Android编程实现获得内存剩余大小与总大小的方法

public class memInfo {
 // 获得可用的内存
 public static long getmem_UNUSED(Context mContext) {
  long MEM_UNUSED;
  // 得到ActivityManager
  ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);  // 创建ActivityManager.MemoryInfo对象   ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
  am.getMemoryInfo(mi);
  // 取得剩余的内存空间   MEM_UNUSED = mi.availMem / 1024;
  return MEM_UNUSED;
 }
 // 获得总内存
 public static long getmem_TOLAL() {
  long mTotal;
  // /proc/meminfo读出的内核信息进行解释
  String path = "/proc/meminfo";
  String content = null;
  BufferedReader br = null;
  try {
   br = new BufferedReader(new FileReader(path), 8);
   String line;
   if ((line = br.readLine()) != null) {
    content = line;
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   if (br != null) {
    try {
     br.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }
  // beginIndex
  int begin = content.indexOf(':');
  // endIndex
  int end = content.indexOf('k');
  // 截取字符串信息  content = content.substring(begin + 1, end).trim();
  mTotal = Integer.parseInt(content);
  return mTotal;
 }
}