多次接收告警意图

Question

我需要我的闹钟每天上午 11 点响起一次，并更新我所有的小部件。当我用一个小部件测试我的应用程序时，我的 onReceive() 方法会在时间一到就触发多次，每次都会更新我的小部件。为什么会这样？

这是我的代码：

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    theAppWidgetManager = appWidgetManager;
    // There may be multiple widgets active, so update all of them
    for (int appWidgetId : appWidgetIds) {
        ...
    }
    scheduleNextUpdate(context);
}

@Override
public void onReceive(Context context, Intent intent){
    if (intent.getAction().equals(ACTION_SCHEDULED_UPDATE)) {
        AppWidgetManager manager = AppWidgetManager.getInstance(context);
        int[] ids = manager.getAppWidgetIds(new ComponentName(context, AppWidget.class));
        onUpdate(context, manager, ids);
    }
    super.onReceive(context, intent);

}
private  void scheduleNextUpdate(Context context) {
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(context, AppWidget.class);
    intent.setAction(ACTION_SCHEDULED_UPDATE);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);

    // Get a calendar instance for midnight tomorrow.
    Calendar at11 = Calendar.getInstance();
    at11.set(Calendar.HOUR_OF_DAY, 11);
    at11.set(Calendar.MINUTE, 30);
    at11.set(Calendar.SECOND, 1);
    at11.set(Calendar.MILLISECOND, 0);
    at11.add(Calendar.DAY_OF_YEAR, 1);

    // For API 19 and later, set may fire the intent a little later to save battery,
    // setExact ensures the intent goes off exactly at midnight.
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
        alarmManager.set(AlarmManager.RTC_WAKEUP, at11.getTimeInMillis(), pendingIntent);
    } else {
        alarmManager.setExact(AlarmManager.RTC_WAKEUP, at11.getTimeInMillis(), pendingIntent);
    }
}

Answer 1

我认为这里的问题是您在 onUpdate 方法中安排下一次更新。此方法的说明说：

Called in response to the AppWidgetManager.ACTION_APPWIDGET_UPDATE and AppWidgetManager.ACTION_APPWIDGET_RESTORED broadcasts when this AppWidget provider is being asked to provide RemoteViews for a set of AppWidgets.

所以，理论上是可以触发多次的。我认为您应该在 onReceive 中安排下一次更新，或者以某种方式检查下一次更新的广播是否已经安排。