Android Open Source - PhotoStrips On Multi Tap Listener

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License

The source code is released under:

MIT License

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Java Source Code

package com.ahmetkizilay.image.photostrips.utils;
// w w  w .ja v a  2 s.com
import java.util.Timer;
import java.util.TimerTask;

import android.os.SystemClock;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

/***
 * Detects number of taps on the View.
 * I know this is not really implemented like a listener. I will most likely go back and modify it.
 * But it works.
 * @author ahmetkizilay
 *
 */
public abstract class OnMultiTapListener implements OnTouchListener{
  
  private final int MAX_TAP_DELAY = 500;
  
  private int tapCount = 0;  
  private long prevTapTime;
  
  private Timer timer = new Timer("multitap_timer");
  public OnMultiTapListener() {
    
  }
  
  public boolean onTouch(View v, MotionEvent event) {
    if(event.getAction() != MotionEvent.ACTION_DOWN) {
      return false;
    }
    
    long thisTapTime = SystemClock.uptimeMillis();
    if((thisTapTime - prevTapTime) > MAX_TAP_DELAY) {
      tapCount = 1;
      timer.cancel();
      
      (timer = new Timer("multitap_timer")).schedule(new TimerTask() {

        public void run() {
          onSingleTap();
          tapCount = 0;
        }
      }, MAX_TAP_DELAY);  
    }
    else {
      
      // increase tapCount;
      // cancel previous timer,
      // initialize timer for the next one
      
      tapCount++;
      timer.cancel();
      (timer = new Timer("multitap_timer")).schedule(new TimerTask() {

        public void run() {
          switch(tapCount) {
          case 2:
            onDoubleTap();
            break;
          default:
            onMultiTap(tapCount);
            break;
          }
          
          tapCount = 0;
        }
      }, MAX_TAP_DELAY);  
    }
        
    prevTapTime = thisTapTime;
    return false;
  }
  
  public abstract void onSingleTap();
  public abstract void onDoubleTap();
  public abstract void onMultiTap(int tapCount);
  
}

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