getAllPhotos.java

final private static String FILE_SLASH = "file:///";
public static ArrayList<Photo> getAllPhotos(Context context) {
    ArrayList<Photo> listOfPhotos = new ArrayList<>();
    String[] projection = {
            MediaStore.Images.ImageColumns.DATA,
            MediaStore.Images.ImageColumns.DATE_TAKEN};
    Cursor cursor = MediaStore.Images.Media.query(
            context.getContentResolver(),
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            projection,
            null, null, MediaStore.Images.ImageColumns.DATE_TAKEN
    );
    while (cursor.moveToNext()) {
        String path = FILE_SLASH + cursor.getString(cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA));
        Long date = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.ImageColumns.DATE_TAKEN));
        Photo photo = new Photo(path, date);
        listOfPhotos.add(photo);
    }
    cursor.close();
    return listOfPhotos;
}