9patch生成图片

private Bitmap get_ninepatch(int id,int x, int y, Context context){
    // id is a resource id for a valid ninepatch

    Bitmap bitmap = BitmapFactory.decodeResource(
            context.getResources(), id);

    byte[] chunk = bitmap.getNinePatchChunk();
    NinePatchDrawable np_drawable = new NinePatchDrawable(bitmap,
            chunk, new Rect(), null);
    np_drawable.setBounds(0, 0,x, y);

    Bitmap output_bitmap = Bitmap.createBitmap(x, y, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output_bitmap);
    np_drawable.draw(canvas);

    return output_bitmap;
}