使用RoundedBitmapDrawable生成圆角图片的方法

Bitmap src = BitmapFactory.decodeResource(getResources(), imageId); //获取Bitmap图片
RoundedBitmapDrawable roundedBitmapDrawable = RoundedBitmapDrawableFactory.create(getResources(), src); //创建RoundedBitmapDrawable对象
roundedBitmapDrawable.setCornerRadius(100); //设置圆角半径（根据实际需求）
roundedBitmapDrawable.setAntiAlias(true); //设置反走样
image.setImageDrawable(roundedBitmapDrawable); //显示圆角图片 

Bitmap src = BitmapFactory.decodeResource(getResources(), imageId);
Bitmap dst;
//将长方形图片裁剪成正方形图片
if (src.getWidth() >= src.getHeight()){
dst = Bitmap.createBitmap(src, src.getWidth()/2 - src.getHeight()/2, 0, src.getHeight(), src.getHeight()
);
}else{
dst = Bitmap.createBitmap(src, 0, src.getHeight()/2 - src.getWidth()/2, src.getWidth(), src.getWidth()
);
}
RoundedBitmapDrawable roundedBitmapDrawable = RoundedBitmapDrawableFactory.create(getResources(), dst);
roundedBitmapDrawable.setCornerRadius(dst.getWidth() / 2); //设置圆角半径为正方形边长的一半
roundedBitmapDrawable.setAntiAlias(true);
image.setImageDrawable(roundedBitmapDrawable);