Android Open Source - TimeTable Simple Gesture Filter

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License

The source code is released under:

MIT License

Java Source Code

package uk.me.timlittle.tt1;
/*// w w  w  .  j av  a2s  . com
 * From http://androidexample.com/Swipe_screen_left__right__top_bottom/index.php?view=article_discription&aid=95&aaid=118
 */
import android.app.Activity;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
 
public class SimpleGestureFilter extends SimpleOnGestureListener{
      
         public final static int SWIPE_UP    = 1;
         public final static int SWIPE_DOWN  = 2;
         public final static int SWIPE_LEFT  = 3;
         public final static int SWIPE_RIGHT = 4;
          
         public final static int MODE_TRANSPARENT = 0;
         public final static int MODE_SOLID       = 1;
         public final static int MODE_DYNAMIC     = 2;
          
         private final static int ACTION_FAKE = -13; //just an unlikely number
         private int swipe_Min_Distance = 100;
         private int swipe_Max_Distance = 350;
         private int swipe_Min_Velocity = 100;
      
     private int mode             = MODE_DYNAMIC;
     private boolean running      = true;
     private boolean tapIndicator = false;
      
     private Activity context;
     private GestureDetector detector;
     private SimpleGestureListener listener;
      
     public SimpleGestureFilter(Activity context,SimpleGestureListener sgl) {
      
      this.context = context;
      this.detector = new GestureDetector(context, this);
      this.listener = sgl;
     }
      
     public void onTouchEvent(MotionEvent event){
      
       if(!this.running)
      return; 
      
       boolean result = this.detector.onTouchEvent(event);
      
       if(this.mode == MODE_SOLID)
        event.setAction(MotionEvent.ACTION_CANCEL);
       else if (this.mode == MODE_DYNAMIC) {
      
         if(event.getAction() == ACTION_FAKE)
           event.setAction(MotionEvent.ACTION_UP);
         else if (result)
           event.setAction(MotionEvent.ACTION_CANCEL);
         else if(this.tapIndicator){
          event.setAction(MotionEvent.ACTION_DOWN);
          this.tapIndicator = false;
         }
      
       }
       //else just do nothing, it's Transparent
     }
      
     public void setMode(int m){
      this.mode = m;
     }
      
     public int getMode(){
      return this.mode;
     }
      
     public void setEnabled(boolean status){
      this.running = status;
     }
      
     public void setSwipeMaxDistance(int distance){
      this.swipe_Max_Distance = distance;
     }
      
     public void setSwipeMinDistance(int distance){
      this.swipe_Min_Distance = distance;
     }
      
     public void setSwipeMinVelocity(int distance){
      this.swipe_Min_Velocity = distance;
     }
      
     public int getSwipeMaxDistance(){
      return this.swipe_Max_Distance;
     }
      
     public int getSwipeMinDistance(){
      return this.swipe_Min_Distance;
     }
      
     public int getSwipeMinVelocity(){
      return this.swipe_Min_Velocity;
     }
      
     @Override
         public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
           float velocityY) {
          
          final float xDistance = Math.abs(e1.getX() - e2.getX());
          final float yDistance = Math.abs(e1.getY() - e2.getY());
          
          if(xDistance > this.swipe_Max_Distance || yDistance > this.swipe_Max_Distance)
           return false;
          
          velocityX = Math.abs(velocityX);
          velocityY = Math.abs(velocityY);
                boolean result = false;
          
          if(velocityX > this.swipe_Min_Velocity && xDistance > this.swipe_Min_Distance){
           if(e1.getX() > e2.getX()) // right to left
            this.listener.onSwipe(SWIPE_LEFT);
           else
            this.listener.onSwipe(SWIPE_RIGHT);
          
           result = true;
          }
          else if(velocityY > this.swipe_Min_Velocity && yDistance > this.swipe_Min_Distance){
           if(e1.getY() > e2.getY()) // bottom to up
            this.listener.onSwipe(SWIPE_UP);
           else
            this.listener.onSwipe(SWIPE_DOWN);
          
           result = true;
          }
          
           return result;
         }
      
     @Override
     public boolean onSingleTapUp(MotionEvent e) {
      this.tapIndicator = true;
      return false;
     }
      
     @Override
     public boolean onDoubleTap(MotionEvent arg) {
      this.listener.onDoubleTap();;
      return true;
     }
      
     @Override
     public boolean onDoubleTapEvent(MotionEvent arg) {
      return true;
     }
      
     @Override
     public boolean onSingleTapConfirmed(MotionEvent arg) {
      
      if(this.mode == MODE_DYNAMIC){        // we owe an ACTION_UP, so we fake an
         arg.setAction(ACTION_FAKE);      //action which will be converted to an ACTION_UP later.
         this.context.dispatchTouchEvent(arg);
      }  
      
      return false;
     }
      
        static interface SimpleGestureListener{
         void onSwipe(int direction);
         void onDoubleTap();
     }
      
    }

Java Source Code List

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