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; }}