android---获取cpu核心个数

android获取cpu核心数代码如下
 1 private int getNumCores()
 2     {
 3         // Private Class to display only CPU devices in the directory listing
 4         class CpuFilter implements FileFilter
 5         {
 6             @Override
 7             public boolean accept(File pathname)
 8             {
 9                 // Check if filename is "cpu", followed by a single digit number
10                 if (Pattern.matches("cpu[0-9]", pathname.getName()))
11                 {
12                     return true;
13                 }
14                 return false;
15             }
16         }
17 
18         try
19         {
20             // Get directory containing CPU info
21             File dir = new File("/sys/devices/system/cpu/");
22             // Filter to only list the devices we care about
23             File[] files = dir.listFiles(new CpuFilter());
24             // Return the number of cores (virtual CPU devices)
25             return files.length;
26         } catch (Exception e)
27         {
28             // Default to return 1 core
29             return 1;
30         }
31     }