How to clear the resources used by the fragment while we destroy the activity?

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C#

For example, I have added the TextView inside the fragment as below.

        var adaptor = new GenericFragmentPagerAdaptor(SupportFragmentManager); // where GenericFragementPagerAdaptor is a sub-class derived from FragementPagerAdaptor

        adaptor.AddFragmentView((i, v, b) => {
            var view = i.Inflate(Resource.Layout.tab, v, false);
            textView = new TextView(view.Context);
            textView.Text = "Test1";
            view.FindViewById<FrameLayout>(Resource.Id.mainFrame).AddView(textView);
            return view;

If I am destroying the current activity means, all the resources related to the fragment should be cleared.Where and how can I do that? Please, anyone suggests me.

What I have tried:

I have tried by given like below in OnDestroyView() and OnDetach() override methods in Fragment class

this.FragmentManager.Fragments.Clear();

But it did not worked.

Posted 7-Sep-16 1:09am

Divakar13

Updated 7-Sep-16 13:21pm

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David_Wimbley · Answer 1 · 2016-09-07T13:21:00

If i understand what you are asking i think what you want to do is use the IDisposable interface which will handle the cleanup of resources for you.

Your usage having used IDisposable would then be

C#

using(var adaptor = new GenericFragmentPagerAdaptor(SupportFragmentManager))
{

        adaptor.AddFragmentView((i, v, b) => {
            var view = i.Inflate(Resource.Layout.tab, v, false);
            textView = new TextView(view.Context);
            textView.Text = "Test1";
            view.FindViewById<FrameLayout>(Resource.Id.mainFrame).AddView(textView);
            return view;
		});
}

By doing it this way, anything outside the using(){} would be automatically cleaned up by the garbage disposal process.

An example of implementing IDisposable would be something like this:

C#

public class MyClass : IDisposable
{
   private bool Disposed { get; set; }

   public void Dispose()
   {
      this.Dispose(true);
      GC.SuppressFinalize(this);
   }
   
   protected virtual void Dispose(bool disposing)
   {
      if (!this.Disposed)
      {
         if (disposing)
         {
            // do your code cleanup here to free resources and what not
         }
      }

      this.Disposed = true;
   }
}


//usage

using(var cl = new MyClass())
{
   //Run some code using the class here
}

// Disposable method has been run at this point