get Process Cpu Rate - Android Hardware

Android examples for Hardware:CPU Information

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Description

get Process Cpu Rate

Demo Code


import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import android.app.ActivityManager.RunningAppProcessInfo;
import android.util.Log;

public class Main {
  public static List<RunningAppProcessInfo> mApp;
  public static long totalCpuTime = -1;
  public static long totalCpuBusyTime = -1;
  private static long totalCpu;
  private static long totalCpuBusy;
  private static long appCpuTime;

  public static List<String> getProcessCpuRate(List<RunningAppProcessInfo> app) {
    mApp = app;//  w  w  w  .  ja v a  2 s.com
    long totalCpuTime2;
    long totalCpuBusy2;
    long processCpuTime2;
    if (totalCpuTime == -1) {
      getTotalCpuTime();
      totalCpuTime = totalCpu;
      totalCpuBusyTime = totalCpuBusy;
      appCpuTime = getAppCpuTime();
      try {
        Thread.sleep(360);
      } catch (Exception e) {
      }
      getTotalCpuTime();
      totalCpuTime2 = totalCpu;
      totalCpuBusy2 = totalCpuBusy;
      processCpuTime2 = getAppCpuTime();
    } else {
      getTotalCpuTime();
      totalCpuTime2 = totalCpu;
      totalCpuBusy2 = totalCpuBusy;
      processCpuTime2 = getAppCpuTime();
    }

    float cpuRate = 100.0f * (processCpuTime2 - appCpuTime) / (totalCpuTime2 - totalCpuTime);
    if (cpuRate < 0.0) {
      Log.d("hpp_pl", "processCpuTime2=" + processCpuTime2 + ",appCpuTime=" + appCpuTime + ",totalCpuTime2="
          + totalCpuTime2 + ",totalCpuTime=" + totalCpuTime);
      cpuRate = 0;
    }
    float totalcpuRate = 100.0f * (totalCpuBusy2 - totalCpuBusyTime) / (totalCpuTime2 - totalCpuTime);
    if (totalcpuRate < 0.0) {
      totalcpuRate = 0;
    }
    totalCpuTime = totalCpuTime2;
    totalCpuBusyTime = totalCpuBusy2;
    appCpuTime = processCpuTime2;
    List<String> rtnList = new ArrayList<String>();
    rtnList.add(String.format("%#.2f", cpuRate));
    rtnList.add(String.format("%#.2f", totalcpuRate));
    return rtnList;
  }

  public static void getTotalCpuTime() { // ???????CPU????
    String[] cpuInfos = null;
    try {
      BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("/proc/stat")), 1000);
      String load = reader.readLine();
      reader.close();
      cpuInfos = load.split(" ");
      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]);
      totalCpuBusy = Long.parseLong(cpuInfos[2]) + Long.parseLong(cpuInfos[3]) + Long.parseLong(cpuInfos[4])
          + Long.parseLong(cpuInfos[6]) + Long.parseLong(cpuInfos[7]) + Long.parseLong(cpuInfos[8]);
    } catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  public static long getAppCpuTime() { // ???????????CPU??
    String[] cpuInfos = null;
    long multyProcCpuTime = 0;
    for (RunningAppProcessInfo app : mApp) {
      try {
        int pid = app.pid;
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("/proc/" + pid + "/stat")),
            1000);
        String load = reader.readLine();
        reader.close();
        cpuInfos = load.split(" ");
        long appCpuTime = Long.parseLong(cpuInfos[13]) + Long.parseLong(cpuInfos[14]) + Long.parseLong(cpuInfos[15])
            + Long.parseLong(cpuInfos[16]);
        multyProcCpuTime += appCpuTime;
      } catch (Exception ex) {
        ex.printStackTrace();
        multyProcCpuTime += 0;
      }
    }
    return multyProcCpuTime;
  }
}

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