我有一个包含3个标签的应用。在Tab1中我有一个带有光标适配器的列表视图，在Tab2和Tab3中我只有一些Textview。
当我使用代码过滤listview时会出现问题，接下来，我会在标签中随机点击。当我用Listview回到Tab1时，我得到了错误。
我跟踪问题，它位于setFilterQueryProvider。如果我摆脱过滤器一切正常。我做错了什么？
错误是：
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.techabout.medappointment, PID: 10716
android.database.StaleDataException: Attempting to access a closed CursorWindow.Most probable cause: cursor is deactivated prior to calling this method.
at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:139)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
at android.database.CursorWrapper.getString(CursorWrapper.java:137)
at net.techabout.medappointment.AgendaCursorAdapter.bindView(AgendaCursorAdapter.java:86)
at android.support.v4.widget.CursorAdapter.getView(CursorAdapter.java:261)
at android.widget.AbsListView.obtainView(AbsListView.java:2346)
适配器类中发生错误：
public void bindView(View view, Context context, final Cursor cursor) {
ViewHolder viewHolder = (ViewHolder) view.getTag();
String temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_INDICE)); //**Error here**
我的片段是：
public class AgendaMedFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {
private static final String TAG = AgendaMedFragment.class.getSimpleName();
// These variables will hold the date values later
AgendaCursorAdapter adapter;
ListView listView;
private int mPosition = ListView.INVALID_POSITION;
private static final String SELECTED_KEY = "selected_position";
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.agendamedfrag, null);
listView = (ListView) view.findViewById(R.id.list_cons);
View v = (View) view.findViewById(R.id.empty_cons);
listView.setEmptyView(v);
adapter = new AgendaCursorAdapter(getActivity(), null,0);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
mPosition = position;
}
});
if (savedInstanceState != null && savedInstanceState.containsKey(SELECTED_KEY)) {
mPosition = savedInstanceState.getInt(SELECTED_KEY);
}
EditText myFilter = (EditText) view.findViewById(R.id.myFilter);
myFilter.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
adapter.getFilter().filter(s.toString());
}
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
}
public void onTextChanged(CharSequence s, int start,
int before, int count) {
adapter.getFilter().filter(s.toString());
}
});
adapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
Cursor cursor = getFilteredNames(constraint != null ? constraint.toString() : null);
return cursor;
}
});
return view;
}
public Cursor getFilteredNames (CharSequence constraint) {
SQLiteDatabase mDB = DataProvider.getDB();
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setTables(
DataProvider.TABLE_AGENDA
);
String asColumnsToReturn[] = {"*"};
if (constraint == null || constraint.length () == 0) {
// Return the full list
return queryBuilder.query(mDB, asColumnsToReturn, null, null,
null, null, DataProvider.COL_ID + " DESC");
} else {
String value = "%"+constraint.toString()+"%";
return mDB.query(DataProvider.TABLE_AGENDA, asColumnsToReturn, "nome_cliente like ? ", new String[]{value}, null, null, null);
}
}
@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
CursorLoader loader = new CursorLoader(getActivity(),
DataProvider.CONTENT_URI_AGENDA,
null,
null,
null,
DataProvider.COL_ID + " DESC");
return loader;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (getLoaderManager().getLoader(0)==null) {
getLoaderManager().initLoader(0, null, this);
}
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
adapter.swapCursor(null);
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
adapter.swapCursor(data);
if (mPosition != ListView.INVALID_POSITION) {
listView.smoothScrollToPosition(mPosition);
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
if (mPosition != ListView.INVALID_POSITION) {
outState.putInt(SELECTED_KEY, mPosition);
}
super.onSaveInstanceState(outState);
}
}
我的适配器是：
public class AgendaCursorAdapter extends CursorAdapter {
public static class ViewHolder {
public final Button butDesmarcar;
public final Button butVermapa;
public final TextView mProtocolo;
public final TextView mNomeCliente;
public final TextView mNomeHosp;
public final TextView mNomeMed;
public final TextView mNomeConv;
public final TextView mNomePlano;
public final TextView mDatamarcada;
public final TextView mHoraMarcada;
public ViewHolder(View view) {
butDesmarcar = (Button) view.findViewById(R.id.butdesmarcar);
butVermapa = (Button) view.findViewById(R.id.but_ender_hosp_cons);
mProtocolo = (TextView) view.findViewById(R.id.tvindice);
mNomeCliente = (TextView) view.findViewById(R.id.tvnomecliente);
mNomeHosp = (TextView) view.findViewById(R.id.tvnomehosp);
mNomeMed = (TextView) view.findViewById(R.id.tvnomemed);
mNomeConv= (TextView) view.findViewById(R.id.tvnomeconv);
mNomePlano= (TextView) view.findViewById(R.id.tvnomeplan);
mDatamarcada= (TextView) view.findViewById(R.id.tvdatamarcada);
mHoraMarcada= (TextView) view.findViewById(R.id.tvhoramarcada);
}
}
public AgendaCursorAdapter(Context context, Cursor c, int flags) {
super(context, c, flags);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
int layoutId = R.layout.singlerowagenda;
View view = LayoutInflater.from(context).inflate(layoutId, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
view.setTag(viewHolder);
return view;
}
@Override
public void bindView(View view, Context context, final Cursor cursor) {
ViewHolder viewHolder = (ViewHolder) view.getTag();
String temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_INDICE));
viewHolder.mProtocolo.setText(temp);
temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_NOME_CLIENTE));
viewHolder.mNomeCliente.setText(temp);
temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_NOME_HOSP));
viewHolder.mNomeHosp.setText(temp);
temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_NOME_MED));
viewHolder.mNomeMed.setText(temp);
temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_NOME_CONV));
viewHolder.mNomeConv.setText(temp);
temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_NOME_PLANO));
viewHolder.mNomePlano.setText(temp);
temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_DATA_MARCADA));
viewHolder.mDatamarcada.setText(temp);
temp = cursor.getString(cursor.getColumnIndexOrThrow(DataProvider.COL_AG_HORA_MARCADA));
viewHolder.mHoraMarcada.setText(temp);
}
}