public StorageVolume[] getVolumeList() {
    if (mMountService == null) return new StorageVolume[0];
    try {
      Parcelable[] list = mMountService.getVolumeList();
      if (list == null) return new StorageVolume[0];
      int length = list.length;
      StorageVolume[] result = new StorageVolume[length];
      for (int i = 0; i < length; i++) {
        result[i] = (StorageVolume)list[i];
      }
      return result;
    } catch (RemoteException e) {
      Log.e(TAG, "Failed to get volume list", e);
      return null;
    }
  }

public class StorageInfo {
 public String path;
 public String state;
 public boolean isRemoveable;
 
 public StorageInfo(String path) {
 this.path = path;
 }
 
 public boolean isMounted() {
 return "mounted".equals(state);
 }
}

public static List listAvaliableStorage(Context context) {
    ArrayList storagges = new ArrayList();
    StorageManager storageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
    try {
      Class<?>[] paramClasses = {};
      Method getVolumeList = StorageManager.class.getMethod("getVolumeList", paramClasses);
      getVolumeList.setAccessible(true);
      Object[] params = {};
      Object[] invokes = (Object[]) getVolumeList.invoke(storageManager, params);
      if (invokes != null) {
        StorageInfo info = null;
        for (int i = 0; i < invokes.length; i++) {
          Object obj = invokes[i];
          Method getPath = obj.getClass().getMethod("getPath", new Class[0]);
          String path = (String) getPath.invoke(obj, new Object[0]);
          info = new StorageInfo(path);
          File file = new File(info.path);
          if ((file.exists()) && (file.isDirectory()) && (file.canWrite())) {
            Method isRemovable = obj.getClass().getMethod("isRemovable", new Class[0]);
            String state = null;
            try {
              Method getVolumeState = StorageManager.class.getMethod("getVolumeState", String.class);
              state = (String) getVolumeState.invoke(storageManager, info.path);
              info.state = state;
            } catch (Exception e) {
              e.printStackTrace();
            }
 
            if (info.isMounted()) {
              info.isRemoveable = ((Boolean) isRemovable.invoke(obj, new Object[0])).booleanValue();
              storagges.add(info);
            }
          }
        }
      }
    } catch (NoSuchMethodException e1) {
      e1.printStackTrace();
    } catch (IllegalArgumentException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      e.printStackTrace();
    }
    storagges.trimToSize();
 
    return storagges;
  }

Method getVolumeState = StorageManager.class.getMethod("getVolumeState", String.class);
              state = (String) getVolumeState.invoke(storageManager, info.path);
              info.state = state;