java - 为什么我在 RemoteViewsFactory 中收到 IndexOutOfBoundsException？

Question

我创建了一个带有 ListView 的应用程序小部件。在 RemoteViewsFactory 类中，我从 SQLite 数据库填充列表。一切都很好，但是如果我在 updateWidget() 方法中放入一个字符串，那么我会在 RemoteViewsFactory 的 getViewAt 方法中得到 IndexOutOfBoundsException。

它没有逻辑为什么会导致异常。因为在 updateWidget() 方法中我只将文本设置为一个远程 View 。

这里是导致问题的代码列表和字符串:

static void updateAppWidget(Context context, AppWidgetManager appWidgetManager, int appWidgetId)
{
    SharedPreferences sPreferences = context.getSharedPreferences("WidgetSettings_"+appWidgetId,0);
    RemoteViews rv = new RemoteViews(context.getPackageName(), R.layout.initial_layout);
    DBHelper dbHelper = DBHelper.getInstance(context);

    // To avoid Exception in a RemoteViewsFactory.getViewAt() method just comment or delete this line
    rv.setTextViewText(R.id.textViewListTotal, "Total sum of items"); // this line cause an Exception. If I commenting it then all is OK


    final Intent intent = new Intent(context, WidgetRemoteViewsService.class);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));
    rv.setRemoteAdapter(appWidgetId, R.id.items_list, intent);

    rv.setEmptyView(R.id.items_list, R.id.empty_view);

    final Intent actionIntent = new Intent(context, WidgetProvider.class);
    actionIntent.setAction(WidgetProvider.ACTION_MANAGE);
    actionIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    actionIntent.setData(Uri.parse(actionIntent.toUri(Intent.URI_INTENT_SCHEME)));
    PendingIntent actionPendingIntent = PendingIntent.getBroadcast(context, 0, actionIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    rv.setPendingIntentTemplate(R.id.items_list, actionPendingIntent);

    appWidgetManager.updateAppWidget(appWidgetId, rv);
    appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetId, R.id.items_list);
}

Answer 1

我使用已知的解决方案完成了此操作。在 getViewAt 方法中，我粘贴了如下检查语句:

@Override
public RemoteViews getViewAt(int position) {

    RemoteViews rv = new RemoteViews(context.getPackageName(), R.layout.list_item);

    try {
        if(ListItems.size() > 0) //<------- avoid indexoutofbound exception
        {
           // doing something with a remoteviews 
        }
    }
    catch (IndexOutOfBoundsException e)
    {
        e.printStackTrace();
    }

    return rv;
}