Skip to main content

Swipe or OnFling Event Android

This  is a simple application Demonstrating Swipe or onFling() event on ListView.


you can download the source code of this project from  google drive  https://drive.google.com/folderview?id=0BySLpWhqmbbdSVB4M0hXb0VxcU0&usp=sharing
click on the above link ->sign into  your  google account ->add this to your google drive -> open it in google drive and download it.

1.Following is the MainActivity (DemoSwipe.java) of the application

package com.arun.demolistviewswipe;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class DemoSwipe extends Activity {
 ListView lvCountry;
 String[] country = { "India", "USA", "Russsia", "China", "Pakistan",
   "Canada", "UK" };
 SwipeGestureListener gestureListener;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  lvCountry = (ListView) findViewById(R.id.lv_country);
  ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
    DemoSwipe.this, android.R.layout.simple_list_item_1, country);
  lvCountry.setAdapter(arrayAdapter);
  gestureListener = new SwipeGestureListener(DemoSwipe.this);
  lvCountry.setOnTouchListener(gestureListener);

 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

 class SwipeGestureListener extends SimpleOnGestureListener implements
   OnTouchListener {
  Context context;
  GestureDetector gDetector;
  static final int SWIPE_MIN_DISTANCE = 120;
  static final int SWIPE_MAX_OFF_PATH = 250;
  static final int SWIPE_THRESHOLD_VELOCITY = 200;

  public SwipeGestureListener() {
   super();
  }

  public SwipeGestureListener(Context context) {
   this(context, null);
  }

  public SwipeGestureListener(Context context, GestureDetector gDetector) {

   if (gDetector == null)
    gDetector = new GestureDetector(context, this);

   this.context = context;
   this.gDetector = gDetector;
  }

  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
    float velocityY) {

   final int position = lvCountry.pointToPosition(
     Math.round(e1.getX()), Math.round(e1.getY()));

   String countryName = (String) lvCountry.getItemAtPosition(position);

   if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
    if (Math.abs(e1.getX() - e2.getX()) > SWIPE_MAX_OFF_PATH
      || Math.abs(velocityY) < SWIPE_THRESHOLD_VELOCITY) {
     return false;
    }
    if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this, "bottomToTop" + countryName,
       Toast.LENGTH_SHORT).show();
    } else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this,
       "topToBottom  " + countryName, Toast.LENGTH_SHORT)
       .show();
    }
   } else {
    if (Math.abs(velocityX) < SWIPE_THRESHOLD_VELOCITY) {
     return false;
    }
    if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this,
       "swipe RightToLeft " + countryName, 5000).show();
    } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this,
       "swipe LeftToright  " + countryName, 5000).show();
    }
   }

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

  }

  @Override
  public boolean onTouch(View v, MotionEvent event) {

   return gDetector.onTouchEvent(event);
  }

  public GestureDetector getDetector() {
   return gDetector;
  }

 }
}

>>>> To include Swipe  Event in our Activity we need a class which extends SimpleOnGestureListener and implements OnTouchListener  (SwipeGestureListener- in the above example). we need a constructor for this class and we need to @override the onFling(..),onTouch(..) events.Swipe event is controlled by OnFling() method. we can control LeftToRight ,RightToleft , BottomToTop, TopToBottom  swipe events using this.

@Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
    float velocityY) {

   final int position = lvCountry.pointToPosition(
     Math.round(e1.getX()), Math.round(e1.getY()));

   String countryName = (String) lvCountry.getItemAtPosition(position);

   if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
    if (Math.abs(e1.getX() - e2.getX()) > SWIPE_MAX_OFF_PATH
      || Math.abs(velocityY) < SWIPE_THRESHOLD_VELOCITY) {
     return false;
    }
    if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this, "bottomToTop" + countryName,
       Toast.LENGTH_SHORT).show();
    } else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this,
       "topToBottom  " + countryName, Toast.LENGTH_SHORT)
       .show();
    }
   } else {
    if (Math.abs(velocityX) < SWIPE_THRESHOLD_VELOCITY) {
     return false;
    }
    if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this,
       "swipe RightToLeft " + countryName, 5000).show();
    } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE) {
     Toast.makeText(DemoSwipe.this,
       "swipe LeftToright  " + countryName, 5000).show();
    }
   }

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

  }

>>> then we need to create  instance of the  SwipeGestureListener
in our mainActivity (DemoSwipe - in the above Example) and set the instance to the onTochEvent of the ListView .

