Fragment Replacing Existing Fragment

Question

I have the MainActivity, it contains ListFragment and framelayout, I am able to change the fragments on list on item click.

I have a problem to replace the existing

Answer 1

You need to use .replace to switch the two fragments, you also need add add the original to the backstack so you can recall it, and you need to override the back key operation to function that way. It would look something like this (using code from one of my projects, using the support library):

To show your first fragment:

menu = new MenuFragment_Main();   // instantiate fragment
getSupportFragmentManager().beginTransaction().replace(R.id.pane, menu).commit();  // display fragment

To swap it for the new fragment and add it to the backstack:

ListFragment_ShopListItem shoplist = new ListFragment_ShopListItem();  // instantiate fragment
getSupportFragmentManager().beginTransaction().replace(R.id.pane, shoplist).addToBackStack(null).commit();  //  replace original fragment with new fragment, add original to backstack

And to override the back key to go back to the previous fragment:

public void onBackPressed() {
    FragmentManager fm = getActivity().getSupportFragmentManager();
    fm.popBackStack();
    return;
}