My specific issue is

when I call

driveService.files().export(fileId, "text/csv").executeMediaAndDownloadTo(outputStream);

From my App I get

11-22 00:35:02.489 : com.google.api.client.http.HttpResponseException: 401 Unauthorized

11-22 00:35:02.490 : {

11-22 00:35:02.491 :  "error": {

11-22 00:35:02.491 :   "errors": [

11-22 00:35:02.491 :    {

11-22 00:35:02.491 :     "domain": "global",

11-22 00:35:02.491 :     "reason": "authError",

11-22 00:35:02.491 :     "message": "Invalid Credentials",

11-22 00:35:02.492 :     "locationType": "header",

11-22 00:35:02.492 :     "location": "Authorization"

11-22 00:35:02.492 :    }

11-22 00:35:02.492 :   ],

11-22 00:35:02.492 :   "code": 401,

11-22 00:35:02.492 :   "message": "Invalid Credentials"

11-22 00:35:02.493 :  }

11-22 00:35:02.493 : }

When I use APIs Explorer on
Services / Drive API v3 / drive.files.export
I get the data I want.

My Questions are:

1. How can I fix this issue.




2. As I get a google account when I sign in... is that not enough to know the user/password I've entered and which is registered in the smartphone ...Am I right?




3. Which are the minimal set of permissions I need to set in servers side in order to have permissions




4. How can I check which is the specific permission issue that does not allow to download the google sheet from google drive?

Thanks a lot for any response.

My Java code snippets related to this issue (sign in process)

In server side

My credentials for the app are:

• Web client


• Android Client

I use the Client id of "Web client"
If I use the clientId of Android client I don't get the idToken

Enabled Library API:

• Google Drive API
  Authorize requests using Oauth 2.0 - On drive.files.export


• Google Sheet API

In Android App

    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)

            .requestIdToken(this.googleClientId)

            .requestEmail()

            .build();



    ...



    mGoogleSignInClient = GoogleSignIn.getClient(this, gso);



    ...

    Intent signInIntent = mGoogleSignInClient.getSignInIntent();

    startActivityForResult(signInIntent, RC_SIGN_IN);

    ...



public void onActivityResult(int requestCode, int resultCode, Intent data) {

    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RC_SIGN_IN) {

        validateGoogleUser(data);

    }

}



...

    Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(this.dataIntent);

...

    GoogleSignInAccount account = task.getResult(ApiException.class);

...

    // It returns my account with id / idToken / mail / names / ... more





    And then... I continue

In the method I try to download this is the code

        //TODO: move this to a service and to a dao

        final HttpTransport HTTP_TRANSPORT  = AndroidHttp.newCompatibleTransport();;

        GoogleCredential credential = new GoogleCredential().setAccessToken(accessToken);







        Drive driveService = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)

                .setApplicationName(applicationName)

                .build();

        String fileId = idSheet;

        //TODO: Check how to check progress and limit size of download or cancel the operation after n seconds

        OutputStream outputStream = new ByteArrayOutputStream();

        driveService.files().export(fileId, "text/csv")

                .executeMediaAndDownloadTo(outputStream);

NOTE : I don't use
- GoogleIdTokenVerifier.verify

nor I know for what it is ... as I already get my account info.

I've found a solution of the problem. The rights of the server side were ok. But in this project I've forked is the combination of Google Sign in and Google drive connection I need to download or use Google Drive files from my Android app

https://github.com/jguastav/android-GoogleDriveSample