protected override void OnCreate(Bundle savedInstanceState) { base.OnCreate(savedInstanceState); // Set our view from the "main" layout resource SetContentView(Resource.Layout.Main); // Get our button from the layout resource, // and attach an event to it mBtnSignIn = FindViewById <Button>(Resource.Id.btn_sign_in); mEtEmail = FindViewById <EditText>(Resource.Id.et_email); mEtPassword = FindViewById <EditText>(Resource.Id.et_password); mBtnSignIn.Click += SignInHandler; try { Leanplum.AddVariablesChangedHandler(new CustomVariablesChangedCallback(VariableChanged)); Leanplum.Start(this); } catch (Exception ex) { ex.ToString(); } }