app/src/main/java/net/ktnx/mobileledger/OnSwipeTouchListener.java

   1 package net.ktnx.mobileledger;
   2
   3 import android.content.Context;
   4 import android.util.Log;
   5 import android.view.GestureDetector;
   6 import android.view.GestureDetector.SimpleOnGestureListener;
   7 import android.view.MotionEvent;
   8 import android.view.View;
   9
  10 public abstract class OnSwipeTouchListener implements View.OnTouchListener {
  11     public final GestureDetector gestureDetector;
  12
  13     OnSwipeTouchListener(Context ctx) {
  14         gestureDetector = new GestureDetector(ctx, new GestureListener() );
  15     }
  16
  17     private final class GestureListener extends SimpleOnGestureListener {
  18         private static final int SWIPE_THRESHOLD = 100;
  19         private static final int SWIPE_VELOCITY_THRESHOLD = 100;
  20
  21         @Override
  22         public boolean onDown(MotionEvent e) {
  23             Log.d("sw-l", "onDown");
  24             return false;
  25         }
  26
  27         @Override
  28         public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
  29             boolean result = false;
  30
  31             Log.d("sw-l", "onFling");
  32
  33             try {
  34                 float diffX = e2.getX() - e1.getX();
  35                 float diffY = e2.getY() - e1.getY();
  36                 if (Math.abs(diffX) > Math.abs(diffY)) {
  37                     if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
  38                         if (diffX > 0) {
  39                             Log.d("sw-l", "calling onSwipeRight");
  40                             onSwipeRight();
  41                         }
  42                         else {
  43                             Log.d("sw-l", "calling onSwipeLeft");
  44                             onSwipeLeft();
  45                         }
  46                     }
  47                     result = true;
  48                 }
  49                 else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
  50                     if (diffY > 0) {
  51                         onSwipeDown();
  52                     }
  53                     else {
  54                         onSwipeUp();
  55                     }
  56                     result = true;
  57                 }
  58             }
  59             catch (Exception e) {
  60                 e.printStackTrace();
  61             }
  62
  63             return result;
  64         }
  65     }
  66
  67     public void onSwipeRight() {}
  68     public void onSwipeLeft() {
  69         Log.d("sw-l", "LEFT");
  70     }
  71     public void onSwipeUp() {}
  72     public void onSwipeDown() {}
  73 }