[android-developers] Why can't draw a picture on canvas

[a a]

Following is my test code

public class testCanvas extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Canvas canvas = new Canvas();
        Drawable draw = getResources().getDrawable(R.drawable.bg);

        Bitmap bitmap = Bitmap.createBitmap(draw.getIntrinsicWidth(),
                                            draw.getIntrinsicWidth(),
                                            Bitmap.Config.RGB_565);
        Paint paint = new Paint();
        paint.setColor(30);
        canvas.setBitmap(bitmap);
        canvas.drawBitmap(bitmap, bitmap.getHeight(), bitmap.getWidth(), paint);
    }

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