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Android parmak hareketlerini algılama

avatar MerT Yılmaz
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Merhaba arkadaşlar,

Android ile geliştirdiğiniz uygulamalarda ekranda sağa, sola, yukarı ve aşağı parmak hareketlerini algılamak için aşağıdaki sınıftan faydalanabilirsiniz.



OnSwipeTouchListener.java :

 
Kod:
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class OnSwipeTouchListener implements OnTouchListener {

   private final GestureDetector gestureDetector;

   public OnSwipeTouchListener (Context ctx){
       gestureDetector = new GestureDetector(ctx, new GestureListener());
   }

   @Override
   public boolean onTouch(View v, MotionEvent event) {
       return gestureDetector.onTouchEvent(event);
   }

   private final class GestureListener extends SimpleOnGestureListener {

       private static final int SWIPE_THRESHOLD = 100;
       private static final int SWIPE_VELOCITY_THRESHOLD = 100;

       @Override
       public boolean onDown(MotionEvent e) {
           return true;
       }

       @Override
       public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
           boolean result = false;
           try {
               float diffY = e2.getY() - e1.getY();
               float diffX = e2.getX() - e1.getX();
               if (Math.abs(diffX) > Math.abs(diffY)) {
                   if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                       if (diffX > 0) {
                           onSwipeRight();
                       } else {
                           onSwipeLeft();
                       }
                   }
                   result = true;
               }
               else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                       if (diffY > 0) {
                           onSwipeBottom();
                       } else {
                           onSwipeTop();
                       }
                   }
                   result = true;

           } catch (Exception exception) {
               exception.printStackTrace();
           }
           return result;
       }
   }

   public void onSwipeRight() {
   }

   public void onSwipeLeft() {
   }

   public void onSwipeTop() {
   }

   public void onSwipeBottom() {
   }
}


Kullanımı :
 
Kod:
imageView.setOnTouchListener(new OnSwipeTouchListener(MyActivity.this) {
   public void onSwipeTop() {
       Toast.makeText(MyActivity.this, "top", Toast.LENGTH_SHORT).show();
   }
   public void onSwipeRight() {
       Toast.makeText(MyActivity.this, "right", Toast.LENGTH_SHORT).show();
   }
   public void onSwipeLeft() {
       Toast.makeText(MyActivity.this, "left", Toast.LENGTH_SHORT).show();
   }
   public void onSwipeBottom() {
       Toast.makeText(MyActivity.this, "bottom", Toast.LENGTH_SHORT).show();
   }

});
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