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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
Posted by 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
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
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?

hubertl
hubertl
8,483 Points
hubertl
hubertl
8,483 Points

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