在一个图上画图

Bitmap b=BitmapFactory.decodeResource(CON.getResources(),R.drawable.deltio);?
? ? Bitmap bmOverlay = Bitmap.createBitmap(b.getWidth(), b.getHeight(), b.getConfig());?
canvas = new Canvas(bmOverlay);?
Paint paint = new Paint();?
? ? ? ? ? ? paint.setColor(Color.RED);?
canvas.drawBitmap(b, new Matrix(), null);?
canvas.drawCircle(750, 14, 11, paint);?