安卓开源库ButterKnife的基本使用

矫情吗；* 2022-07-17 03:27 359阅读 0赞

1.project-level `build.gradle里加上`

buildscript {
      repositories {
        mavenCentral()
       }
      dependencies {
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
      }
    }

2.在gradle(module)里加上

apply plugin: 'android-apt'
    
    android {
      ...
    }
    
    dependencies {
      compile 'com.jakewharton:butterknife:8.2.1'
      apt 'com.jakewharton:butterknife-compiler:8.2.1'
    }

3. 基本使用1

1）替换对象

public void bind(ExampleActivity activity) {
      activity.subtitle = (android.widget.TextView) activity.findViewById(R.id.subtile);
      activity.footer = (android.widget.TextView) activity.findViewById(R.id.footer);
      activity.title = (android.widget.TextView) activity.findViewById(R.id.title);
    }

2）等效的替换代码

class ExampleActivity extends Activity {
      @BindView(R.id.title) TextView title;
      @BindView(R.id.subtitle) TextView subtitle;
      @BindView(R.id.footer) TextView footer;
    
      @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.simple_activity);
        ButterKnife.bind(this);
      }
    }

4. 基本使用之viewholder

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");
    
        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);
        }
      }
    }

[参考][Link 1]

[Link 1]: http://jakewharton.github.io/butterknife/