Handle restore of the original naive wallpaper backup schema

import java.io.IOException;

/**

 * Backup agent for various system-managed data

 * Backup agent for various system-managed data, currently just the system wallpaper

 */

public class SystemBackupAgent extends BackupHelperAgent {

    private static final String TAG = "SystemBackupAgent";

    // These paths must match what the WallpaperManagerService uses

    private static final String WALLPAPER_IMAGE = "/data/data/com.android.settings/files/wallpaper";

    private static final String WALLPAPER_INFO = "/data/system/wallpaper_info.xml";

    @Override

    public void onCreate() {

    public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data,

            ParcelFileDescriptor newState) throws IOException {

        // We only back up the data under the current "wallpaper" schema with metadata

        addHelper("wallpaper", new AbsoluteFileBackupHelper(SystemBackupAgent.this,

                new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO }));

        super.onBackup(oldState, data, newState);

    }

    @Override

    public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState)

            throws IOException {

        // On restore, we also support a previous data schema "system_files"

        addHelper("wallpaper", new AbsoluteFileBackupHelper(SystemBackupAgent.this,

                new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO }));

        addHelper("system_files", new AbsoluteFileBackupHelper(SystemBackupAgent.this,

                new String[] { WALLPAPER_IMAGE }));

        boolean success = false;

        try {

            super.onRestore(data, appVersionCode, newState);