Android数据绑定视图。onTouchListener

这里有一个解决方法,你可以用它来做这件事。

@BindingAdapter("touchListener")
public void setTouchListener(View self,boolean value){
    self.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent event) {
            // Check if the button is PRESSED
            if (event.getAction() == MotionEvent.ACTION_DOWN){
                //do some thing
            }// Check if the button is RELEASED
            else if (event.getAction() == MotionEvent.ACTION_UP) {
                //do some thing
            }
            return false;
        }
    });
}

<Button  app:touchListener="@{true}"/>

视图模型

public class RecyclerViewModel   {
      public View.OnTouchListener onTouchListener;

      public void setOnTouchListener( View.OnTouchListener onTouchListener) {
          this.onTouchListener = onTouchListener;
      }
}

数据绑定

@BindingAdapter("onTouchListener")
public static void setOnTouchListener(View view, View.OnTouchListener onTouchListener) {
    if (onTouchListener != null)
        view.setOnTouchListener(onTouchListener);
}

<Button app:onTouchListener="@{viewModel.onTouchListener}"/>

视图模型

private var tapTime: Long = 0

fun onTouchListener(view:View, event: MotionEvent): Boolean {
   when (event.action) {
      MotionEvent.ACTION_DOWN -> {
          tapTime = Date().time
          // more commands for touch down event
      } 
      MotionEvent.ACTION_UP -> {
         if (Date().time - tapDate < 300) {
            view.performClick()
           // more commands if click event
         } else {
           // any commands if holded toch on screen
         } 
     }
  }
  return true
}

<Button
   ...
   app:onTouchListener="@{viewModel.onTouchListener}"
   ...
  />

警告 您需要在ViewModel中使用正确的签名:

fun name(view:View, event: MotionEvent): Boolean

app:onTouchListener