ViewPager with tabs code

ViewPager with tabs

// dependency for TabLayout
compile 'com.android.support:design:24.1.1'

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

        <include
            android:id="@+id/toolbar"
            layout="@layout/toolbar" >
        </include>
        
         <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="72dp"
            app:tabMode="fixed"
            app:tabGravity="fill"/>
</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" />
    
 // Java
 public class MainActivity extends AppCompatActivity {

    private TabLayout tabLayout;
    private ViewPager viewPager;
    TextView tabOne,tabTwo,tabThree,tabFour;

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

    /**
     * Adding fragments to ViewPager
     * @param viewPager
     */
    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFrag(new FeedFragment(), "ONE");
        adapter.addFrag(new NotifcationsFragment(), "TWO");
        adapter.addFrag(new SearchThemeFragment(), "THREE");
        adapter.addFrag(new ProfileFragment(), "FOUR");
        viewPager.setAdapter(adapter);
    }

    /**
     * Adding custom view to tab
     */
    private void setupTabIcons() {

        tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
        tabOne.setText("Questions");
        tabOne.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_question_white_tint, 0, 0);
        tabLayout.getTabAt(0).setCustomView(tabOne);

        tabTwo = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
        tabTwo.setText("Notifications");
        tabTwo.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_notifications, 0, 0);
        tabLayout.getTabAt(1).setCustomView(tabTwo);

        tabThree = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
        tabThree.setText("Recherche");
        tabThree.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_search, 0, 0);
        tabLayout.getTabAt(2).setCustomView(tabThree);

        tabFour = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
        tabFour.setText("Profil");
        tabFour.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_profil, 0, 0);
        tabLayout.getTabAt(3).setCustomView(tabFour);
    }

    class ViewPagerAdapter extends FragmentPagerAdapter { // every fragment should be imported from v4.Fragment and not support.Fragment
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();

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

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

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

        public void addFrag(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

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