Screenshot :
BLoC Pattern Event using Rest API Call in Flutter
main.dart
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'blocs/country/country_bloc.dart';
import 'blocs/user/user_bloc.dart';
import 'screens/pages/home_page.dart';
import 'service/di/dependency_injection.dart';
import 'utils/vars.dart';
void main() {
Injector.configure(Flavor.Network);
runApp(StartApp());
}
class StartApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
SystemChrome.setSystemUIOverlayStyle(
SystemUiOverlayStyle.dark.copyWith(
statusBarColor: Colors.transparent,
statusBarIconBrightness: Brightness.light),
);
return BlocProvider(
builder: (context) => UserBloc(),
child: BlocProvider(
builder: (context) => CountryBloc(),
child: MaterialApp(
theme: ThemeData(
//buttonColor: Colors.white,
brightness: Brightness.light,
accentColor: Colors.orange,
primaryColor: Colors.orangeAccent,
primarySwatch: Colors.orange,
fontFamily: quickFont),
initialRoute: '/',
debugShowCheckedModeBanner: false,
routes: <String, WidgetBuilder>{
'/': (context) => HomePage()
})));
}
}
pubspec.yaml
name: flutter_app
description: A new Flutter application.
version: 1.0.0+1
environment:
sdk: ">=2.1.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
cupertino_icons:
shared_preferences:
intl:
font_awesome_flutter:
flutter_bloc:
provider:
rxdart:
http:
dev_dependencies:
flutter_test:
sdk: flutter
flutter:
uses-material-design: true
fonts:
- family: Quicksand
fonts:
- asset: assets/fonts/quicksand_medium.ttf
style: normal
- asset: assets/fonts/quicksand_bold.otf
weight: 700
- family: Raleway
fonts:
- asset: assets/fonts/raleway_regular.ttf
style: normal
- asset: assets/fonts/raleway_medium.ttf
Models Package
country.dart
class CountryResponse {
final String name;
CountryResponse({this.name});
CountryResponse copyWith(Map<String, dynamic> json) {
return CountryResponse(
name: json["name"] ?? this.name);
}
CountryResponse.fromJson(Map<String, dynamic> json)
: name = json["name"];
}
login.dart
class LoginResponse {
final double id;
final String firstName, lastName, mobile, username, code;
LoginResponse({
this.id,
this.firstName,
this.lastName,
this.username,
this.code,
this.mobile,
});
LoginResponse copyWith(Map<String, dynamic> json) {
return LoginResponse(
id: json["ID"] ?? this.id,
firstName: json["FNAME"] ?? this.firstName,
lastName: json["LNAME"] ?? this.lastName,
username: json["RETAILERNAME"] ?? this.username,
code: json["RETAILERCODE"] ?? this.code,
mobile: json["MOBILENO"] ?? this.mobile);
}
LoginResponse.fromJson(Map<String, dynamic> json)
: id = json["ID"],
firstName = json["FNAME"],
lastName = json["LNAME"],
username = json["RETAILERNAME"],
code = json["RETAILERCODE"],
mobile = json["MOBILENO"];
}
Utils Package
validator.dart
class Validator {
static String validateMobile(String value) {
String pattern = r'(^[0-9]*$)';
RegExp regExp = new RegExp(pattern);
if (value.replaceAll(" ", "").isEmpty) {
return 'Mobile is required';
} else if (value.replaceAll(" ", "").length != 10) {
return 'Mobile number must 10 digits';
} else if (!regExp.hasMatch(value.replaceAll(" ", ""))) {
return 'Mobile number must be digits';
}
return null;
}
static String validUserName(String value) {
String pattern = r'(^[a-zA-Z ]*$)';
RegExp regExp = new RegExp(pattern);
if (value.isEmpty) {
return 'Username is required';
} else if (!regExp.hasMatch(value)) {
return 'Username must be a-z and A-Z';
}
return null;
}
static String validateEmail(String value) {
String pattern =
r'^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$';
RegExp regExp = new RegExp(pattern);
if (value.isEmpty) {
return 'Email is required';
} else if (!regExp.hasMatch(value)) {
return 'Invalid email';
} else {
return null;
}
}
static String validatePassword(String value) {
if (value.isEmpty) {
return 'Password is required';
