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)