Fragment detach() and attach() doesn't update view

Question

I have a navigation drawer in my Application and want to change the TextView in the Menu from Login (when no user is logged in) to My Account (when a user logs in). I use attach() and detach() methods to reload the fragment. However, the view doesn't seem to get updated. Using logs, I have verified that the piece of code executes correctly.

Here is the onClick action that happens when I click logout, which seems to successfully logout my user. SharedPrefs is a class used to manage SharedPreferences. The deletePrefs() method works good, because if I press logout and restart the application, the user is successfully logged out.

                case 2:
                SharedPrefs.deletePrefs(getContext());
                closeDrawer();

                NavigationDrawerFragment mNavigationDrawerFragment = MainActivity.getNavigationDrawerFragment();
                mNavigationDrawerFragment.setUserData("", "", BitmapFactory.decodeResource(getResources(), R.drawable.avatar));

                FragmentTransaction ft = getFragmentManager().beginTransaction();
                ft.detach(this).attach(this).commit();
                Log.d("Fragment", "detach, attach");
                break;

Here is the method that builds the Menu. It is called in the onCreateView() method of my Fragment.

  public List<NavigationItem> getMenu() {
        items = new ArrayList<NavigationItem>();
        items.add(new NavigationItem("Home", getResources().getDrawable(R.drawable.ic_home)));
        if (!SharedPrefs.isLogin(getContext()))
            items.add(new NavigationItem("Login", getResources().getDrawable(R.drawable.ic_login)));
        else
            items.add(new NavigationItem("My Account", getResources().getDrawable(R.drawable.ic_my_account)));
        items.add(new NavigationItem("Logout", getResources().getDrawable(R.drawable.ic_logout)));
        return items;
    }

When detaching and attaching, isn't onCreateView() executed again? Thus the Menu should get rebuilt and the TextView should change, right?

EDIT: So using logs, I see that the onCreateView() method is not called again when detaching and reattaching. Is this normal? Or am I detaching and reattaching the wrong way?

Why would onCreateView be executed again? The fragment view has already been created. — cyroxis, May 25 '16 at 16:27
@cyroxis Because detaching and attaching the fragment recreates the View, thus onCreateView is called again. Isn't that correct? — user3484582, May 25 '16 at 16:29
The answer is here: https://stackoverflow.com/a/51327440/4514796 — Ali Nem, Jul 13 '18 at 14:33
onCreateView is called but the view isn't updated. It has the previous view. can anyone help with this? — Zar Saeed, Dec 01 '18 at 05:43

score 0 · Answer 1 · edited Mar 04 '17 at 20:00

0

I also faced the same problem while using fragment update. I fixed it like this:

FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.detach(this).attach(this).commitAllowingStateLoss();

edited Mar 04 '17 at 20:00

Tunaki

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answered Mar 04 '17 at 19:52

Karthik Kamatchi

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Fragment detach() and attach() doesn't update view

1 Answers1