使用for循环Android Kotlin创建多个倒计时计时器

Question

我当前遇到Kotlin的CountDownTimer问题。

我正在尝试实现一个计时器，从45秒开始倒计时，然后在指定的次数内倒计时30秒。

实际发生的是，for循环经历了所有的迭代，当它到达最后一次迭代时，它启动计时器，只运行一次。

我认为这可能是由于线程的原因，但我不能100%确定，也没有找到任何与此相关的东西，所以我可能错了。

我看到过几个类似的问题，但都没有有效的答案：

• 倒计时循环android
• 如何多次循环倒计时计时器

这是类：

import android.os.Bundle
import android.os.CountDownTimer
import com.google.android.material.snackbar.Snackbar
import androidx.appcompat.app.AppCompatActivity
import ee.shanel.hiittimer.timer.HiitData
import ee.shanel.hiittimer.timer.Workout
import ee.shanel.hiittimer.timer.WorkoutSet
import kotlinx.android.synthetic.main.activity_timer.*
import kotlinx.android.synthetic.main.content_timer.*
class TimerActivity : AppCompatActivity() {
private var previousTimerActive = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_timer)
setSupportActionBar(toolbar)
fab.setOnClickListener { view ->
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
val workoutSets = calclateTimer()
for (workoutSet in workoutSets) {
startWorkout(workoutSet)
}
}
}
private fun startWorkout(workoutSet: WorkoutSet) {
timerStatusText.setText("Go")
timerStatusText.setText(workoutSet.status)
object : CountDownTimer(workoutSet.secs, 1000) {
override fun onTick(millisUntilFinished: Long) {
val minutesRemaining = millisUntilFinished / 60000
val secondsRemaining = (millisUntilFinished % 60000) / 1000
val minutes = appendZero(minutesRemaining)
val seconds = appendZero(secondsRemaining)
val timerText = "${minutes} : ${seconds}"
timer.setText(timerText)
}
override fun onFinish() {
}
}.start()

}

private fun calclateTimer(): ArrayList<WorkoutSet> {
val hiitData = getIntent().getExtras().getParcelable<HiitData>("hiitData")
val workout: ArrayList<WorkoutSet> = ArrayList()
for (i in 0..hiitData.sets) {
val work = WorkoutSet("Workout", (hiitData.workoutSecs * 1000).toLong())
val rest = WorkoutSet("Rest", (hiitData.restSecs * 1000).toLong())
workout.add(work)
if (i != hiitData.sets) {
workout.add(rest)
}
}
return workout
}
private fun appendZero(time: Long): String {
val timeString = time.toString()
return if (time < 10) "0$timeString" else timeString
}
}

提前感谢你能提供的任何帮助。

Answer 1

当你开始时，你应该拿第一个。

fab.setOnClickListener { view ->
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
val workoutSets = calclateTimer()
workoutSet = workoutSets.get(0)
startWorkout(workoutSet)
}

然后，例如，您可以将其移除，然后重新获取第一个。

private fun startWorkout(workoutSet: WorkoutSet) {
timerStatusText.setText("Go")
timerStatusText.setText(workoutSet.status)
object : CountDownTimer(workoutSet.secs, 1000) {
override fun onTick(millisUntilFinished: Long) {
val minutesRemaining = millisUntilFinished / 60000
val secondsRemaining = (millisUntilFinished % 60000) / 1000
val minutes = appendZero(minutesRemaining)
val seconds = appendZero(secondsRemaining)
val timerText = "${minutes} : ${seconds}"
timer.setText(timerText)
}
override fun onFinish() {
workoutSets.remove(workoutSet)
workoutSet = workoutSets.get(0)
startWorkout(workoutSet)
}
}.start()
}

也可以选择不删除它，只取第二个，但这需要更改startWorkout(workoutSet: WorkoutSet)函数才能传递列表的索引。