AlarmManager在正确的时间无法在Samsung Phone上唤醒 [英] AlarmManager does not wakeup at right time on Samsung Phone

问题描述

不幸的是，在某些三星手机上，我们不得不发现AlarmManager（SamsungAlarmManager）无法正常工作。

On some Samsung phones we unfortunately had to find out that the AlarmManager (SamsungAlarmManager) does not work like expected.

我们的代码是：

private void scheduleNextSamplingIntent(final Context context, final int intervalInMillis) {
    Log.v(TAG, "scheduleNextSamplingIntent |  intervalInMillis = " + intervalInMillis);

    if (intervalInMillis <= 0) {
        Log.w(TAG, "scheduleNextSamplingIntent | invalid interval " + intervalInMillis);
        return;
    }

    long currentTimeMillis = DeviceClock.getInstance().getCurrentTimeMillis();
    long triggerAtMillis = currentTimeMillis + intervalInMillis;
    Log.v(TAG, "scheduleNextSamplingIntent |  currentTimeMillis = " + currentTimeMillis);
    Log.v(TAG, "scheduleNextSamplingIntent |  triggerAtMillis = " + triggerAtMillis);


    PendingIntent samplingPendingIntent = getSamplePendingIntent(context);

    AlarmManagerCompat alarmManager = new AlarmManagerCompat(context);

    alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, triggerAtMillis, samplingPendingIntent);
}

我们怀疑一段时间后会唤醒应用程序（例如1分钟），但有时计时器醒来的时间太晚了！

We suspect, that the application will be waked up after a time (for example 1min) , but sometimes the timer is waking up some minutes too late!

logcat输出为：

The logcat output is:

10-25 15:26:03.118 32734 32734 I MotionDetectorService: Analyzed motion: SLEEPING
10-25 15:26:03.120 32734 32734 D MotionDetector: symptomaticStateGracePeriodOver ? 1540473963119 - 1540473823091 = 140028 ?> 300000
10-25 15:26:03.120 32734 32734 D MotionDetector: Still symptomatic but grace period not over yet. Keep gracing ...
10-25 15:26:03.121 32734 32734 V MotionDetectorService: notifyListeners | MotionDetector
10-25 15:26:03.121 32734 32734 V MotionDetectorService: scheduleNextSamplingIntent | intervalInMillis = 13000
10-25 15:26:03.122 32734 32734 V MotionDetectorService: scheduleNextSamplingIntent | currentTimeMillis = 1540473963121
10-25 15:26:03.122 32734 32734 V MotionDetectorService: scheduleNextSamplingIntent | triggerAtMillis = 1540473976121
10-25 15:26:03.137 3781 4353 D SamsungAlarmManager: setExact Intent (T:0/F:5/AC:false) 20181025T153059 - CU:10227/CP:32734

计时器应在1540473976（Unix）上触发=> 2018-10-25T15：26：16

The timer should be triggered on 1540473976 (Unix) => 2018-10-25T15:26:16

但是为什么将SamsungAlarmManager设置为15:30:59？

But why is SamsungAlarmManager set to 15:30:59?

这是怎么了？有任何建议吗？

What is Wrong here? Any suggestions?

（看来问题仅在具有Android 8.0的Samsung S8和Samsung S7设备上出现）

(It seems as the Problem is only on Samsung S8 and Samsung S7 devices with Android 8.0)

推荐答案

经过数小时的测试，我们发现了一种解决方法，可以在不到5分钟的三星android手机上启动计时器。

After hours of testing we found a workaround to start timers less than 5 min on Samsung android phone.

在空闲模式下经过一段时间后，SamsungAlarmManager不允许设置少于5分钟的计时器。如果手机处于空闲模式（打light模式），则由于电池优化，SamsungAlarmManager会将setExact-Time从13s覆盖到5分钟。将应用程序放入电池优化白名单（不受电池监控的应用程序）无济于事！ （似乎三星简单地忽略了此列表！！！！）

I seems that after some time in idle mode the SamsungAlarmManager does not allow setting timers less than 5 min. If the phone is in idle mode (doze light mode) the SamsungAlarmManager overwrite the setExact-Time from 13s to 5 min because of Battery optimization. Putting the App into the whitelist of Battery-optimization (Battery unmonitored apps) doesn't help anything! (It seems that Samsung simple ignores this list!!!)

我们的解决方法现在使用的是AlarmManager.setAlarmClock（）而不是setExactAndAllowWhileIdle（）。但是这种解决方案的缺点是在右上角显示了一个闹钟图标。
为避免这种情况，我们在电话处于交互状态时使用setExactAndAllowWhileIdle（），而只有在电话不交互时才使用setAlarmClock（）！

Our workaround is now using AlarmManager.setAlarmClock() instead of setExactAndAllowWhileIdle(). But this solution has the disadvantage of showing an alarm-clock-icon in the upper right corner. To avoid this, we are using setExactAndAllowWhileIdle() when the phone is interactive and setAlarmClock() only if it's not!

因此，我们的代码设置了计时器现在不到5分钟：

So, our code to set a timer less than 5 min is now:

public void setExactAndAllowWhileIdleOrAlarmClockWhenNotInteractive(final int type, final long triggetAtMillis, final PendingIntent operation) {

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && !mPowerManager.isInteractive()) {
        Log.v(TAG, "setExactAndAllowWhileIdleOrAlarmClockWhenNotInteractive | not interacive | setAlarmClock = " + triggetAtMillis);
        mAlarmManager.setAlarmClock(new AlarmManager.AlarmClockInfo(triggetAtMillis, operation), operation);
    } else {
        Log.v(TAG, "setExactAndAllowWhileIdleOrAlarmClockWhenNotInteractive | interacive | setExactAndAllowWhileIdle = " + triggetAtMillis);
        setExactAndAllowWhileIdle(type, triggetAtMillis, operation);
    }
}

注意：华为手机也有类似的问题三星手机！

Note: The Huawei phones have the same Problem's like the Samsung phones!

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