How to Android Window AddView using Unity?

How to PIP(picture in picture) using Android WindowManger Is there way to do it ? Or is there another way of doing this?

     var unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
     var activity = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
     AndroidJavaObject windowManger = activity.Call<AndroidJavaObject>("getWindowManager");
     AndroidJavaObject layoutParams = new 
     AndroidJavaObject("android/view/WindowManager&LayoutParams");
     windowManger.Call("addView",btn,layoutParams);