IllegalStateException: Fragment already added appears if a App was very long in the background

Question

Hello I am using `fragment` in my android application but I see some strange exception `java.lang.IllegalStateException: Fragment already added` appears if a App was very long in the background. I checked this https://code.google.com/p/android/issues/detail?id=61247, java.lang.IllegalStateException: Fragment already added but how this I can check whether fragment is already added in case when I add the `fragment` in the `FragmentTabHost` Source Code : ``` public class FirstFragment extends SherlockFragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mTabHost = new FragmentTabHost(getSherlockActivity()); mTabHost.setup(getSherlockActivity(), getChildFragmentManager(), R.layout.registration); // Create Child Tab1 mTabHost.addTab(mTabHost.newTabSpec("child1").setIndicator("Registration"), RegistrationFragment.class, null); } } ``` StackTrace ``` java.lang.IllegalStateException: Fragment already added: RegistrationFragmen…

Accepted Answer

Check if the fragment already exists before adding :

```
Fragment f = mManager.findFragmentById(R.id.fragment_id);
if(f != null && f instanceof FragmentClassName) {
   //Fragment already exists
} else {
   //Add Fragment
}
```

IllegalStateException: Fragment already added appears if a App was very long in the background

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