有一个 ViewModel 类，有一个 xml，xml 绑定了 ViewModel .

1. @{click}

//xml://ViewModel:public void click(View view){}

2. 不带参数：@{() -> viewModel.click()}

//xml:

//ViewModel:public void click(){}

3. @{viewModel::click}

//xml:

//ViewModel:public void click(View view){}

tip: 如果是在其它类中设置点击方法，如 EventHandlers.java, 其实与上面一致

//xml:

// UI类：绑定handler,如绑定ViewModel那样EventHandlers handler = new EventHandlers();binding.setHandler(handler);// EventHandlers 执行click事件public void click(View view){  //do}

4. 带参数：@{() -> viewModel.click(obj.id)}

//xml:

//ViewModel:public void click(long id){   //do  }

5. ObservableField

//xml:  //IconView: public final ObservableField clickListener=new ObservableField<>();//xml所在的Activity类： binding.iconView.clickListener.set(new View.OnClickListener() {     @Override     public void onClick(View v) {       Toast.makeText(getApplicationContext(),"iconView",Toast.LENGTH_SHORT).show();     } });

6. 带参数

android:onClick="@{()->loadingModel.chooseLang(2)}" public void chooseLang(int language) {    LogUtil.i(TAG, "language=" + language); }

7. 带view的参数

//xml:android:onClick="@{(view)->listener.onCheckBoxClick(obj,view)}"//adapter: public void onCheckBoxClick(ToDo entity, View v) {    }