Access YouTube brand account using GoogleSignInApi - youtube-data-api

Question

I am following this guide: https://developers.google.com/identity/sign-in/android/
Which prompts me for my Google user and I login ok, I can access the youtube data api.
However I want it to prompt me to choose my linked brand account instead. Is this possible? I had it working from a nodejs app but it doesn't seem supported in this case.

Answer 1

Turns out you can't. Just not supported at this time.
Instead you need to go via https://github.com/openid/AppAuth-Android/ using just the youtube scope, this prompts for your channels/brand accounts correctly.
Then to use the result with the youtube api I did this in the AppAuth TokenActivity:
/**
* Define a global instance of the HTTP transport.
*/
public static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
/**
* Define a global instance of the JSON factory.
*/
public static final JsonFactory JSON_FACTORY = new JacksonFactory();
private YouTube mYoutube;
#MainThread
private void fetchUserInfo(String accessToken, String idToken, AuthorizationException ex) {
if (ex != null) {
Log.e(TAG, "Token refresh failed when fetching user info");
mUserInfoJson.set(null);
runOnUiThread(this::displayAuthorized);
return;
}
mYoutube = new YouTube.Builder(TokenActivity.HTTP_TRANSPORT, TokenActivity.JSON_FACTORY, new HttpRequestInitializer() {
#Override
public void initialize(HttpRequest httpRequest) throws IOException {
httpRequest.getHeaders().setAuthorization("Bearer " + accessToken);
}
})
.build();
mExecutor.submit(() -> {
try {
YouTube.LiveBroadcasts.List list = mYoutube.liveBroadcasts()
.list("id, snippet, contentDetails, status")
.setMine(true);
Log.i(TAG, "List to string " + list.toString());
LiveBroadcastListResponse response = list
.execute();
JSONObject obj = new JSONObject();
obj.put("name", response.getItems().get(0).getSnippet().getTitle());
mUserInfoJson.set(obj);
} catch (IOException e) {
Log.e(TAG, "Failed to construct user info endpoint URL", e);
} catch (JSONException e) {
Log.e(TAG, "Failed to set name", e);
// e.printStackTrace();
}
runOnUiThread(this::displayAuthorized);
});