position - 如何使用 CursorAdapter 按值设置 Spinner 选择

Question

我有一个从数据库中填充的微调器。我想选择默认情况下从列表中选择的项目。我需要找出列表 (CursorAdapter) 中的哪个项目具有值“Default Away”并将其设置为所选值。

    Spinner away_team_spinner = (Spinner)findViewById(R.id.away_team_spinner);
    DatabaseHelper db = new DatabaseHelper(this);
    Cursor team_list = db.getTeams(p_game_level);
    startManagingCursor(team_list);

    String[] team_name = new String[]{colTeamName};
    int[] to = new int[]{android.R.id.text1};
    SimpleCursorAdapter adapter =
      new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, team_list, team_name, to );
    adapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
    away_team_spinner.setAdapter(adapter);

    //// HERE IS WHERE MY ERRORS START ////

    Log.i("NEW_GAME","Before set arrayadapter");
    CursorAdapter adapter_choose = (CursorAdapter)away_team_spinner.getAdapter();
    Log.i("NEW_GAME","Before set setSelection");
    away_team_spinner.setSelection(adapter_choose.getPosition("Default Away"));

这是我通过搜索该网站找到的“解决方案”。但是，我不能将“getPosition”与 CursorAdapter 对象一起使用。我尝试了 ArrayAdapter，但随后“设置 arrayadapter 之前”之后的行注释错误为“android.widget.SimpleCursorAdapter 无法转换为 android.widget.ArrayAdapter”。我究竟做错了什么？谢谢。

Answer 1

您是否考虑过运行 for 循环直到找到位置，然后以这种方式设置适配器位置？我起草了一些代码然后测试它，我正在做类似的事情

好吧，这就成功了，尽情享受吧!

    int cpos = 0;

    for(int i = 0; i < simpleCursorAdapter.getCount(); i++){
      cursor.moveToPosition(i);
      String temp = cursor.getString((your column index, an int));
      if ( temp.contentEquals(yourString)){
        Log.d("TAG", "Found match");
        cpos = i;
        break;
      }
    }
    spinner.setSelection(cpos);