Thursday, November 17, 2011

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.

Detect swipe using SimpleOnGestureListener

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. */
public void onCreate(Bundle savedInstanceState) {
gestureEvent = (TextView)findViewById(R.id.GestureEvent);

public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
return gestureDetector.onTouchEvent(event);

SimpleOnGestureListener simpleOnGestureListener
= new SimpleOnGestureListener(){

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";
swipe += "\n";

if((e1.getY() - e2.getY()) > sensitvity){
swipe += "Swipe Up\n";
}else if((e2.getY() - e1.getY()) > sensitvity){
swipe += "Swipe Down\n";
swipe += "\n";


return super.onFling(e1, e2, velocityX, velocityY);

GestureDetector gestureDetector
= new GestureDetector(simpleOnGestureListener);

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