I'm confused with flutter, when I want to read arguments from statefulwidget (initstate) and access it into widget build, the variable is still null. how to read it properly? my code is bellow :
import 'package:flutter/material.dart';
import 'package:caritokoonline_v2/components/ResultForm.dart';
import 'package:caritokoonline_v2/podo/SearchBarangRequest.dart';
class ResultBarangActivity extends StatefulWidget {
SearchBarangRequest searchBarangRequest;
#override
_ResultBarangActivityState createState() => _ResultBarangActivityState();
}
class _ResultBarangActivityState extends State<ResultBarangActivity> {
final _scaffoldKey = GlobalKey<ScaffoldState>();
#override
void initState(){
Future.delayed(Duration.zero,(){
setState(() {
widget.searchBarangRequest = ModalRoute.of(context).settings.arguments;
print(widget.searchBarangRequest.keyword);
});
});
super.initState();
}
#override
Widget build(BuildContext context) {
if (widget.searchBarangRequest == null) return Scaffold(); //this line is always executed
return ResultForm(
scaffoldKey: _scaffoldKey,
title: widget.searchBarangRequest.keyword,
subTitle: widget.searchBarangRequest.hargaRange.toString(),);
}
}
Thank!
I know what the mistake,
so, I made global variable (title, subtitle) and assign value from searchBarangRequest like this following code :
String title = "";
String subtitle = "";
class _ResultBarangActivityState extends State<ResultBarangActivity> {
final _scaffoldKey = GlobalKey<ScaffoldState>();
#override
void initState(){
Future.delayed(Duration.zero,(){
setState(() {
widget.searchBarangRequest = ModalRoute.of(context).settings.arguments;
title = widget.searchBarangRequest.keyword;
subtitle = "${Utils().kondisiToString(widget.searchBarangRequest.kondisiBarang)} | ${widget.searchBarangRequest.hargaRange.toString()}";
// print(widget.searchBarangRequest.keyword);
getProducts(widget.searchBarangRequest);
});
});
super.initState();
}
}
and it works perfectly! thank.
Related
I hope you could help me!
Error saying 'tables' has not been initiliazed. But when I set tables = [] instead of
widget.data.then((result) {tables = result.tables;})
it works. I think the problem comes from my app state data which is a Future.
My simplified code:
class NavBar extends StatefulWidget {
final Future<Metadata> data;
const NavBar({Key? key, required this.data}) : super(key: key);
#override
State<NavBar> createState() => _NavBarState();
}
class _NavBarState extends State<NavBar> {
late List<MyTable> tables;
#override
void initState() {
widget.data.then((result) {
tables = result.tables;
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: buildPages(page.p)
)
);
}
Widget buildPages(index){
switch (index) {
case 0:
return ShowTablesNew(tables: tables);
case 1:
return const Details();
case 2:
return const ShowTables();
default:
return const ShowTables();
}
}
}
Future doesn't contain any data. It's an asynchronous computation that will provide data "later". The initialization error happens because the variable 'tables' is marked as late init but is accessed before the future is completed, when in fact it's not initialized yet.
Check this codelab for async programming with dart.
For your code you can use async/await in the initState method doing something like this
String user = '';
#override
void initState() {
asyncInitState();
super.initState();
}
void asyncInitState() async {
final result = await fetchUser();
setState(() {
user = result;
});
}
but since you're using a list of custom objects the most straightforward way is probably to use a FutureBuilder widget
I pass the value of both userProfileID And ,userstype to Profilepage() as shown below but when i go to profile page and I try to print the value of both this variable I will get Null value, I think they Actually not passed from this _HomePageState, anyone help?
