我有一个包含6个片段的Fragment活动。每个片段都是同一类的实例(TalkListFragment-扩展了ListFragment)。现在,在第一页中,单击某个项目后便会触发该事件。一旦刷完另一页,然后单击该项目,则不会发生任何事情。我已经完成了listView.setDescendantFocusability(ListView.FOCUS_BLOCK_DESCENDANTS);
,并且在XML文件中也是如此。
这里是代码
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);
}
这里是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,该程序在第一页上的表现很好,但是当滑动页面时,ItemOnClick将永远无法运行。关于ItemClickListener的问题很多,但我找不到此特定问题的解决方案。
替换行:
listView = (ListView) activity.findViewById(android.R.id.list);
with:
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
已正确找到并在您的侦听器中使用。当您滑动到第二个片段并再次在父活动中搜索ListView
时,您将“找到”前一个片段的ListView
(不在屏幕上,但仍存在于ViewPager
中,以便更好性能)。正是在此不可见的ListView
上设置了OnItemClickListener
,但实际上您将单击一个不同的ListView
,即在可见片段中看到的那个getListView()
(没有侦听器)。通过使用ListView
,您将始终正确引用片段的a ListFragment
has its own callback for ListView
item clicks。另外,ListFragment
,我建议您使用它,而不要自己设置监听器。