我试图发送电子邮件并将用户输入数据从flutter应用程序保存到firebase。
我的代码可以:我已经创建了能够发送电子邮件的应用程序，但是我不得不将这些文本字段数据保存在Firebase中。
我已经在代码中实现了云Firestore，但出现了很多错误。
我的代码:
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter_email_sender/flutter_email_sender.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Home(),
);
}
}
class Home extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _HomeState();
}
}
class _HomeState extends State<Home> {
var _emailFormKey = GlobalKey<FormState>();
TextEditingController emailController = new TextEditingController();
TextEditingController nameController = new TextEditingController();
TextEditingController numberController = new TextEditingController();
@override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
resizeToAvoidBottomPadding: false,
appBar: AppBar(
title: Text("Email sending App"),
),
body: Form(
key: _emailFormKey,
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.only(top: 50.0, left: 15.0, right: 15.0),
child: TextFormField(
controller: emailController,
validator: (value) {
if (value.isEmpty) {
return "please enter emailid";
}
},
decoration: InputDecoration(
labelText: "Enter email id",
border: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.red,
width: 2.0,
))),
),
),
Container(
margin: EdgeInsets.only(top: 15.0, left: 15.0, right: 15.0),
child: TextFormField(
controller: numberController,
validator: (value) {
if (value.isEmpty) {
return "please enter number";
}
},
decoration: InputDecoration(
labelText: "Enter number",
border: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.red,
width: 2.0,
))),
),
),
Container(
margin: EdgeInsets.only(top: 15.0, left: 15.0, right: 15.0),
child: TextFormField(
controller: nameController,
validator: (value) {
if (value.isEmpty) {
return "please Enter name";
}
},
decoration: InputDecoration(
labelText: "Enter name",
border: OutlineInputBorder(
borderSide: BorderSide(
color: Colors.red,
width: 2.0,
))),
),
),
Container(
margin: EdgeInsets.only(top: 15.0),
child: RaisedButton(
child: Text("Send"),
onPressed: () {
if (_emailFormKey.currentState.validate()) {
sendMessage();
//function to send data in the firebase
sendToServer();
}
}),
)
],
),
),
);
}
void sendMessage() {
var PhoneNumber;
String Name;
String Emailid;
Email email;
setState(() {
Emailid = emailController.text;
Name = nameController.text;
PhoneNumber = numberController.text;
String messageBody = '$Name \n $PhoneNumber \n $Emailid';
if (Name.isNotEmpty && Emailid.isNotEmpty && PhoneNumber.isNotEmpty) {
email = Email(
body: messageBody,
subject: 'Email subject',
recipients: ['onlineproductsking1@gmail.com'],
);
send(email);
sendToServer() {
if (_emailFormKey.currentState.validate()) {
//No error in validator
_emailFormKey.currentState.save();
Firestore.instance.runTransaction((Transaction transaction) async {
CollectionReference reference =
Firestore.instance.collection('contact');
await reference.add({
"Name": "$Name",
"Phone Number": "$PhoneNumber",
"Email Id": "$Emailid"
});
});
// } else {
// // validation error
// setState(() {
// // _validate = true;
// });
// }
}
}
}
});
debugPrint('name -> $Name, number -> $PhoneNumber, emailid -> $Emailid');
}
void send(Email email) async {
await FlutterEmailSender.send(email);
}
}
Compiler message:
^
lib/contact_form.dart:107:23: Error: The method 'sendToServer' isn't defined for the class '_HomeState'.
- '_HomeState' is from 'package:pdf/contact_form.dart' ('lib/contact_form.dart').
Try correcting the name to the name of an existing method, or defining a method named 'sendToServer'.
sendToServer();
^^^^^^^^^^^^
lib/contact_form.dart:138:48: Error: 'Transaction' isn't a type.
Firestore.instance.runTransaction((Transaction transaction) async {
^^^^^^^^^^^
lib/contact_form.dart:139:15: Error: 'CollectionReference' isn't a type.
CollectionReference reference =
^^^^^^^^^^^^^^^^^^^
lib/contact_form.dart:138:13: Error: The getter 'Firestore' isn't defined for the class '_HomeState'.
- '_HomeState' is from 'package:pdf/contact_form.dart' ('lib/contact_form.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'Firestore'.
Firestore.instance.runTransaction((Transaction transaction) async {
^^^^^^^^^
lib/contact_form.dart:140:19: Error: The getter 'Firestore' isn't defined for the class '_HomeState'.
- '_HomeState' is from 'package:pdf/contact_form.dart' ('lib/contact_form.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'Firestore'.
Firestore.instance.collection('books');
^^^^^^^^^
请帮助我解决此问题，并提及我在哪里出错。
最佳答案
setState接受一个没有参数且不返回数据的voidCallback:
https://api.flutter.dev/flutter/widgets/State/setState.html
基本上:
setState(() {
});
()是回调的no参数，而{ //... }是回调中的代码。在回调中，您要添加方法sendToServer()的实现，而您不能这样做。sendToServer()是一个实例方法，它应该在sendMessage()或setState之外: void sendMessage() {
var PhoneNumber;
String Name;
String Emailid;
Email email;
setState(() {
Emailid = emailController.text;
Name = nameController.text;
PhoneNumber = numberController.text;
String messageBody = '$Name \n $PhoneNumber \n $Emailid';
if (Name.isNotEmpty && Emailid.isNotEmpty && PhoneNumber.isNotEmpty) {
email = Email(
body: messageBody,
subject: 'Email subject',
recipients: ['onlineproductsking1@gmail.com'],
);
send(email);
}
});
debugPrint('name -> $Name, number -> $PhoneNumber, emailid -> $Emailid');
}
sendToServer() {
if (_emailFormKey.currentState.validate()) {
//No error in validator
_emailFormKey.currentState.save();
Firestore.instance.runTransaction((Transaction transaction) async {
CollectionReference reference =
Firestore.instance.collection('contact');
await reference.add({
"Name": "$Name",
"Phone Number": "$PhoneNumber",
"Email Id": "$Emailid"
});
});
}
}
pubspec.yaml文件中添加以下依赖项: cloud_firestore: ^0.13.7
关于firebase - 无法从Firebase中的文本字段表单保存数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63102887/