} else if (value.length < 4) {
return 'Password must be at least 4 characters';
}
return null;
}
static String validateConfirmPassword(String value) {
if (value.isEmpty) {
return 'Confirm password is required';
} else if (value.length < 4) {
return 'Confirm password must be at least 4 characters';
}
return null;
}
static bool validationEqual(String currentValue, String checkValue) {
if (currentValue == checkValue) {
return true;
} else {
return false;
}
}
static String address(String value) {
if (value.isEmpty) {
return 'Address is required';
}
return null;
}
static String state(String value) {
if (value.isEmpty) {
return 'State is required';
}
return null;
}
static String flatNoHouseNo(String value) {
if (value.isEmpty) {
return 'Flat No. / House No. is required';
}
return null;
}
static String city(String value) {
if (value.isEmpty) {
return 'City is required';
}
return null;
}
}
vars.dart
String appName = "MileStone"; String quickFont = 'Quicksand'; String ralewayFont = 'Raleway'; String quickBoldFont = 'quicksand_bold.otf'; String quickNormalFont = 'quicksand_book.otf'; String quickLightFont = 'quicksand_light.otf'; String homeRoute = '/homepage'; int ok200 = 200;
Screens Package
- pages Package
- widgets Package
-Pages
home_page.dart
import 'package:flutter/material.dart';
import 'package:flutter_app/blocs/country/country_state.dart';
import 'package:flutter_app/blocs/country/country_bloc.dart';
import 'package:flutter_app/models/country.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
class HomePage extends StatefulWidget {
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<HomePage> {
CountryBloc countryBloc;
@override
void initState() {
super.initState();
countryBloc = BlocProvider.of<CountryBloc>(context);
countryBloc.callCountry();
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
title: Text('Country List'),
),
body: Container(
child: BlocBuilder(
bloc: countryBloc,
builder: (context, CountryState state) {
return state.loading? Center(
child: CircularProgressIndicator()
) : ListView.builder(
padding: EdgeInsets.only(top: 1.0),
physics: BouncingScrollPhysics(),
itemCount: state.country.length,
itemBuilder: (BuildContext context, int index) {
CountryResponse promoter = state.country[index];
return Material(
child: Ink(
color: Colors.white,
child: ListTile(
title: Text(promoter.name,
style: TextStyle(
color: Colors.black87,
fontSize: 17)),
leading: Container(
width: 40,
height: 40,
child: Align(
alignment: Alignment.center,
child: Text(
promoter.name
.substring(0, 1),
style: TextStyle(
color: Colors.black54,
fontSize: 20))),
decoration: BoxDecoration(
color: Colors.grey.withOpacity(0.1),
borderRadius:
BorderRadius.circular(40.0))),
onTap: () {})));
});
})));
}
}
-widgets
common_dialogs.dart
import 'package:flutter/material.dart';
import 'package:flutter_app/utils/vars.dart';
/*toast(String msg) {
Fluttertoast.showToast(
msg: msg,
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.BOTTOM,
backgroundColor: Colors.white,
textColor: Colors.black);
}*/
showSuccess(BuildContext context, String message, IconData icon) {
showDialog(
context: context,
builder: (context) => Center(
child: Material(
borderRadius: BorderRadius.circular(8.0),
color: Colors.black,
elevation: 5.0,
child: Padding(
padding: const EdgeInsets.all(32.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Icon(
icon,
color: Colors.green,
),
SizedBox(
height: 10.0,
),
Text(
message,
style: TextStyle(
fontFamily: '$ralewayFont', color: Colors.white),
)
],
),
),
),
));
}
showProgress(BuildContext context) {
showDialog(
context: context,
barrierDismissible: false,
builder: (context) => Center(
child: CircularProgressIndicator()
));
}
hideProgress(BuildContext context) {
Navigator.pop(context);
}
Bloc Package
- country Package
- user Package
