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《Android如何获取当前CPU频率和占用率》最近在优化App的性能,需要获取当前CPU视频频率和占用率,所以本文小编就来和大家总结一下如何在Android中获取当前CPU频率和占用率吧...
最近在优化 App 的性能,需要获取当前 CPU视频频率和占用率,通过查询资料,大致思路如下:
目前没有标准的 API 来获取 CPU 的使用频率,只能通过读取指定 CPU 文件获取当前 CPU 频率,在某些机器或者特定版本中,可能需要ROOT 权限或者特殊权限,因此会存在一定几率的失败,因此需要做好 Try…catch 动作。又因为现在手机 CPU 的多核数目,因此我们可能需要获取多个 CPU 频率数,并取平均值。
获取系统 CPU 核心数:
val cpuCoreNum = Runtime.getRuntime().availableProcessors()
获取指定 CPU 当前频率:
/sys/devices/system/cpu/cpu${index}/cpufreq/scaling_cur_freq
那么核心代码为:
private fun getAllCpuCoreFrequency() : Long { vSXxORwTXar frequency = 0L for (index in 0 until cpuCoreNum){ frequency += readFile("/sys/devices/system/cpu/cpu$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 : $content") return content.trim().toLong() }catch (e : Exception){ e.printStackTrace() return 0L } }
如果需要获取 CPU 的占用率,那么就需要知道每个核心的最大频率和最小频率,同样是通过文件获取:
//max frequency file /sys/devices/system/cpu/cpu${index}/cpufreq/cpuinfo_max_freq //min frequency file /sys/devices/system/cpu/cpu${index}/cpufreq/cpuinfo_min_freq
那么核心代码为:
object CPUUtils { private var cpuCoreNum = 0 private var cpuMaxFrequency = 0L private var cpuMinFrequency = 0L fun initCpuCoreNum(){ if (China编程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 : $cpuCoreNum") } private fun initMaxAndMinFrequency() { if (cpuCoreNum <= 0){ return } cpuMaxFrequency = 0L cpuMinFrequency = 0L http://www.chinasem.cn for (index in 0 until cpuCoreNum){ cpuMaxFrequency += readFile("/sys/devices/system/cpu/cpu${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 = RandomAjavascriptccessFile(filePath, "r") val content = file.readLine() file.close() if (TextUtils.isEmpty(content)){ return 0L android } 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 } }
获取 CPU 频率:
CPUUtils.getCpuCoreFrequency()
获取 CPU 占用率:
CPUtils.findCurrentFrequencyPercent()
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