How to upload files using the Google Drive API?

I'm trying to upload a file using the Google Drive api on Android

https://github.com/googlesamples/google-services/tree/master/android/signin/app/src/main/java/com/google/samples/quickstart/signin

I signed up to SignInActivityWithDrive.java in the link above.

But there is no example of uploading a file, downloading a file

I want to know how to upload and download files

Thank you

Solution

You can find basic examples of uploading and downloading in the docs.

Uploading

You can send upload requests in any of the following ways:

Simple upload: uploadType=media. For quick transfer of a small file (5 MB or less). To perform a simple upload, refer to Performing a Simple Upload.

Multipart upload: uploadType=multipart. For quick transfer of a small file (5 MB or less) and metadata describing the file, all in a single request. To perform a multipart upload, refer to Performing a Multipart Upload.

Resumable upload: uploadType=resumable. For more reliable transfer, especially important with large files. Resumable uploads are a good choice for most applications, since they also work for small files at the cost of one additional HTTP request per upload. To perform a resumable upload, refer to Performing a Resumable Upload.

The following example shows how to upload an image using the client libraries:

File fileMetadata = new File();
fileMetadata.setName("photo.jpg");
java.io.File filePath = new java.io.File("files/photo.jpg");
FileContent mediaContent = new FileContent("image/jpeg", filePath);
File file = driveService.files().create(fileMetadata, mediaContent)
    .setFields("id")
    .execute();
System.out.println("File ID: " + file.getId());

Downloading

Depending on the type of download you'd like to perform — a file, a Google Document, or a content link — you'll use one of the following URLs:

Download a file — files.get with alt=media file resource

Download and export a Google Doc — files.export

Link a user to a file — webContentLink from the file resource

An example of a basic download is:

String fileId = "0BwwA4oUTeiV1UVNwOHItT0xfa2M";
OutputStream outputStream = new ByteArrayOutputStream();
driveService.files().get(fileId)
    .executeMediaAndDownloadTo(outputStream);