android Gif播放

public class GifSurface extends SurfaceView implements Callback{

    private Movie movie;
    private static int ZOOM = 2;
    public String path;
    
    private Handler handler = new Handler();
    private Runnable runnable = new Runnable() {
        
        @Override
        public void run() {
            Canvas canvas = holder.lockCanvas();
            canvas.save();
            canvas.scale(ZOOM, ZOOM);
            movie.draw(canvas, 0, 0);
            canvas.restore();
            
            holder.unlockCanvasAndPost(canvas);
            movie.setTime((int) (System.currentTimeMillis()%movie.duration()));
            handler.removeCallbacks(runnable);
            handler.postDelayed(runnable, 30);
        }
    };

    private SurfaceHolder holder;    
    public GifSurface(Context context, AttributeSet attrs) {
        super(context, attrs);
        
        holder = getHolder();
        holder.addCallback(this);
    }
    
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        try {
            InputStream is = getContext().getAssets().open("122856549320150205220255.gif");
            movie = Movie.decodeStream(is);
            
            int width = movie.width();
            int height = movie.height();
            setMeasuredDimension(width*ZOOM, height*ZOOM);
            handler.post(runnable);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
    
        
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        handler.removeCallbacks(runnable);
    }

    private void setZoom(int zoom) {
        this.ZOOM = zoom;

    }
    
    public void setPath(String path) {
        this.path = path;
    }
}