Using android:fitsSystemWindows="true/false" Navigation drawer height changing and Navigation bar becoming white

It is not necessary that you have to be bound with Unityplayer activity or mainActivity.

You can make any activity static and call the function or UI present in those activities from c# unity.

The correct methodology is to create a static Activity in your main Android project and call it currentActivity. After this in your oncreate method you set the currentActivity to this the following code demonstrated that:

public class MainActivity extends UnityPlayerActivity { public static MainActivity currentActivity; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); currentActivity=this; 

In addition : From your Unity code you can use C# to call an Android method from the MainActivity by using the following code:

AndroidJavaClass jc = new AndroidJavaClass("yourpackagename.youractivity"); AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity"); jo.Call("toggleMenu"); 

OR

You can convert UnityPlayerActivity to Fragment,link mentioned below will help you on same

How can I open an Android Fragment in a new process?