How to use RotateDrawable in Xamarin?

Question

Could anyone help me how to use RotateDrawable in Xamarin? I am working on a Xamarin.Forms project and I need to rotate a drawable in the MainActivity.cs and then set the rotated drawable as a background, I've wrote this but I got an exception:

RotateDrawable rotateDrawable = (RotateDrawable)Resource.Drawable.ts_logo; <<<< got exception here
Android.Animation.ObjectAnimator.OfInt(rotateDrawable, "level", 0, 10000).Start();
Window.DecorView.SetBackground(rotateDrawable);

The exception message is "System.InvalidCastException: Specified cast is not valid"

I would assume your `Resource.Drawable.ts_logo` is not a `...` drawable.... — SushiHangover, Apr 23 '19 at 20:22
And I have tried `` and `` but still get the same exception. — Top Systems, Apr 23 '19 at 20:40
Ok, what exactly are you trying to achieve by animating the backgroud|view's level? — SushiHangover, Apr 23 '19 at 21:10
Possible duplicate of [How Do I Use 'RotateDrawable'?](https://stackoverflow.com/questions/5872257/how-do-i-use-rotatedrawable) — Mehdi Dehghani, Apr 24 '19 at 04:57
It's your question and you tagged it, it doesn't mean the tags are correct. if you can do something in Android (_Java_) you can do the same in Xamarin (_C#_) with small amount of changes due to language differents, so I recommend read that question and also search for Android solution. — Mehdi Dehghani, Apr 24 '19 at 05:11
Doesn't make sense and of course I have read this question and many others before I post a new one. This code (my code) may be fine with java but it does make an exception with c#. — Top Systems, Apr 24 '19 at 05:16

score 0 · Answer 1 · answered Apr 24 '19 at 06:23

According to your description and code, Resource.Drawable.ts_logo is ID, you can not convert it to RotateDrawable.

You can try the following code:

RotateDrawable rotateDrawable = new RotateDrawable();
        rotateDrawable.Drawable = GetDrawable(Resource.Drawable.a11);
        Android.Animation.ObjectAnimator.OfInt(rotateDrawable, "level", 0, 10000).Start();
        Window.DecorView.SetBackground(rotateDrawable);

How to use RotateDrawable in Xamarin?

1 Answers1