Android:使用AlarmManager设置所有PendingIntents

Question

我正在设置这样的警报:

alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime, pendingEvent);

我有兴趣删除之前设置的所有警报,清除它们.

有没有办法让我这样做或获取当前设置的所有警报,以便我可以手动删除它们？

Answer 1

您不必继续参考它.只需定义一个新的PendingIntent,就像你在创建它时定义的那样.

例如:

如果我创建了一个由AlarmManager触发的PendingIntent,如下所示:

   Intent alarmIntent = new Intent(getApplicationContext(), AlarmBroadcastReceiver.class);
    alarmIntent.setData(Uri.parse("custom://" + alarm.ID));
    alarmIntent.setAction(String.valueOf(alarm.ID));
    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

    PendingIntent displayIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, alarmIntent, 0);

    alarmManager.set(AlarmManager.RTC_WAKEUP, alarmDateTime, displayIntent);

然后在其他代码(甚至是其他活动)的某处,您可以取消:

Intent alarmIntent = new Intent(getApplicationContext(), AlarmBroadcastReceiver.class);
alarmIntent.setData(Uri.parse("custom://" + alarm.ID));
alarmIntent.setAction(String.valueOf(alarm.ID));
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

PendingIntent displayIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, alarmIntent, 0);

alarmManager.cancel(displayIntent);

这里重要的是将PendingIntent设置为完全相同的数据和操作,以及其他标准以及此处所述http://developer.android.com/reference/android/app/AlarmManager.html#cancel%28android.app .PendingIntent 29%

Answer 2

您需要创建待处理的意图,然后取消它

 AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

    Intent updateServiceIntent = new Intent(context, MyPendingIntentService.class);
    PendingIntent pendingUpdateIntent = PendingIntent.getService(context, 0, updateServiceIntent, 0);

    // Cancel alarms
    try {
        alarmManager.cancel(pendingUpdateIntent);
    } catch (Exception e) {
        Log.e(TAG, "AlarmManager update was not canceled. " + e.toString());
    }

Answer 3

要取消警报,您需要重新创建相同的PendingIntent并传递相同的请求代码.

因此,我创建了一个AlarmUtils来帮助我保存首选项中的所有请求代码,以便将来取消它时如果需要的话.您只需使用以下类并调用以下方法:

• addAlarm 添加新警报并传递请求代码.
• cancelAlarm要删除警报,您需要重新创建相同的
  Intent并传递相同的请求代码.
• hasAlarm 要验证该警报是否已添加,您需要重新创建相同的Intent并传递相同的请求代码.
• cancelAllAlarms 删除所有设置的警报.

我的AlarmUtils

public class AlarmUtils {

    private static final String sTagAlarms = ":alarms";

    public static void addAlarm(Context context, Intent intent, int notificationId, Calendar calendar) {

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, notificationId, intent, PendingIntent.FLAG_CANCEL_CURRENT);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        } else {
            alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
        }

        saveAlarmId(context, notificationId);
    }

    public static void cancelAlarm(Context context, Intent intent, int notificationId) {
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, notificationId, intent, PendingIntent.FLAG_CANCEL_CURRENT);
        alarmManager.cancel(pendingIntent);
        pendingIntent.cancel();

        removeAlarmId(context, notificationId);
    }

    public static void cancelAllAlarms(Context context, Intent intent) {
        for (int idAlarm : getAlarmIds(context)) {
            cancelAlarm(context, intent, idAlarm);
        }
    }

    public static boolean hasAlarm(Context context, Intent intent, int notificationId) {
        return PendingIntent.getBroadcast(context, notificationId, intent, PendingIntent.FLAG_NO_CREATE) != null;
    }

    private static void saveAlarmId(Context context, int id) {
        List<Integer> idsAlarms = getAlarmIds(context);

        if (idsAlarms.contains(id)) {
            return;
        }

        idsAlarms.add(id);

        saveIdsInPreferences(context, idsAlarms);
    }

    private static void removeAlarmId(Context context, int id) {
        List<Integer> idsAlarms = getAlarmIds(context);

        for (int i = 0; i < idsAlarms.size(); i++) {
            if (idsAlarms.get(i) == id)
                idsAlarms.remove(i);
        }

        saveIdsInPreferences(context, idsAlarms);
    }

    private static List<Integer> getAlarmIds(Context context) {
        List<Integer> ids = new ArrayList<>();
        try {
            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
            JSONArray jsonArray2 = new JSONArray(prefs.getString(context.getPackageName() + sTagAlarms, "[]"));

            for (int i = 0; i < jsonArray2.length(); i++) {
                ids.add(jsonArray2.getInt(i));
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return ids;
    }

    private static void saveIdsInPreferences(Context context, List<Integer> lstIds) {
        JSONArray jsonArray = new JSONArray();
        for (Integer idAlarm : lstIds) {
            jsonArray.put(idAlarm);
        }

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putString(context.getPackageName() + sTagAlarms, jsonArray.toString());

        editor.apply();
    }
}