Here is Where I pass the Value of both
userProfileID as a UserID and userstype as UserTypes inside initState() below,
and both UserID and UserTypes are Obtained from SharedPrefrence
(I call GetData to obtain the value of UserID and UserTypes from SharedPreference )
class _HomePageState extends State<HomePage> {
String UserID;
String UserTypes;
List<Widget>_children;
bool isSignedIn= false;
int _CurrentIndex=0;
void initState(){
super.initState();
GetData();
_children=[
TimeLinePage(UsersIdTimeline:UserID,UsersTypeTimeline:UserTypes),
SearchPage(searchUserSID: UserID,searchUsertype:UserTypes), //search(),
UploadPage(uploadUserSID:UserID,uploadUsertype: UserTypes),
NotificationsPage(NotifyUserSID: UserID,NotifyUsertype:UserTypes),
ProfilePage(userProfileID:UserID,userstype:UserTypes),
];
if(FirebaseAuth.instance.currentUser!=null){
setState(() {
isSignedIn= true;
});
}else{
setState(() {
isSignedIn= false;
});
}
}
#override
Widget build(BuildContext context) {
if(isSignedIn){
return buildHomeScreen();
} else{
return buildSignedInScreen();
}
}
void GetData()async {
SharedPreferences preferences= await SharedPreferences.getInstance();
setState(() {
UserID=preferences.get('UserId');
UserTypes=preferences.get('UserType');
});
}
}
here is buildHomeScreen
class _HomePageState extends State<HomePage> {
// ignore: non_constant_identifier_names
String UserID;
String UserTypes;
List<Widget>_children;
List<Widget>_agentchildren;
bool isSignedIn= false;
// ignore: non_constant_identifier_names
int _CurrentIndex=0;
int _agentCurrentIndex=0;
void initState(){
super.initState();
GetData();
_children=[
TimeLinePage(UsersIdTimeline:UserID,UsersTypeTimeline:UserTypes),
SearchPage(searchUserSID: UserID,searchUsertype:UserTypes),
UploadPage(uploadUserSID:UserID,uploadUsertype:UserTypes),
NotificationsPage(NotifyUserSID: UserID,NotifyUsertype:UserTypes),
ProfilePage(userProfileID:UserID,userstype:UserTypes),
];
if(FirebaseAuth.instance.currentUser!=null){
setState(() {
isSignedIn= true;
});
}else{
setState(() {
isSignedIn= false;
});
}
}
#override
Widget build(BuildContext context) {
if(isSignedIn){
if(UserTypes=='agent'){
return buildagentScreen();
} else if(UserTypes== 'Signupuser'||
UserTypes== 'owner'||
UserTypes== 'seller'
){
return buildHomeScreen();
}else{
return buildSignedInScreen();
}
}
}
Here is My ProfilePage(), if I try to get the value of both
( String userstype; String userProfileID;) in this page
i get Null value but I alredy pass the value of them from the above _HomePageState()
class ProfilePage extends StatefulWidget {
String userstype;
String userProfileID;
ProfilePage({this.userProfileID, this.userstype});
#override
_ProfilePageState createState() => _ProfilePageState();
}
class _ProfilePageState extends State<ProfilePage> {
final String CurrentOnlineUserID=curentuser?.uid;
bool loading =false;
int countPost=0;
String postOrientation="grid";
List<Post> PostList=[];
void initState(){
getAllProfilePost();
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
appBar:header(context,strTitle:"profile"),
body:ListView(
children:<Widget>[
TopView(),
]
),
);
}
Use shared preferences globally for your application.
import 'dart:async' show Future;
import 'package:shared_preferences/shared_preferences.dart';
class PreferenceUtils {
static Future<SharedPreferences> get _instance async => _prefsInstance ??= await SharedPreferences.getInstance();
static SharedPreferences _prefsInstance;
// call this method from iniState() function of mainApp().
static Future<SharedPreferences> init() async {
_prefsInstance = await _instance;
return _prefsInstance;
}
static String getString(String key, [String defValue]) {
return _prefsInstance.getString(key) ?? defValue ?? "";
}
static Future<bool> setString(String key, String value) async {
var prefs = await _instance;
return prefs?.setString(key, value) ?? Future.value(false);
}
}
Please follow this link
https://stackoverflow.com/a/61046061/8218866
When the _HomePageState is created, the initState is called, and so this line:
_children=[
[...],
ProfilePage(userProfileID:UserID,userstype:UserTypes),
];
This line is creating the object of a ProfilePage with the desired UserID's and UserTypes. This ProfilePage object will be put inside the _children list.
