Android Working with TabLayout

/res/values/styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

/res/layout/toolbar_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimary"
    android:fitsSystemWindows="true"
    android:minHeight="?android:attr/actionBarSize"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

</android.support.v7.widget.Toolbar>

/res/layout_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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mahmood.a061.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <include
            layout="@layout/toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabGravity="fill"
            app:tabMode="fixed"></android.support.design.widget.TabLayout>

    </android.support.design.widget.AppBarLayout>


    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v4.view.ViewPager>

</RelativeLayout>

TabObject.java

public class TabObject {

    public TabObject(Fragment fragment, String title) {
        this.fragment = fragment;
        this.title = title;
    }

    public Fragment getFragment() {
        return fragment;
    }

    public void setFragment(Fragment fragment) {
        this.fragment = fragment;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    Fragment fragment;
    String title;
}

ViewPagerAdapter.java

public class ViewPagerAdapter extends FragmentPagerAdapter {

    ArrayList<TabObject> tabs=new ArrayList<>();

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

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

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

    public void addTab(TabObject tab)
    {
        tabs.add(tab);
    }

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

MainActivity.java

public class MainActivity extends AppCompatActivity {

    Toolbar toolbar;
    TabLayout tabLayout;
    ViewPager viewPager;
    ViewPagerAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        toolbar= (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        tabLayout= (TabLayout) findViewById(R.id.tabLayout);
        viewPager= (ViewPager) findViewById(R.id.viewPager);
        adapter=new ViewPagerAdapter(getSupportFragmentManager());


        TabObject tab1=new TabObject(new HomeFragment(),"Home");
        TabObject tab2=new TabObject(new TopFreeFragment(),"Top Free");
        TabObject tab3=new TabObject(new TopPaidFragment(),"Top Paid");

        adapter.addTab(tab1);
        adapter.addTab(tab2);
        adapter.addTab(tab3);

        viewPager.setAdapter(adapter);
        tabLayout.setupWithViewPager(viewPager);
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/061