做了性能的工具 获取CPU信息 提示：W/System.err: java.io.FileNotFoundException: /proc/stat: open failed: EACCES (Permission denied)

Question

做了性能的工具 获取CPU信息 提示：W/System.err: java.io.FileNotFoundException: /proc/stat: open failed: EACCES (Permission denied)
说是拒绝访问 我用adb shell cat /prov/stat 可以显示CPU的相关数据 （使用AS的虚拟机进行测试，手头没有安卓机）

public double sampleCPU() {
long cpuTime;
long appTime;
double sampleValue = 0.0D;

    try {
        if (procStatFile == null || appStatFile == null) {
            procStatFile = new RandomAccessFile("/proc/stat", "r");
            appStatFile = new RandomAccessFile("/proc/" + Process.myPid()  + "/stat", "r");  ///proc/pid/stat下则是该pid的CPU使用情况
        } else {
            procStatFile.seek(0L);
            appStatFile.seek(0L);
        }
        String procStatString = procStatFile.readLine();
        String appStatString = appStatFile.readLine();

        String procStats[] = procStatString.split(" ");
        String appStats[] = appStatString.split(" ");
        cpuTime = Long.parseLong(procStats[2]) + Long.parseLong(procStats[3])
                + Long.parseLong(procStats[4]) + Long.parseLong(procStats[5])
                + Long.parseLong(procStats[6]) + Long.parseLong(procStats[7])
                + Long.parseLong(procStats[8]);
        appTime = Long.parseLong(appStats[13]) + Long.parseLong(appStats[14]);


        if (lastCpuTime == null && lastAppCpuTime == null) {
            lastCpuTime = cpuTime;
            lastAppCpuTime = appTime;
            return sampleValue;
        }
        sampleValue = ((double) (appTime - lastAppCpuTime) / (double) (cpuTime - lastCpuTime)) * 100D;
        lastCpuTime = cpuTime;
        lastAppCpuTime = appTime;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return sampleValue;
}

    求求大佬们看下 ， sampleValue 返回值一直是0.0 是说拒绝访问：W/System.err: java.io.FileNotFoundException: /proc/stat: open failed: EACCES (Permission denied)

Answer 1

https://blog.csdn.net/u010438632/article/details/47606813?locationNum=6