android获取手机cpu并判断是单核还是多核

/** 
* Gets the number of cores available in this device, across all processors. 
* Requires: Ability to peruse the filesystem at "/sys/devices/system/cpu" 
* @return The number of cores, or 1 if failed to get result 
*/ 
private int getNumCores() { 
//Private Class to display only CPU devices in the directory listing 
class CpuFilter implements FileFilter { 
@Override 
public boolean accept(File pathname) { 
//Check if filename is "cpu", followed by a single digit number 
if(Pattern.matches("cpu[0-9]", pathname.getName())) { 
return true; 
} 
return false; 
} 
} 

try { 
//Get directory containing CPU info 
File dir = new File("/sys/devices/system/cpu/"); 
//Filter to only list the devices we care about 
File[] files = dir.listFiles(new CpuFilter()); 
//Return the number of cores (virtual CPU devices) 
return files.length; 
} catch(Exception e) { 
//Default to return 1 core 
return 1; 
} 
}