onSaveInstanceState   
  Call this method from the parent Activity/Fragment's corresponding method.
In your Activity/Fragment:
    protected void onSaveInstanceState( Bundle outState ) {
        super.onSaveInstanceState( outState );
        if( mMapControl != null ) {
            mMapControl.onSaveInstanceState( outState );
        }
    }
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Parameters
outState 
Bundle in which to place your saved state. This value must never be null.
See also
<a href="https://developer.android.com/reference/android/app/Activity#onSaveInstanceState(android.os.Bundle)">Activity.onSaveInstanceState()</a>