Android 在ListFragment中未使用前一个close（）完成游标

我在关闭应用程序或只打开应用程序让手机睡眠后收到此错误消息

当我让手机休眠时，我会收到30到61条此错误消息的日志条目。在加载ListFragment之前，会记录该错误。我怀疑片段已加载，但在片段的信息条目之前记录了错误

当我关闭应用程序时，我只会在onLoaderReset调用之后记录一个错误条目。我在应用程序关闭之前关闭数据库，这似乎有帮助

该应用程序运行正常，但我担心一旦在各种手机上运行，它就会失败

除了onLoaderReset中的adapter.swapCursornull之外，我没有显式控制光标

对于如何解决这个错误，我非常感激

谢谢

public class ChildList extends ListFragment implements
    LoaderManager.LoaderCallbacks<Cursor>, DatabaseConstants, GoodiList {

private final String TAG = "ChildList";

// database columns that we will retreive
final String[] PROJECTION = new String[] { CHILD_ID_COLUMN,
        CHILD_NAME_COLUMN };

// selects all
final String SELECTION = null;

SimpleCursorAdapter adapter = null;

private ListParent parentActivity;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Log.e(TAG, "on Create");
    String[] fromColumns = { CHILD_NAME_COLUMN, CHILD_ID_COLUMN };

    int[] toViews = { R.id.name_column, R.id.id_column };

    adapter=new SimpleCursorAdapter(
            getActivity(),
            R.layout.child_list_entry,
            null,
            fromColumns,
            toViews,
            0
            );

    setListAdapter(adapter);

    getLoaderManager().initLoader(0, null, this);

    Log.i(TAG, "finished on Create");
}


public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    LongClickListener longClickListener = new LongClickListener();

    getListView().setOnItemLongClickListener(longClickListener);
}

@Override
public void setListAdapter(ListAdapter adapter) {
    super.setListAdapter(adapter);
}

@Override
public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {

    Log.v(TAG, "starting on create loader");

    Uri CHILD_URI = ChildContentProvider.CONTENT_URI;

    CursorLoader cursorLoader = new CursorLoader(getActivity(), CHILD_URI,
            PROJECTION, SELECTION, null, null);

    Log.v(TAG, "finished on create loader");

    return cursorLoader;
}

@Override
public void onLoadFinished(Loader<Cursor> arg0, Cursor newCursor) {
    adapter.swapCursor(newCursor);

    if (newCursor != null) {
        int rowCount = newCursor.getCount();

        Log.v(TAG, "--- onLoadFinished:  got " + rowCount + " children");
    }
}

/**
 * this used to delete. However, we need it to select usually. Now delete is
 * done by long click.
 */
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);

    // delete child - remove child from list and database
    Object item = l.getItemAtPosition(position);

    Cursor cursor = (Cursor) item;

    int nameCol = cursor.getColumnIndex(CHILD_NAME_COLUMN);
    int idCol = cursor.getColumnIndex(CHILD_ID_COLUMN);

    final String name = cursor.getString(nameCol);

    final int childId = cursor.getInt(idCol);

    Log.i(TAG, "selected " + name + " id: " + childId + " at position "
            + position);

    cursor.close();

    parentActivity.listItemSelected(this, position, childId);

}

/**
 * Forces cursor to requery database and list to be update. Used when a new
 * child is entered in parent activity's EditText field.
 */
public void notifyDataChanged() {

    Log.i(TAG, "told adapter that data changed");

    getLoaderManager().restartLoader(0, null, this);

    adapter.notifyDataSetChanged();
}

/** tell adapter that cursor is no longer valid*/
@Override
public void onLoaderReset(Loader<Cursor> arg0) {
Log.i(TAG,"---- onLoaderReset -----");

adapter.swapCursor(null);

}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);

    parentActivity = (ListParent) activity;

    parentActivity.setList(this);

}

---

我也有同样的问题，我通过仔细查看文档解决了这个问题

根据文件,

方法SWAPCURSOR data返回原始未关闭的游标。如果新游标与旧游标相同，或者没有旧游标，则返回null

通过将我的代码从

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    adapter.swapCursor(data);
}

到

我阻止这些警告出现

注意：对于onLoaderReset方法也应该这样做。因为即使在执行adapter.swapCursornull时，它也会返回旧光标。

您应该使用changeCursorCursor光标而不是Swapcursor光标

---

如果您查看，您将看到它也会关闭旧光标。

这不是错误消息，而是警告消息。。。！！虽然应该有办法避免它。@brooklyn的杰夫你找到答案了吗？我现在正在努力解决同样的问题。我已经通过小心地关闭光标基本上消除了它。正如Igotsar所指出的，这是一个警告，因此不会使我的代码崩溃。

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    Cursor cursor = adapter.swapCursor(data);
    if (cursor != null) {
        cursor.close();
    }
}