Where to write code?

Question

Android

I use fragment to display listview, clicking on listview will bring up another fragment with data (text). Therefore, you need to connect the arrayadapter and addlistener to the item listview. The question is, where is the best place in the code to write all this?
MainActivity

public class MainActivity extends AppCompatActivity{

    FragmentManager fragmentManager;
    FragmentTransaction fragmentTransaction;
    FragmentList fragmentList;

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

        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();

        fragmentList = new FragmentList();

        fragmentTransaction.add(R.id.container, fragmentList);

        fragmentTransaction.commit();

    }

layout MainActivity

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.anton.auto.Activity.MainActivity"
    tools:showIn="@layout/app_bar_main">

    <LinearLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="0dp"
        android:layout_marginLeft="0dp"
        android:layout_marginRight="0dp"
        android:layout_marginTop="0dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

FragmentList

public class FragmentList extends Fragment{

    ListView listView;

    ArrayAdapter<String> arrayAdapter;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.list_fragment, null, false);
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onStart() {
        super.onStart();

        listView = (ListView) getActivity().findViewById(R.id.listView);
        String[] array = getResources().getStringArray(R.array.basis);
        arrayAdapter = new ArrayAdapter<>(getActivity().getApplicationContext(),
                android.R.layout.simple_list_item_1,
                array);

        listView.setAdapter(arrayAdapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                switch (position){
                    case 0:
                        //вызывается второй fragment с webview
                        break;
                    case 1:
                        //вызывается второй fragment с webview
                        break;
                }
            }
        });
    }

    @Override
    public void onResume() {
        super.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onStop() {
        super.onStop();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onDetach() {
        super.onDetach();
    }
}

layout FragmentList

<?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">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical"/>
</LinearLayout>