有人可以帮我解决这个我正在尝试处理我的颤振应用程序的问题吗？这是我得到的错误：
E/flutter ( 3345): <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
E/flutter ( 3345): ^
E/flutter ( 3345):
E/flutter ( 3345): #0 _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1404:5)
E/flutter ( 3345): #1 _ChunkedJsonParser.parseNumber (dart:convert-patch/convert_patch.dart:1271:9)
E/flutter ( 3345): #2 _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:936:22)
E/flutter ( 3345): #3 _parseJson (dart:convert-patch/convert_patch.dart:40:10)
E/flutter ( 3345): #4 JsonDecoder.convert (dart:convert/json.dart:505:36)
E/flutter ( 3345): #5 JsonCodec.decode (dart:convert/json.dart:156:41)
E/flutter ( 3345): #6 _RecuperaPasswordState.resetPassword (package:abbiamounposto1/RecuperaPassword.dart:49:21)
E/flutter ( 3345): <asynchronous suspension>
E/flutter ( 3345): #7 _RecuperaPasswordState.build.<anonymous closure> (package:abbiamounposto1/RecuperaPassword.dart:127:40)
E/flutter ( 3345): #8 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
E/flutter ( 3345): #9 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1111:38)
E/flutter ( 3345): #10 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
E/flutter ( 3345): #11 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
E/flutter ( 3345): #12 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
E/flutter ( 3345): #13 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:259:7)
E/flutter ( 3345): #14 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
E/flutter ( 3345): #15 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:362:20)
E/flutter ( 3345): #16 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22)
E/flutter ( 3345): #17 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11)
E/flutter ( 3345): #18 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7)
E/flutter ( 3345): #19 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
E/flutter ( 3345): #20 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7)
E/flutter ( 3345): #21 _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter ( 3345): #22 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter ( 3345): #23 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter ( 3345): #24 _invoke1 (dart:ui/hooks.dart:265:10)
E/flutter ( 3345): #25 _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)
E/flutter ( 3345):
代码如下：
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:http/http.dart' as http;
import 'package:mailer/mailer.dart';
import 'package:mailer/smtp_server.dart';
class RecuperaPassword extends StatefulWidget{
@override
_RecuperaPasswordState createState() => new _RecuperaPasswordState();
}
class _RecuperaPasswordState extends State<RecuperaPassword> {
TextEditingController user = TextEditingController();
bool verifyButton = false;
String verifyLink;
Future checkUser()async{
var response = await http.post('https://abbiamounposto.altervista.org/flutter-forget-pass-recover-tutorial/check.php',
body: {
"Matricola": user.text,
}
);
var link = json.decode(response.body);
if (link=="INVALIDUSER"){
Fluttertoast.showToast(msg: 'Questo utente non è nel nostro database',
gravity: ToastGravity.BOTTOM, timeInSecForIosWeb: 3);
}else{
setState(() {
verifyLink = link;
verifyButton = true;
});
Fluttertoast.showToast(msg: 'Clicka sul Pulsante di Verifica ',
gravity: ToastGravity.BOTTOM, timeInSecForIosWeb: 3);
}
print(link);
}
int newPass = 0;
Future resetPassword() async{
var response = await http.post(verifyLink);
var link = json.decode(response.body);
setState(() {
newPass = link;
});
print(link);
Fluttertoast.showToast(msg: 'La tua Password è stata resettata : $newPass',
gravity: ToastGravity.BOTTOM, timeInSecForIosWeb: 3);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView( child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Container(
margin: EdgeInsets.only(right: 70.0, left: 70.0, top:20),
padding: EdgeInsets.only(top: 5.0, left: 20.0, right: 20.0),
child: Stack(
children:<Widget> [
LogoImageAsset(),
],
),
),
Container(
child: Stack(
children:<Widget> [
Container(
alignment: Alignment.bottomCenter,
child: Text(
'RECUPERA PASSWORD',
style: GoogleFonts.montserrat(
textStyle: TextStyle(color:Color(0xFF182D54)),
fontSize: 20.0,
fontWeight: FontWeight.w800,)
),
),
Container(
padding: EdgeInsets.only(top: 70.0, left: 20.0, right: 20.0),
child: Column(
children: <Widget> [
TextField(
controller: user,
decoration: InputDecoration(
labelText: 'Matricola Utente',
labelStyle: GoogleFonts.montserrat(
textStyle: TextStyle(color: Color(0xFF182D54)),
fontSize: 17.0,
fontWeight: FontWeight.w700,),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Color(0xFF182D54)))),
),
SizedBox(height: 50.0),
Container(
height: 40.0,
child: MaterialButton(
onPressed: (){
checkUser();
},
color: Color(0xFF182D54),
elevation: 7.0,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20.0)
),
child: Text(
'RESET PASSWORD',
style: GoogleFonts.montserrat(
textStyle: TextStyle(color: Colors.white),
fontSize: 20.0,
fontWeight: FontWeight.w700,)
)),
),
verifyButton ? MaterialButton(
onPressed: (){
resetPassword();
},
child: Text('VERIFICA',)
): Container(),
SizedBox( height: 40.0),
Container(
height: 40.0,
child: MaterialButton(
onPressed: () {
Navigator.pushNamed(context, '/homepage');
},
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20.0)),
color: Color(0xFF182D54),
elevation: 7.0,
child: Center(
child: Text(
'INDIETRO',
style: GoogleFonts.montserrat(
textStyle: TextStyle(color: Colors.white),
fontSize: 20.0,
fontWeight: FontWeight.w700,))),
)),
],
)
),
],
)
)
] )
)
);
}
}
这是我制作重置密码页面所需的代码，它也链接到一个php文件。我只上传了我认为可能导致错误的部分代码...请我真的需要解决这个问题！
另外，有人知道如何将 Flutter 应用程序与在线数据库连接起来吗？或者有没有人有教程给我看，我们正在用flutter开发这个新应用，但对这个世界来说也是非常新的，所以如果你能帮助我们，我们将不胜感激！！！