AlarmManager running at the wrong time

问题

I am trying to put an AlarmManager to run every 3 min but it is running at wrong and varied times, moments in seconds and others does not run. I am trying to test on an Android 7.0 and another 6.0 device and both are running wrong, I saw the following comments but could not fix.

Alarm Manager Example AlarmManager fires alarms at wrong time Android AlarmManager fire at wrong time

The following code:

long repeatTime = 180000;

        AlarmManager processTimer = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent intentAlarm = new Intent(context, TimerProcessReceiver.class);
        PendingIntent pendingIntentAlarm = PendingIntent.getBroadcast(context, 0,
                intentAlarm, PendingIntent.FLAG_UPDATE_CURRENT);

        if (android.os.Build.VERSION.SDK_INT < 19) {
            processTimer.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
                    repeatTime, pendingIntentAlarm);
        } else {
            processTimer.setExact(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() +
                    repeatTime, pendingIntentAlarm);
        }

Still having problems, I've updated as above. Update as @Vyacheslav's reply

long repeatTime = 180000 + System.currentTimeMillis();
    AlarmManager processTimer = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    Intent intentAlarm = new Intent(context, ProcessReceiver.class);
    PendingIntent pendingIntentAlarm = PendingIntent.getBroadcast(context, 0,
            intentAlarm, PendingIntent.FLAG_UPDATE_CURRENT);

    int currentapiVersion = Build.VERSION.SDK_INT;

    if (Build.VERSION.SDK_INT >= 23) {
        processTimer.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,
                repeatTime, pendingIntentAlarm);

    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

            processTimer.setExact(AlarmManager.RTC_WAKEUP,
                    repeatTime, pendingIntentAlarm);

    } else if (currentapiVersion < Build.VERSION_CODES.KITKAT) {

        processTimer.set(AlarmManager.RTC_WAKEUP,  repeatTime,
                pendingIntentAlarm);

    }

In case I am using two simultaneous timers with the PendingIntent of ids 0 and 1 (but the structure of adding these PendingIntent are the same as the code above) but with the same runtime 3 min. Both are executing the wrong way in a few seconds and randomly.

回答1:

Use setExactAndAllowWhileIdle(int type, long triggerAtMillis, PendingIntent operation) instead. It helps to wakeup your device.

EDIT

 int currentapiVersion = android.os.Build.VERSION.SDK_INT;
        if (currentapiVersion < android.os.Build.VERSION_CODES.KITKAT){
            am.set(AlarmManager.RTC_WAKEUP, nexttime, pi);
        } else {
            if (currentapiVersion < android.os.Build.VERSION_CODES.M) {
                am.setExact(AlarmManager.RTC_WAKEUP, nexttime, pi);
            } else {
                    am.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, nexttime, pi);
            }
        }

来源：https://stackoverflow.com/questions/44285073/alarmmanager-running-at-the-wrong-time

标签

android

timer

alarmmanager