javaandroidandroid-fragmentsandroid-listfragment

FragmentManager know when a fragment resumed

I have a FragmentManager that I am using to add Fragments onto the backStack.

FragmentTransaction ft = getFragmentManager().beginTransaction();
PUCCoursesSubjectList detail = new PUCCoursesSubjectList();
detail.item = item;

ft.add(R.id.container_frame, detail, "courses_detail");
ft.addToBackStack(null);
ft.commit();

Once I have a few Fragments on the stack, I pop one off, but I need to know when the previous fragment is shown again.

It seems that onResume doesn't apply here. Is there another method that I should be using to know when a Fragment, that is already in the FragmentManger, appears?

Solution

  • When you pop your fragment, you could get your other fragment from the fragment manager by the tag you provided and call a public method in your fragment.

    YourFragment fragment = (YourFragment) getFragmentManager().findFragmentByTag("FRAGMENT_TAG");

if (fragment != null) {
   fragment.callMethod();
}