android - 如何保存 RoundedBitmapDrawable

Question

我想将图像的形状从正方形更改为圆形。之后我打算保存这个位图。但是我遇到了无法将 RoundedBitmapDrawable 转换为位图的问题？或者可能存在另一种将 RoundedBitmapDrawable 实例保存到 SD 卡的方式。

 void setImage(){
    mBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.user);
    mImageView.setImageDrawable(createNewBitmap(mBitmap));
    mBitmap = ((BitmapDrawable) mImageView.getDrawable()).getBitmap();
    //after that i am planning save bitmap
}

Drawable createNewBitmap(Bitmap bitmap){

RoundedBitmapDrawable roundedBitmapDrawable = RoundedBitmapDrawableFactory.create(getResources(),bitmap);
    roundedBitmapDrawable.setCornerRadius(bitmapRadius);
    roundedBitmapDrawable.setAntiAlias(true);
    return roundedBitmapDrawable;
}