When you do this:
setState(() {
UserID=preferences.get('UserId');
UserTypes=preferences.get('UserType');
});
You are 1) calling the build method again, and 2) updating the value of UserID and UserTypes. You did not change the value of any itens inside the _childrens list. Or the list itself. Hence the misbehavior you noticed.
There are many ways to solve this, but the essence would be to move this list declaration inside the build method. An example:
#override
Widget build(BuildContext context) {
_children = [.....]
if(isSignedIn){
[...]
Doing this way would not be a pretty way to do it, because you are creating lots of new (and useless) objets every time the build method is called. Maybe in a small application this wouldn't be a problem, and for didactic reasons I chose to show this way in this answer.
The more correct way would be to :
Switch and instantiate inside buildHomeScreen the body object:
Scaffold buildHomeScreen(){
Widget body;
switch (_currentIndex) {
case 0:
body =
TimeLinePage(UsersIdTimeline:UserID,UsersTypeTimeline:UserTypes);
break;
case 1:
body = ...;
break;
}
return Scaffold(
...
body: body,
...
)
}
Which should give you the same result.
I wanted to implements a simple tutorial of how parsing an Rss Feed with Flutter, here is my code:
import 'package:flutter/material.dart';
import 'package:webfeed/webfeed.dart';
import 'package:http/http.dart' as http;
import 'package:url_launcher/url_launcher.dart';
import 'package:cached_network_image/cached_network_image.dart';
class RSSParser extends StatefulWidget {
#override
_RSSParserState createState() => _RSSParserState();
}
class _RSSParserState extends State<RSSParser> {
final String url = "https://www.90min.com/posts.rss";
RssFeed _feed;
String _title;
static const String loadingFeedMsg = 'Loading Feed...';
static const String feedLoadErrorMsg = 'Error Loading Feed.';
static const String feedOpenErrorMsg = 'Error Opening Feed.';
Future<RssFeed> loadFeed() async{
try{
final client = http.Client();
final response = await client.get(url);
return RssFeed.parse(response.body);
}
catch(e){
}
return null;
}
updateTitle(title){
setState(() {
_title = title;
});
}
#override
void initState() {
// TODO: implement initState
super.initState();
updateTitle(widget.title);
}
updateFeed(feed){
setState(() {
_feed = feed;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(_title),
),
);
}
}
The problem is that i got a compilation error in that instruction
updateTitle(widget.title);
with the following error message:
The getter 'title' isn't defined for the type 'RSSParser'
In the tutorial, it works fine!!
Do you have an idea how to solve this?
Thank you
You haven't declared title for you RSS widget. It should look something like ths:
class RSSParser extends StatefulWidget {
final String title;
const RSSParser({required this.title});
This should solve your error.
This is not working because there is not title in RSS class.
I think you are not clear with use of widget.something. It means that in the class which extends StatefulWidget there is a something parameter which i need to get in stateObject.
See the code to understand.
class YellowBird extends StatefulWidget {
const YellowBird({ Key? key }) : super(key: key);
String someData = 'SomeData'; // Some data
#override
_YellowBirdState createState() => _YellowBirdState();
}
//This is the state object
class _YellowBirdState extends State<YellowBird> {
// Now that if you need some data from the above class. You use use this widget.someData to get it here
String getHere = widget.someData ;
#override
Widget build(BuildContext context) {
return Container(color: const Color(0xFFFFE306));
}
}
I am a true beginner in flutter and dart.
