Question

我发现此代码可以获得整体cpu使用率。这是否可以将其转换为通过进程告诉cpu使用情况？是否有任何API可以让我们获得android的CPU或内存使用？

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;
}

Answer 1

Context context = this.getApplicationContext();
ActivityManager mgr = (ActivityManager)context.getSystemService(ACTIVITY_SERVICE);
List<RunningAppProcessInfo> processes = mgr.getRunningAppProcesses();
Log.e("DEBUG", "Running processes:");
for(Iterator i = processes.iterator(); i.hasNext(); )
{
    RunningAppProcessInfo p = (RunningAppProcessInfo)i.next();
    Log.e("DEBUG", "  process name: "+p.processName);
    Log.e("DEBUG", "     pid: "+p.pid);                    
    int[] pids = new int[1];
    pids[0] = p.pid;
    android.os.Debug.MemoryInfo[] MI = mgr.getProcessMemoryInfo(pids);
    Log.e("memory","     dalvik private: " + MI[0].dalvikPrivateDirty);
    Log.e("memory","     dalvik shared: " + MI[0].dalvikSharedDirty);
    Log.e("memory","     dalvik pss: " + MI[0].dalvikPss);            
    Log.e("memory","     native private: " + MI[0].nativePrivateDirty);
    Log.e("memory","     native shared: " + MI[0].nativeSharedDirty);
    Log.e("memory","     native pss: " + MI[0].nativePss);            
    Log.e("memory","     other private: " + MI[0].otherPrivateDirty);
    Log.e("memory","     other shared: " + MI[0].otherSharedDirty);
    Log.e("memory","     other pss: " + MI[0].otherPss);

    Log.e("memory","     total private dirty memory (KB): " + MI[0].getTotalPrivateDirty());
    Log.e("memory","     total shared (KB): " + MI[0].getTotalSharedDirty());
    Log.e("memory","     total pss: " + MI[0].getTotalPss());            
}

在现代操作系统中，app使用共享库。因此，使用了一些存储器通过多个应用程序，确定应用程序内存使用情况变得复杂。
dalvikPrivateDirty是将由java释放的内存如果进程被终止，则为虚拟机
nativePrivateDirty与本机代码相同，对于某些人来说是相同的其他代码（不知道还有什么）
otherPrivateDirty dalvikSharedDirty是使用的共享内存 java虚拟机但是这不会被释放
如果这个应用程序被杀死dalvikPss - 估计内存是多少应用程序使用。这包括所有私人记忆和一个
共享内存的一部分检查pss＆gt; = private原因
只使用一小部分共享内存是为了这样所有负责任的应用程序共享内存使用的合理性

此值用于估计应用的内存负载。

总数是dalvik，native和其他的总和。

Answer 2

读/ proc / [pid] / stat - [pid]是你的目标进程的pid

然后寻找以下成员。

utime％lu
stime％lu

man / proc @ http://linux.die.net/man/5/proc

Answer 3

试试这个：

    private float getCpuPer() { //for single process

    float cpuPer = 0;
    try {
        String[] cmd = {"top", "-n", "1"};
        Process process = Runtime.getRuntime().exec(cmd);
        BufferedReader stdInput = new BufferedReader(new
                InputStreamReader(process.getInputStream()));

        BufferedReader stdError = new BufferedReader(new
                InputStreamReader(process.getErrorStream()));

        // read the output from the command
        //System.out.println("Here is the standard output of the command:\n");
        String s = null;
        while ((s = stdInput.readLine()) != null) {
            if (s.contains("your process name")) {
                String [] arr = s.split(" ");
                for (int i = 0; i < arr.length; i++) {
                    if (arr[i].contains("%")) {
                        s = arr[i].replace("%", "");
                        cpuPer = Float.parseFloat(s);
                        break;
                    }
                }
                //System.out.println(s);
            }
        }

        // read any errors from the attempted command
        //System.out.println("Here is the standard error of the command (if any):\n");
        //while ((s = stdError.readLine()) != null) {
            //System.out.println(s);
        //}
    } catch (IOException e) {
        e.printStackTrace();
    }
    return cpuPer;
}

Answer 4

运行应用程序时，运行Android-sdk \ tools文件夹中的DDMS工具。您将在哪里获得有关所有运行过程的完整详细信息。如果您启用了调试功能的Android设备，那么您甚至可以通过将其连接到系统来调试设备。

如何通过应用程序获取内存使用和CPU使用？

4 个答案: