/**
  * 6.0获取外置sdcard和U盘路径，并区分
  * @param mContext
  * @param keyword SD = "内部存储"; EXT = "SD卡"; USB = "U盘"
  * @return
  */
 public static String getStoragePath(Context mContext,String keyword) {
  String targetpath = "";
  StorageManager mStorageManager = (StorageManager) mContext
    .getSystemService(Context.STORAGE_SERVICE);
  Class<?> storageVolumeClazz = null;
  try {
   storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");
   
   Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");
   
   Method getPath = storageVolumeClazz.getMethod("getPath");
     
   Object result = getVolumeList.invoke(mStorageManager);
   
   final int length = Array.getLength(result);
   
   Method getUserLabel = storageVolumeClazz.getMethod("getUserLabel");
   
   
   for (int i = 0; i < length; i++) {
    
    Object storageVolumeElement = Array.get(result, i);
    
    String userLabel = (String) getUserLabel.invoke(storageVolumeElement);
    
    String path = (String) getPath.invoke(storageVolumeElement);
    
    if(userLabel.contains(keyword)){
     targetpath = path;
    }

   }
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  } catch (InvocationTargetException e) {
   e.printStackTrace();
  } catch (NoSuchMethodException e) {
   e.printStackTrace();
  } catch (IllegalAccessException e) {
   e.printStackTrace();
  }
  return targetpath ;
 }