How to detect ViewPager onPageChange listener in Android

In this android programming source code example, we are going to detect when a ViewPager on page change in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to detect when a ViewPager on page change in Android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ededed">

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/material_blue_grey_800"
        app:tabGravity="fill"
        app:tabIndicatorColor="@color/colorPrimary"
        app:tabMode="scrollable"
        app:tabSelectedTextColor="@color/colorPrimary"
        app:tabTextColor="@color/white" />

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/tabs"/>


</RelativeLayout>

MainActivity.java

import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;


public class TabLayoutAndViewPagerActivity19 extends AppCompatActivity {
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private int int_items = 5 ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab_layout_and_view_pager19);
        tabLayout = (TabLayout) findViewById(R.id.tabs);
        viewPager = (ViewPager) findViewById(R.id.viewpager);

        viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));

        tabLayout.post(new Runnable() {
            @Override
            public void run() {
                tabLayout.setupWithViewPager(viewPager);
            }
        });

        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i1) {
                Toast.makeText(TabLayoutAndViewPagerActivity19.this,"viewpager change",Toast.LENGTH_LONG).show();
            }

            @Override
            public void onPageSelected(int i) {

            }

            @Override
            public void onPageScrollStateChanged(int i) {

            }
        });

    }

    private class MyAdapter extends FragmentPagerAdapter {

        public MyAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            switch (position){
                case 0 : return new TabFragment();
                case 1 : return new TabFragment();
                case 2 : return new TabFragment();
                case 3 : return new TabFragment();
                case 4 : return new TabFragment();
            }
            return null;
        }

        @Override
        public int getCount() {
            return int_items;
        }

        @Override
        public CharSequence getPageTitle(int position) {

            switch (position){
                case 0 :
                    return "TabLayout1";
                case 1 :
                    return "TabLayout2";
                case 2 :
                    return "TabLayout3";
                case 3 :
                    return "TabLayout4";
                case 4 :
                    return "TabLayout5";
            }
            return null;
        }
    }
}

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