diff options
Diffstat (limited to 'core/java')
| -rw-r--r-- | core/java/android/app/backup/FileBackupHelperBase.java | 3 | ||||
| -rw-r--r-- | core/java/android/app/backup/WallpaperBackupHelper.java | 124 |
2 files changed, 126 insertions, 1 deletions
diff --git a/core/java/android/app/backup/FileBackupHelperBase.java b/core/java/android/app/backup/FileBackupHelperBase.java index 1e3158f..887a2e6 100644 --- a/core/java/android/app/backup/FileBackupHelperBase.java +++ b/core/java/android/app/backup/FileBackupHelperBase.java @@ -81,7 +81,7 @@ class FileBackupHelperBase { } } - void writeFile(File f, BackupDataInputStream in) { + boolean writeFile(File f, BackupDataInputStream in) { int result = -1; // Create the enclosing directory. @@ -98,6 +98,7 @@ class FileBackupHelperBase { mExceptionLogged = true; } } + return (result == 0); } public void writeNewStateDescription(ParcelFileDescriptor fd) { diff --git a/core/java/android/app/backup/WallpaperBackupHelper.java b/core/java/android/app/backup/WallpaperBackupHelper.java new file mode 100644 index 0000000..9808200 --- /dev/null +++ b/core/java/android/app/backup/WallpaperBackupHelper.java @@ -0,0 +1,124 @@ +/* + * 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.graphics.BitmapFactory; +import android.os.ParcelFileDescriptor; +import android.util.Slog; + +import java.io.File; + +/** + * Helper for backing up / restoring wallpapers. Basically an AbsoluteFileBackupHelper, + * but with logic for deciding what to do with restored wallpaper images. + * + * @hide + */ +public class WallpaperBackupHelper extends FileBackupHelperBase implements BackupHelper { + private static final String TAG = "WallpaperBackupHelper"; + private static final boolean DEBUG = false; + + // This path must match what the WallpaperManagerService uses + private static final String WALLPAPER_IMAGE = "/data/data/com.android.settings/files/wallpaper"; + + // Stage file - should be adjacent to the WALLPAPER_IMAGE location. The wallpapers + // will be saved to this file from the restore stream, then renamed to the proper + // location if it's deemed suitable. + private static final String STAGE_FILE = "/data/data/com.android.settings/files/wallpaper-tmp"; + + Context mContext; + String[] mFiles; + double mDesiredMinWidth; + double mDesiredMinHeight; + + /** + * Construct a helper for backing up / restoring the files at the given absolute locations + * within the file system. + * + * @param context + * @param files + */ + public WallpaperBackupHelper(Context context, String... files) { + super(context); + + mContext = context; + mFiles = files; + + WallpaperManager wpm; + wpm = (WallpaperManager) context.getSystemService(Context.WALLPAPER_SERVICE); + mDesiredMinWidth = (double) wpm.getDesiredMinimumWidth(); + mDesiredMinHeight = (double) wpm.getDesiredMinimumHeight(); + } + + /** + * 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. + */ + public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data, + ParcelFileDescriptor newState) { + performBackup_checked(oldState, data, newState, mFiles, mFiles); + } + + /** + * Restore one absolute file entity from the restore stream. If we're restoring the + * magic wallpaper file, take specific action to determine whether it is suitable for + * the current device. + */ + public void restoreEntity(BackupDataInputStream data) { + final String key = data.getKey(); + if (isKeyInList(key, mFiles)) { + if (key.equals(WALLPAPER_IMAGE)) { + // restore the file to the stage for inspection + File f = new File(STAGE_FILE); + if (writeFile(f, data)) { + + // Preflight the restored image's dimensions without loading it + BitmapFactory.Options options = new BitmapFactory.Options(); + options.inJustDecodeBounds = true; + BitmapFactory.decodeFile(STAGE_FILE, options); + + if (DEBUG) Slog.v(TAG, "Restoring wallpaper image w=" + options.outWidth + + " h=" + options.outHeight); + + // how much does the image differ from our preference? + double widthRatio = mDesiredMinWidth / options.outWidth; + double heightRatio = mDesiredMinHeight / options.outHeight; + if (widthRatio > 0.8 && widthRatio < 1.25 + && heightRatio > 0.8 && heightRatio < 1.25) { + // sufficiently close to our resolution; go ahead and use it + if (DEBUG) Slog.v(TAG, "wallpaper dimension match; using"); + f.renameTo(new File(WALLPAPER_IMAGE)); + // TODO: spin a service to copy the restored image to sd/usb storage, + // since it does not exist anywhere other than the private wallpaper + // file. + } else { + if (DEBUG) Slog.v(TAG, "dimensions too far off: wr=" + widthRatio + + " hr=" + heightRatio); + f.delete(); + } + } + } else { + // Some other normal file; just decode it to its destination + File f = new File(key); + writeFile(f, data); + } + } + } +} |