如何覆盖的CursorAdapter bindView [英] How to override CursorAdapter bindView

问题描述

我想从显示在光标信息的ListView ，每行包含一个的ImageView 和的TextView 。我有一个 CustomCursorAdapter 延长的CursorAdapter 在 bindView 我评估从游标中的数据，并基于该设置的意见，图片和文字。

当我运行应用程序的的ListView 里显示正确的行数量，但都是空的。我知道重写bindView当我错过了一些东西，但我不知道是什么。

任何帮助将大大AP preciated。

 私有类CustomCursorAdapter扩展的CursorAdapter {  公共CustomCursorAdapter（）{
    超（Lmw.this，monitorsCursor）;
  }  @覆盖
  公共查看NewView的（上下文的背景下，光标光标的ViewGroup父）{
    LayoutInflater layoutInflater = getLayoutInflater（）;    返回layoutInflater.inflate（R.layout.row，NULL）;
  }  @覆盖
  公共无效bindView（查看视图，上下文的背景下，光标光标）{
    尝试{
      INT monitorNameIndex = cursor.getColumnIndexOrThrow（DbAdapter.MONITORS_COLUMN_MONITOR_NAME）;
      INT resultTotalResponseTimeIndex = cursor.getColumnIndexOrThrow（DbAdapter.RESULTS_COLUMN_TOTAL_RESPONSE_TIME）;      字符串monitorName = cursor.getString（monitorNameIndex）;
      INT warningThreshold = cursor.getInt（resultTotalResponseTimeIndex）;      字符串LBL = monitorName +\\ n+ Integer.toString（warningThreshold）+毫秒;      TextView的标签=（TextView中）view.findViewById（R.id.label）;
      label.setText（LBL）;      ImageView的图标=（ImageView的）view.findViewById（R.id.icon）;
      如果（warningThreshold＆LT; 1000）{
        icon.setImageResource（R.drawable.ok）;
      }其他{
        icon.setImageResource（R.drawable.alarm）;
      }
    }赶上（抛出：IllegalArgumentException五）{
      // TODO：处理异常
    }
  }
}
 

解决方案

的 bindView（）方法似乎确定。

尝试更换您的 NewView的（）的方法：

  @覆盖
公共查看NewView的（上下文的背景下，光标光标的ViewGroup父）{
    返回mInflater.inflate（R.layout.row，父母，假）;
}
 

和，由于性能原因：

• 将 getLayoutInflater（）在
  构造


• 所有的 cursor.getColumnIndexOrThrow（）调用同样的事情，
  为 ened 已在结果说
  注释


• 使用StringBuilder创建您的 LBL 的文本


• 有没有必要做的 Integer.toString（warningThreshold）的...
  只是使用的 warningThreshold 的

后来修改：
唯一的区别你的膨胀（）方法，我建议之一是，这一个创建符合母公司的布局PARAMS。

I'm trying to display information from a Cursor in a ListView, each row contains a ImageView and a TextView. I have a CustomCursorAdapter extending CursorAdapter, in bindView I evaluate the data from the cursor and based on that set the views image and text.

When I run the app the ListView displayes the correct amount of rows, but they are empty. I know I have missed something when overriding bindView, but I'm not sure what.

Any help would be greatly appreciated.

private class CustomCursorAdapter extends CursorAdapter {

  public CustomCursorAdapter() {
    super(Lmw.this, monitorsCursor);
  }

  @Override
  public View newView(Context context, Cursor cursor, ViewGroup parent) {
    LayoutInflater layoutInflater = getLayoutInflater();

    return layoutInflater.inflate(R.layout.row, null);
  }

  @Override
  public void bindView(View view, Context context, Cursor cursor) {
    try {
      int monitorNameIndex = cursor.getColumnIndexOrThrow(DbAdapter.MONITORS_COLUMN_MONITOR_NAME);
      int resultTotalResponseTimeIndex = cursor.getColumnIndexOrThrow(DbAdapter.RESULTS_COLUMN_TOTAL_RESPONSE_TIME);

      String monitorName = cursor.getString(monitorNameIndex);
      int warningThreshold = cursor.getInt(resultTotalResponseTimeIndex);

      String lbl = monitorName + "\n" + Integer.toString(warningThreshold) + " ms";

      TextView label = (TextView) view.findViewById(R.id.label);     
      label.setText(lbl);

      ImageView icon = (ImageView)view.findViewById(R.id.icon);
      if(warningThreshold < 1000) {
        icon.setImageResource(R.drawable.ok);      
      } else {
        icon.setImageResource(R.drawable.alarm);
      }


    } catch (IllegalArgumentException e) {
      // TODO: handle exception
    }
  }
}

解决方案

The bindView() method seems ok.

Try replacing your newView() method:

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    return mInflater.inflate(R.layout.row, parent, false);
}

And, for performance reasons:

• move getLayoutInflater() in the constructor
• same thing with all the cursor.getColumnIndexOrThrow() calls, as ened already said in the
  comments
• use a StringBuilder for creating your lbl text
• there's no need to do Integer.toString(warningThreshold)... just use warningThreshold

Later edit: The only difference between your inflate() method and the one I suggested is that this one creates layout params that match the parent.

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