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我试图将抽屉布局(从android教程)添加到"hello world"Google Maps App.问题是您无法单击滑动菜单上的项目.我认为xml中的片段部分存在问题.我试图找到一种解决方法但没有效果.任何想法如何以不同的方式添加它以使其工作？

这是活动代码:

public class MainActivity extends FragmentActivity {
private GoogleMap mMap;
private SupportMapFragment fragment;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mPlanetTitles;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_ACTION_BAR);
    setContentView(R.layout.activity_main);
    setUpMapIfNeeded();
    mTitle = mDrawerTitle = getTitle();
    mPlanetTitles = getResources().getStringArray(R.array.menu_item);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);

    // set a custom shadow that overlays the main content when the drawer opens
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
    mDrawerList.setAdapter(new ArrayAdapter<String>(this,
            R.layout.draw_item, …