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RoundedBitmapDrawable生成圆角图片

 

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

动态

生成圆形图片
由于RoundedBitmapDrawable类没有直接提供生成圆形图片的方法,所以生成圆形图片首先需要对原始图片进行裁剪,将图片裁剪成正方形,最后再生成圆形图片,具体实现如下:

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);

 

posted @ 2016-08-31 23:05  森林森  阅读(1915)  评论(1编辑  收藏  举报