获取bitmap的大小

有多少字节？

 public static int getBitmapSize(BitmapDrawable value) {
        Bitmap bitmap = value.getBitmap();

        // From KitKat onward use getAllocationByteCount() as allocated bytes can potentially be
        // larger than bitmap byte count.
        if (Utils.hasKitKat()) {
            return bitmap.getAllocationByteCount();
        }

        if (Utils.hasHoneycombMR1()) {
            return bitmap.getByteCount();
        }

        // Pre HC-MR1
        return bitmap.getRowBytes() * bitmap.getHeight();
    }