Why are Fragments not showing with TabLayout?

Question

Java

The bottom line is that there is a Drawer in it 6 Items when you open the application, we immediately stand on the first Item and when we move on its Tab, the text changes. But when I open the 2nd Item, the text remains the same as in the first Tab, that is, it does not change at all. I visited activity_main.xml to connect 2 ViewPager-a then the texts will overlap each other.
This is activity_main.xml code

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    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:fitsSystemWindows="true"
    android:orientation="vertical">

    <android.support.design.widget.CoordinatorLayout
        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">

        <include
            layout="@layout/toolbar">
        </include>

        <android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:tabIndicatorColor="@android:color/white"
            app:tabIndicatorHeight="2dp"
            app:tabSelectedTextColor="@android:color/white"
            app:tabTextColor="@android:color/white" />

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

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


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

</android.support.v4.widget.DrawerLayout>

piece of MainActivity.java code

@Override
            protected void onCreate(Bundle savedInstanceState) {
                setTheme(R.style.myTheme2);
                super.onCreate(savedInstanceState);
                setContentView(LAYOUT);
                initTabs();


                // Инициализируем Toolbar
                Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
                if (toolbar !=null) {
                    setSupportActionBar(toolbar);
                    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
                }

                initializeNavigationDrawer(toolbar);
            }

    private void initTabs() {
        viewPager = (ViewPager) findViewById(R.id.viewPager);
        // Инициализируем TabLayout

        TabLayout tabLayout = (TabLayout)findViewById(R.id.tabLayout);
        TabFragmentFish adapter = new TabFragmentFish(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
        tabLayout.setupWithViewPager(viewPager);



    }

    @Override
    public void onBackPressed() {
        if (drawerMenu != null && drawerMenu.isDrawerOpen()) {
            drawerMenu.closeDrawer();
        } else {
            super.onBackPressed();
        }
    }

    //Инициализация Дравера
    private void initializeNavigationDrawer(Toolbar toolbar) {
                drawerMenu = new Drawer()
                .withActivity(this)
                .withToolbar(toolbar)
                .withActionBarDrawerToggle(true)
                .withHeader(R.layout.drawer_header)
                //Добавление Итемов в шторку
                .addDrawerItems(
                        new PrimaryDrawerItem()
                                .withName(R.id.aqua_fish)
                                .withIdentifier(1)
                                .withIcon(FontAwesome.Icon.faw_circle),
                        new PrimaryDrawerItem()
                                .withName(R.id.aqua_plant)
                                .withIdentifier(2)
                                .withIcon(FontAwesome.Icon.faw_leaf),
                        new PrimaryDrawerItem()
                                .withName(R.id.aqua_water)
                                .withIdentifier(3)
                                .withIcon(FontAwesome.Icon.faw_tint),
                        new PrimaryDrawerItem()
                                .withName(R.id.aqua_lighting)
                                .withIdentifier(4)
                                .withIcon(FontAwesome.Icon.faw_lightbulb_o),
                        new PrimaryDrawerItem()
                                .withName(R.id.aqua_co2)
                                .withIdentifier(5)
                                .withIcon(FontAwesome.Icon.faw_circle),
                        new PrimaryDrawerItem()
                                .withName(R.id.aqua_filtration)
                                .withIdentifier(6)
                                .withIcon(FontAwesome.Icon.faw_filter),
                        //--------------------------------------------- Secondary
                        new DividerDrawerItem(),
                        new SecondaryDrawerItem()
                                .withName(R.id.about)

                                .withIdentifier(7),
                        new SecondaryDrawerItem()
                                .withIdentifier(8)
                                .withName(R.id.exit))
                        //Реализуем клик по айтэмам
                        .withOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
                            @Override
                            public void onItemClick(AdapterView<?> parent, View view, int position, long id, IDrawerItem drawerItem) {
                                TabLayout tabLayout = (TabLayout)findViewById(R.id.tabLayout);
                                switch (drawerItem.getIdentifier()){

                                    case 1:
                                        TabFragmentFish adapter = new TabFragmentFish(getSupportFragmentManager());
                                        viewPager.setAdapter(adapter);
                                        tabLayout.setupWithViewPager(viewPager);
                                        break;

                                    case 2:
                                        TabFragmentAdapterPlants adapterPlants = new TabFragmentAdapterPlants(getSupportFragmentManager());
                                        viewPager.setAdapter(adapterPlants);
                                        tabLayout.setupWithViewPager(viewPager);
                                        break;

                                    //Мини окошко "Об авторе с закрытием ОК"
                                    case 7:
                                        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AppCompatAlertDialogStyle);
                                        builder
                                                .setTitle("Об авторе")
                                                .setMessage("Автор:Артем Мишуровский"+"\n\nEmail: [email protected]")
                                                .setCancelable(false)
                                                .setNegativeButton("Ок", new DialogInterface.OnClickListener() {
                                                    @Override
                                                    public void onClick(DialogInterface dialogInterface, int i) {
                                                        dialogInterface.cancel();
                                                    }
                                                });
                                        AlertDialog alertDialog = builder.create();
                                        alertDialog.show();
                                        break;
                                    //Выход из программы
                                    case 8:
                                        finish();
                                        break;
                                }
                            }
                        })
                .build();

Pieces of code from one of the fragments

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import house.naturalaquarium.R;


public class FragmentPlants extends Fragment {

    private static final int LAYOUT = R.layout.fragments_plants2;

    private View view;

    public static FragmentPlants getInstance() {
        Bundle args = new Bundle();
        FragmentPlants fragmentPlants = new FragmentPlants();
        fragmentPlants.setArguments(args);

        return fragmentPlants;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(LAYOUT, container, false);
        return view;
    }
}

A piece of CML of the same fragment

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:text="#plants"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textView2"
        android:layout_margin="50dp"
        android:textSize="30sp"
        android:textStyle="normal|bold"
        android:textColor="@color/common_google_signin_btn_text_dark_focused" />

</LinearLayout>

Answer 1

AP