解决Glide4.0圆角和CenterCrop不能共存的问题

public class CenterCropRoundCornerTransform extends CenterCrop {

    private int radius = 0;

    public CenterCropRoundCornerTransform(int radius){
        this.radius = radius;
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform,
                               int outWidth, int outHeight) {
        Bitmap transform = super.transform(pool, toTransform, outWidth, outHeight);
        return roundCrop(pool, transform);
    }

    private Bitmap roundCrop(BitmapPool pool, Bitmap source) {
        if (source == null)
            return null;
        Bitmap result = pool.get(source.getWidth(), source.getHeight(),
                Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(),
                    Bitmap.Config.ARGB_8888);
        }
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP,
                BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return result;
    }

}

使用（Kotlin代码）

var options = RequestOptions()
options.transform(CenterCropRoundCornerTransform(Utils.dp2px(activity,5)))
Glide.with(this)
                .load("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502254525934&di=bc87af364c11e1e23183246c0a0d27da&imgtype=0&src=http%3A%2F%2Fimg5q.duitang.com%2Fuploads%2Fitem%2F201406%2F10%2F20140610013326_4zPtP.jpeg")
                .apply(options)
                .into(iv_user_icon)