- viewmodel Package
- common_state.dart
Bloc Package
common_state.dart
abstract class CommonState {
bool loading = false;
bool loaded = false;
Map error;
CommonState({
this.loading,
this.loaded,
this.error,
});
Map<String, dynamic> toMap() => {
'loading': loading,
'loaded': loaded,
'error': error,
};
}
-country Package
country_bloc.dart
import 'dart:async';
import 'package:bloc/bloc.dart';
import 'package:flutter_app/blocs/viewmodel/api_provider.dart';
import 'package:flutter_app/blocs/viewmodel/country_data.dart';
import 'package:flutter_app/models/country.dart';
import 'package:flutter_app/utils/vars.dart';
import 'country_event.dart';
import 'country_state.dart';
class CountryBloc extends Bloc<CountryEvent, CountryState> {
final ApiProvider apiProvider = ApiProvider();
void callCountry() {
dispatch(GetCountry());
}
@override
CountryState get initialState => CountryState.initial();
@override
Stream<CountryState> mapEventToState(CountryEvent event) async* {
if (event is GetCountry) {
yield currentState.copyWith(loading: true);
try {
await apiProvider.getCountry();
List<CountryResponse> brandList;
if (apiProvider.apiResult != null) {
brandList = apiProvider.apiResult.response;
if (brandList.isNotEmpty) {
yield currentState.copyWith(
loading: false,
country: brandList
);
} else {
yield currentState.copyWith(
error: {"error": 'Data not found'},
loaded: false,
loading: false,
);
}
}
} catch (e) {
yield currentState.copyWith(
error: {"error": "Error, Something bad happened."},
loaded: false,
loading: false,
);
}
}
}
}
country_event.dart
abstract class CountryEvent {}
class GetCountry extends CountryEvent {}
country_state.dart
import 'package:flutter/cupertino.dart';
import 'package:flutter_app/models/country.dart';
class CountryState {
final List<CountryResponse> country;
final bool loading;
final Map error;
CountryState({
@required this.loading,
@required this.error,
this.country,
});
factory CountryState.initial() {
return CountryState(
loading: false,
error: null,
country: const [],
);
}
CountryState copyWith({
bool loading,
bool loaded,
Map error,
List<CountryResponse> country
}) {
return CountryState(
loading: loading ?? this.loading,
error: error ?? this.error,
country: country ?? this.country,
);
}
}
-user Package
user_bloc.dart
import 'dart:async';
import 'package:bloc/bloc.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'user_event.dart';
import 'user_state.dart';
class UserBloc extends Bloc<UserEvent, UserState> {
SharedPreferences pref;
void saveUserName(username) {
dispatch(SaveUserName(username: username));
}
void saveId(id) {
dispatch(SaveId(id: id));
}
void saveAuthToken(token) {
dispatch(SaveToken(token: token));
}
void saveEmail(email) {
dispatch(SaveEmail(email: email));
}
void saveMobile(mobile) {
dispatch(SaveMobile(mobile: mobile));
}
void getLoginDetails() {
dispatch(GetLoginDetails());
}
@override
UserState get initialState => UserState.initial();
@override
Stream<UserState> mapEventToState(
UserEvent event,
) async* {
if (event is SaveUserName) {
pref.setString("username", event.username);
}
if (event is SaveId) {
pref = await SharedPreferences.getInstance();
pref.setString("id", event.id);
}
if (event is SaveEmail) {
pref = await SharedPreferences.getInstance();
pref.setString("email", event.email);
}
if (event is SaveToken) {
pref = await SharedPreferences.getInstance();
pref.setString("token", event.token);
}
if (event is RemoveToken) {
pref = await SharedPreferences.getInstance();
pref.remove("token");
}
if (event is SaveMobile) {
pref = await SharedPreferences.getInstance();
pref.setString("mobile", event.mobile);
}
//GET LOGIN DETAILS
if (event is GetLoginDetails) {
pref = await SharedPreferences.getInstance();
yield currentState.copyWith(mobile: pref.getString('mobile'), userName: pref.getString('username'));
