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Android如何獲取當(dāng)前CPU頻率和占用率

更新時間：2025年03月12日 16:00:54 作者：microhex

最近在優(yōu)化 App 的性能,需要獲取當(dāng)前 CPU視頻頻率和占用率,所以本文小編就來和大家總結(jié)一下如何在Android中獲取當(dāng)前CPU頻率和占用率吧

最近在優(yōu)化 App 的性能，需要獲取當(dāng)前 CPU視頻頻率和占用率，通過查詢資料，大致思路如下：

目前沒有標(biāo)準(zhǔn)的 API 來獲取 CPU 的使用頻率，只能通過讀取指定 CPU 文件獲取當(dāng)前 CPU 頻率，在某些機(jī)器或者特定版本中，可能需要ROOT 權(quán)限或者特殊權(quán)限，因此會存在一定幾率的失敗，因此需要做好 Try…catch 動作。又因為現(xiàn)在手機(jī) CPU 的多核數(shù)目，因此我們可能需要獲取多個 CPU 頻率數(shù)，并取平均值。

獲取系統(tǒng) CPU 核心數(shù)：

 val cpuCoreNum = Runtime.getRuntime().availableProcessors()

獲取指定 CPU 當(dāng)前頻率：

/sys/devices/system/cpu/cpu${index}/cpufreq/scaling_cur_freq

那么核心代碼為：

private fun getAllCpuCoreFrequency() : Long {

        var frequency = 0L

        for (index in 0 until  cpuCoreNum){
            frequency += readFile("/sys/devices/system/cpu/cpu$index/cpufreq/scaling_cur_freq")
        }

        BLog.d("frequency : $frequency")

        return frequency / cpuCoreNum
    }


  private fun readFile(filePath: String): Long{
        try {
            val file = RandomAccessFile(filePath, "r")
            val content = file.readLine()
            file.close()

            if (TextUtils.isEmpty(content)){
                return 0L
            }

            BLog.d("readFile content : $content")

            return content.trim().toLong()

        }catch (e : Exception){
            e.printStackTrace()

           return 0L
        }
    }

如果需要獲取 CPU 的占用率，那么就需要知道每個核心的最大頻率和最小頻率，同樣是通過文件獲取：

//max frequency file
/sys/devices/system/cpu/cpu${index}/cpufreq/cpuinfo_max_freq

???????//min frequency file
/sys/devices/system/cpu/cpu${index}/cpufreq/cpuinfo_min_freq

那么核心代碼為：

object CPUUtils {

    private var cpuCoreNum = 0
    private var cpuMaxFrequency = 0L
    private var cpuMinFrequency = 0L

    fun initCpuCoreNum(){
        if (cpuCoreNum <= 0 || cpuMaxFrequency <= 0L || cpuMinFrequency <= 0L){

            cpuCoreNum = Runtime.getRuntime().availableProcessors()
            initMaxAndMinFrequency()

            if (cpuCoreNum > 0 && cpuMaxFrequency > 0L && cpuMinFrequency > 0L){
               SpManager.getInstance().setCanUseCPUFrequency(true)
            }
        }

        BLog.d("cpuCoreNum : $cpuCoreNum")
    }

    private fun initMaxAndMinFrequency()  {
        if (cpuCoreNum <= 0){
            return
        }

        cpuMaxFrequency = 0L
        cpuMinFrequency = 0L

        for (index in 0 until cpuCoreNum){
            cpuMaxFrequency += readFile("/sys/devices/system/cpu/cpu${index}/cpufreq/cpuinfo_max_freq")
            cpuMinFrequency += readFile("/sys/devices/system/cpu/cpu${index}/cpufreq/cpuinfo_min_freq")
        }


        BLog.d("cpuMaxFrequency : $cpuMaxFrequency, cpuMinFrequency : $cpuMinFrequency")
    }


    private fun readFile(filePath: String): Long{
        try {
            val file = RandomAccessFile(filePath, "r")
            val content = file.readLine()
            file.close()

            if (TextUtils.isEmpty(content)){
                return 0L
            }

            BLog.d("readFile content : $content")

            return content.trim().toLong()

        }catch (e : Exception){
           ExceptionHandler.recordException(e)

           return 0L
        }
    }
    
    private fun getAllCpuCoreFrequency() : Long {
        initCpuCoreNum()

        if (cpuCoreNum <=0){
            return 0L
        }

        var frequency = 0L

        for (index in 0 until  cpuCoreNum){
            frequency += readFile("/sys/devices/system/cpu/cpu$index/cpufreq/scaling_cur_freq")
        }

        BLog.d("frequency : $frequency")

        return frequency
    }

    fun findCurrentFrequencyPercent() : Long {

        val currentFrequency = getAllCpuCoreFrequency()

        BLog.d("currentFrequency : $currentFrequency, cpuMinFrequency : $cpuMinFrequency, cpuMaxFrequency : $cpuMaxFrequency")

        if (cpuMaxFrequency - cpuMinFrequency <= 0L || currentFrequency - cpuMinFrequency < 0L || cpuMaxFrequency - currentFrequency < 0L){
            return 0L
        }

        return (currentFrequency - cpuMinFrequency) * 100 / (cpuMaxFrequency - cpuMinFrequency)
    }


    fun getCpuCoreFrequency() : Long {
        initCpuCoreNum()

        if (cpuCoreNum <=0){
            return 0L
        }

        return getAllCpuCoreFrequency() / cpuCoreNum
    }

}

獲取 CPU 頻率：