设备休眠时Timer Task暂停问题求助（已排除电池优化）

我正在开发一款类似Focus To Do的计时器应用，用前台服务（Foreground Service）结合TimerTask实现核心计时功能。现在碰到个问题：设备锁屏休眠后，TimerTask就不再触发了；等设备亮屏，之前没执行的任务会一下子批量触发。

我的Timer间隔设的是100ms，但UI每1秒更新一次，而且应用已经被排除在电池优化之外了。

自定义CustomTimer类代码如下：

abstract class CustomTimer @JvmOverloads constructor(
    private val totalTime: Long,
    private val interval: Long,
    private val delay: Long = 0
) : Timer("PreciseCountdownTimer", true) {
    private var task: TimerTask
    private var startTime: Long = -1
    private var timeLeft: Long = 0
    private var restart = false
    private var wasCancelled = false
    private var isDisposed = false
    private var wasStarted = false

    init {
        task = buildTask(totalTime)
        isDisposed = false
    }

    private fun buildTask(totalTime: Long): TimerTask {
        return object : TimerTask() {
            override fun run() {
                if (startTime < 0 || restart) {
                    startTime = scheduledExecutionTime()
                    timeLeft = totalTime
                    restart = false
                } else {
                    timeLeft = totalTime - (scheduledExecutionTime() - startTime)
                    if (timeLeft <= 0) {
                        this.cancel()
                        wasCancelled = true
                        startTime = -1
                        Log.d("shower", "run: ")
                        onFinished()
                        return
                    }
                }

                onTick(timeLeft)
            }
        }
    }

    fun getTimeLeft() = timeLeft
    fun start() {
        wasStarted = true
        isDisposed = false
        this.scheduleAtFixedRate(task, delay, interval)
    }

    fun stop() {
        wasCancelled = true
        task.cancel()
        onStop()
    }

    fun restart() {
        if (!wasStarted) {
            start()
        } else if (wasCancelled) {
            wasCancelled = false
            task = buildTask(totalTime)
            start()
        } else {
            restart = true
        }
    }


    fun isDisposed() = isDisposed
    fun pause() {
        wasCancelled = true
        task.cancel()
        onPaused()
    }

    fun updateWithNewTime(time : Long){
        task.cancel()
        task = buildTask(time)
        startTime = -1
        start()
    }

    fun resume() {
        wasCancelled = false
        isDisposed = false
        task = buildTask(timeLeft)
        startTime = -1
        start()
        onResumed()
    }

    // Call this when there's no further use for this timer
    fun dispose() {
        this.cancel()
        this.purge()
        isDisposed = true
    }

    abstract fun onTick(timeLeft: Long)
    abstract fun onFinished()
    abstract fun onPaused()
    abstract fun onResumed()
    abstract fun onStop()
}

日志文件验证了这个问题：第3秒到第16秒期间没有任务触发，第16、17秒时任务快速批量触发（日志每1秒更新一次）。

内容的提问来源于stack exchange，提问作者shahram_javadi