我在ListView片段中使用了加载程序,并且在按“后退”按钮时已重新创建它.你能告诉我如何处理这个senario吗？
这是我的ListView片段代码.在这里,我有一个布尔变量,在单击列表项时将其设置为true.但是一旦按下后退按钮,onCreateView将被调用,因此后退按钮将为false.
public class GTFragment extends SherlockFragment implements LoaderCallbacks<Cursor>{
ListView mTListview = null;
GoogleTasksAdapter mGTasksAdapter = null;
private sqliteCursorLoader mTLoader=null;
private LoaderManager mTLoaderManager;
private String mSelectedListID = null;
private boolean mIsBackbuttonispressed = false;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.task_home_activity, container, false);
if(!mIsBackbuttonispressed)
getLoaderManager().initLoader(0, null, this);
mTListview = (ListView) view.findViewById(R.id.id_task_list_home_activity);
mGTasksAdapter = new GoogleTasksAdapter(getActivity());
mTListview.setonItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> listview,
View clickedview, int position, long arg3) {
// Todo Auto-generated method stub
GoogleTaskItem item = new GoogleTaskItem();
Cursor coursor = ((GoogleTasksAdapter)listview.getAdapter()).getCursor();
if(coursor.movetoPosition(position))
{
mIsBackbuttonispressed = true;
GoogleTaskController.get_googletask_controllerObj()
.LaunchTaskPreviewActivity();
}
}
});
mTListview.setAdapter(mGTasksAdapter);
mIsBackbuttonispressed = false;
return view;
}
我的片段活动类代码
public class TLActivity extends SherlockFragmentActivity {
LeftSliderTaskListOptions mTaskOptionsFragment = null;
GoogleTasksFragment mTFragment = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().setdisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
setContentView(R.layout.layout_gt_list);
// FragmentTransaction tfragment = this.getSupportFragmentManager().beginTransaction();
mTFragment = new GTasksFragment();
t.replace(R.id.id_tfragment, mTFragment);
t.commit();
}
解决方法:
您有多种选择可解决此问题.
>像这样重写onSaveInstanceState：
@Override
public void onSaveInstanceState (Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean("mIsBackbuttonispressed", mIsBackbuttonispressed);
}
然后在onCreateView中,可以通过以下方式获取变量：
if (savedInstanceState != null)
mIsBackbuttonispressed = savedInstanceState.getBoolean("mIsBackbuttonispressed", false);
>您可以设置this.setRetainInstance(true);在片段的onCreate方法中.
