Android获取CPU，内存等系统信息方法

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http://www.mobile-open.com/2015/38938.html

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http://www.thinksaas.cn/group/topic/350365

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http://www.zhihu.com/question/26600851

进入adb shell
1、dumpsys cpuinfo 看cpu
2、dumpsys meninfo 看内存

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http://www.2cto.com/kf/201403/285597.html

Android获取应用cpu使用率

public static float getProcessCpuRate()   {               float totalCpuTime1 = getTotalCpuTime();       float processCpuTime1 = getAppCpuTime();       try       {           Thread.sleep(360);                   }       catch (Exception e)       {       }               float totalCpuTime2 = getTotalCpuTime();       float processCpuTime2 = getAppCpuTime();               float cpuRate = 100 * (processCpuTime2 - processCpuTime1)               / (totalCpuTime2 - totalCpuTime1);               return cpuRate;   }       public static long getTotalCpuTime()   { // 获取系统总CPU使用时间       String[] cpuInfos = null;       try       {           BufferedReader reader = new BufferedReader(new InputStreamReader(                   new FileInputStream("/proc/stat")), 1000);           String load = reader.readLine();           reader.close();           cpuInfos = load.split(" ");       }       catch (IOException ex)       {           ex.printStackTrace();       }       long totalCpu = Long.parseLong(cpuInfos[2])               + Long.parseLong(cpuInfos[3]) + Long.parseLong(cpuInfos[4])               + Long.parseLong(cpuInfos[6]) + Long.parseLong(cpuInfos[5])               + Long.parseLong(cpuInfos[7]) + Long.parseLong(cpuInfos[8]);       return totalCpu;   }       public static long getAppCpuTime()   { // 获取应用占用的CPU时间       String[] cpuInfos = null;       try       {           int pid = android.os.Process.myPid();           BufferedReader reader = new BufferedReader(new InputStreamReader(                   new FileInputStream("/proc/" + pid + "/stat")), 1000);           String load = reader.readLine();           reader.close();           cpuInfos = load.split(" ");       }       catch (IOException ex)       {           ex.printStackTrace();       }       long appCpuTime = Long.parseLong(cpuInfos[13])               + Long.parseLong(cpuInfos[14]) + Long.parseLong(cpuInfos[15])               + Long.parseLong(cpuInfos[16]);       return appCpuTime;   }计算某个时间段内AppCpuTime与TotalCpuTime的变化，然后按照比例换算成该应用的Cpu使用率。Android系统本省也有一个类是用来显示Cpu使用率的：android/system/frameworks/base/packages/SystemUI/src/com/android/systemui/LoadAverageService.java阅读源码发现也是读取/proc目录下的文件来计算Cpu使用率 另外一种方式Runtime.getRuntime().exec("top -d 1 -n 1")，但是每次都获取到的cpu使用率为0，找不到原因

http://www.m2catalyst.com/tutorial-finding-cpu-usage-for-individual-android-apps/

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