如何解决如何使用dio在flutter中成功响应时导航到不同的屏幕
我正在尝试使用 dio 在成功响应后导航到其他屏幕。但是我遇到了错误，并且在登录时仍然堆栈。
我仍然从颤振开始。
这是我的登录页面
import 'dart:ui';
import 'package:app/utils/api_provider.dart';
import 'package:flutter_signin_button/button_list.dart';
import 'package:flutter_signin_button/button_view.dart';
import 'package:app/utils/Strings.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:app/screens/signupscreen.dart';
import 'home_screen.dart';
class Loginscreen extends StatefulWidget {
@override
_LoginscreenState createState() => _LoginscreenState();
}
class _LoginscreenState extends State<Loginscreen> {
String loginUrl = Africapital.login_url;
String msgError = "";
TextEditingController _usernameee = new TextEditingController();
TextEditingController _password = new TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,body: SingleChildScrollView(
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [Colors.white,Colors.white],begin: Alignment.bottomLeft,end: Alignment.topLeft),),child: Center(
child: Column(
children: <Widget>[
SizedBox(
height: 50,new Container(
alignment: Alignment.center,height: 100,width: 100,margin: EdgeInsets.only(
left: 40.0,decoration: BoxDecoration(
borderRadius: BorderRadius.circular(100),color: Colors.white60,boxShadow: [
BoxShadow(color: Colors.white60,spreadRadius: 5),],image: DecorationImage(
image: AssetImage('assets/images/44.jpg'),fit: BoxFit.contain,SizedBox(
height: 15,Center(
child: Text(msgError,style: TextStyle(
color: Colors.red,fontWeight: FontWeight.bold,fontSize: 20)),SizedBox(
height: 5,Container(
alignment: Alignment(-0.90,0.90),margin: const EdgeInsets.only(left: 20.0,right: 20.0),child: Text(
'Sign in with your account',style: TextStyle(
color: Colors.black54,fontSize: 16,fontWeight: FontWeight.w500),SizedBox(
height: 20.0,Container(
alignment: Alignment.center,padding: const EdgeInsets.only(left: 1,right: 1),child: TextField(
controller: _usernameee,cursorColor: Colors.indigoAccent,style: TextStyle(color: Color(0xFF1a60be)),decoration: new InputDecoration(
contentPadding: const EdgeInsets.symmetric(vertical: 5.0),labelText: ' Email',focusedBorder: OutlineInputBorder(
borderSide:
BorderSide(color: Color(0xFF1a60be),width: 2.0),enabledBorder: OutlineInputBorder(
borderSide:
BorderSide(color: Colors.black38,width: 1.0),hintText: ' email@email.com',hintStyle: TextStyle(
fontSize: 15,letterSpacing: 1.5,color: Color(0xFF1a60be),fontWeight: FontWeight.w900),filled: true,hoverColor: Colors.black,focusColor: Colors.transparent,fillColor: Colors.white.withOpacity(0.3),border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white38),borderRadius: BorderRadius.circular(10),SizedBox(
height: 20,child: TextField(
controller: _password,obscureText: true,decoration: new InputDecoration(
labelText: ' Password',contentPadding: const EdgeInsets.symmetric(vertical: 5.0),hintText: ' ••••••••',hintStyle: TextStyle(
fontSize: 25,letterSpacing: 2.5,Row(
mainAxisAlignment: MainAxisAlignment.end,children: <Widget>[
GestureDetector(
onTap: () {},child: Container(
child: Text(
'Forgot Password?',style: TextStyle(
color: Colors.black,fontWeight: FontWeight.w700),SizedBox(
width: 40,)
],Padding(
padding: const EdgeInsets.only(left: 25,right: 25),child: ButtonTheme(
buttonColor: Color(0xFF3fc99c),minWidth: MediaQuery.of(context).size.width,height: 45,child: RaisedButton(
onPressed: () {
_doLogin(context);
},child: Text(
'Continue',style: TextStyle(color: Colors.white,fontSize: 22),shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5)),)),Align(
alignment: Alignment(-0.80,child: Text(
'Or Continue with',fontWeight: FontWeight.w800),Container(
width: MediaQuery.of(context).size.width,margin: const EdgeInsets.only(left: 25,child: SignInButton(
Buttons.Google,onPressed: () {},child: SignInButton(
Buttons.Facebook,SizedBox(
height: 25,Row(
mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[
