Bufferknife(第三方注解)

最新推荐文章于 2023-04-03 09:27:39 发布

翻译最新推荐文章于 2023-04-03 09:27:39 发布 · 276 阅读

本文详细介绍Butterknife的工作原理及使用方法，包括其编译时注解解析过程、依赖配置方式，以及如何在Activity和Fragment中绑定视图组件，并通过实例展示了Butterknife简化视图操作的具体应用。

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● Butterknife

  ○ butterknife是在编译时，解析的注解
  ○ 只是通过注解解析器，生成了一套与原来的类几乎相同的代码
  ○ 生成时机，就是在编译的时候
  ○ 运行的时候，实际上运行的是重新生成的代码

module gradle

apply plugin: 'com.jakewharton.butterknife'

dependencies {
    compile 'com.jakewharton:butterknife:8.5.1'
    //    编译的时候的注解解析器，生成一套新的代码
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
}

根gradle

dependencies {
        classpath 'com.jakewharton:butterknife-gradle-plugin:8.5.1'
    }

例子

public class MainActivity extends AppCompatActivity {
    @BindView(R.id.tv_test1)
    TextView tvTest;
    @BindView(R.id.btn_test1)
    Button btnTest;
    @BindView(R.id.et_test1)
    EditText etTest1;
    @BindView(R.id.frameLayout)
    FrameLayout frameLayout;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        tvTest.setText("文本控件已被初始化");
        btnTest.setText("按钮被初始化");

    }

    @OnClick(R.id.btn_test1)
    public void onclick(View view) {
        btnTest.setText("我被点击了");
        tvTest.setText("夕阳西下几时回");
        FragmentManager supportFragmentManager = getSupportFragmentManager();
        supportFragmentManager.beginTransaction().add(R.id.frameLayout, new MFragment()).commit();
    }


}
```**fragment**





<div class="se-preview-section-delimiter"></div>

public class MFragment extends Fragment {

private List<String> list = new ArrayList<>();
Unbinder unbinder;
@BindView(R.id.lv_test1)
ListView lvTest1;
private View inflate;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    inflate = inflater.inflate(R.layout.frag1, container, false);
    initData();
    unbinder = ButterKnife.bind(this, inflate);
    lvTest1.setAdapter(new Madapter(list,getActivity()));
    return inflate;
}

private void initData() {
    for (int i = 0; i < 20; i++) {
        list.add("李强" + i);
    }
}


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

}

“`

public class MFragment extends Fragment {

    private List<String> list = new ArrayList<>();
    Unbinder unbinder;
    @BindView(R.id.lv_test1)
    ListView lvTest1;
    private View inflate;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        inflate = inflater.inflate(R.layout.frag1, container, false);
        initData();
        unbinder = ButterKnife.bind(this, inflate);
        lvTest1.setAdapter(new Madapter(list,getActivity()));
        return inflate;
    }

    private void initData() {
        for (int i = 0; i < 20; i++) {
            list.add("Coco" + i);
        }
    }


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

adapter

public class Madapter extends BaseAdapter {
    private List<String> list;
    private Context context;

    public Madapter(List<String> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        Log.d(TAG, "getView: ++++++++++++++"+list.size());
        ViewHolder viewHolder = null;
        if (view == null) {
            view = View.inflate(context, R.layout.item, null);
            viewHolder = new ViewHolder(view);
            view.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.getTextView().setText(list.get(i));
        return view;
    }

     class ViewHolder{
        @BindView(R.id.item_tv)
         TextView textView;

        public ViewHolder(View view) {
            ButterKnife.bind(this, view);
        }

        public TextView getTextView() {
            return textView;
        }
    }

}