Create more Tabs and Fragments in the Fragment of BottomNavigationView

I made a note when I made BottomNavigationView once and made Tabhost and its fragment in it.
I mainly referred to the reference at the bottom, but I am fixing it because some errors occurred. First, it is one of each fragment divided by BottomNavigationView.

Parent fragment.java

public class parent fragment extends Fragment{
    public static Record newInstance() {
        return new Record();
    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.record, container, false);
        //Get Fragment Manager
        FragmentManager mFragmentManager = getChildFragmentManager();
        //Get FragmentTabHost from xml, id is android.R.id.Note that it is tabhost
        FragmentTabHost tabHost = (FragmentTabHost)v.findViewById(android.R.id.tabhost);
        Log.d("tabHost", String.valueOf(tabHost));
        //Set up by passing the Context, FragmentManager, and the id of the View that corresponds to the Fragment.
        tabHost.setup(getActivity().getApplicationContext(), mFragmentManager, R.id.content);
        //Pass any id as an argument of String type
        //This time, we will prepare two TabSpecs to switch between the two Fragments from the FragmentTabHost.
        TabHost.TabSpec mTabSpec1 = tabHost.newTabSpec("tab1");
        TabHost.TabSpec mTabSpec2 = tabHost.newTabSpec("tab2");
        //Pass the character to be displayed on Tab
        mTabSpec1.setIndicator("This is tab1");
        mTabSpec2.setIndicator("This is tab2");
        Bundle args = new Bundle();
        args.putString("string", "message");
        //Pass an argument to associate a class with each TabSpec
        //By having Bundle as the third argument, you can pass a value to Fragment. Pass null if not needed
        tabHost.addTab(mTabSpec1,Child fragment 1.class, args);
        tabHost.addTab(mTabSpec2,Child fragment 2.class, null);
        return v;

    }
}

Child fragment 1.java

public class child fragment 1 extends Fragment{
static child fragment 1 newInstance() {return new child fragment 1();}
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        //If you pass a Bundle during addTab, get the value from the Bundle
        //Do not pass(Passing null)In that case, it is not necessary to implement it. Otherwise getString("string")Sometimes an error occurs
        Bundle args = getArguments();
        String str = args.getString("string");
    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        return inflater.inflate(R.layout.Child fragment layout 1, null);
    }
}

Child fragment 2.java

public class child fragment 2 extends Fragment{
static child fragment 2 newInstance() {return new child fragment 2();}

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        return inflater.inflate(R.layout.Child fragment layout 2, null);
    }
}

Parent fragment layout.xml

<?xml version="1.0" encoding="utf-8"?>
<!--The id of FragmentTabHost must be@android:id/make it tabhost-->
<android.support.v4.app.FragmentTabHost
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!--Like FragmentTabHost, id is specified. id must be@android:id/to tabs-->
        <TabWidget
            android:id="@android:id/tabs"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"/>

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="0"/>

        <!--Fragment is added to content-->
        <FrameLayout
            android:id="@+id/content"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"/>

    </LinearLayout>
</android.support.v4.app.FragmentTabHost>

Child fragment layout.xml(Child fragment layout1,Child fragment layout2)

<?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:id="@+id/textView3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Child fragment" />
</LinearLayout>

Remarks:
There are "android.app.Fragment ~" and "android.support.v4.app.Fragment ~" in the Fragment system, but it seems better to unify them (naturally.)
[Android standard I am using v4 by referring to the article "Support.v4.app.Fragment should be used rather than Fragment" (http://qiita.com/LyricalMaestro0/items/a8bafa653fad23dead8e).

Reference:
FragmentTabHost Memorandum of Understanding