The Google Drive folder is hidden from many basic "Gallery" or "Music" apps. You need a proper file manager to see it.
for (File file : files) { if (file.getMimeType().equals("application/vnd.google-apps.folder")) { // It's a subfolder -> Create local dir -> Recurse File newLocalDir = new File(localDir, file.getName()); newLocalDir.mkdirs(); downloadFolder(file.getId(), newLocalDir); } else { // It's a file -> Download stream downloadFile(file.getId(), new File(localDir, file.getName())); } } } android google drive download folder