CODEWITHSUNDEEP
androidxamarinxamarin.formsxamarin.android
Arie
Arie

Reputation: 3543

Navigating between pages

I am new in this area and have such situation that i have two pages:

MainActivity.axml
SecondActivity.axml

I have a button in MainActivity called BtnOther, in this button i want to navigate to SecondActivity. In SecondActivity i have button btnBackToExisting1stPage which i want to go back to MainActivity. Generally it works but:

  1. After either BtnOther or android back arrow is clicked application is going to minimize on emulator and not staying in front. Why is that and how to avoid that?

  2. I would like when pressing either BtnOther or back arrow to go back from SecondActivity to MainActivity BUT to open exact MainActivity state as was before. For instance if i would have text edit field on MainActivity and put some text before going to SecondActivity and then when going back from SecondActivity i want to see exact same form state of MainActivity instead of creating new as seem to be in my current code.

My current code:

 public class MainActivity : AppCompatActivity
 {
      protected  override void OnCreate(Bundle savedInstanceState)
      {
          base.OnCreate(savedInstanceState);
          Plugin.CurrentActivity.CrossCurrentActivity.Current.Init(this, savedInstanceState);
          Xamarin.Essentials.Platform.Init(this, savedInstanceState);
          // Set our view from the "main" layout resource
          SetContentView(Resource.Layout.activity_main);

          var btnOther = FindViewById<Button>(Resource.Id.Other);
          btnOther.Click += BtnOther_Click;
      }

      private void BtnOther_Click(object sender, EventArgs e)
      {
         Intent nextActivity = new Intent(this, typeof(SecondActivity));
         StartActivity(nextActivity);
         Finish();
      }
}

public class SecondActivity : Activity
{
      protected override void OnCreate(Bundle savedInstanceState)
      {
          base.OnCreate(savedInstanceState);
          // Create your application here
          SetContentView(Resource.Layout.Second);

          var btnBackToExisting1stPage = FindViewById<Button>(Resource.Id.BackToExisting1stPage);

          btnBackToExisting1stPage.Click += OnBackPressed;
      }

      private void OnBackPressed(object sender, EventArgs e)
      {
          OnBackPressed();
      }

      public override void OnBackPressed()
      {
          Toast.MakeText(this, "Back button Pressed", ToastLength.Short).Show();
          base.OnBackPressed();         
          Finish();
      }
}

Upvotes: 0

Views: 68

Answers (1)

Kkba Shetty
Kkba Shetty

Reputation: 41

While starting second activity from button click, you are calling "finish()" which destroys the MainActivity and creates SecondActivity. Just remove/comment the "finish()" call. You will have the retained instance as it is in MainActivity even while clicking back button.

Upvotes: 2

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