FileItem

public class FileItem implements Comparable<FileItem> {

    private String mFilePath;
    private String mFileName;
    private String mSize;

    /**
     * 创建时间
     */
    private String mDate;

    private Type mType;

    public FileItem(@NonNull String path, String name, String size, String date) {
        this.mFilePath = path;
        this.mFileName = name;
        this.mSize = size;
        this.mDate = date;
    }

    public String getFilePath() {
        return mFilePath;
    }

    public void setFilePath(String mFilePath) {
        this.mFilePath = mFilePath;
    }

    public String getFileName() {
        return mFileName;
    }

    public void setFileName(String mFileName) {
        this.mFileName = mFileName;
    }

    public String getFileSize() {
        NumberFormat ddf1 = NumberFormat.getNumberInstance();
        ddf1.setMaximumFractionDigits(2);

        String sizeDisplay;
        long size = Long.valueOf(mSize);
        if (size > 1048576.0) {
            double result = size / 1048576.0;
            sizeDisplay = ddf1.format(result) + "M";
        } else if (size > 1024) {
            double result = size / 1024;
            sizeDisplay = ddf1.format(result) + "K";
        } else {
            sizeDisplay = ddf1.format(size) + "B";
        }
        return sizeDisplay;
    }

    public long getLongFileSize() {
        return Long.valueOf(mSize);
    }

    public String getDate() {
        return mDate;
    }

    public Type getType() {
        return mType;
    }

    public void setType(Type type) {
        this.mType = type;
    }

    @Override
    public int compareTo(@NonNull FileItem fileItem) {
        return (int) (Long.valueOf(fileItem.getDate()) - Long.valueOf(mDate));
    }

    public enum Type {
        Image(0), Video(1);

        private final int code;

        Type(int code) {
            this.code = code;
        }

        public int getCode() {
            return code;
        }
    }

    @Override
    public String toString() {
        if (mType == Type.Image) {
            return "{mediaType: image, " + "mediaPath: " + mFilePath + "}";
        } else {
            return "{mediaType: video, " + "mediaPath: " + mFilePath + "}";
        }
    }
}

图片:

private boolean getPhotos() {
        Uri imageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        ContentResolver contentResolver = getContext().getContentResolver();
        String[] projection = new String[]{
                MediaStore.Images.ImageColumns.DATA, MediaStore.Images.ImageColumns.DISPLAY_NAME,
                MediaStore.Images.ImageColumns.SIZE, MediaStore.Images.ImageColumns.DATE_ADDED
        };
        Cursor cursor = contentResolver.query(imageUri, projection, null, null,
                MediaStore.Images.Media.DATE_ADDED + " desc");

        if (cursor == null) {
            return false;
        }
        if (cursor.getCount() != 0) {
            while (cursor.moveToNext()) {
                String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA));
                String fileName =
                        cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME));
                String size = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.SIZE));
                String date = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATE_ADDED));

                FileItem item = new FileItem(path, fileName, size, date);
                item.setType(FileItem.Type.Image);
                mMedias.add(item);
            }
        }
        cursor.close();
        return true;
    }

视频

private boolean getVideos() {
        Uri videoUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
        ContentResolver cr = getContext().getContentResolver();
        String[] projection = new String[]{
                MediaStore.Video.VideoColumns.DATA, MediaStore.Video.VideoColumns.DURATION,
                MediaStore.Video.VideoColumns.DISPLAY_NAME, MediaStore.Video.VideoColumns.DATE_ADDED
        };

        Cursor cursor = cr.query(videoUri, projection, null, null, null);
        if (cursor == null) {
            return false;
        }
        if (cursor.getCount() != 0) {
            while (cursor.moveToNext()) {
                String path = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DATA));
                String name = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DISPLAY_NAME));
                String date = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DATE_ADDED));
                long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media.DURATION));

                VideoItem item = new VideoItem(path, name, null, date, duration);
                item.setType(FileItem.Type.Video);
                mMedias.add(item);
            }
        }
        cursor.close();
        return true;
    }