Android Butterknife - binding in fragment

Question

I'm using Butterknife for the first time but something must be wrong. I have a fragment and a Listview and a TextView just for testing but Butterknife wont bind my variables:

public class MyFragment extends Fragment {

    @Bind(R.id.resultListView) ListView resultList;

    @Bind(R.id.textView1) TextView test;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);
        ButterKnife.bind(this, view);
        System.out.println(resultList); //null
        System.out.println(view.findViewById(R.id.resultListView)); //works
        System.out.println(test); //null
        System.out.println(view.findViewById(R.id.textView1)); //works
        return view;
    }

}

No exception or anything. Manual binding works so my Views must be there.

What do your dependencies look like? – kandroidj Dec 11 '15 at 17:06 — kandroidj, Dec 11 '15 at 17:06
I just have the Butterknife jar included. – breakline Dec 11 '15 at 17:08 — breakline, Dec 11 '15 at 17:08
ahh, so are you using eclipse? – kandroidj Dec 11 '15 at 17:08 — kandroidj, Dec 11 '15 at 17:08
Yes, unfortunately this project hasnt been updated yet. – breakline Dec 11 '15 at 17:11 — breakline, Dec 11 '15 at 17:11

Jonathan Nolasco Barrientos · Answer 1 · 2017-05-31T21:09:43.783

62

This work for me:

Gradle

compile 'com.jakewharton:butterknife:8.6.0'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.6.0'

Code

.
...

@BindView(R.id.text_input)
TextView text_input;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_home, container, false);
    ButterKnife.bind(this, view);
    return view;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    text_input.setText("Lorem Ipsum");
...
.

edited May 31 '17 at 21:09

answered Feb 27 '17 at 02:13

Jonathan Nolasco Barrientos

2,287
2
14
14

I copied `compile 'com.jakewharton:butterknife:8.6.0'` from another project but missed the `annoationProcesser`. Once I added this line and re-sync the project, it works like a a charm. Thanks. – John Pang Nov 27 '18 at 06:49

score 24 · Answer 2 · answered Sep 05 '17 at 14:29

24

also dont forget to release when you are finish :

 private Unbinder unbinder;

...

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.finalisation_step_fragment, container, false);
        unbinder = ButterKnife.bind(this, v);
        //initialize your UI

        return v;
    }

...

   @Override public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }

answered Sep 05 '17 at 14:29

Dagnogo Jean-François

1,292
16
16

6

I've never done this ever - is it specifically needed for fragments? – Someone Somewhere Mar 30 '18 at 02:19
2

Yes, it is specifically needed for fragments since it has a different lifecycle. This is mentioned in the documentation. – wseme Jun 10 '19 at 15:15

score 19 · Accepted Answer · answered Dec 11 '15 at 17:15

19

Code-wise, that looks just fine. So based on the comments, it looks like you need to setup the annotation processing in Eclipse: http://jakewharton.github.io/butterknife/ide-eclipse.html

answered Dec 11 '15 at 17:15

Dan Lew

85,990
32
182
176

Thanks, this has been done but interestingly the generated folder is empty. I didn't see that but I guess that has something to do with it? – breakline Dec 11 '15 at 17:20
What if you do a clean build? – Dan Lew Dec 11 '15 at 17:23
Same. I assume the annotation processor never gets called? – breakline Dec 11 '15 at 17:24
It sounds like it - perhaps this might be helpful? http://stackoverflow.com/a/26036146/60261 – Dan Lew Dec 11 '15 at 17:27
Thanks, my project looked just like that, but now it works after I restarted Eclipse fully. I guess Clean/Rebuild wasnt enough lol. After a restard Eclipse actually generated the files. – breakline Dec 11 '15 at 17:30

Android Butterknife - binding in fragment

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