 
SwipeGestureListener gestureListener;
gestureListener = new SwipeGestureListener(DemoSwipe.this);
lvCountry.setOnTouchListener(gestureListener);


2. Main.xml file  is given below 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/LinearLayout1"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >


    <ListView

        android:id="@+id/lv_country"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

    </ListView>


</LinearLayout>

Comments

  1. Adam Evans19 September 2013 at 01:57

    are your files available for downlaod?

    ReplyDelete
  2. VIVEK RAVI13 November 2013 at 01:03

    Thanks.It is working

    ReplyDelete
  3. Unknown29 May 2014 at 23:42

    e1 is always null, I can't get rid of it quite a while, so jelly to see that it once worked

    ReplyDelete
  4. Unknown18 August 2015 at 07:23

    Great Demo Thanks

    How can i implement Click Event of Listview??

    ReplyDelete
  5. Coder11 November 2016 at 03:11

    what is the use of SWIPE_THRESHOLD_VELOCITY = 200;

    ReplyDelete

Post a Comment

Popular posts

Android CardView And SQLite example

SQLite Database Android provides several options to save persistent application data. SQlite database is ideal for saving repeating and structured data . Using Sqlite we can save structured data in a private database.  This is a simple application showing use of Sqlite database in android . This example shows how to perform Insert , select , update and delete operation in  SQlite database Screenshots of our sample application                                                                                                                      This is a Registration app. New user can register by clicking registration button . Registered  users are shown in cards below that button . we can update or delete registered users by clicking overflow menu in each card. 1.First we need to create database for our application .    a. Create a contract class .Contract class contains constants that defines names of Tables and columns of our database. Contract class allows us
1 comment
Read more

Android List View using Custom Adapter and SQLite

following is a simple applicaton to create ListView using  Custom adapter.screenshot of the application  is like this . ListView is not used in android Anymore . We use  RecyclerView  and  CardView   in Android RecyclerView Demo is available on the following link http://androidtuts4u.blogspot.in/2017/04/android-recyclerview-example.html RecyclerView with Cardview Example is available on the following link http://androidtuts4u.blogspot.in/2017/09/android-card-view-example.html The ListView below the submit button is populated using Custom Adapter.Data is stored and retrieved using SQLite databsase. you can download the source code of this project from  google drive   https://drive.google.com/folderview?id=0BySLpWhqmbbdUXE5aTNhazludjQ&usp=sharing click on the above link ->sign into  your  google account ->add this to your google drive -> open it in google drive and download it. To create a simple application like this 1.  Create a class which extends  
76 comments
Read more

Google Sign-in for Android App

This is demo application implementing Google Sign-in in android application. Screenshots of the application are when you click on the sign in button popup will be shown to select google account for sign in . After signing in , user can see his profile photo,name and Email id in the login screen . User can sign out using signout button . Disconnect button will provide user ability to disconnect their google account from the app. Before we start coding for our application , we need to turn on sign-in API for our app in google developer console. Go to this link to know  how to turn on google sign-in api for our app https://androidtuts4u.blogspot.com/2019/09/enabling-sign-in-api-in-google.html now we successfully configured Google Api console project .  we can start coding our application. I . first we need to configure build.gradle file we need to add two dependencies   1. google play service dependency for google sign-in.    2 . we are using third party library
Post a Comment
Read more