How to store Fragment state in Android ViewPager

In this android programming source code example, we are going to store Fragment state in Android ViewPager.

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 store Fragment state in Android ViewPager

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.view.View;
import android.view.ViewGroup;

import com.bluapp.androidview.R;

public class TabLayoutAndViewPagerActivity13 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_pager13);
        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);
            }
        });

    }

    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;
        }
     @Override
        public void destroyItem(ViewGroup container, int position, Object object){
         ((ViewPager) container).removeView((View)object);
     }
    }

}

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