public class GoogleDriveExample { public static void main(String[] args) throws Exception { // ...

// Download a file Drive drive = new Drive.Builder( GoogleNetHttpTransport.newTrustedTransport(), GsonFactory.getDefaultInstance(), credential ).build();

Here's an example of how to list files in Google Drive:

import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow; import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets; import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport; import com.google.api.client.json.gson.GsonFactory; import com.google.api.services.drive.Drive; import com.google.api.services.drive.DriveScopes;