android – 如何通过应用程序获取内存使用和CPU使用？

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;
}

最佳答案

Context context = this.getApplicationContext();
ActivityManager mgr = (ActivityManager)context.getSystemService(ACTIVITY_SERVICE);
Listterator 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,复杂化确定应用程序内存使用情况.
> dalvikPrivateDirty是java将释放的内存
虚拟机,如果进程被终止
> 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
共享内存的一部分检查pss> = private原因
只使用一小部分共享内存是这样的
所有负责任的应用程序共享内存使用的合理性

此值用于估计应用程序的内存负载.

总数是dalvik,native和其他的总和.