interface IWallpaperConnection {

    void attachEngine(IWallpaperEngine engine);

    ParcelFileDescriptor setWallpaper(String name);

}

oneway interface IWallpaperService {

    void attach(IWallpaperConnection connection,

            IBinder windowToken, int windowType, boolean isPreview,

            int reqWidth, int reqHeight);

}

oneway interface IWallpaperEngine {

    void setDesiredSize(int width, int height);

    void setVisibility(boolean visible);

    void dispatchPointer(in MotionEvent event);

    void dispatchWallpaperCommand(String action, int x, int y,            int z, in Bundle extras);

    void destroy();

}

private WallpaperManager mWallpaperManager = null;

private WallpaperInfo mWallpaperInfo = null;

private WallpaperConnection mWallpaperConnection = null;

private Intent mWallpaperIntent;

mWallpaperManager = WallpaperManager.getInstance(this);

mWallpaperInfo = mWallpaperManager.getWallpaperInfo();//如果返回null則說明當前不是動態壁紙

mWallpaperIntent = new Intent(WallpaperService.SERVICE_INTERFACE);

mWallpaperIntent.setClassName(mWallpaperInfo.getPackageName(), mWallpaperInfo.getServiceName());

bindService(mIntent, this, Context.BIND_AUTO_CREATE);

IWallpaperService mService;//這里有一個adil接口

public void onServiceConnected(ComponentName name, IBinder service) {

                mService = IWallpaperService.Stub.asInterface(service);

                try {

                    mService.attach(this, view.getWindowToken(),

                    //        WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA_OVERLAY,
                            WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA,

                                  true, root.getWidth(), root.getHeight());

                } catch (RemoteException e) {

                    Log.w("", "Failed attaching wallpaper; clearing", e);
                }
        }