCurrentTransport();
IRestoreSession binder = sService.beginRestoreSession(transport);
session = new RestoreSession(mContext, binder);
} catch (RemoteException e) {
Log.w(TAG, "beginRestoreSession() couldn't connect");
}
}
return session;
}
}
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