内存信息中最有用的就是PSS了，还有各种零碎的，在android.os.Debug中可以直接拿到MemeryInfo
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MemoryInfo utInfo = new MemoryInfo(); android.os.Debug.getMemoryInfo(utInfo); info.dalvikPrivateDirty = utInfo.dalvikPrivateDirty; info.dalvikPss = utInfo.dalvikPss; info.dalvikSharedDirty = utInfo.dalvikSharedDirty; info.nativePrivateDirty = utInfo.nativePrivateDirty; info.nativePss = utInfo.nativePss; info.nativeSharedDirty = utInfo.nativeSharedDirty; info.otherPss = utInfo.otherPss; info.otherPrivateDirty = utInfo.otherPrivateDirty; info.otherSharedDirty = utInfo.otherSharedDirty; info.totalPss = utInfo.getTotalPss(); |
cpu信息分两类，总的cpu使用率，取proc/stat的数据，这个样子
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cpu 192369 7119 480152 122044337 14142 9937 26747 0 0 |
取到之后解析，拿到使用时间和空闲时间
隔一段时间后，再取一次数据，即可得到cpu使用时间
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private float readUsage() { try { RandomAccessFile reader = new RandomAccessFile("/proc/stat", "r"); String load = reader.readLine(); String[] toks = load.split(" "); long idle1 = Long.parseLong(toks[5]); long cpu1 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4]) + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]); try { Thread.sleep(360); } catch (Exception e) {} reader.seek(0); load = reader.readLine(); reader.close(); toks = load.split(" "); long idle2 = Long.parseLong(toks[5]); long cpu2 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4]) + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]); return (float)(cpu2 - cpu1) / ((cpu2 + idle2) - (cpu1 + idle1)); } catch (IOException ex) { ex.printStackTrace(); } return 0; } |
当前进程的cpu使用率计算方法和总的相似，只不过路径变成了proc/<pid>/stat
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Table 1-3: Contents of the stat files (as of 2.6.22-rc3) .............................................................................. Field Content pid process id tcomm filename of the executable state state (R is running, S is sleeping, D is sleeping in an uninterruptible wait, Z is zombie, T is traced or stopped) ppid process id of the parent process pgrp pgrp of the process sid session id tty_nr tty the process uses tty_pgrp pgrp of the tty flags task flags min_flt number of minor faults cmin_flt number of minor faults with child's maj_flt number of major faults cmaj_flt number of major faults with child's utime user mode jiffies stime kernel mode jiffies cutime user mode jiffies with child's cstime kernel mode jiffies with child's |
解析数据代码如下，如果不计算子进程时间则只用toks[13]和toks[14]
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reader = new RandomAccessFile("/proc/" + android.os.Process.myPid() + "/stat", "r"); String currentStat = reader.readLine(); toks = currentStat.split(" "); // include child or (13 + 14) current_process_usetime = Long.parseLong(toks[13]) + Long.parseLong(toks[14]) + Long.parseLong(toks[15]) + Long.parseLong(toks[16]); reader.close(); |
取到之后除以总的cpu时间，即
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long totalCPUTime = (cpu2 + idle2) - (cpu1 + idle1); currentCPUUsage = (float)(current_process_usetime - last_process_usetime) / totalCPUTime; |