[김예란_Android] 6주차 과제 제출 #6
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kongwoojin
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Nov 25, 2025
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| var time = 0 | ||
| var isRunning = false | ||
| var lapList = mutableListOf<String>() | ||
| var timerJob: Job? = null | ||
| var timerTask: Timer? = null | ||
| var lapAdapter = LapAdapter(lapList) |
| recyclerView.adapter = lapAdapter | ||
| textViewTime.text = "00:00:00" | ||
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| fun formatTime(millis: Int): String { |
| val minutes = ((millis % 3600000) / 60000) | ||
| val seconds = ((millis % 60000) / 1000) | ||
| val ms = ((millis % 1000) / 10) | ||
| return String.format(Locale.US, "%02d:%02d:%02d", minutes, seconds, ms) |
| isRunning = true | ||
| timerJob = lifecycleScope.launch { | ||
| while (isRunning) { | ||
| delay(10) |
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Coroutine에서 delay를 10ms만큼 준다고 실제 10ms만큼만 delay가 생기지 않습니다.
예를 들어, delay(1000)에 대해 전후에 System.currentTimeMillis()를 로그로 찍어보면, 실제로 1000ms만큼 차이가 나는 것이 아니라 오차가 발생하는 것을 확인할 수 있습니다.
왜 이런 현상이 발생하는지도 알아보시면 좋을 것 같아요.
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| buttonLap.setOnClickListener{ | ||
| val currentTime = textViewTime.text.toString() | ||
| lapList.add(0, currentTime) |
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0번 인덱스에 추가하는 방법도 좋은 방법이지만, recyclerview 자체를 반대로 뒤집을 수도 있어요
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