I have a problem concerning playing youtube videos using [ youtube_player_flutter: ^6.1.1]
I create a Json file with youtube links and I want to link it with [ youtube_player_flutter: ^6.1.1]. but it always displays the error message [Only static members can be accessed in initializers]
#override
Widget build(BuildContext context) {
// this function is called before the build so that
// the string assettoload is avialable to the DefaultAssetBuilder
setasset();
// and now we return the FutureBuilder to load and decode JSON
return FutureBuilder(
future:
DefaultAssetBundle.of(context).loadString(assettoload, cache: true),
builder: (context, snapshot) {
List mydata = json.decode(snapshot.data.toString());
if (mydata == null) {
return Scaffold(
body: Center(
child: Text(
"Loading",
),
),
);
} else {
return quizpage(mydata: mydata);
}
},
);
}
}
class quizpage extends StatefulWidget {
final dynamic mydata;
////////var youtubeUrl;
quizpage({Key key, #required this.mydata}) : super(key: key);
#override
_quizpageState createState() => _quizpageState(mydata);
}
class _quizpageState extends State<quizpage> {
var mydata;
_quizpageState(this.mydata);
int marks = 0;
int i = 1;
#override
void setState(fn) {
if (mounted) {
super.setState(fn);
}
}
YoutubePlayerController _controller;
#override
void initState() {
_controller = YoutubePlayerController(
initialVideoId: YoutubePlayer.convertUrlToId(mydata[4]["1"]));
super.initState();
}
void nextquestion() {
setState(() {
if (i < 10) {
i++;
} else {
Navigator.of(context).pushReplacement(MaterialPageRoute(
builder: (context) => resultpage(marks: marks),
));
}
The problem is that I want to make the [String videoURL ] plays the list of videos in my json data file.
Thanks in advance.
Possibility is that you coded the variable mydata twice. This is the format you should follow. And in order to make use of the variable from the StatefulWidget from the constructor, use widget.mydata. Don't have to declare it twice.
Code:
class Quizpage extends StatefulWidget {
final dynamic mydata;
quizpage({Key key, #required this.mydata}) : super(key: key);
#override
_QuizpageState createState() => _QuizpageState();
}
class _QuizpageState extends State<Quizpage> {
/*
You can make use of your mydata in this class like this:
widget.mydata, and you will be able to make it work
*/
Color colortoshow = Colors.indigoAccent;
Color right = Colors.green;
Color wrong = Colors.red;
int marks = 0;
int i = 1;
// String videoURL ="https://www.youtube.com/watch?v=2OAdfB2U88A&t=593s";
YoutubePlayerController _controller;
// Use like this to make use of your array mydata
String videoURL = widget.myData[4]["1"];
#override
void initState() {
_controller = YoutubePlayerController(
initialVideoId: YoutubePlayer.convertUrlToId(videoURL));
super.initState();
}
}
Also, this is for coding point of view. Please follow the correct way of naming classes in Flutter. Always use CamelCase or Have your first letter of the class as capital. This is the best practice while you write your code. I hope the above helps you in some sense. Thanks :)
I have 2 screens in my Flutter app: a list of records and a screen for creating and editing records.
If I pass an object to the second screen that means I am going to edit this and if I pass null it means that I am creating a new item. The editing screen is a Stateful widget and I am not sure how to use this approach https://flutter.io/cookbook/navigation/passing-data/ for my case.
class RecordPage extends StatefulWidget {
final Record recordObject;
RecordPage({Key key, #required this.recordObject}) : super(key: key);
#override
_RecordPageState createState() => new _RecordPageState();
}
class _RecordPageState extends State<RecordPage> {
#override
Widget build(BuildContext context) {
//.....
}
}
How can I access recordObject inside _RecordPageState?
To use recordObject in _RecordPageState, you have to just write widget.objectname like below
class _RecordPageState extends State<RecordPage> {
#override
Widget build(BuildContext context) {
.....
widget.recordObject
.....
}
}
Full Example
You don't need to pass parameters to State using it's constructor.
