Friday, February 10, 2012

Implement swiping page effect using GestureDetector and ViewFlipper

Refer to the exercise "Detect swipe using SimpleOnGestureListener" and "Bi-direction ViewFlipper". It's easy to implement swiping page effect using GestureDetector and ViewFlipper.



Modify the code of the activity from the last exercise "Bi-direction ViewFlipper".
package com.exercise.AndroidViewFlipper;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ViewFlipper;

public class AndroidViewFlipperActivity extends Activity {

ViewFlipper page;

Animation animFlipInForeward;
Animation animFlipOutForeward;
Animation animFlipInBackward;
Animation animFlipOutBackward;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

page = (ViewFlipper)findViewById(R.id.flipper);

animFlipInForeward = AnimationUtils.loadAnimation(this, R.anim.flipin);
animFlipOutForeward = AnimationUtils.loadAnimation(this, R.anim.flipout);
animFlipInBackward = AnimationUtils.loadAnimation(this, R.anim.flipin_reverse);
animFlipOutBackward = AnimationUtils.loadAnimation(this, R.anim.flipout_reverse);

}

private void SwipeRight(){
page.setInAnimation(animFlipInBackward);
page.setOutAnimation(animFlipOutBackward);
page.showPrevious();
}

private void SwipeLeft(){
page.setInAnimation(animFlipInForeward);
page.setOutAnimation(animFlipOutForeward);
page.showNext();
}

@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) {

float sensitvity = 50;
if((e1.getX() - e2.getX()) > sensitvity){
SwipeLeft();
}else if((e2.getX() - e1.getX()) > sensitvity){
SwipeRight();
}

return true;
}

};

GestureDetector gestureDetector
= new GestureDetector(simpleOnGestureListener);
}


Modify main.xml to remove buttons.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />

<ViewFlipper
android:id="@+id/flipper"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="@drawable/ic_launcher"/>
</LinearLayout>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center"
android:background="#C0C0C0">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="@drawable/ic_launcher"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="@drawable/ic_launcher"/>
</LinearLayout>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:gravity="center"
android:background="#A0A0A0">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="@drawable/ic_launcher"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="@drawable/ic_launcher"/>
</LinearLayout>

</ViewFlipper>
</LinearLayout>


Download the files.

Related exercise: Implement Animation using Java code

9 comments:

yonaides said...

Excelente Ejemplo,

Anonymous said...

Awsm

avshash said...

Thank you!

jiioh said...

CAN I ADD MORE VIEWS? 3 OR MORE?

Andr.oid Eric said...

hello jiioh,

I think what you are looking for is ViewPager.

Chelobotix said...

THX a lot you are the BEST man!

Anonymous said...

How about if I want my first view to have scrollView?

Tushar Patil said...

Awesome tutorial.

Thank you...:)

Tharaka Nirmana said...

Great tutorial. It was just a matter of few minutes. Thanks.