android getCompoundDrawables()用法作用，以及返回的drawable数组怎么转换为bitmap？

该方法返回包含控件左,上,右,下四个位置的Drawable的数组，

Drawable转换为Bitmap的方法
public static Bitmap drawableToBitmap(Drawable drawable) {

Bitmap bitmap = Bitmap
.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
//canvas.setBitmap(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}

http://blog.csdn.net/tianyitianyi1/article/details/7582468