请问使用glide.into(SimpleTarget)怎么设置圆角不生效

我在使用glide加载图片时，设置了centerCrop和圆角。但是在使用自定义的SimpleTarget时，圆角不能正常展示，请问怎么解决？
我的glide使用版本是3.7。

https://www.v2ex.com/t/272092

Glide.with(MyApplication.getmContext()).load("")).transform(new CircleTransform(MyApplication.getmContext())).into(img_touxiang);

 public class CircleTransform extends BitmapTransformation {
  public CircleTransform(Context context) {
    super(context);
  }

  @Override
  protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
    return circleCrop(pool, toTransform);
  }

  private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
    if (source == null) return null;
    int size = Math.min(source.getWidth(), source.getHeight());
    int x = (source.getWidth() - size) / 2;
    int y = (source.getHeight() - size) / 2;
    Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
    Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
    if (result == null) {
      result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
    }
    Canvas canvas = new Canvas(result);
    Paint paint = new Paint();
    paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
    paint.setAntiAlias(true);
    float r = size / 2f;
    canvas.drawCircle(r, r, r, paint);
    return result;
  }

  @Override
  public String getId() {
    return getClass().getName();
  }

}