Android 如何将Drawable和Bitmap画到屏幕上

Drawable画到屏幕上：

protected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);canvas.drawColor(Color.WHITE);int startX=10;int startY=10;int width=100;int height=50;mDrawable=new ShapeDrawable(new OvalShape());mDrawable.setBounds(startX, startY, width, height);mDrawable.getPaint().setColor(Color.GREEN);mDrawable.draw(canvas);} 

Bitmap画到屏幕上：

 Canvas.drawBitmap (bmp, x, y, Paint)