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I want when the user logs in, even if the application is still logged in. I am using an own api made in Nodejs. Through my researches I saw that you can do this using the plugin Sharedpreferences. The problem is I can’t implement it in my code.
Just below are the login_bloc.Dart codes and login_screen.Dart
import 'dart:async';
import 'package:bloc_pattern/bloc_pattern.dart';
import 'package:localizamed_app/validators/login_validator.dart';
import 'package:rxdart/rxdart.dart';
import 'package:http/http.dart' as http;
//import 'dart:convert';
//estados do login
enum LoginState {IDLE, CARREGANDO, SUCESSO, FALHA}
class LoginBloc extends BlocBase with LoginValidators{
//controladores
final _emailController = BehaviorSubject<String>();
final _senhaController = BehaviorSubject<String>();
final _stateController = BehaviorSubject<LoginState>();
Stream<String> get outEmail => _emailController.stream.transform(validaEmail);
Stream<String> get outSenha => _senhaController.stream.transform(validaSenha);
Stream<LoginState> get outState => _stateController.stream;
Stream<bool> get outSubmitValid => Observable.combineLatest2(
outEmail, outSenha, (a, b) => true
);
Function(String) get changeEmail => _emailController.sink.add;
Function(String) get changePassword => _senhaController.sink.add;
//Login com a API
Future<void> login() async{
final email = _emailController.value;
final senha = _senhaController.value;
_stateController.add(LoginState.CARREGANDO);
String url = "http://192.168.0.200:8081/login";
Map<String, String> headers = {"Accept": "application/json"};
try {
http.Response response = await http.post(url,
headers: headers,
body: {
"email": email,
"senha": senha
});
if(response.statusCode == 201){
_stateController.add(LoginState.SUCESSO);
} else{
_stateController.add(LoginState.FALHA);
}
} catch (erro){
print(_emailController);
return _stateController.add(LoginState.FALHA);
}
}
@override
void dispose() {
_emailController.close();
_senhaController.close();
_stateController.close();
}
}
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:localizamed_app/blocs/login_bloc.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:localizamed_app/screens/home_screen.dart';
import 'package:outline_material_icons/outline_material_icons.dart';
//import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
//import 'package:passwordfield/passwordfield.dart';
class LoginScreen extends StatefulWidget {
@override
LoginScreenState createState() => LoginScreenState();
final Stream<String> stream;
LoginScreen({this.stream});
}
class LoginScreenState extends State<LoginScreen> {
final _loginBloc = LoginBloc();
bool invisible;
@override
void initState() {
super.initState();
//estados de acordo com o que é retornado do Bloc -> API -> Banco
_loginBloc.outState.listen((state) {
switch (state) {
case LoginState.SUCESSO:
Navigator.of(context).pushReplacement(
MaterialPageRoute(builder: (context) => HomeScreen()));
break;
case LoginState.FALHA:
showDialog(
context: context,
builder: (context) => AlertDialog(
title: Text("Erro"),
content: Text(
"Sinto muito, mas seu E-mail/Senha estão incorretos!"),
));
break;
case LoginState.CARREGANDO:
case LoginState.IDLE:
}
});
invisible = true;
}
@override
void dispose() {
_loginBloc.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
var mediaQuery = MediaQuery.of(context);
var size = mediaQuery.size;
return Scaffold(
body: StreamBuilder<LoginState>(
stream: _loginBloc.outState,
initialData: LoginState.IDLE,
builder: (context, snapshot) {
switch (snapshot.data) {
case LoginState.CARREGANDO:
return Center(
child: CircularProgressIndicator(
valueColor: AlwaysStoppedAnimation(
Color.fromARGB(255, 23, 29, 255)),
),
);
case LoginState.FALHA:
case LoginState.SUCESSO:
case LoginState.IDLE:
