TabHost d'une fragment

Bonjour
Je teste un bout de code pour génerer N fragments utilisant une meme base, avec un ViewPager.
Tout fonctionne tres bien, a une exception, Je n'arrive pas a récuperer le titre du tab courant:
Defois un code vaut mieux qu'on long discours :D

MainActivity2.xml

Code:

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<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.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:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
 
        <android.support.v7.widget.Toolbar
            android:id="@+id/mytoolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
 
        <android.support.design.widget.TabLayout
            android:id="@+id/mytabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMode="scrollable"
            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" />
</android.support.design.widget.CoordinatorLayout>

JAVA

Code:

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package com.ledoc.testtab;

import android.os.Bundle;
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.support.v7.widget.Toolbar;

import java.util.ArrayList;
import java.util.List;

    public class mainActivity2 extends AppCompatActivity{

        private Toolbar toolbar;
        private TabLayout tabLayout;
        private ViewPager viewPager;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.mainactivity2);

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

            viewPager = (ViewPager) findViewById(R.id.viewpager);
            setViewPager(viewPager);

            tabLayout = (TabLayout) findViewById(R.id.mytabs);
            tabLayout.setupWithViewPager(viewPager);

            TabLayout.Tab tab = tabLayout.getTabAt(2);
            tab.select();
        }

        private void setViewPager(ViewPager viewPager) {
            ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
            adapter.addFragment(new lvFragment(), "Movie");
            adapter.addFragment(new lvFragment(),"Music");
            adapter.addFragment(new lvFragment(), "Book");
            adapter.addFragment(new lvFragment(), "Movie2");
            adapter.addFragment(new lvFragment(),"Music2");
            adapter.addFragment(new lvFragment(), "Book2");
            adapter.addFragment(new lvFragment(), "Movie3");
            adapter.addFragment(new lvFragment(),"Music3");
            adapter.addFragment(new lvFragment(), "Book3");
            adapter.addFragment(new lvFragment(), "Movie4");
            adapter.addFragment(new lvFragment(),"Music4");
            adapter.addFragment(new lvFragment(), "Book4");
            viewPager.setAdapter(adapter);
        }

        class ViewPagerAdapter extends FragmentPagerAdapter
        {
            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) {
                setTitle(mFragmentTitleList.get(position).toString());
                return mFragmentList.get(position);
            }

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

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

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

Le fragment n'a rien d'interessant.

Lorsque je lance le projet, des que je clique sur «Book» j'affiche le suivant «Movie2».
L'appli a un comportement très bizarre.

Ca vous parle ?