title: Can not initialise firebase xamarin Android
body: <p>I am Trying to create a xamarin android app that sends data to the firebase database that I have created I initialize it using 
  but every time I try to start the app it gives me this exception </p>
  
  <pre><code>protected override void OnCreate(Bundle bundle)
  {
          Firebase.FirebaseApp.InitializeApp(this);
          FirebaseDatabase database = FirebaseDatabase.Instance;
          DatabaseReference myRef = database.GetReference("app6-85d57:");
          myRef.SetValue("hello world"); 
          base.OnCreate(bundle);
  }
  </code></pre>
  
  <blockquote>
    <p>Java.Lang.IllegalStateException: Default FirebaseApp is not initialized in this process App6.App6. Make sure to call FirebaseApp.initilizeApp(Context) first.</p>
  </blockquote>
  
  <p>how can i solve this? i can't find a solution anywhere.</p>