android - 调用 requery() 或 notifyDataSetChanged 时 ListView 不会刷新

Question

所以我在 listView 中显示了一个数据库。当我删除一个项目时，我试图让列表更新和删除该项目。我有所有代码并且没有收到任何错误。我只是不刷新列表。

这是我所拥有的：

public void Requery() {
    db.open();
    final Cursor c1 = DBAdapter.getAllRecords();
    startManagingCursor(c1);

    String[] from = new String[] { DBAdapter.KEY_ITEM };
    int[] to = new int[] { R.id.text1 };

    SimpleCursorAdapter notes = new SimpleCursorAdapter(this, R.layout.row,
            c1, from, to);
    setListAdapter(notes);
    c1.getCursor().requery(); //trying to refresh list
    db.close();
}

我也试过：

public void Requery() {
    db.open();
    final Cursor c1 = DBAdapter.getAllRecords();
    startManagingCursor(c1);

    String[] from = new String[] { DBAdapter.KEY_ITEM };
    int[] to = new int[] { R.id.text1 };

    SimpleCursorAdapter notes = new SimpleCursorAdapter(this, R.layout.row,
            c1, from, to);
    setListAdapter(notes);
    notes.notifyDataSetChanged(); //another way that still didn't work
    db.close();
}

我在这里错过了什么吗？