ImageVIew在xamarin android中的某些设备中将背景设置为黑色

我尝试使用矩阵值旋转图像,并将旋转后的位图设置为图像视图。在这种情况下,图像视图背景被设置为黑色。请对此提出任何建议。

设备详细信息:摩托罗拉Moto G(4)(安卓7.0-Api 24)

样品:

我的代码:

 protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        // Set our view from the "main" layout resource
        LinearLayout linearLayout = new LinearLayout(this);
        imageView = new ImageView(this);
        imageView.LayoutParameters = new Android.Views.ViewGroup.LayoutParams(LinearLayout.LayoutParams.MatchParent, 1200);
        bitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.Nature);
        linearLayout.AddView(imageView);
        linearLayout.Orientation = Orientation.Vertical;
        Button button = new Button(this);
        button.Text = "Click me";
        button.Click += Button_Click;
        button.LayoutParameters = new Android.Views.ViewGroup.LayoutParams(150, 150);
        linearLayout.AddView(button);
        imageView.SetImageBitmap(bitmap);
        SetContentView(linearLayout);
    }

    private void Button_Click(object sender, System.EventArgs e)
    {
        int angle = 45;
        Matrix = new Matrix();
        int cx = bitmap.Width / 2;
        int cy = bitmap.Height / 2;
        this.Matrix.PreTranslate(-cx, -cy);
        this.Matrix.PostRotate(angle);
        this.Matrix.PostTranslate(this.imageView.Width / 2, this.imageView.Height / 2);
        using (var tiltBitmap = Bitmap.CreateBitmap(bitmap, 0, 0, bitmap.Width, bitmap.Height, Matrix, false))
        {
         
            imageView.SetImageBitmap(tiltBitmap);
        }
        this.Matrix.Dispose();
    }