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Android Build a Self-Destructing Message Android App Using Fragments for Tabs Understanding the Rest of the Pieces

hyunsoo hwang
hyunsoo hwang
3,910 Points

Where to set the button

I am getting an error message saying that 'For fragments, we must call the 'findViewById()' method from the 'rootView' that is created'. I can't really figure out where to place the button statement.

public class PhotoFragment extends Fragment {

    public Button mDeleteButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      mDeleteButton = (Button)findViewById(R.id.deleteButton);  
      View rootView = inflater.inflate(R.layout.fragment_photo, container, false);
        return rootView;
    }


}

I tried it setting it inside onCreatView() and I also tried it after onCreate() and before onCreateView()

public class PhotoFragment extends Fragment {

    public Button mDeleteButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    mDeleteButton = (Button)findViewById(R.id.deleteButton); 

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


}

I can't seem to get what I did wrong. Can someone please help me?

3 Answers

Steve Bedard
Steve Bedard
14,335 Points

try below View rootView in onCreateView

mDeleteButton = (Button)rootView.findViewById(R.id.deleteButton);
Seye Kuyinu
Seye Kuyinu
2,581 Points

I don't quite understand why I had to use rootView though Steve Bedard. Is this something you can explain?

Hi Seye

the code in the challenge looks as bellow:

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_photo, container, false);

        return rootView;
    }

if my understanding is correct the name of the fragment is called as rootView, therefore we calling from the same the delete button:

 mDeleteButton = (Button)rootView.findViewById(R.id.deleteButton);

Cheers, Hubert