ArrayAdapter - 我做错了什么?

时间:2011-10-19 18:18:47

标签: android

我有一个ListActivity,我正在尝试使用自定义ArrayAdapter绑定到业务对象数组。

当我在模拟器或真实的Android设备上运行应用程序时,我在ArrayAdapter的“holder.txtTeam1.setText(info.Team1);”行中得到一个空引用。在进行一些调试之后,看起来调用膨胀布局实际上并没有创建子TextView,它只创建了outter TableLayout。

这完全基于我在互联网上找到的一个教程,而且我已经在桌面上敲了近一个星期。谁能告诉我我做错了什么?

活动如下:

    public class BaseballPressActivity extends ListActivity {

    private GameDataAdapter adapter;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        adapter = new GameDataAdapter(this, new GameData[]{new GameData("3:10pm","Team 1","Team 2")});
        this.setListAdapter(adapter);
        }
    }

ArrayAdapter如下所示:

public class GameDataAdapter extends ArrayAdapter<GameData> {

Context context;
GameData data[] = null;

public GameDataAdapter(Context context, GameData[] data) {
    super(context,R.layout.listitem_game, R.id.Name1, data);

    this.context = context;
    this.data = data;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    GameViewHolder holder = null;

    if(row == null)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();
        row = inflater.inflate(R.layout.test , parent, false);

        holder = new GameViewHolder();
        holder.txtTeam1 = (TextView)row.findViewById(R.id.Name1);

        row.setTag(holder);
    }
    else
    {
        holder = (GameViewHolder)row.getTag();
    }

    GameData info = data[position];
    holder.txtTeam1.setText(info.Team1);

    return row;
}

static class GameViewHolder
{
    TextView txtTeam1;
    TextView txtTeam2;
    TextView txtGameTime;
}

}

列表活动项目的布局如下所示:

    <?xml version="1.0" encoding="utf-8"?>
<TableLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
    <TableRow android:id="@+id/tableRow1" android:layout_width="wrap_content" android:layout_height="wrap_content">
        <TextView android:text="TextView" android:layout_weight="0" android:id="@+id/textView1" android:layout_height="wrap_content" android:layout_width="0dp"></TextView>
        <ImageView android:id="@+id/imageView1" android:src="@drawable/icon" android:layout_height="wrap_content" android:layout_weight="0" android:layout_width="0dp"></ImageView>
        <LinearLayout android:id="@+id/linearLayout1" android:orientation="vertical" android:layout_height="wrap_content" android:layout_weight="1" android:layout_width="0dp">
            <TextView android:text="TextView" android:id="@+id/Name1" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
            <TextView android:text="TextView" android:id="@+id/Name2" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
        </LinearLayout>
        <ImageView android:id="@+id/imageView2" android:src="@drawable/icon" android:layout_height="wrap_content" android:layout_weight="0" android:layout_width="0dp"></ImageView>
    </TableRow>
    </TableLayout>

2 个答案:

答案 0 :(得分:2)

好吧,我认为问题出在这里

 row = inflater.inflate(R.layout.test , parent, false);

将false更改为true,我认为您必须将视图附加到它的父级。

如果不起作用,试试这个。

 row = inflater.inflate(R.layout.test , null);

答案 1 :(得分:1)

放弃SimpleAdapterSimpleCursorAdapter的ArrayLayout。这将允许您轻松地将数据绑定到简单到相当复杂的布局。