This example show how to detect user gesture by implementing GestureDetector.SimpleOnGestureListener. It have the same result as last exercise of "GestureDetector".

Example of using GestureDetector.SimpleOnGestureListener

GestureDetector.SimpleOnGestureListener provides an implementation for all of the on<TouchEvent> methods by returning false for all of them. Thus we can override only the methods we care about. In our application, we have to detect onFling() only. So we can extend GestureDetector.SimpleOnGestureListener instead of implementing the GestureDetector.OnGestureListener interface.

MainActivity.java
package com.example.androidviewflipper;

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.view.GestureDetectorCompat;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.Toast;
import android.widget.ViewFlipper;

public class MainActivity extends Activity{

private GestureDetectorCompat mDetector;

Button buttonPrev, buttonNext;
ViewFlipper viewFlipper;

Animation slide_in_left, slide_out_right;
Animation slide_in_right, slide_out_left;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mDetector = new GestureDetectorCompat(this, new MyGestureListener());

buttonPrev = (Button) findViewById(R.id.prev);
buttonNext = (Button) findViewById(R.id.next);
viewFlipper = (ViewFlipper) findViewById(R.id.viewflipper);

slide_in_left = AnimationUtils.loadAnimation(this,
R.anim.slide_in_left);
slide_out_right = AnimationUtils.loadAnimation(this,
R.anim.slide_out_right);

slide_in_right = AnimationUtils.loadAnimation(this,
R.anim.slide_in_right);
slide_out_left = AnimationUtils.loadAnimation(this,
R.anim.slide_out_left);

buttonPrev.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
viewFlipper.setInAnimation(slide_in_right);
viewFlipper.setOutAnimation(slide_out_left);
viewFlipper.showPrevious();
}
});

buttonNext.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
viewFlipper.setInAnimation(slide_in_left);
viewFlipper.setOutAnimation(slide_out_right);
viewFlipper.showNext();
}
});
;
}

@Override
public boolean onTouchEvent(MotionEvent event) {
this.mDetector.onTouchEvent(event);
return super.onTouchEvent(event);
}

class MyGestureListener extends GestureDetector.SimpleOnGestureListener {

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
float sensitvity = 50;

if((e1.getX() - e2.getX()) > sensitvity){
viewFlipper.setInAnimation(slide_in_right);
viewFlipper.setOutAnimation(slide_out_left);
viewFlipper.showPrevious();
Toast.makeText(MainActivity.this,
"Previous", Toast.LENGTH_SHORT).show();
}else if((e2.getX() - e1.getX()) > sensitvity){
viewFlipper.setInAnimation(slide_in_left);
viewFlipper.setOutAnimation(slide_out_right);
viewFlipper.showNext();
Toast.makeText(MainActivity.this,
"Next", Toast.LENGTH_SHORT).show();
}

return true;
}
}
}


Keep using the layout and animation XML files in the exercise of "Bi-direction sliding ViewFlipper".

download filesDownload the files.

 
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