Showing the first fragment after returning from the next tab

Question

I use ViewPager and Tabs. I have 3 tabs and in the first tab (Tab_1) I switch from FragmentA to FragmentB. Then I pass to the second tab (Tab_2). After that I return to Tab_1. Actually, it is the fragmentB that is showing but I want fragmentA to show when I return from Tab_2 to Tab_1. I want to have the same behavior when in tab1, I switch from FragmentA to FragmentB and if I pass to Tab_3 and return to Tab_1, it is the FragmentA that is showing. How can I do that?

Please attach some code for what you have done so far – Abhinav Suman Jan 29 '19 at 05:51 — Abhinav Suman, Jan 29 '19 at 05:51

score 0 · Answer 1 · answered Jan 26 '18 at 07:19

0

Did you try SetCurrentItem(int i) for ViewPager on Call of OnResume()

answered Jan 26 '18 at 07:19

Sahan Monaara

55
1
8

Did you mean on Call of `onResume()` in the `Fragment`? – Yoyo Jan 26 '18 at 09:11
No in the activity – Sahan Monaara Jan 26 '18 at 09:30
Yes but the `onResume()` isn't called if I switch from one tab to another – Yoyo Jan 26 '18 at 11:48

score 0 · Answer 2 · edited Jan 29 '19 at 05:45

in mainActivity add addtoBackStack method.follow below code.

private void loadfragment(Fragment fragment) {

        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.frame, fragment);
fragmentTransaction.addToBackStack("");

        fragmentTransaction.commit();

    }

    public void onBackPressed() {

        if (getFragmentManager().getBackStackEntryCount() > 0) {
            getFragmentManager().popBackStackImmediate();
        } else {

            super.onBackPressed();
        }

I already add this method but my problem is not about the back button, but with side by side tabs — Yoyo, Jan 26 '18 at 11:54

Kajol Chaudhary · Answer 3 · 2019-01-29T06:33:49.247

You can create a baseFragment which handles the back press navigation logic and extends that fragment to your fragment

public abstract class BackStackFragment extends Fragment {
    public static boolean handleBackPressed(FragmentManager fm)
    {
        if(fm.getFragments() != null){
            for(Fragment frag : fm.getFragments()){
                if(frag != null && frag.isVisible() && frag instanceof BackStackFragment){
                    if(((BackStackFragment)frag).onBackPressed()){
                        return true;
                    }
                }
            }
        }
        return false;
    }

    protected boolean onBackPressed()
    {
        FragmentManager fm = getChildFragmentManager();
        if(handleBackPressed(fm)){
            return true;
        } else if(getUserVisibleHint() && fm.getBackStackEntryCount() > 0){
            fm.popBackStack();
            return true;
        }
        return false;
    }

}

https://medium.com/@nilan/separate-back-navigation-for-a-tabbed-view-pager-in-android-459859f607e4

In above link, they have explained how to handle the tablayout and the back navigation of tablayout and change the fragment on backpressed

Kajol Chaudhary, while this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. [Answers that are little more than a link may be deleted.](//stackoverflow.com/help/deleted-answers) — 4b0, Jan 29 '19 at 06:28

Showing the first fragment after returning from the next tab

3 Answers3