Add Nested Fragment after Parent Fragment view is already created

Question

I am trying to create a Fragment which has a public method for adding child Fragments to itself. I've been reading through potentially similar questions but haven't found anything to help so far. I've reduced the problem down to a simple test app shown below. Once `fragA` has been added to the main layout, I call the public method `fragA.addFragB()` to get it to add an instance of FragmentClassB to itself, but this causes the test app to crash, indicating "Activity has been destroyed" (see LogCat at the end of the post). Does this mean `fragA` has been destroyed so I can't add `fragB` to it, or does it mean `fragB` has been destroyed so I can't add it to `fragA`? Or does it mean something else entirely? MainActivity.java ``` public class MainActivity extends FragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); FragmentManager fragMan = getSupportFragmentManager(); // add Fragment A…

Accepted Answer

You can not directly load the fragment which you have declared in `FragA`. The FragmentA will be loaded first and then after you can load the FragmentB by calling the method `addFragB()` from your `fragA's` `onCreateView()` method.

Try out as below:

Remove the line `fragA.addFragB();` from your MainActivity

```
public class MainActivity extends FragmentActivity {

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

FragmentManager fragMan = getSupportFragmentManager();

// add Fragment A to the main linear layout
        FragmentTransaction fragTrans = fragMan.beginTransaction();
        FragmentClassA fragA = new FragmentClassA();
        fragTrans.add(R.id.mainLinearLayout, fragA);
        fragTrans.addToBackStack("A");
        fragTrans.commit();

}

}
```

And try to load the `FragmentB` from `FragmentA` as below:

```
public class FragmentClassA extends Fragment {

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        addFragB(); //Call and load fragment B here.
        return inflater.inflate(R.layout.fragment_a, container, false);
    }

public void addFragB() {
        FragmentManager childFragMan = getChildFragmentManager();

FragmentTransaction childFragTrans = childFragMan.beginTransaction();
        FragmentClassB fragB = new FragmentClassB();
        childFragTrans.add(R.id.fragA_LinearLayout, fragB);
        childFragTrans.addToBackStack("B");
        childFragTrans.commit();

}
}
```

Add Nested Fragment after Parent Fragment view is already created

Solution

Problem