SurfaceView und onDraw probleme...

1public class Grafik extends SurfaceView {
2
3 private SurfaceHolder surfaceHolder;
4 private Bitmap bmp;
5
6 public Grafik(Context context) {
7 super(context);
8
9 surfaceHolder = getHolder();
10 surfaceHolder.addCallback(new SurfaceHolder.Callback() {
11
12 @Override
13 public void surfaceCreated(SurfaceHolder surfaceHolder) {
14 Canvas theCanvas = surfaceHolder.lockCanvas(null);
15 onDraw(theCanvas);
16 surfaceHolder.unlockCanvasAndPost(theCanvas);
17
18 }
19
20 @Override
21 public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i2, int i3) {
22
23 }
24
25 @Override
26 public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
27
28 }
29
30 });
31 bmp = BitmapFactory.decodeResource(getResources(),R.drawable.wallpaper);
32
33 }
34
35 @Override
36 public void onDraw(Canvas canvas){
37 canvas.drawColor(Color.DKGRAY);
38 canvas.drawBitmap(bmp, 0, 0, null);
39
40 }
41}