Detect swipe using SimpleOnGestureListener

Last exercise demonstrate how to "Using GestureDetector with SimpleOnGestureListener". In this exercise, we modify the SimpleOnGestureListener to detect swipe by overriding onFling() method.

package com.exercise.AndroidSimpleGesture;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.widget.TextView;

public class AndroidSimpleGestureActivity extends Activity {
 
 TextView gestureEvent;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       gestureEvent = (TextView)findViewById(R.id.GestureEvent);
   }
  
   @Override
 public boolean onTouchEvent(MotionEvent event) {
  // TODO Auto-generated method stub
    return gestureDetector.onTouchEvent(event);
 }

 SimpleOnGestureListener simpleOnGestureListener
   = new SimpleOnGestureListener(){


  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
    float velocityY) {
   String swipe = "";
   float sensitvity = 50;
   
   // TODO Auto-generated method stub
   if((e1.getX() - e2.getX()) > sensitvity){
    swipe += "Swipe Left\n";
   }else if((e2.getX() - e1.getX()) > sensitvity){
    swipe += "Swipe Right\n";
   }else{
    swipe += "\n";
   }
   
   if((e1.getY() - e2.getY()) > sensitvity){
    swipe += "Swipe Up\n";
   }else if((e2.getY() - e1.getY()) > sensitvity){
    swipe += "Swipe Down\n";
   }else{
    swipe += "\n";
   }
   
   gestureEvent.setText(swipe);
   
   return super.onFling(e1, e2, velocityX, velocityY);
  }
   };
  
   GestureDetector gestureDetector
   = new GestureDetector(simpleOnGestureListener);
}

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