Drawable转bitmap

    public static Bitmap DrawableToBitmap(Drawable drawable) {

        // 获取 drawable 长宽
        int width = drawable.getIntrinsicWidth();
        int heigh = drawable.getIntrinsicHeight();

        drawable.setBounds(0, 0, width, heigh);

        // 获取drawable的颜色格式
        Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                : Bitmap.Config.RGB_565;
        // 创建bitmap
        Bitmap bitmap = Bitmap.createBitmap(width, heigh, config);
        // 创建bitmap画布
        Canvas canvas = new Canvas(bitmap);
        // 将drawable 内容画到画布中
        drawable.draw(canvas);
        return bitmap;
    }