Changing Fragments inside Activity through onListItemClick()

Question

I have this Activity which at first shows a Fragment with a list of elements. This works perfectly with this code:

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list_act);

    if(null == savedInstanceState)
    {
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        ListFragment glfragment = new ListFragment();
        fragmentTransaction.add(R.id.listfrag1, glfragment);
        fragmentTransaction.commit();
    }

}

Well I have a ListFragment and a DetailFragment. But I don't know how to do the transition when I click an element of the list. I know the fragmentTransaction.replace(), but I don't know WHEN to call it.

I thought I should use the OnListItemClick() inside the ListFragment, but I don't know how to use the FragmentManager inside the Fragment and not in the main Activity... Also I want to "export" some data to the DetailFragment as if it was a Intent, but it's not.

score 2 · Accepted Answer · answered Jan 28 '14 at 11:15

2

To use the fragment manager inside your Fragment, simply call getActivity().getFragmentManager() instead of getFragmentManager(). Implementing this in your OnItemClickListener should suffice.

answered Jan 28 '14 at 11:15

Boni2k

3,255
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I tried this @Override public void onListItemClick(ListView l, View v, int position, long id) { FragmentManager fm = getActivity().getFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); DetailFragment df = new DetailFragment(); ft.replace(R.id.listfrag1, df); ft.commit(); } but it didn't work... – fcasanova Jan 28 '14 at 11:29
OK my problem was that my DetailFragment was a ListFragment... facepalm for me. It worked! – fcasanova Jan 28 '14 at 11:34

score 1 · Answer 2 · edited May 23 '17 at 12:03

What I would do is:

Define an interface with one method listItemSelected() with as an argument the id of the selected item
Let your activity implement this interface
In the onAttach of your list fragment, take the activity and keep it as a member variable, cast to the interface type. Make sure that in the onDetach you dereference it.
In your onListItemClick, call this method on your activity
In the activity, you can now do a new fragmenttransaction, this time you need to replace instead of add the fragment
To create your detail fragment with the correct argument (the id), use the method described here.

This should normally work fine.

Changing Fragments inside Activity through onListItemClick()

2 Answers2