如何在导航栏中添加下拉列表？

Question

我已经在这个网站上查看过多个问题及其答案，但这些导航抽屉似乎都不像我做的那样。

public class Main extends Activity  {

    // Navigation Drawer variables
    private String[] navMenu = new String[] { "Home", "Menu", "Settings" };
    private DrawerLayout navDrawer;
    private ListView navList;
    private ArrayAdapter<String> navAdapter;

    // Fragments
    private Home fHome = new Home();
    private Menu fMenu = new Menu();
    private Settings fSettings = new Settings();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        navigationDrawer();// Navigation Drawer setup


    }

    private void navigationDrawer() {
        navDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        navList = (ListView) findViewById(R.id.left_drawer);
        navAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1, navMenu);
        navList.setBackgroundColor(Color.parseColor("#1c2d4b"));
        navList.setAdapter(navAdapter);
        navList.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {
                navDrawer.closeDrawers();
                //TODO Switch current fragment
                //navMenu[position]
            }

        });
    }

}

activity_main.xml中

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ListView
        android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp" />

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

上面是我的Main和它的xml布局，如何在Menu下拉列表中创建navMenu项？我使用导航抽屉相当新，所以尽管它运行良好，但我不确定我是否以正确的方式完成了它。