Android 之文件夹排序（基于名称、最近修改时间、大小）

基于名称：

/**
     * 按文件名排序
     * @param filePath
     */
    public static ArrayList orderByName(String filePath) {
        ArrayList FileNameList = new ArrayList();
        File file = new File(filePath);
        File[] files = file.listFiles();
        List fileList = Arrays.asList(files);
        Collections.sort(fileList, new Comparator() {
            @Override
            public int compare(File o1, File o2) {
                if (o1.isDirectory() && o2.isFile())
                    return -1;
                if (o1.isFile() && o2.isDirectory())
                    return 1;
                return o1.getName().compareTo(o2.getName());
            }
        });
        for (File file1 : files) {
            if (file1.isDirectory()) {
                FileNameList.add(file1.getName());
            }
        }
        return FileNameList;
    }

基于最近修改时间：

/**
     * 按文件修改时间排序
     * @param filePath
     */
    public static ArrayList orderByDate(String filePath) {
        ArrayList FileNameList = new ArrayList();
        File file = new File(filePath);
        File[] files = file.listFiles();
        Arrays.sort(files, new Comparator() {
            public int compare(File f1, File f2) {
                long diff = f1.lastModified() - f2.lastModified();
                if (diff > 0)
                    return 1;
                else if (diff == 0)
                    return 0;
                else
                    return -1;// 如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
            }

            public boolean equals(Object obj) {
                return true;
            }

        });

        for (File file1 : files) {
            if (file1.isDirectory()) {
                FileNameList.add(file1.getName());
            }
        }
        return FileNameList;
    }

基于大小：

/**
     * 按文件大小排序
     * @param filePath
     */
    public static ArrayList orderBySize(String filePath) {
        ArrayList FileNameList = new ArrayList();
        File file = new File(filePath);
        File[] files = file.listFiles();
        List fileList = Arrays.asList(files);
        Collections.sort(fileList, new Comparator() {
            public int compare(File f1, File f2) {
                long s1 = getFolderSize(f1);
                long s2 = getFolderSize(f2);

                long diff = s1 - s2;
                if (diff > 0)
                    return 1;
                else if (diff == 0)
                    return 0;
                else
                    return -1;// 如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
            }

            public boolean equals(Object obj) {
                return true;
            }
        });

        for (File file1 : files) {
            if (file1.isDirectory()) {
                FileNameList.add(file1.getName());
            }
        }
        return FileNameList;
    }

    /**
     * 获取文件夹大小
     * @param file File实例
     * @return long
     */
    public static long getFolderSize(File file) {

        long size = 0;
        try {
            java.io.File[] fileList = file.listFiles();
            for (int i = 0; i < fileList.length; i++) {
                if (fileList[i].isDirectory()) {
                    size = size + getFolderSize(fileList[i]);
                } else {
                    size = size + fileList[i].length();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return size;
    }