Fragment为什么不加载ListView,请问咋回事,

public class HomeFragment extends Fragment {

	private Context context;
	private View convertView;
	private GridView gridview;
	private ListView listView;
	private HomeListAdapter homeListAdapter;
	private HomeFourGridsAdapter fourGridsAdapter;
	private ViewPager viewPager;
	private int currentItem;
	private int[] imageResId;
	private ScheduledExecutorService scheduledExecutorService;
	private List<ImageView> imageViews;
	private String[] titles;
	private List<View> dots;
	protected final static int INIT_NEWS_IMGS = 101;
	protected final static int INIT_NEWS_LIST = 102;
	protected final static int INIT_NEWS_BTNS = 103;
	private TextView tv_title;

	public HomeFragment() {
	}

	public HomeFragment(Context context) {
		this.context = context;
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 设置Fragment不重建
		setRetainInstance(true);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		currentItem = 0;
		convertView = inflater.inflate(R.layout.fragment_home, null);

		initNewsList();
		initImgBtns();
		initNewsViewPage();
		return convertView;
	}

	@Override
	public void onStart() {
		scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
		scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 3, 3,
				TimeUnit.SECONDS);
		super.onStart();
	}

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

	// 初始化滑动图片
	private void initNewsViewPage() {

		imageResId = new int[] { R.drawable.gallery_photo_1,
				R.drawable.gallery_photo_3, R.drawable.gallery_photo_4,
				R.drawable.gallery_photo_8, R.drawable.gallery_photo_3 };
		titles = new String[imageResId.length];
		titles[0] = "11111";
		titles[1] = "22222";
		titles[2] = "33333";
		titles[3] = "44444";
		titles[4] = "55555";

		imageViews = new ArrayList<ImageView>();

		for (int i = 0; i < imageResId.length; i++) {
			ImageView imageView = new ImageView(this.context);
			imageView.setImageResource(imageResId[i]);
			imageView.setScaleType(ScaleType.CENTER_CROP);
			imageViews.add(imageView);
		}

		dots = new ArrayList<View>();
		dots.add(convertView.findViewById(R.id.v_dot0));
		dots.add(convertView.findViewById(R.id.v_dot1));
		dots.add(convertView.findViewById(R.id.v_dot2));
		dots.add(convertView.findViewById(R.id.v_dot3));
		dots.add(convertView.findViewById(R.id.v_dot4));

		tv_title = (TextView) convertView.findViewById(R.id.tv_title);
		tv_title.setText(titles[0]);

		viewPager = (ViewPager) convertView.findViewById(R.id.vp);
		viewPager.setAdapter(new HomeNewsViewPaperAdapter(imageResId,
				imageViews));

		viewPager.setOnPageChangeListener(new NewsViewPageChangeListener());
	}

	// 初始化新闻列表
	private void initNewsList() {
		listView = (ListView) convertView.findViewById(R.id.home_news_listview);
		homeListAdapter = new HomeListAdapter(this.context, new int[] {
				drawable.app_logo, drawable.app_logo }, new String[] { "1111",
				"1111" }, new String[] { "2222", "2222" });

		Message message = handler.obtainMessage();
		message.what = this.INIT_NEWS_LIST;
		handler2.handleMessage(message);
	}

	// 初始化首页的四个按钮
	private void initImgBtns() {
		gridview = (GridView) convertView.findViewById(R.id.home_grilView);
		fourGridsAdapter = new HomeFourGridsAdapter(this.context, new int[] {
				drawable.app_logo, drawable.app_logo, drawable.app_logo,
				drawable.app_logo });

		Message message = handler.obtainMessage();
		message.what = this.INIT_NEWS_BTNS;
		handler2.handleMessage(message);
	}

	private Handler handler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			viewPager.setCurrentItem(currentItem);
		};
	};

	private Handler handler2 = new Handler() {
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case HomeFragment.INIT_NEWS_LIST:
				listView.setAdapter(homeListAdapter);
				homeListAdapter.notifyDataSetChanged();
				break;
			case HomeFragment.INIT_NEWS_BTNS:
				gridview.setAdapter(fourGridsAdapter);
				fourGridsAdapter.notifyDataSetChanged();
				break;
			}
		};