如何在Glide中旋转图像使其正面朝上

Glide.with(context)
    .load(imageUrl)
    .into(imageView);

public class RotateTransformation implements Transformation<Bitmap> {

    private float rotateAngle;

    public RotateTransformation(float rotateAngle) {
        this.rotateAngle = rotateAngle;
    }

    @Override
    public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
        Matrix matrix = new Matrix();
        matrix.postRotate(rotateAngle);
        Bitmap rotatedBitmap = Bitmap.createBitmap(resource.get(), 0, 0, outWidth, outHeight, matrix, true);
        return new BitmapResource(rotatedBitmap, Glide.get(context).getBitmapPool());
    }

    @Override
    public String getId() {
        return "rotate" + rotateAngle;
    }
}

Glide.with(context)
    .load(imageUrl)
    .transform(new RotateTransformation(90))  // 旋转角度为90度
    .into(imageView);