Text(
"Don't Have an Account?",style: TextStyle(
color: Colors.black87,fontSize: 14,fontWeight: FontWeight.w400),SizedBox(
width: 10,GestureDetector(
onTap: () {
Navigator.push(context,MaterialPageRoute(builder: (ctx) => Signscreen()));
},child: Text(
'Sign up',style: TextStyle(
decoration: TextDecoration.underline,fontWeight: FontWeight.w800,fontSize: 18,color: Colors.black,SizedBox(
height: 40,)
],);
}
void _doLogin(BuildContext context) async {
String usernameee = _usernameee.text;
String password = _password.text;
ApiProvider apiService = new ApiProvider();
print("hello");
final loginresponse =
await apiService.getLogin(uname: usernameee,passcode: password);
if (loginresponse.response.data != 200) {
throw Exception("error");
} else {
navigateToSubPage(context);
}
}
Future navigateToSubPage(context) async {
Navigator.push(
context,MaterialPageRoute(builder: (context) => HomeScreen()));
}
}
这是我的 api_provider.dart
import 'dart:convert';
import 'package:dio/dio.dart';
import 'package:flutter_session/flutter_session.dart';
class ApiProvider {
Dio _dio;
String aToken = '';
final BaseOptions options = new BaseOptions(
baseUrl: 'https://sooo.co.ke/africanapp/',connectTimeout: 15000,receiveTimeout: 13000,);
static final ApiProvider _instance = ApiProvider._internal();
factory ApiProvider() => _instance;
ApiProvider._internal() {
_dio = Dio(options);
_dio.interceptors
.add(InterceptorsWrapper(onRequest: (Options options) async {
// to prevent other request enter this interceptor.
_dio.interceptors.requestLock.lock();
// We use a new Dio(to avoid dead lock) instance to request token.
//Set the cookie to headers
options.headers["cookie"] = aToken;
_dio.interceptors.requestLock.unlock();
return options; //continue
}));
}
// ignore: missing_return
Future<LoginApiResponse> getLogin({String passcode,String uname}) async {
final request = {"email": uname,"password": passcode};
FormData formData = FormData.fromMap({
'email': uname,'password': passcode,});
print(request);
try {
final response = await _dio.post('/',data: formData);
//getting cookies from response
String jsonsDataString = response.data.toString();
final jsonData = jsonDecode(jsonsDataString);
final cookies = response.headers.map['set-cookie'];
print(cookies);
print(response.data);
var message = jsonData['msg'];
var usrid = jsonData['uid'];
var name = jsonData['username'];
var mail = jsonData['email'];
var images = jsonData['profile'];
if (message == "welcomeback") {
await FlutterSession().set('username',usrid);
await FlutterSession().set('username',name);
await FlutterSession().set('email',mail);
await FlutterSession().set('image',images);
print(message + " dan status : " + message);
}
//print(response.headers.toString());
if (response.statusCode == 200) {
final authToken = cookies[1].split(';')[0]; // server sending cookie
// authToken in local storage,pass5. in further api calls.
aToken =
authToken; // global variable to refresh current api calls to add cookie.
print(authToken);
} else {
// If that response was not OK,throw an error.
throw Exception('Failed to load post');
}
return LoginApiResponse(jsonData);
} catch (e) {
print('Error: $e');
}
}
}
class LoginApiResponse {
final Response response;
LoginApiResponse(this.response);
}
谁能检查一下并告诉我我的问题出在哪里。提前致谢。
我真的很需要这个帮助，我很想尽快完成我的项目。
请帮忙。
解决方法
final jsonData = jsonDecode(jsonsDataString);
...
return LoginApiResponse(jsonData);
...
if (loginresponse.response.data != 200)
解码后jsonData只有数据部分，没有statusCode，所以在_doLogin()的loginresponse中你不会有状态部分，因此您不会导航到其他页面。
,好的，我知道你想在这里实现什么。 所以基本上你想在响应成功时导航到另一个屏幕。 所以，你的情况如下：
<tr *ngFor="let tenant of lstTenants | search:searchTerm:hasFinanacialDebt:hasntFinanacialDebt">
<td>{{tenant.name}}</td>
<td>{{tenant.phoneNumber}}</td>
<td>{{tenant.address}}</td>
<td>{{tenant.financialDebt}}</td>
</tr>
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