J2ME遍历手持机所有根路径找出并RMS存储可用空间最大路径

 /**
  * 获取路径
  * 遍历手持机所有跟路径，找出可用空间最大的路径作为返回值， 
  * 并存入RMS，下次启动程序直接从RMS读取路径
  * 
  * @return
  */
 public String getPhonePath() {
  String phonePath = "";
  try {
   RecordStore rootPathRms = RecordStore.openRecordStore("phonePath", true);
   int num = rootPathRms.getNumRecords();
   if (num > 0) {
    byte[] b = rootPathRms.getRecord(1);
    phonePath = new String(b, "utf-8");
   } else if (phonePath.equals("") || phonePath == null) {
    String[] roots = new String[10];
    Enumeration e = FileSystemRegistry.listRoots();
    int i = 0;
    while (e.hasMoreElements()) {
     String root = (String) e.nextElement();
     roots[i] = root;
     i++;
    }
    long[] rootSizes = new long[i];
    for (int j = 0; j < i; j++) {
     FileConnection fc;
     try {
      fc = (FileConnection) Connector.open("file:///"
        + roots[j]);
      rootSizes[j] = fc.availableSize();
     } catch (IOException e1) {
      e1.printStackTrace();
     }
    }
    int index = 0;
    long temp = 0;
    for (int h = 0; h < rootSizes.length; h++) {
     if (rootSizes[h] > temp) {
      temp = rootSizes[h];
      index = h;
     } else
      continue;
    }
    phonePath = roots[index];
    rootPathRms.addRecord(phonePath.getBytes(), 0,
      phonePath.getBytes().length);
   }
  } catch (RecordStoreFullException e) {
   e.printStackTrace();
  } catch (RecordStoreNotFoundException e) {
   e.printStackTrace();
  } catch (RecordStoreException e) {
   e.printStackTrace();
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  } finally {
   try {
    rootPathRms.closeRecordStore();
   } catch (RecordStoreNotOpenException e) {
    e.printStackTrace();
   } catch (RecordStoreException e) {
    e.printStackTrace();
   }
  }
  return phonePath;
 }