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/*
* Copyright (C) 2010 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.app.backup;
import android.app.WallpaperManager;
import android.content.Context;
import android.os.Environment;
import android.os.ParcelFileDescriptor;
import android.os.UserHandle;
import android.util.Slog;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
/**
* We no longer back up wallpapers with this helper, but we do need to process restores
* of legacy backup payloads. We just take the restored image as-is and apply it as the
* system wallpaper using the public "set the wallpaper" API.
*
* @hide
*/
public class WallpaperBackupHelper extends FileBackupHelperBase implements BackupHelper {
private static final String TAG = "WallpaperBackupHelper";
private static final boolean DEBUG = false;
// Key that legacy wallpaper imagery was stored under
public static final String WALLPAPER_IMAGE_KEY =
"/data/data/com.android.settings/files/wallpaper";
public static final String WALLPAPER_INFO_KEY = "/data/system/wallpaper_info.xml";
// Stage file that the restored imagery is stored to prior to being applied
// as the system wallpaper.
private static final String STAGE_FILE =
new File(Environment.getUserSystemDirectory(UserHandle.USER_SYSTEM),
"wallpaper-tmp").getAbsolutePath();
private final String[] mKeys;
private final WallpaperManager mWpm;
/**
* Legacy wallpaper restores, from back when the imagery was stored under the
* "android" system package as file key/value entities.
*
* @param context
* @param files
*/
public WallpaperBackupHelper(Context context, String[] keys) {
super(context);
mContext = context;
mKeys = keys;
mWpm = (WallpaperManager) context.getSystemService(Context.WALLPAPER_SERVICE);
}
/**
* Based on oldState, determine which of the files from the application's data directory
* need to be backed up, write them to the data stream, and fill in newState with the
* state as it exists now.
*/
@Override
public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState) {
// Intentionally no-op; we don't back up the wallpaper this way any more.
}
/**
* Restore one absolute file entity from the restore stream. If we're restoring the
* magic wallpaper file, apply it as the system wallpaper.
*/
@Override
public void restoreEntity(BackupDataInputStream data) {
if (mWpm == null) {
Slog.w(TAG, "restoreEntity(): no wallpaper service");
return;
}
final String key = data.getKey();
if (isKeyInList(key, mKeys)) {
if (key.equals(WALLPAPER_IMAGE_KEY)) {
// restore the file to the stage for inspection
File stage = new File(STAGE_FILE);
try {
if (writeFile(stage, data)) {
try (FileInputStream in = new FileInputStream(stage)) {
mWpm.setStream(in);
} catch (IOException e) {
Slog.e(TAG, "Unable to set restored wallpaper: " + e.getMessage());
}
} else {
Slog.e(TAG, "Unable to save restored wallpaper");
}
} finally {
stage.delete();
}
}
}
}
}
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