CODEWITHSUNDEEP
javaandroidmathtimerclock
Ruchir Baronia
Ruchir Baronia

Reputation: 7561

Round CountDown timer? (millispersecond accuracy)?

I am using countDownTimer in my code. The problem is, countdowntimer is not accurate. The onTick method will not always execute every second, it can be a few milliseconds off. This becomes an issue when trying to execute a certain task based on millisUntilFinished. I am trying to log when ten seconds of my 20 second timer has passed:

Here is the relevant code:

    if (millisUntilFinished == 10000) { //TEN SECONDS

                Log.v(TAG, "TEN SECONDS LEFT");
            }

The issue arises here, as countDownTimer may never even have millisUntilFinished == 10000, it may equal 1001 and so my code will not execute. Is there anyway to somehow round the millisUntilFinished (which is a long) to the nearest thousands? I have tried the following:

 millisUntilFinishedRounded = MathUtils.round((double) millisUntilFinished, -3); // nearest thousand, 2000.0

but I cannot resolve 'MathUtils'

I am lost. I would really appreciate any feedback (positive or negative)! Thank you so much for all of your help.

{Rich}

Upvotes: 0

Views: 335

Answers (1)

Andy Turner
Andy Turner

Reputation: 140319

There are a few alternatives:

  1. You can round a positive integer to the nearest N by adding N/2, dividing by N and multiplying by N again:

    ((500 + millisUntilFinished) / 1000) * 1000

  2. You can use a condition which just checks if the value is in the range which would be rounded to 10000:

    millisUntilFinished >= 9500 && millisUntilFinished < 10500

  3. You can check for the first time that millisUntilFinished drops below 10000:

    boolean printedMessage = false;
while (true) {
  millisUntilFinished = ...
  if (!printedMessage && millisUntilFinished < 10000) {
    System.out.println("Your message");
    printedMessage = true;
  }
}

Upvotes: 1

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