Android Studio Tutorial : Tab Fragment

public class MainActivity extends AppCompatActivity {
    private FragAdapter mfragAdapter;
    ViewPager mviewPager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mviewPager = findViewById(R.id.view_pager);
        setupViewPager(mviewPager);
        TabLayout tabLayout =  findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(mviewPager);
    }
    /*
    * This Adds the Fragments to the ViewPager and Sets title of the Tabs
    * */
    private void setupViewPager(ViewPager viewPager){
        FragAdapter adapter = new FragAdapter(getSupportFragmentManager());
        adapter.addFragment(new TabOne(),"TAB ONE");
        adapter.addFragment(new TabTwo(),"TAB TWO");
        viewPager.setAdapter(adapter);}}

<androidx.coordinatorlayout.widget.CoordinatorLayout 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=".MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:minHeight="?actionBarSize"
            android:padding="@dimen/appbar_padding"
            android:text="@string/app_name"
            android:textAppearance="@style/TextAppearance.Widget.AppCompat.Toolbar.Title" />

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/design_default_color_secondary" />
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

public class TabOne extends Fragment {
private static final String TAG = "TAB One Running";
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,
        @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_tab_one,
                container,false);
        return view;
    }
}

<LinearLayout 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=".TabOne">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginStart="150dp"
        android:text="This is tab one "
        android:textColor="#F40606"
        android:textSize="18sp"
        android:textStyle="bold" />
</LinearLayout>