Android : Parent fragment of a nested fragment

Question

A getParentFragment() from my nested fragment is returning a null. I realise that getting a null means that the fragment is attached to the activity and not to the nested container fragment. But I am explicitly nesting the child fragment inside the parent fragment using the child FragmentManager and thus think that I should not be getting a null. Could you tell me what I am missing?

Parent fragment

public class UsageBreakUp extends Fragment implements Filter.OnFragmentInteractionListener {

  ....

  @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        getChildFragmentManager().beginTransaction().add(R.id.filter, new Filter()).commit();
    }

...

}

Child fragment

public class Filter extends Fragment {

...


    public Filter() {
        if (getParentFragment() == null)
            Log.d(LOG_TAG, "parent fragment is null");
    }

...

}

@SweetWisherツ, I have already. It isn't helping. I've updated my question with this information. — Abhijith Madhav, Nov 18 '14 at 10:12
what about [this](http://stackoverflow.com/a/22501774/2591002)?? and are you sure you getting *getParentFragment()* NULL?? because it seems you are trying to cast Fragment to a listener which is throwing an exception — SweetWisher ツ, Nov 18 '14 at 10:14
try this code : `UsageBreakUp = (UsageBreakUp) getParentFragment();` and tell me the output.. post LOGCAT too — SweetWisher ツ, Nov 18 '14 at 10:15
@SweetWisherツ, It is `getParentFragement()` manager that is returning `null`. I have edited my question to make this point clear. — Abhijith Madhav, Nov 18 '14 at 10:20
[Once go though this](https://gist.github.com/noxi515/4259065) — SweetWisher ツ, Nov 18 '14 at 10:22

Abhijith Madhav · Accepted Answer · 2014-11-19T19:26:00.067

49

I was calling getParentFragment() in the constructor of the child fragment and thus before the child fragment was fully created. Shifting getParentFragment() to onCreateView() solved the problem. Shifting wasn't an issue as I was calling getParentFragment() to check if the parent fragment had implemented a child fragment interaction listener.

edited Nov 19 '14 at 19:26

answered Nov 18 '14 at 10:34

Abhijith Madhav

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1

I am getting the null even if I call from `onCreateView` as `this.parentFragment` in kotlin. Any solution for this? – shafeeq Jan 27 '21 at 04:44
1

My error happens because I had used `activity.supportFragmantManager` instead of `childFragmentManager` – shafeeq Jan 27 '21 at 05:04

Android : Parent fragment of a nested fragment

1 Answers1