}
}
}
user_event.dart
abstract class UserEvent {}
class GetLoginDetails extends UserEvent {}
class SaveUserName extends UserEvent {
final String username;
SaveUserName({this.username});
}
class SaveId extends UserEvent {
final String id;
SaveId({this.id});
}
class SaveToken extends UserEvent {
final String token;
SaveToken({this.token});
}
class RemoveToken extends UserEvent {
final String token;
RemoveToken({this.token});
}
class SaveEmail extends UserEvent {
final String email;
SaveEmail({this.email});
}
class SaveMobile extends UserEvent {
final String mobile;
SaveMobile({this.mobile});
}
user_state.dart
import 'package:flutter/material.dart';
import 'package:meta/meta.dart';
class UserState {
final bool loading, loaded;
final Map error;
final String userName, mobile;
UserState({
@required this.loading,
@required this.loaded,
@required this.error,
@required this.userName,
@required this.mobile,
});
factory UserState.initial() {
return UserState(
loading: false,
loaded: false,
error: null,
userName: null,
mobile: null,
);
}
UserState copyWith({
bool loading,
bool loaded,
Map error,
String userName,
String mobile,
}) {
return UserState(
loading: loading ?? this.loading,
loaded: loaded ?? this.loaded,
error: error ?? this.error,
userName: userName ?? this.userName,
mobile: mobile ?? this.mobile);
}
}
-viewmodel Package
api_provider.dart
import 'dart:async';
import 'package:flutter_app/models/country.dart';
import 'package:flutter_app/service/abstract/api_service.dart';
import 'package:flutter_app/service/di/dependency_injection.dart';
import 'package:flutter_app/service/network_service_response.dart';
class ApiProvider {
NetworkServiceResponse apiResult;
APIService apiService = new Injector().flavor;
Future<Null> getCountry() async {
NetworkServiceResponse<List<CountryResponse>> result =
await apiService.country();
this.apiResult = result;
}
}
country_data.dart
import 'package:flutter_app/models/country.dart';
class CountryViewModel {
List<CountryResponse> promoterItems;
CountryViewModel({this.promoterItems});
countryList() => <CountryResponse>[
CountryResponse(name: 'India'),
];
}
service Package
- abstract Package
- di Package
- mock Package
- network Package
- network_service_response.dart
- network_type.dart
- restclient.dart
service Package
network_service_response.dart
class NetworkServiceResponse<T> {
T response;
int responseCode;
NetworkServiceResponse({this.response, this.responseCode});
}
class MappedNetworkServiceResponse<T> {
dynamic mappedResult;
NetworkServiceResponse<T> networkServiceResponse;
MappedNetworkServiceResponse(
{this.mappedResult, this.networkServiceResponse});
}
network_type.dart
import 'package:flutter_app/service/restclient.dart';
abstract class NetworkType {
RestClient rest;
NetworkType(this.rest);
}
restclient.dart
import 'dart:async';
import 'package:flutter_app/utils/vars.dart';
import 'package:http/http.dart' as http;
import 'network_service_response.dart';
class RestClient {
Future<MappedNetworkServiceResponse<T>> get<T>(String url, {Map headers}) async{
try {
var response = await http.get(url, headers: headers);
return processResponse<T>(response);
}
catch(e) {
return new MappedNetworkServiceResponse<T>(
networkServiceResponse: new NetworkServiceResponse<T>(
responseCode: 0));
}
}
Future<MappedNetworkServiceResponse<T>> post<T>(String url, {Map headers, body, encoding}) async{
try {
var response = await http.post(url, headers: headers, body: body, encoding: encoding);
return processResponse<T>(response);
}
catch(e) {
return new MappedNetworkServiceResponse<T>(
networkServiceResponse: new NetworkServiceResponse<T>(
responseCode: 0));
}
}
MappedNetworkServiceResponse<T> processResponse<T>(http.Response response) {
if ((response.statusCode > ok200)) {
