怎么就millisUntilFinished无法检测准确CountDownTimer间隔？ [英] How come millisUntilFinished cannot detect exact CountDownTimer intervals?

问题描述

嘿所有，所以有一个相当小的，但恼人的问题与CountDownTimer。目前我有一个时间间隔设置为1000，我试图来检测留在毫秒数我的

  onTick（）
 

方法。所以，我可以使用文本到语音的时候还有20秒结束，还剩下10秒，等等。那么，如果我使用：

  //说话的时候离开20秒
如果（millisUntilFinished == 20000）{
    tts.speak（你还剩20秒。，TextToSpeech.QUEUE_FLUSH，NULL）;
}
 

定时器不能准确地检测出了20000毫秒。

所以，我不得不求助于使用：

  //说话的时候离开20秒
如果（millisUntilFinished＆LT; 20999）{
    如果（millisUntilFinished＆GT; 19999）{
       tts.speak（你还剩20秒。，TextToSpeech.QUEUE_FLUSH，NULL）;
     }
}
 

这问题是，有时文本到语音将是期间加油两次。有什么方法来检测毫秒正好让我没有使用大于或小于？

解决方案

  

有什么方法来检测毫秒正好让我没有使用大于或小于？

当然不是。 Android是不是一个实时操作系统。时间将是近似的，只是由于主应用程序线程被在任何特定时刻可能忙于其他工作。

Hey all, so there is a rather small but annoying problem with the CountDownTimer.. Currently I have an interval set to 1000. And I am trying to detect the amount of milliseconds left in my

onTick()

method. So that I can use Text To Speech when there are 20 seconds left, 10 seconds left, etc. Well if I use:

//Speak when 20 seconds left
if (millisUntilFinished == 20000) {
    tts.speak("You have 20 seconds left.", TextToSpeech.QUEUE_FLUSH, null);
}

The timer is not able to detect the 20000 milliseconds exactly.

So I have to resort to using:

//Speak when 20 seconds left
if (millisUntilFinished < 20999) {
    if (millisUntilFinished > 19999) {
       tts.speak("You have 20 seconds left.", TextToSpeech.QUEUE_FLUSH, null);
     } 
}

The problem with that is that sometimes the text to speech will come on twice during that interval. Is there any way to detect the milliseconds exactly so I dont have to use greater than or less than?

解决方案

Is there any way to detect the milliseconds exactly so I dont have to use greater than or less than?

Of course not. Android is not a RTOS. Timing will be approximate, simply due to the main application thread being possibly occupied with other duties at any given moment.

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