如何在Android设备上读取CPU频率
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How to read cpu frequency on android device
提问by michael
Is there any Java API for that? How can I read this information.
是否有任何 Java API？我怎样才能阅读这些信息。
回答by Ellis
To have frequency on Android, just read these special files in /sys directory:
要在 Android 上获得频率，只需读取 /sys 目录中的这些特殊文件：
#cat "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq"
#cat "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq"
#cat "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"
You will have current, min and max Frequency allowed.
您将拥有当前、最小和最大频率允许。
回答by zed_0xff
not MHz, but at least something. bogoMIPSvalue can be useful for you.
不是 MHz，但至少是某些东西。bogoMIPS值对您很有用。
private String ReadCPUinfo()
{
ProcessBuilder cmd;
String result="";
try{
String[] args = {"/system/bin/cat", "/proc/cpuinfo"};
cmd = new ProcessBuilder(args);
Process process = cmd.start();
InputStream in = process.getInputStream();
byte[] re = new byte[1024];
while(in.read(re) != -1){
System.out.println(new String(re));
result = result + new String(re);
}
in.close();
} catch(IOException ex){
ex.printStackTrace();
}
return result;
}
回答by Michael Kopp
If you are interested in how long your system spent in what state, check out the file
如果您对系统在何种状态下花费了多长时间感兴趣，请查看该文件
/sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state
I'm not sure, whether root access is necessary for that.
我不确定，是否需要 root 访问权限。