return new MappedNetworkServiceResponse<T>(
networkServiceResponse: new NetworkServiceResponse<T>(
responseCode: response.statusCode));
} else {
return new MappedNetworkServiceResponse<T>(
mappedResult: response.body,
networkServiceResponse:
new NetworkServiceResponse<T>(responseCode: response.statusCode));
}
}
}
-abstract Package
api_service.dart
import 'dart:async';
import 'package:flutter_app/models/country.dart';
import 'package:flutter_app/models/login.dart';
import '../network_service_response.dart';
abstract class APIService {
Future<NetworkServiceResponse<List<CountryResponse>>> country();
}
-di Package
dependency_injection.dart
import 'package:flutter_app/service/abstract/api_service.dart';
import 'package:flutter_app/service/mock/mock_service.dart';
import 'package:flutter_app/service/network/network_service.dart';
import 'package:flutter_app/service/restclient.dart';
enum Flavor {Testing, Network}
//Simple DI
class Injector {
static final Injector _singleton = new Injector._internal();
static Flavor _flavor;
static void configure(Flavor flavor) async {
_flavor = flavor;
}
factory Injector() => _singleton;
Injector._internal();
APIService get flavor {
switch (_flavor) {
case Flavor.Testing:
return MockService();
default:
return NetworkService(new RestClient());
}
}
}
-mock Package
mock_service.dart
import 'dart:async';
import 'package:flutter_app/models/country.dart';
import 'package:flutter_app/models/login.dart';
import 'package:flutter_app/service/abstract/api_service.dart';
import 'package:flutter_app/service/network_service_response.dart';
import 'package:flutter_app/utils/vars.dart';
class MockService implements APIService {
@override
Future<NetworkServiceResponse<LoginResponse>> login(
String phoneNumber, String password) async {
await Future.delayed(Duration(seconds: 2));
return Future.value(NetworkServiceResponse(
responseCode: ok200,
response: LoginResponse(
)));
}
@override
Future<NetworkServiceResponse<List<CountryResponse>>> country() {
return null;
}
}
-network Package
network_service.dart
import 'dart:async';
import 'dart:convert';
import 'package:flutter_app/models/country.dart';
import 'package:flutter_app/models/login.dart';
import 'package:flutter_app/service/abstract/api_service.dart';
import '../network_service_response.dart';
import '../network_type.dart';
import '../restclient.dart';
class NetworkService extends NetworkType implements APIService {
static final _baseURL = 'https://restcountries.eu/rest/v2/';
static final _loginUrl = '';
final _countryUrl = _baseURL + 'all';
Map<String, String> headers = {
"Content-Type": "application/x-www-form-urlencoded"
};
NetworkService(RestClient rest) : super(rest);
@override
Future<NetworkServiceResponse<LoginResponse>> login(String phoneNumber,
String password) async {
var result = await rest.get<LoginResponse>(
'$_loginUrl?MobileNo=$phoneNumber&Password=$password&EmailId=""');
if (result.mappedResult != null) {
var res = LoginResponse.fromJson(json.decode(result.mappedResult));
return new NetworkServiceResponse(
response: res,
responseCode: result.networkServiceResponse.responseCode);
}
return new NetworkServiceResponse(
responseCode: result.networkServiceResponse.responseCode);
}
@override
Future<NetworkServiceResponse<List<CountryResponse>>> country() async{
var result = await rest.get<CountryResponse>('$_countryUrl');
if (result.networkServiceResponse.responseCode == 200) {
List<CountryResponse> list = (json.decode(result.mappedResult) as List)
.map((data) => new CountryResponse.fromJson(data))
.toList();
return new NetworkServiceResponse(
response: list,
responseCode: result.networkServiceResponse.responseCode
);
}
return new NetworkServiceResponse(
responseCode: result.networkServiceResponse.responseCode);
}
}
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