android获取cpu核数

因为Android本质上是linux系统,所以关系硬件相关的信息实际上是用文件表示的

CPU相关信息放在 /sys/devices/system/cpu/ 这个路径下,

要知道cpu的核数只需要查看这个路径中的文件即可

如果CPU是双核的,则 /sys/devices/system/cpu/路径下有两个子文件夹cpu0和cpu1

如果CPU是四核的,则 /sys/devices/system/cpu/路径下有四个子文件夹cpu0和cpu1和cpu2和cpu3

以此类推

用JAVA代码来获取CPU核数:

这个是抄来的

public static int getNumberOfCPUCores() {  
    if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1) {  
        // Gingerbread doesn't support giving a single application access to both cores, but a  
         // handful of devices (Atrix 4G and Droid X2 for example) were released with a dual-core  
        // chipset and Gingerbread; that can let an app in the background run without impacting  
        // the foreground application. But for our purposes, it makes them single core.  
        return 1;  //上面的意思就是2.3以前不支持多核,有些特殊的设备有双核...不考虑,就当单核!!
    }  
    int cores;  
    try {  
        cores = new File("/sys/devices/system/cpu/").listFiles(CPU_FILTER).length;  
    } catch (SecurityException e) {  
        cores = DEVICEINFO_UNKNOWN;   //这个常量得自己约定
    } catch (NullPointerException e) {  
        cores = DEVICEINFO_UNKNOWN;  
    }  
    return cores;  
}  

private static final FileFilter CPU_FILTER = new FileFilter() {  
    @Override  
    public boolean accept(File pathname) { 
        String path = pathname.getName();  
        //regex is slow, so checking char by char.  
        if (path.startsWith("cpu")) {  
            for (int i = 3; i < path.length(); i++) {  
                if (path.charAt(i) < '0' || path.charAt(i) > '9') {  
                    return false;  
                }  
            }  
            return true;  
        }  
        return false;  
    }  
};