CODEWITHSUNDEEP
androidandroid-fragments
user1906825
user1906825

Reputation: 185

Android FindFragmentByTag returns null in FragmentTabHost

I am trying to retrieve a fragment from my fragmentTabHost:

private void initView() {
    FragmentTabHost mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
    mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);

    mTabHost.addTab(mTabHost.newTabSpec("summary").setIndicator("Summary"),
            SummaryActivity.class, bundle);

    SummaryActivity summaryActivity = (SummaryActivity) getSupportFragmentManager().findFragmentByTag("summary");
    System.out.println(summaryActivity);
}

When I try to get my fragment immediately after it was created, it returns null. It could be a thread issue. How, or even when, should I call getFragmentByTag to retrieve my fragment in this case?

Upvotes: 1

Views: 878

Answers (2)

Kartihkraj Duraisamy
Kartihkraj Duraisamy

Reputation: 3221

The Fragment you are looking for is not in the stack. It is not even added/present at the time you are finding it back.

findFragmentByTag method will look and match last fragment that added in the transaction, if that is not matching with the required one, then it will search with the available list from history. Finally if your tag is not there with any fragments it will return null.

Make sure that , you are adding the Fragment to the view first.

the view should receive the fragment/tabhost to make it available in the lifecycle.

you have to return your tabHost to the view to add the fragment before you do findFragmentByTag lookup.

For ex:

You are in your Fragment's onCreateView then you should do return the tabhost to the view after you inflated it.

onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mTabHost = new FragmentTabHost(getActivity());
        mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.fragment1);

        mTabHost.addTab(mTabHost.newTabSpec("fragmenttag").setIndicator("Fragmenttag"),
                FragmentStackSupport.CountingFragment.class, null);

        return mTabHost;
}

Then probably your Fragment will be available in back stack , you can get it back by Tag.

Upvotes: 2

Gabe
Gabe

Reputation: 146

Fragment Tags can only be set during fragment transactions. The tab host tag refers to something else. Try using findFragmentById() if you set an id on the fragments root view.

Upvotes: 0

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