如何使用Kotlin Android以编程方式获取CPU使用率？

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.GET_TASKS" />

import java.io.IOException
import java.io.RandomAccessFile

class CpuUsageMonitor {
    private var lastTotalCpuTime: Long = 0
    private var lastProcessCpuTime: Long = 0

    fun getProcessCpuUsage(): Float {
        val processCpuTime = getProcessCpuTime()
        val totalCpuTime = getTotalCpuTime()

        val elapsedTime = processCpuTime - lastProcessCpuTime
        val totalElapsedTime = totalCpuTime - lastTotalCpuTime

        val cpuUsage = (elapsedTime.toFloat() / totalElapsedTime.toFloat()) * 100

        lastProcessCpuTime = processCpuTime
        lastTotalCpuTime = totalCpuTime

        return cpuUsage
    }

    private fun getProcessCpuTime(): Long {
        val processId = android.os.Process.myPid()
        var processCpuTime: Long = 0

        try {
            val fileReader = RandomAccessFile("/proc/$processId/stat", "r")
            val stat = fileReader.readLine()
            val stats = stat.split(" ".toRegex()).toTypedArray()

            val utime = stats[13].toLong()
            val stime = stats[14].toLong()
            val cutime = stats[15].toLong()
            val cstime = stats[16].toLong()

            processCpuTime = utime + stime + cutime + cstime
        } catch (e: IOException) {
            e.printStackTrace()
        }

        return processCpuTime
    }

    private fun getTotalCpuTime(): Long {
        var totalCpuTime: Long = 0

        try {
            val fileReader = RandomAccessFile("/proc/stat", "r")
            val stat = fileReader.readLine()
            val stats = stat.split(" ".toRegex()).toTypedArray()

            val user = stats[2].toLong()
            val nice = stats[3].toLong()
            val system = stats[4].toLong()
            val idle = stats[5].toLong()

            totalCpuTime = user + nice + system + idle
        } catch (e: IOException) {
            e.printStackTrace()
        }

        return totalCpuTime
    }
}

val cpuUsageMonitor = CpuUsageMonitor()
val cpuUsage = cpuUsageMonitor.getProcessCpuUsage()
println("CPU Usage: $cpuUsage%")