How to use Google API in flutter?

Question

I want to use Google Cloud Natural Language in my Flutter app,I got Google API package This works for flutter and theGoogle API_AUTH dependence is working for 0.2.1. How do I implement them ?

Answer 1

This worked for me:

Logging in using package google_sign_in and then get auth headers from it:

import 'package:google_sign_in/google_sign_in.dart'     show GoogleSignIn, GoogleSignInAccount;  import 'package:googleapis/people/v1.dart'     show ListConnectionsResponse, PeopleApi;  useGoogleApi() async {   final _googleSignIn = new GoogleSignIn(     scopes: [       'email',       'https://www.googleapis.com/auth/contacts.readonly',     ],   );    await _googleSignIn.signIn();    final authHeaders = _googleSignIn.currentUser.authHeaders;    // custom IOClient from below   final httpClient = GoogleHttpClient(authHeaders);     data = await PeopleApi(httpClient).people.connections.list(       'people/me',       personFields: 'names,addresses',       pageToken: nextPageToken,       pageSize: 100,   ); } 

This is a custom IOClient implementation that automatically adds the auth headers to each request. The googleapis call support passing a custom HTTP client to be used instead of the default (see above)

import 'package:http/io_client.dart'; import 'package:http/http.dart';  class GoogleHttpClient extends IOClient {   Map<String, String> _headers;    GoogleHttpClient(this._headers) : super();    @override   Future<StreamedResponse> send(BaseRequest request) =>       super.send(request..headers.addAll(_headers));    @override   Future<Response> head(Object url, {Map<String, String> headers}) =>       super.head(url, headers: headers..addAll(_headers));  }