Fragment navigation on back button

Question

I have a fragment which has a context menu which in turn calls another fragment:

switch (item.getItemId())
            {
 case MENU_EDIT:
                 FragmentTransaction ft =getActivity().getFragmentManager().beginTransaction();
                 PlayListDetailsView fragment=new PlayListDetailsView();
                 //fragment.getArguments().putLong("id", (Long)info.id);
                 ft.add(android.R.id.content, fragment);
                 ft.attach(fragment);
                 ft.commit();
}

The new fragment opens alright, but once i press back the app totally exits withour going back to the fragment it was called from. Also the commented line of an attempt to add a bundle information fails and cannot be retrieved in the fragment called Suggest a fix please :)

Answer 1

您必须在调用提交之前调用addToBackstack（） 。

Answer 2

First of all fragments should communicate through activity, not directly: http://developer.android.com/training/basics/fragments/communicating.html

As for your question:

1. For back key to work properly, you should add transaction to back stack, put this before commit:

    ft.addToBackStack("playlistdetails"); 

2. Arguments should be added like this:

    Bundle args = new Bundle(); args.putLong("id", (Long)info.id); fragment.setArguments(args);