动态创建的ListFragment中的Listview不会出现

Question

我目前正在开发一个应用，该应用中我想使用带有多个动态创建的片段的底部导航。

因此，我设置了一个测试应用程序来习惯这些功能。

现在的问题是，如果我通过静态XML创建ListFragment，则可以正确创建ListView，但是如果动态创建，则不会显示ListView，仅显示BottomNavigation，而没有其他显示。

主要活动：

public class MainActivity extends AppCompatActivity {

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

        addFragment();
    }

    private void addFragment() {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        MyListFragment myListFragment = new MyListFragment();

        fragmentTransaction.add(R.id.fragmentContainer, myListFragment);
        fragmentTransaction.commit();
    }
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/fragmentContainer"
        android:layout_margin="5dp"
        android:layout_alignTop="@+id/bottom_nav"/>

    <android.support.design.widget.BottomNavigationView
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:id="@+id/bottom_nav"
        app:menu="@menu/menu_bottom_nav"
        android:background="#808080"
        android:layout_alignParentBottom="true"/>
</RelativeLayout>

ListFragment：

public class MyListFragment extends ListFragment implements AdapterView.OnItemClickListener {

    CustomerAdapter customerAdapter;
    ListView listView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        Customer customer = new Customer("Testcustomer","123456", "654321");
        customerAdapter = new CustomerAdapter(Objects.requireNonNull(getActivity()),R.layout.list_pack_item);
        listView = new ListView(getActivity());
        listView.setAdapter(customerAdapter);
        customerAdapter.add(customer);
        listView.setOnItemClickListener(this);
        return listView;
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        //do stuff
    }
}

CustomerAdapter：

public class CustomerAdapter extends ArrayAdapter {

    List list = new ArrayList();
    public CustomerAdapter(@NonNull Context context, int resource ) {
        super(context, resource);
    }

    public void add( @Nullable Customer object ) {
        super.add(object);
        list.add(object);
    }

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

    @Nullable
    @Override
    public Object getItem(int position ) {
        return list.get(position);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent ) {

        View row;
        row = convertView;
        CustomerHolder customerHolder;
        if (row == null) {
            LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = layoutInflater.inflate(R.layout.list_pack_item, parent, false);
            customerHolder = new CustomerHolder();

            customerHolder.tx_name = row.findViewById(R.id.tx_name);
            customerHolder.tx_intern = row.findViewById(R.id.tx_intern);
            customerHolder.tx_extern = row.findViewById(R.id.tx_extern);
            row.setTag(customerHolder);
        } else {
            customerHolder = (CustomerHolder) row.getTag();
        }

        Customer customer = (Customer) this.getItem(position);
        customerHolder.tx_name.setText(customer.getName());
        customerHolder.tx_intern.setText("Internal Number: " + customer.getMyCustomerNumber());
        customerHolder.tx_extern.setText("Supplier Number: " + customer.getSupplierNumber());

        return row;
    }

    static class CustomerHolder {
        TextView tx_name, tx_intern, tx_extern;
    }
}

客户分类

public class Customer {

    private String name;
    private String supplierNumber;
    private String myCustomerNumber;

    public Customer(String name, String supplierNumber, String myCustomerNumber) {
        this.name = name;
        this.supplierNumber = supplierNumber;
        this.myCustomerNumber = myCustomerNumber;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSupplierNumber() {
        return supplierNumber;
    }

    public void setSupplierNumber(String supplierNumber) {
        this.supplierNumber = supplierNumber;
    }

    public String getMyCustomerNumber() {
        return myCustomerNumber;
    }

    public void setMyCustomerNumber(String myCustomerNumber) {
        this.myCustomerNumber = myCustomerNumber;
    }
}

如果需要任何其他信息或代码，请告诉我！

另外：我需要动态创建片段以替换它们，对吗？