尝试调用新的 Fragment 页面时活动被破坏 - Xamarin.Android

Question

I am using a Xamarin.Android template (BottomNavigationView) to create an app with a bottom menu. I am trying to get it so that one of the pages that is on the menu ie a profile page has a button that will take me to another fragment. However when I call the SupportFragmentManager I am getting an error saying "the activity has been destroyed".

I'd like both those buttons to go to other pages that also display the bottom menu button (as i would like it to be consistent throughout my app). The code I am using is:

FragmentActivity fragmentActivity = new FragmentActivity();
               fragmentActivity.SupportFragmentManager.BeginTransaction()
               .Replace(Resource.Id.content_frame, ShowFriendRequests.NewInstance())
               .Commit();

The template I am using uses the android.support.v4.app.Fragment and has a MainActivity that I think uses FragmentActivity. But I'm not entirely sure because it was all premade. I have just added the fragment files.

Any idea why I'd be getting this error?

Thank you

Answer 1

Anyway I think you are not preforming FragmentTransaction correctly instead of using FragmentActivity use FragmentTransaction to replace one Fragment with another or to Add another Fragment . For example in Java code that would go like this:

FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.content_frame, new ShowFriendRequests()).commit();

In c# I suppose something like this:

FragmentTransaction fragmentTx = FragmentManager.BeginTransaction();
ShowFriendRequests friendRequest = new ShowFriendRequests();

// Id is ID of your layout which you want to replace with fragment
fragmentTx.Replace(Resource.Id.content_frame, friendRequest);
fragmentTx.Commit();