public static List<String> getFilesAllName(String path) {

        File file=new File(path);

        File[] files=file.listFiles();

        if (files == null){Log.e("error","空目录");return null;}

        List<String> s = new ArrayList<>();

        for(int i =0;i<files.length;i++){

            s.add(files[i].getAbsolutePath());

        }

        return s;

    }