Android implements monitoring touch events in Fragment

This article introduces you to the touch event implementation of monitoring Fragment. If you have a better mechanism, you can leave a message to communicate. Let’s take a look at the detailed introduction below:

Everyone knows that there areonTouchEventMethod, can be used to implement monitoring of touch events.

Touch events of activity

 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return (event);
 }

But forFragment, but there is no such method, if we are infragmentHow to implement it if you want to monitor touch events?

My method is to implement the distribution of touch events by myself.

Define an interface first

public interface MyOnTouchListener {
  public boolean onTouch(MotionEvent ev);
 }

Have another oneliststoragelistener

private ArrayList<MyOnTouchListener> onTouchListeners = new ArrayList<MyOnTouchListener>(
   10);

Then register, destroy and distribute yourself

fragmentTouch event distribution, distribute touch events to each responsivefragment

 @Override
 public boolean dispatchTouchEvent(MotionEvent ev) {
  for (MyOnTouchListener listener : onTouchListeners) {
   if(listener != null) {
    (ev);
   }
  }
  return (ev);
 }
 public void registerMyOnTouchListener(MyOnTouchListener myOnTouchListener) {
  (myOnTouchListener);
 }
 public void unregisterMyOnTouchListener(MyOnTouchListener myOnTouchListener) {
  (myOnTouchListener) ;
 }

Then infragmentWe can use it like this: initialize the listener, and thenactivityRegister and monitor gestures in the monitor at the same time.

  onTouchListener = new () {
   @Override
   public boolean onTouch(MotionEvent ev) {
    (ev);
    return false;
   }
  };
  ((MusicActivity) getActivity()).registerMyOnTouchListener(onTouchListener);

Summarize

The above is the entire content of this article. I hope the content of this article will be of some help to your study or work. If you have any questions, you can leave a message to communicate. Thank you for your support.