How to use findFragmentByTag inside nested Fragments with TabLayout

Question

Here I've nested TabLayouts inside a Fragment which is working so fine for me but not I just want to know how I can switch Tabs of TabLayouts when MainTabFragment is not in front of app. I searched for a long time and I found it's possible with findFragmentByTag but I don't know how I should use it in my case where I have to switch Tabs too. For more I'm writing my code too.

In MainActivity I'm switching Tabs when MainTabFragment is in front and calling that Fragment when it's not in front like:

 Fragment currentFragment = getSupportFragmentManager().findFragmentById(R.id.frame_container);
            if (currentFragment instanceof MainTabFragment) {  
           //Main Fragment
                MainTabFragment.pager.setCurrentItem(1);
          // Child Fragment of Main Fragment
                TopAdvisoryPagerFragment.pager.setCurrentItem(2);
            } else {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        fragment = new MainTabFragment();
                        changeFragments();                           
                    }
                }, 150);
            }
            mDrawerLayout.closeDrawer(mDrawerList);

  public void changeFragments() {

    if (fragment != null) {
        mPendingRunnable = new Runnable() {
            @Override
            public void run() {
                FragmentManager fragmentManager = getSupportFragmentManager();
                final Bundle bundle = new Bundle();
                bundle.putInt("pos_next", second_position);
                bundle.putInt("pos_end", third_position);
                fragment.setArguments(bundle);
                fragmentManager.beginTransaction().replace(R.id.frame_container, fragment, "TOP").addToBackStack(null).commit();
            }
        };        
        if (mDrawerLayout.isDrawerOpen(mDrawerList)) {
            mDrawerLayout.closeDrawer(mDrawerList);
        }

    } else {
        // error in creating fragment
        Log.e("MainActivity", "Error in creating fragment");
    }
}

http://stackoverflow.com/questions/18120510/dynamically-changing-the-fragments-inside-a-fragment-tab-host — Akhil Jayakumar, Dec 15 '15 at 05:45
Can you please explain it lil more because I've nested Fragments? — Anshul Tyagi, Dec 15 '15 at 05:47
You can make nested fragment tabs with actionbar sherlock [link](http://www.androidbegin.com/tutorial/android-actionbarsherlock-nested-fragment-tabs-tutorial/) — Akhil Jayakumar, Dec 15 '15 at 05:59
No..I have done everything. I just wanted to know lil bit more according of Toolbar ant tabLayout. Thanks — Anshul Tyagi, Dec 15 '15 at 06:00

score 0 · Answer 1 · answered Dec 15 '15 at 05:43

0

If I'm not wrong,

fragmentManager.beginTransaction().replace(com.cws.advisorymandi.R.id.frame_container, fragment, "TOP");

Tag refer to "TOP", if you have different fragment using the same tag, it would be difficult to switch. You could possibly change the code to

fragmentManager.beginTransaction().replace(com.cws.advisorymandi.R.id.frame_container, fragment, fragment.getClass().getSimpleName());

In this scenario, the tag will be your fragment class name.

answered Dec 15 '15 at 05:43

Ophitect

543
4
18

What you mean? I don't quite get what you're trying to achieve. – Ophitect Dec 15 '15 at 05:47
Ok. I have a MainActivity and MainTabFragment inside that. And MainTabFragment also has 3 more child fragments. So I can switch their Tabs also by using `findFragmentByTag` – Anshul Tyagi Dec 15 '15 at 05:48
Switch fragments when I `MainTabFragment` comes infront of app. – Anshul Tyagi Dec 15 '15 at 05:52
Do you have a app flow? – Ophitect Dec 15 '15 at 06:01
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/97925/discussion-between-anshul-tyagi-and-ophitect). – Anshul Tyagi Dec 15 '15 at 06:02

How to use findFragmentByTag inside nested Fragments with TabLayout

1 Answers1