GoogleApiClient.blockingConnect() does not work with GOOGLE_SIGN_IN_API

Question

I have a SyncAdapter (code does not run on the UI thread) that writes to the app folder on Google Drive. This was working fine with the GoogleApiClient without Google Sign-In, but I am trying to move to GoogleApiClient with Google Sign-In.

The working code without Google Sign-In:

    mGoogleApiClient = new GoogleApiClient.Builder(context)
            .setAccountName(accountName)
            .addApi(Drive.API)
            .addScope(Drive.SCOPE_APPFOLDER)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
    mGoogleApiClient.blockingConnect();

Now that I have moved to using Google Sign-In it no longer works. The following code is what I am trying to use:

    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestScopes(new Scope(Scopes.DRIVE_APPFOLDER))
            .build();
    mGoogleApiClient = new GoogleApiClient.Builder(mApplication)
            .addApi(Drive.API)
            .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
    mGoogleApiClient.blockingConnect();

My program falls over with the following error on the call to blockingConnect():

java.lang.IllegalStateException: Cannot use SIGN_IN_MODE_REQUIRED with GOOGLE_SIGN_IN_API. Use connect(SIGN_IN_MODE_OPTIONAL) instead.

Is there a way to perform a blockingConnect() with the Google Sign-In API?

Note that I perform an initial Sign-In on the UI thread before the SyncAdapter attempts the above code.

Answer 1

This is the only way I can get the API to work from my SyncAdapter - the new API refuses to work with blockingConnect():

    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestScopes(new Scope(Scopes.DRIVE_APPFOLDER))
            .build();
    mGoogleApiClient = new GoogleApiClient.Builder(mApplication)
            .addApi(Drive.API)
            .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
            .build();
    long start = System.currentTimeMillis();
    mGoogleApiClient.connect(GoogleApiClient.SIGN_IN_MODE_OPTIONAL);
    while (mGoogleApiClient.isConnecting() && System.currentTimeMillis() - start < 5000) {
        try {
            Thread.sleep(250, 0);
        } catch (InterruptedException e) {
        }
    }
    if (mGoogleApiClient.isConnected()) {
        try {
            // Do stuff with Google Drive.
        } finally {
            mGoogleApiClient.disconnect();
        }
    }