android 在画布上画图片

@Override

public void onDraw(Canvas canvas) {

Drawable buttonMore = getResources().getDrawable(

R.drawable.button_triangle);

                // setBounds(Rect rect); rect 是画布的一块区域，图片会缩放以填充Rect.

buttonMore.setBounds(region.getBounds());

buttonMore.draw(canvas);

}