列出从主页第二页收到的论点

Question

我是Flutter的新手，正在创建一个notes应用程序。我想把新注释的标题和文本从"；新音符"；页面转到所有其他笔记所在的主页。

我想将标题和文本传递到第一页，在那里我可以使用"列表"视图随着笔记数量的增长创建已保存笔记的列表。我做错了什么？这是我的主页代码：

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:notes/newnote.dart';
void main() {
runApp(MaterialApp(home: MyApp(), initialRoute: 'main.dart', routes: {
'/home': (context) => MyApp(),
'/newnote': (context) => NewNote(),
}));
}

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Notes',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: FirstPage(),
);
}
}
int x = 0;
class FirstPage extends StatefulWidget {
String title ;
String text ;
FirstPage({Key key, @required this.title,@required this.text}) : super(key: key);
void pri() {print(title);}
@override
_MyAppState createState() => _MyAppState();
}
Map data = {};
class _MyAppState extends State<FirstPage> {
@override
Widget build(BuildContext context) {
//final dat args = ModalRoute.of(context).settings.arguments;
return Scaffold(
appBar: AppBar(
title: Text(
"Note-It!",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.black,
),
body: Column(
//
children: <Widget>[
Padding(
padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 19.0),
),
Expanded(
child: ListView.builder(
itemCount: x,
itemBuilder: (context, index) {
return ListTile(
title: Text(widget.title),
// onTap: () {
//   Navigator.push( context,MaterialPageRoute( builder: (context) =>
//   DetailScreen(notedata: datas[index])));
// }
);
}),
),
Align(
alignment: Alignment.bottomRight,
child: FloatingActionButton(
child: Icon(Icons.add),
backgroundColor: Colors.black,
onPressed: () {
setState(() {
Navigator.push(context, new MaterialPageRoute(
builder: (context) =>
new NewNote(t1: null, t2: null)
));
});
}),
),
],
),
);
}
}

这是我的"；新音符"；页面

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:notes/main.dart';
void main() {
runApp(MaterialApp(home: NewNote()));
}
final fromController1 = TextEditingController();
final fromController2 = TextEditingController();
var instance;
class NewNote extends StatelessWidget {
String t1; //requesting data here
String t2;
NewNote({Key key, @required this.t1,@required this.t2}) : super(key: key);
// final String d;
//
// NewNote({
//   Key key,
//   @required this.d,
// }) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("New Note"),
backgroundColor: Colors.black,
),
body: SingleChildScrollView(
child: Padding(
padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 19.0),
child: SingleChildScrollView(
child: Column(children: <Widget>[
TextField(
controller: fromController1,
decoration: InputDecoration(
border: OutlineInputBorder(), labelText: "Title"),
style: TextStyle(fontSize: 28.0),
),
Padding(padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 0.0)),
TextField(
controller: fromController2,
decoration: InputDecoration(
border: OutlineInputBorder(), labelText: "Text"),
style: TextStyle(fontSize: 20.0),
maxLines: null,
),
Padding(padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 0.0)),
Align(
alignment: Alignment.bottomCenter,
child: FloatingActionButton.extended(
label: Text("Save Note"),
icon: Icon(Icons.save),
backgroundColor: Colors.black,
onPressed: () {
x++;
t1 = fromController1.text;
t2 = fromController2.text;
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => MyApp(), //pass your title and text to NewNote
),
).then((value){
FirstPage(title: t1, text: t2);
});
},
),
),
]),
),
),
),
);
}
}

Answer 1

您已经在新注释页面的第一页中传递了标题和字符串。你只是没有用正确的语法把它显示在屏幕上。更改此

title: Text(
"Note-It!",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),

至

title: Text(
this.widget.title,
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),