You can easily access these using widget.myField.
class MyRecord extends StatefulWidget {
final String recordName;
const MyRecord(this.recordName);
#override
MyRecordState createState() => MyRecordState();
}
class MyRecordState extends State<MyRecord> {
#override
Widget build(BuildContext context) {
return Text(widget.recordName); // Here you direct access using widget
}
}
Pass your data when you Navigate screen :
Navigator.of(context).push(MaterialPageRoute(builder: (context) => MyRecord("WonderWorld")));
class RecordPage extends StatefulWidget {
final Record recordObject;
RecordPage({Key key, #required this.recordObject}) : super(key: key);
#override
_RecordPageState createState() => new _RecordPageState(recordObject);
}
class _RecordPageState extends State<RecordPage> {
Record recordObject
_RecordPageState(this. recordObject); //constructor
#override
Widget build(BuildContext context) {. //closure has access
//.....
}
}
example as below:
class nhaphangle extends StatefulWidget {
final String username;
final List<String> dshangle;// = ["1","2"];
const nhaphangle({ Key key, #required this.username,#required this.dshangle }) : super(key: key);
#override
_nhaphangleState createState() => _nhaphangleState();
}
class _nhaphangleState extends State<nhaphangle> {
TextEditingController mspController = TextEditingController();
TextEditingController soluongController = TextEditingController();
final scrollDirection = Axis.vertical;
DateTime Ngaysx = DateTime.now();
ScrollController _scrollController = new ScrollController();
ApiService _apiService;
List<String> titles = [];
#override
void initState() {
super.initState();
_apiService = ApiService();
titles = widget.dshangle; //here var is call and set to
}
I have to Navigate back to any one of the screens in the list pages but when I did that my onTap function stops working and navigation stops.
class MyBar extends StatefulWidget {
MyBar({this.pageNumber});
final pageNumber;
static const String id = 'mybar_screen';
#override
_MyBarState createState() => _MyBarState();
}
class _MyBarState extends State<MyBar> {
final List pages = [
NotificationScreen(),
AppointmentScreen(),
RequestBloodScreen(),
ProfileScreen(),
];
#override
Widget build(BuildContext context) {
var _selectedItemIndex = widget.pageNumber;
return Scaffold(
bottomNavigationBar: BottomNavigationBar(
elevation: 0,
backgroundColor: Colors.white,
unselectedItemColor: Colors.grey.shade700,
selectedItemColor: Color(kAppColor),
selectedIconTheme: IconThemeData(color: Color(kAppColor)),
currentIndex: _selectedItemIndex,
type: BottomNavigationBarType.fixed,
onTap: (int index) {
setState(() {
_selectedItemIndex = index;
});
},
You should use a Pub/Sub mechanism.
I prefer to use Rx in many situations and languages. For Dart/Flutter this is the package: https://pub.dev/packages/rxdart
For example, you can use a BehaviorSubject to emit data from widget A, pass the stream to widget B which listens for changes and applies them inside the setState.
Widget A:
// initialize subject and put it into the Widget B
BehaviorSubject<LiveOutput> subject = BehaviorSubject();
late WidgetB widgetB = WidgetB(deviceOutput: subject);
// when you have to emit new data
subject.add(deviceOutput);
Widget B:
// add stream at class level
class WidgetB extends StatefulWidget {
final ValueStream<LiveOutput> deviceOutput;
const WidgetB({Key? key, required this.deviceOutput}) : super(key: key);
#override
State<WidgetB> createState() => _WidgetBState();
}
// listen for changes
#override
void initState() {
super.initState();
widget.deviceOutput.listen((event) {
print("new live output");
setState(() {
// do whatever you want
});
});
}
In my app, often instead of using stateful widgets, I use mainly ChangeNotifierProvider<T> in main.dart, some model class
class FooModel extends ChangeNotifier {
var _foo = false;
void changeFooState() {
_foo = true;
notifyListeners();
}
bool getFoo () => _foo;
}
and
var foo = context.read<FooModel>();
# or
var foo = context.watch<FooModel>();
in my stateless widgets. IMO this gives me more precise control over the rebuilding upon runtime state change, compared to stateful widgets.
The recipe can be found in the official docs, the concept is called "lifting state up".