cherry pick 3472701f

     * @return String, the last part after separator of path or null if invalid path has been provided

     */

    public static String getFileNameFromPath(String path) {

        Log.i(TAG, "getFileNameFromPath("+path+")");

        try{

            String[] splittedString = path.split(FileUtils.PATH_SEPARATOR);

            return splittedString[splittedString.length - 1];