1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server; 18 19 import android.backup.AbsoluteFileBackupHelper; 20 import android.backup.BackupDataInput; 21 import android.backup.BackupDataInputStream; 22 import android.backup.BackupDataOutput; 23 import android.backup.BackupHelper; 24 import android.backup.BackupHelperAgent; 25 import android.content.Context; 26 import android.os.ParcelFileDescriptor; 27 import android.os.ServiceManager; 28 import android.os.SystemService; 29 import android.util.Log; 30 31 import java.io.File; 32 import java.io.IOException; 33 34 /** 35 * Backup agent for various system-managed data, currently just the system wallpaper 36 */ 37 public class SystemBackupAgent extends BackupHelperAgent { 38 private static final String TAG = "SystemBackupAgent"; 39 40 // These paths must match what the WallpaperManagerService uses 41 private static final String WALLPAPER_IMAGE = "/data/data/com.android.settings/files/wallpaper"; 42 private static final String WALLPAPER_INFO = "/data/system/wallpaper_info.xml"; 43 44 @Override onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState)45 public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, 46 ParcelFileDescriptor newState) throws IOException { 47 // We only back up the data under the current "wallpaper" schema with metadata 48 WallpaperManagerService wallpaper = (WallpaperManagerService)ServiceManager.getService( 49 Context.WALLPAPER_SERVICE); 50 String[] files = new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO }; 51 if (wallpaper != null && wallpaper.mName != null && wallpaper.mName.length() > 0) { 52 // When the wallpaper has a name, back up the info by itself. 53 // TODO: Don't rely on the innards of the service object like this! 54 // TODO: Send a delete for any stored wallpaper image in this case? 55 files = new String[] { WALLPAPER_INFO }; 56 } 57 addHelper("wallpaper", new AbsoluteFileBackupHelper(SystemBackupAgent.this, files)); 58 super.onBackup(oldState, data, newState); 59 } 60 61 @Override onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState)62 public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) 63 throws IOException { 64 // On restore, we also support a previous data schema "system_files" 65 addHelper("wallpaper", new AbsoluteFileBackupHelper(SystemBackupAgent.this, 66 new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO })); 67 addHelper("system_files", new AbsoluteFileBackupHelper(SystemBackupAgent.this, 68 new String[] { WALLPAPER_IMAGE })); 69 70 boolean success = false; 71 try { 72 super.onRestore(data, appVersionCode, newState); 73 74 WallpaperManagerService wallpaper = (WallpaperManagerService)ServiceManager.getService( 75 Context.WALLPAPER_SERVICE); 76 wallpaper.settingsRestored(); 77 } catch (IOException ex) { 78 // If there was a failure, delete everything for the wallpaper, this is too aggresive, 79 // but this is hopefully a rare failure. 80 Log.d(TAG, "restore failed", ex); 81 (new File(WALLPAPER_IMAGE)).delete(); 82 (new File(WALLPAPER_INFO)).delete(); 83 } 84 } 85 } 86