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  • 안드로이드 코딩을 좀 더 간단하게 "ButterKnife"
    모바일/Development 2014. 7. 27. 20:07
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    링크: https://github.com/JakeWharton/butterknife



    ButterKnife는 Annotation기능을 이용하여 코딩을 쉽게할 수 있는 방법입니다.


    ※ Bind를 시켜야 사용 가능 (Kotlin과 비슷)


    class Example extends Activity {
      @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.simple_activity);
    	
        // Bind 하세요.
        ButterKnife.bind(this);
      }
    }
    



     @BindView 를 이용하면 자동으로 ID 설정과 캐스트를 해줌

    // With ButterKnife
    @BindView(R.id.title) TextView title;
    
    @BindView(R.id.subtitle) TextView subtitle;
    
    @BindView(R.id.footer) TextView footer;
    
    @BindView(R.id.button1) Button button1;
    
    // Original
    subtitle= (TextView ) findViewById(R.id.subtitle);
    ...
    



    ETC

    View view = LayoutInflater.from(context).inflate(R.layout.thing, null);
    TextView firstName = ButterKnife.findById(view, R.id.first_name);
    TextView lastName = ButterKnife.findById(view, R.id.last_name);
    ImageView photo = ButterKnife.findById(view, R.id.photo);
    



    Resource Binding


    class ExampleActivity extends Activity {
      @BindString(R.string.title) String title;
      @BindDrawable(R.drawable.graphic) Drawable graphic;
      @BindColor(R.color.red) int red; // int or ColorStateList field
      @BindDimen(R.dimen.spacer) Float spacer; // int (for pixel size) or float (for exact value) field
    }
    


    ListAdapter의 Viewholder 심플화

    public class MyAdapter extends BaseAdapter {
      @Override public View getView(int position, View view, ViewGroup parent) {
        ViewHolder holder;
        if (view != null) {
          holder = (ViewHolder) view.getTag();
        } else {
          view = inflater.inflate(R.layout.whatever, parent, false);
          holder = new ViewHolder(view);
          view.setTag(holder);
        }
    
        holder.name.setText("John Doe");
        // etc...
    
        return view;
      }
    
      static class ViewHolder {
        @BindView(R.id.title) TextView name;
        @BindView(R.id.job_title) TextView jobTitle;
    
        public ViewHolder(View view) {
          ButterKnife.bind(this, view);
        }
      }
    }
    


    List Array 형식도 심플화 가능

    @BindViews({ R.id.first_name, R.id.middle_name, R.id.last_name })
    List nameViews;
    
    




    Click 기능 심플 (void 이름 자유)


    @OnClick(R.id.submit) void submit() {
        // TODO call server...
      }
    



    OnClick 예제





    지원

    OnClick, OnEditorAction, OnCheckedChanged, OnItemClick,

    OnItemSelected, OnLongClick, OnPageChange, OnTextChanged, OnTouch



    더 많은 기능이 있지만 http://jakewharton.github.io/butterknife/ 를 직접 참고


    ※주의※ Fragment binding reset

    public class FancyFragment extends Fragment {
      @BindView(R.id.button1) Button button1;
      @BindView(R.id.button2) Button button2;
      private Unbinder unbinder;
    
      @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fancy_fragment, container, false);
        unbinder = ButterKnife.bind(this, view);
        // TODO Use fields...
        return view;
      }
    
      @Override public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
      }
    }

    개발자: JakeWharton



    ButterKnife 사용을 위한 설정!



    앱 build.gradle 에


    dependencies { compile 'com.jakewharton:butterknife:8.7.0' annotationProcessor 'com.jakewharton:butterknife-compiler:8.7.0' }


    2015-04-07: ButterKnife 업데이트 대응 글 내용 변경 (InjectView -> FindView, inject -> bind)

    2016-08-17: ButterKnife v8.2.1

    2017-07-06: ButterKnife v8.6.0

    2017-07-09: ButterKnife v8.7.0

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