app.dart

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:http/http.dart' as http;
import 'select_regions.dart';
import 'dart:convert';
import 'package:provider/provider.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // return MaterialApp(home: HomePage());
    return MaterialApp(
      home: ChangeNotifierProvider<StateGetTestData>(
      builder: (_) => StateGetTestData(),
      child: HomePage()
    
    ),
    
    );
    
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(appBar: AppBar(), body: MyContainer());
  }
}

class MyContainer extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return  Column(  
          // crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            GetTestData(),      
            SelectRegions()
          ],
        
        );
  }
}

class GetTestData extends StatefulWidget {
  @override
  StateGetTestData createState() => StateGetTestData();
}

class StateGetTestData extends State<GetTestData> with ChangeNotifier {
  String my_json = "";
  String url = "https://api.ru .... ";
  String access_token = "";

  sendServerRequest() async {
    var response =
        await http.post(url, headers: {"Accept": "application/json"});
    debugPrint("=======> ${response.statusCode}");
    if (response.statusCode == 200) {
      setState(() {
        access_token = json.decode(response.body)['access_token']; 
        notifyListeners();
      });
    } else {
      debugPrint("---> $response.statusCode");
    }
  }

  Widget build(BuildContext context) {
    return Container(
        child: Row(
      children: <Widget>[
        Flexible(
            child: Column(
          children: <Widget>[
            Text("answer from server: $my_json"),
          ],
        )),
        Column(
          children: <Widget>[
            RaisedButton(
              child: Text("Get Data From Server"),
              onPressed: sendServerRequest,
            )
          ],
        )
      ],
    ));
  }
}




class SelectRegions extends StatefulWidget {
  @override
  _SelectRegionsState createState() => _SelectRegionsState();
}

class _SelectRegionsState extends State<SelectRegions> {

  List _myActivities;
  String _myActivitiesResult;
  final formKey = new GlobalKey<FormState>();

  @override
  void initState() {
    super.initState();
    _myActivities = [];
    _myActivitiesResult = '';
  }

  _saveForm() {
    var form = formKey.currentState;
    if (form.validate()) {
      form.save();
      setState(() {
        _myActivitiesResult = _myActivities.toString();
      });
    }
  }

  @override
  Widget build(BuildContext context) {
  
  final StateGetTestData stateGetTestData = Provider.of<StateGetTestData>(context);

    return Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              Text("sssssss11ssss ${stateGetTestData.access_token}"),
              Container(
                padding: EdgeInsets.all(16),
                child: MultiSelectFormField(
                  autovalidate: false,
                  titleText: 'My workouts',
                  validator: (value) {
                    if (value == null || value.length == 0) {
                      return 'Please select one or more options';
                    }
                  },
                  dataSource: [
                    {
                      "display": "Running",
                      "value": "Running",
                    },
                    {
                      "display": "Climbing",
                      "value": "Climbing",
                    },
                  ],
                  textField: 'display',
                  valueField: 'value',
                  okButtonLabel: 'OK',
                  cancelButtonLabel: 'CANCEL',
                  // required: true,
                  hintText: 'Please choose one or more',
                  value: _myActivities,
                  onSaved: (value) {
                    if (value == null) return;
                    setState(() {
                      _myActivities = value;
                    });
                  },
                ),
              ),
              Container(
                padding: EdgeInsets.all(8),                
                child: RaisedButton(
                  child: Text('Save'),
                  onPressed: _saveForm,
                ),
              ),
              Container(
                padding: EdgeInsets.all(16),
                child: Text(_myActivitiesResult),
              )
            ],
          );
        

    // );
  }
}