Question

我在Android上遇到Appwidget问题。我有一个listView和一个Button，Widget的更新周期设置为30分钟。现在我想在单击按钮时更新listView。我在互联网上搜索过这个问题，但我还没有找到解决问题的答案。在我的代码中，我需要在onReceived（）方法中编写什么来更新小部件？

我的代码：

public class WidgetProvider extends AppWidgetProvider {

private static final String ACTION_UPDATE_CLICK = "click";

private Date date;

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
        int[] appWidgetIds) {
    final int N = appWidgetIds.length;

    for (int i = 0; i < N; ++i) {
        RemoteViews remoteViews = updateWidgetListView(context,
                appWidgetIds[i]);

        appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
        remoteViews.setOnClickPendingIntent(R.id.bMorgenWidget,
                getPendingSelfIntent(context,
                        ACTION_UPDATE_CLICK));
    }

    super.onUpdate(context, appWidgetManager, appWidgetIds);
}


private PendingIntent getPendingSelfIntent(Context context, String action) {
    Intent intent = new Intent(context, getClass());
    intent.setAction(action);
    return PendingIntent.getBroadcast(context, 0, intent, 0);
}

@Override
public void onReceive(Context context, Intent intent) {
    super.onReceive(context, intent);

    if (ACTION_UPDATE_CLICK.equals(intent.getAction())) {

    }
}

private RemoteViews updateWidgetListView(Context context, int appWidgetId) {

    RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
            R.layout.widget_layout);

    Intent svcIntent = new Intent(context, WidgetService.class);
    svcIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    svcIntent.setData(Uri.parse(svcIntent.toUri(Intent.URI_INTENT_SCHEME)));
    remoteViews.setRemoteAdapter(appWidgetId, R.id.listViewWidget,
            svcIntent);
    remoteViews.setEmptyView(R.id.listViewWidget, R.id.empty_view);
    return remoteViews;
}
}

Answer 1

我遇到了同样的问题。我想知道如何强制更新我的小部件中的数据和ui。

我发现的解决方案是使用公共静态内部服务：

/**
 * Update Big Widget Service
 */
public static class WidgetBigUpdateService extends Service
{
    public WidgetBigUpdateService()
    {
        super();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        Context context = getBaseContext();
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
        int[] appWidgetIds = appWidgetManager.getAppWidgetIds(new ComponentName(context, this.getClass()));
        RemoteViews bigWidgetView = new RemoteViews(context.getPackageName(), R.layout.widget_big_layout);
        refreshBigWidgetData(context, appWidgetManager, appWidgetIds, bigWidgetView);
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent)
    {
        return null;
    }
}

方法 refreshBigWidgetData(context, appWidgetManager, appWidgetIds, bigWidgetView); 属于小部件，负责我的小部件的UI更新：

/**
 * Asks for Big Widget Updates
 *
 * @param context
 */
private void widgetBigForceUpdate(Context context)
{
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    int[] appWidgetIds = appWidgetManager.getAppWidgetIds(new ComponentName(context, this.getClass()));
    onUpdate(context, appWidgetManager, appWidgetIds);
}

正如您所看到的，它使用上下文，appWidgetManager和appWidgetId调用函数onUpdate()。此代码100％正常运行，我毫不怀疑您可以根据具体用途进行调整。

希望这有帮助

Android AppWidget更新ListView

1 个答案: