Question

我有一个包含6个片段的Fragment活动。每个片段都是同一个类的实例（TalkListFragment - 它扩展了ListFragment）。现在，在单击项目的第一页中，将触发该事件。只要刷了另一个页面，然后单击该项目就不会发生任何事情。我在XML文件中也完成了listView.setDescendantFocusability(ListView.FOCUS_BLOCK_DESCENDANTS);和相同的操作。

这是代码

    public class TalkFragmentListActivity extends FragmentActivity implements OnClickListener, OnPageChangeListener
{
    private SwipePagerAdapter pageAdapter = null;
    private ViewPager viewPager = null;
        .
        .
            private void initializePaging()
    {
        foodFragment = new TalkListFragment();
        foodFragment.setTitle("Food");
        foodFragment.setUrl("");
        shoppingFragment = new TalkListFragment();
        shoppingFragment.setTitle("Shopping");
        shoppingFragment.setUrl("");
        eventsFragment = new TalkListFragment();
        eventsFragment.setTitle("Events");
        eventsFragment.setUrl("");
        nightlifeFragment = new TalkListFragment();
        nightlifeFragment.setTitle("Night Life");
        nightlifeFragment.setUrl("");
        serviceFragment = new TalkListFragment();
        serviceFragment.setTitle("Service");
        serviceFragment.setUrl("");
        conceirgeFragment = new TalkListFragment();
        conceirgeFragment.setTitle("Conceirge");
        conceirgeFragment.setUrl("");

        pageAdapter = new SwipePagerAdapter(getSupportFragmentManager());
        pageAdapter.addFragment(foodFragment);
        pageAdapter.addFragment(shoppingFragment);
        pageAdapter.addFragment(eventsFragment);
        pageAdapter.addFragment(nightlifeFragment);
        pageAdapter.addFragment(serviceFragment);
        pageAdapter.addFragment(conceirgeFragment);

        viewPager = (ViewPager) super.findViewById(R.id.talk_list_pager);

        viewPager.setAdapter(this.pageAdapter);
        viewPager.setOffscreenPageLimit(2);
        viewPager.setCurrentItem(0);

        viewPager.setOnPageChangeListener(this);
    }

这是TalkListClass：

    public class TalkListFragment extends ListFragment implements OnClickListener, OnItemClickListener
    {
        private TalkListAdapter adapter = null;
        private ListView listView = null;
            .
            .
                @Override
            public void onActivityCreated(Bundle savedInstanceState)
            {
                super.onActivityCreated(savedInstanceState);

                TalkFragmentListActivity activity = (TalkFragmentListActivity) getActivity();
                adapter = new TalkListAdapter(activity, R.layout.talks_fragment_item, getTalkList());
                listView = (ListView) activity.findViewById(android.R.id.list);
        //      listView = (ListView) activity.findViewById(R.id.talk_items_listview);
                setListAdapter(adapter);
                listView.setOnItemClickListener(this);
                listView.setDescendantFocusability(ListView.FOCUS_BLOCK_DESCENDANTS);
.............
}


    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id)
    {
        if (listView != null)
        {
            TalkListAdapter adptr = (TalkListAdapter) parent.getAdapter();
            Talk talk = (Talk) adptr.getItem(position);
            Intent i = new Intent(view.getContext(), TalkDetailActivity.class);
            i.putExtra("talk", talk);
            this.startActivity(i);
        }
    }

现在程序在第一页上表现良好，但是当刷页时，ItemOnClick永远不会起作用。在ItemClickListener上有很多问题，但是我找不到这个特定问题的解决方案。

谢谢。

Answer 1

替换行：

listView = (ListView) activity.findViewById(android.R.id.list);

使用：

listView = getListView();

使用第一行代码，您在父活动中搜索当前片段的ListView。这适用于第一个片段，因为在初始时刻，第一个片段的ListView被正确找到并在您的监听器中使用。当您滑动到第二个片段并再次搜索父活动中的ListView时，您将“找到”前一个片段的ListView（它不在屏幕上，但仍然存在于{ {1}}以获得更好的表现）。您在ViewPager这个不可见的ListView上设置OnItemClickListener，但实际上您会点击您在可见片段中看到的另一个ListView（并且没有听众）。使用getListView()，您将始终对片段的ListView有正确的引用。另外a ListFragment has its own callback for ListView item clicks我建议使用它而不是自己设置监听器。

Android：在页面被翻转时未触发OnItemClickListener事件（FragmentActivity和ListFragment）

1 个答案: