使用 for-loop Android Kotlin 创建多个倒数计时器

Question

我目前在使用 Kotlin 的 CountDownTimer 时遇到问题。

我正在尝试实现一个计时器，它从 45 秒开始倒计时，然后从 30 秒开始倒计时指定的次数。

实际发生的是 for 循环经历所有迭代，当它到达最后一次迭代时，它启动计时器并且只运行一次。

我认为这可能是线程引起的，但我不是 100% 确定，也没有找到与此相关的任何内容，所以我可能是错的。

我看到了几个类似的问题，但都没有有效的答案：

countdown timer loop android
How to loop countdown timer multiple times

这里是 class:


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
    }
}

在此先感谢您提供的任何帮助。

Answer 1

当你开始的时候，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)

    }

然后你可以，例如，删除它，然后再拿第一个。

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而只取第二个，但这需要更改 startWorkout(workoutSet: WorkoutSet) 函数以便也传递列表的索引。

使用 for-loop Android Kotlin 创建多个倒数计时器

Creating multiple countdown timers with a for-loop Android Kotlin

android

countdowntimer

kotlin