Android ViewPager adapter

activity.java

ViewPagerAdapter pagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());

pagerAdapter.addPage( /*new fragment here*/ , /*title here*/);
pagerAdapter.addPage(/*new fragment here*/, /*title here*/);
//etc.

ViewPager viewPager = (ViewPager) findViewById(/*view pager*/);
viewPager.setAdapter(pagerAdapter);

activity.xml

<android.support.design.widget.CoordinatorLayout
    android:id="@+id/coordinatorLayout"
    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.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        
        <!-- toolbar -->
                ...................................
                
        <!-- tab layout -->
                ...................................
        
    </android.support.design.widget.AppBarLayout>    

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
        
</android.support.design.widget.CoordinatorLayout>

ViewPagerAdapter.java

package study.android.coordinatorlayout.adapter;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import java.util.ArrayList;

public class ViewPagerAdapter extends FragmentPagerAdapter {

    private ArrayList<Fragment> mFragmentList = new ArrayList<>();
    private ArrayList<String> mFragmentTitleList = new ArrayList<>();

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

    /**
     * Method for adding new ViewPage
     * @param fragment Fragment
     * @param title String
     */
    public void addPage(Fragment fragment, String title){
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}