Question

I’m tring to add a fragment to an activity in order to avoid declaring the layout xml. I’m doing

@Override
protected void onCreate(Bundle arg0) {
    super.onCreate(arg0);
    getSupportFragmentManager().beginTransaction()
            .add(android.R.id.content, new mFragment()).commit();
} 

But it crashes with:

java.lang.IllegalStateException: The specified child already has a parent. 
You must call removeView() on the child's parent first.

Is there a short form for avoiding this error or I must recover the content layout before and remove all their views? Thanks

Edit mFragment Code:

public class mFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View result= inflater.inflate(R.layout.activity_main, container);
        return result;
    }

}

Answer 1

Change:

View result= inflater.inflate(R.layout.activity_main, container);

To:

View result= inflater.inflate(R.layout.activity_main, container, false);