return SafeArea(
child: Container(
width: size.width,
height: size.height,
child: SingleChildScrollView(
child: Column(
children: <Widget>[
Padding(
padding: EdgeInsets.only(
left: size.width / 3.1,
top: size.height / 60),
child: Row(
children: <Widget>[
Text("LocalizaMed",
style: TextStyle(
fontSize: size.width / 20,
)),
Image(
image: AssetImage('images/pin.png'),
width: size.width / 20,
height: size.height / 20,
),
],
),
),
SizedBox(
height: size.height / 15,
),
//label de BEM-VINDO
Padding(
padding: EdgeInsets.only(
bottom: size.height / 30,
top: size.height / 30,
right: size.width / 2,
left: size.width / 15),
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
Text(
"Bem",
style: TextStyle(
fontSize: size.width / 8,
),
),
Row(
children: <Widget>[
Text(
"Vindo",
style: TextStyle(
fontSize: size.width / 8,
),
),
Text(
".",
style: TextStyle(
fontSize: size.width / 8,
color: Theme.of(context)
.primaryColor),
),
],
)
],
)),
//campo de email
Padding(
padding: EdgeInsets.only(
left: size.width / 12,
right: size.width / 20,
top: 0),
child: Column(
children: <Widget>[
StreamBuilder<String>(
stream: _loginBloc.outEmail,
builder: (context, snapshot) {
return TextFormField(
onChanged: _loginBloc.changeEmail,
decoration: InputDecoration(
errorText: snapshot.hasError
? snapshot.error
: null,
labelText: "E-mail"),
);
}),
GestureDetector(
child: StreamBuilder<String>(
stream: _loginBloc.outSenha,
builder: (context, snapshot) {
return TextFormField(
onChanged:
_loginBloc.changePassword,
obscureText: invisible,
decoration: InputDecoration(
errorText: snapshot.hasError
? snapshot.error
: null,
labelText: 'Senha',
suffixIcon: IconButton(
icon: Icon(
invisible
? Icons
.visibility_off
: Icons.visibility,
size: 20.0,
),
onPressed: () {
setState(() {
invisible =
!invisible;
});
},
)),
);
}),
),
//botão de ESQUECER A SENHA
Container(
alignment: Alignment.centerRight,
child: FlatButton(
onPressed: () {},
child: Text(
"Esqueceu a senha?",
style: TextStyle(
color: Theme.of(context)
.primaryColor,
fontSize: size.width / 25),
),
),
),
SizedBox(
height: size.height / 50,
),
//botão de LOGIN
StreamBuilder<bool>(
stream: _loginBloc.outSubmitValid,
builder: (context, snapshot) {
return RaisedButton(
padding: EdgeInsets.symmetric(
vertical: size.height / 55,
horizontal:
size.width / 3.29),
color: Color.fromARGB(
255, 23, 29, 255),
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(
23)),
onPressed: snapshot.hasData
? _loginBloc.login
: null,
disabledColor: Colors.blue[300],
child: Text("Login",
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.white,
fontSize:
size.width / 25,
fontWeight:
FontWeight.bold)));
}),
SizedBox(
height: size.height / 50,
),
//botão de LOGAR PELO FACEBOOK
Container(
width: size.width / 1.4,
child: RaisedButton(
padding: EdgeInsets.symmetric(
vertical: size.height / 55,
horizontal: size.width / 8.4),
color: Colors.white,
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(23),
side: BorderSide(
color: Colors.black,
width: 2)),
onPressed: () {},
child: Row(
children: <Widget>[
Image(
image: AssetImage(
'images/facebook_logo1.png'),
width: 15,
height: 15,
),
Text(
"Logar pelo Facebook",
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.black,
fontSize: size.width / 28,
fontWeight:
FontWeight.bold),
),
],
),
),
),
SizedBox(
height: size.height / 20,
),
//Botão de se CADASTRAR
Container(
child: Center(
child: Row(
mainAxisAlignment:
MainAxisAlignment.center,
children: <Widget>[
Text(
"Não tem uma conta?",
style: TextStyle(
fontSize: size.width / 25),
),
SizedBox(
width: 1,
),
FlatButton(
padding: EdgeInsets.all(0),
onPressed: () {},
child: Text("Cadastre-se",
style: TextStyle(
color: Theme.of(context)
.primaryColor,
fontSize:
size.width / 25)),
)
],
),
),
),
],
)),
],
),
),
)
);
}
}));
}
}
Can someone help me? Thanks in advance ^^