private static class MountPoint {
    String mDescription;
    String mPath;
    boolean mIsExternal;
    boolean mIsMounted;
    long mMaxFileSize;
    long mFreeSpace;
    long mTotalSpace;
}

private final CopyOnWriteArrayList <MountPoint> mMountPathList = new CopyOnWriteArrayList<MountPoint>();
public void init(Context context) {
    mStorageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
    final String defaultPath = getDefaultPath();
    LogUtils.d(TAG, "init,defaultPath = " + defaultPath);
    if (!TextUtils.isEmpty(defaultPath)) {
      mRootPath = ROOT_PATH;
    }
    mMountPathList.clear();
    // check media availability to init mMountPathList
    StorageVolume[] storageVolumeList = mStorageManager.getVolumeList();
    if (storageVolumeList != null) {
      for (StorageVolume volume : storageVolumeList) {
        MountPoint mountPoint = new MountPoint();
        mountPoint.mDescription = volume.getDescription(context);
        mountPoint.mPath = volume.getPath();
        mountPoint.mIsMounted = isMounted(volume.getPath());
        mountPoint.mIsExternal = volume.isRemovable();
        mountPoint.mMaxFileSize = volume.getMaxFileSize();
        LogUtils.d(TAG, "init,description :" + mountPoint.mDescription + ",path : "
            + mountPoint.mPath + ",isMounted : " + mountPoint.mIsMounted
            + ",isExternal : " + mountPoint.mIsExternal + ", mMaxFileSize: " + mountPoint.mMaxFileSize);
        mMountPathList.add(mountPoint);
      }
    }
    IconManager.getInstance().init(context, defaultPath + SEPARATOR);
}

/**
* This method checks weather certain path is external mount path.
*
* @param path path which needs to be checked
* @return true for external mount path, and false for not external mount path
*/
public boolean isExternalMountPath(String path) {
    //LogUtils.d(TAG, "isExternalMountPath ,path =" + path);
    if (path == null) {
      return false;
    }
    for (MountPoint mountPoint : mMountPathList) {
      if (mountPoint.mIsExternal && mountPoint.mPath.equals(path)) {
        return true;
      }
    }
    return false;
}

public boolean isInternalMountPath(String path) {
    //LogUtils.d(TAG, "isInternalMountPath ,path =" + path);
    if (path == null) {
      return false;
    }
    for (MountPoint mountPoint : mMountPathList) {
      if (!mountPoint.mIsExternal && mountPoint.mPath.equals(path)) {
        return true;
      }
    }
    return false;
}