android - 如何从 AlarmManager 取消警报

Question

我也遇到过类似的问题。 Delete alarm from AlarmManager using cancel() - Android

"我正在尝试以两种不同的方法创建和删除警报，这两种方法都在应用程序的不同时刻调用。逻辑。

但是，当我调用 AlarmManager 的 cancel() 方法时，警报并没有被删除。"

为了设置:

            Intent myIntent = new Intent(getApplicationContext(),
                    SessionReceiver.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(
                    getApplicationContext(), 1, myIntent, 0);

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

            alarmManager.set(AlarmManager.RTC, now.getTimeInMillis(),
                    pendingIntent);

为了删除:

    AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    Intent myIntent = new Intent(getApplicationContext(),
            SessionReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(
            getApplicationContext(), 0, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    alarmManager.cancel(pendingIntent);

但这不会删除已注册的警报。提前致谢。

Answer 1

PendingIntent 需要完全按照启动 AlarmManager 时的方式创建，看起来主要问题是您使用了不同的 requestCode(零而不是一)。

为了快速修复，这应该可以:

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
                                 getApplicationContext(), 1, myIntent, 0);

alarmManager.cancel(pendingIntent);

为了使用 PendingIntent.FLAG_UPDATE_CURRENT 标志，见下文:

设置:

Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
                                getApplicationContext(), 1, myIntent, 
                                PendingIntent.FLAG_UPDATE_CURRENT);

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

alarmManager.set(AlarmManager.RTC, now.getTimeInMillis(), pendingIntent);

取消:

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
                                getApplicationContext(), 1, myIntent, 
                                PendingIntent.FLAG_UPDATE_CURRENT);

alarmManager.cancel(pendingIntent);