RefreshIndicator not working with SingleChildScrollView as child - flutter

I am trying to use RefreshIndicator to reload a list I show on my home screen. The code looks similar to this:
class Home extends StatefulWidget {
#override
_StartHomeState createState() => _StartHomeState();
}
class _StartHomeState extends State<Home> {
EventsList events;
#override
void initState() {
super.initState();
events = EventsList();
}
#override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomPadding: false,
body: RefreshIndicator(
onRefresh: resfreshEventList,
child: SingleChildScrollView(
physics: AlwaysScrollableScrollPhysics(),
child: Column(
children: [
HomeTopBar(),
events,
],
),
),
),
);
}
Future<Null> resfreshEventList() async {
await Future.delayed(Duration(seconds: 2));
setState(() {
events = EventsList();
});
return null;
}
}
EventsList is another stateful widget that will call an API and map the response to a list of widgets. I have tried setting the physics property of the SingleChildScrollView as mentioned here: https://github.com/flutter/flutter/issues/22180 but no luck. Using ListView instead of the SingleChildScrollView doesn't work either.

It seems to be working fine in this example When I pull to refresh then resfreshEventList gets fired and also setState is working without any problem.
Here is the code which I am using:
import 'package:flutter/material.dart';
class Home extends StatefulWidget {
#override
_StartHomeState createState() => _StartHomeState();
}
class _StartHomeState extends State<Home> {
// EventsList events;
int number = 0;
#override
// void initState() {
// super.initState();
// events = EventsList();
// }
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text("RefreshIndicator Example"),
),
resizeToAvoidBottomPadding: false,
body: RefreshIndicator(
onRefresh: resfreshEventList,
child: SingleChildScrollView(
physics: AlwaysScrollableScrollPhysics(),
child: Column(
children: [
// HomeTopBar(),
// events,
Container(
height: 200,
width: 200,
color: Colors.red,
child: Center(
child: Text(number.toString()),
),
),
Divider(),
Container(
height: 200,
width: 200,
color: Colors.red,
child: Center(
child: Text(number.toString()),
),
),
Divider(),
Container(
height: 200,
width: 200,
color: Colors.red,
child: Center(
child: Text(number.toString()),
),
),
Divider(),
Container(
height: 200,
width: 200,
color: Colors.red,
child: Center(
child: Text(number.toString()),
),
),
Divider(),
Container(
height: 200,
width: 200,
color: Colors.red,
child: Center(
child: Text(number.toString()),
),
)
],
),
),
),
));
}
Future<Null> resfreshEventList() async {
// await Future.delayed(Duration(seconds: 2));
// setState(() {
// events = EventsList();
// });
setState(() {
number = number + 1;
});
print("Refresh Pressed");
return null;
}
}
Output:

Related

Flutter NestedScrollView header bounce with TabBar and TabbarView

Header pull to refresh can be pulled up when I want to drag it up.
Tabbar sticky.
ListView can swipe to another page.
100% Custom Widget. It supports to change the header value and also support swipe opeartions.
It is not actually a TabBar Widget but it Works exactly like that
import 'package:flutter/material.dart';
import 'dart:math';
class NestedScrolls extends StatefulWidget {
static const listHeader = ['Pakistan', 'China','Iran','Turkey'];
#override
_NestedScrollsState createState() => _NestedScrollsState();
}
class _NestedScrollsState extends State<NestedScrolls> {
var position=0;
var topHeader;
Widget? applyWidget() {
switch(position){
case 0:
setState(() {
topHeader = NestedScrolls.listHeader[0];
});
// return widget if user click over pakistan in tab bar
return grid();
case 1:
setState(() {
topHeader = NestedScrolls.listHeader[1];
});
return list();
case 2:
setState(() {
topHeader = NestedScrolls.listHeader[2];
});
return Container(color: Colors.blue,
child: Center(child: Text(topHeader),),);
case 3:
setState(() {
topHeader = NestedScrolls.listHeader[3];
});
return Container(color: Colors.orange,
child: Center(child: Text(topHeader),),);
}
}
#override
void initState() {
// TODO: implement initState
super.initState();
//initial header name when activity start first time
topHeader = NestedScrolls.listHeader[0];
}
#override
Widget build(BuildContext context) {
topHeader = topHeader;
return Scaffold(
// Persistent AppBar that never scrolls
appBar: AppBar(
title: Text('AppBar'),
elevation: 0.0,
),
body:
Column(
children: <Widget>[
///header
Container(
alignment: Alignment.center,
color: Colors.blueGrey,
height: 90,
child: Text(NestedScrolls.listHeader[position]),
),
/// tabBar
Container(
height: 60,
width: MediaQuery.of(context).size.width,
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: NestedScrolls.listHeader.length,
itemBuilder: (con, index) {
return GestureDetector(
onTap: () => setState(() {
position=index;
topHeader = NestedScrolls.listHeader[index];
}),
child: Padding(
padding: const EdgeInsets.symmetric(
vertical: 2.0, horizontal: 10),
child: Container(alignment: Alignment.center,
width: 100,
color: topHeader==NestedScrolls.listHeader[index]?Colors.black26:Colors.transparent,
child: Text(NestedScrolls.listHeader[index])),
),
);
}),
),
///Widget
Expanded(
child: GestureDetector(
// onHorizontalDragStart: (left){
// print('left : ${left.localPosition.direction}');
// // left.globalPosition.dx
//
// },
onHorizontalDragEnd: (start){
print('start : ${start.velocity.pixelsPerSecond.dx}');
if((start.velocity.pixelsPerSecond.dx)<-700){
if(position<NestedScrolls.listHeader.length-1 && position>=0)
setState(() {
position=position+1;
});
}else{}
if((start.velocity.pixelsPerSecond.dx)>900){
if(position<=NestedScrolls.listHeader.length-1 && position>0)
setState(() {
position=position-1;
});
}
print(position);
},
child: applyWidget()),
),
],
),
);
}
list() {
return SingleChildScrollView(scrollDirection: Axis.vertical,
child: Container(
child: Column(children: [
for(var color in Colors.primaries)
Container(color: color, height: 100.0)
],),
),
);
}
grid() {
return GridView.count(
padding: EdgeInsets.zero,
crossAxisCount: 3,
children: Colors.primaries.map((color) {
return Container(color: color, height: 100.0);
}).toList(),
);
}
}

Background image is moving when keyboards appears Flutter

i was searching a lot and reading a lot another threads and nothing work for my case, my background image is moving when keyboards appears. I tried my best, and I am getting frustrated already because I am wasting a lot of time, could someone help me with this?
the image goes up every time I open the textinput and the keyboard appears, I think my mistake is to position the elements in the code, or I am missing something but the truth is I can't figure out what my mistake is.
I want to add that this page" is a page of a PageView, I don't know if that will have something about causing the issue.
Cuz i switch between login and register pages with the buttons, they are a pageview.
import 'package:flutter/material.dart';
import 'package:plantsapp/screens/welcome_page.dart';
import 'package:plantsapp/services/authentication_service.dart';
import 'package:provider/provider.dart';
class LoginPage extends StatefulWidget {
#override
_LoginPageState createState() => _LoginPageState();
}
class _LoginPageState extends State<LoginPage> {
final TextEditingController emailController = TextEditingController();
final TextEditingController passwordController = TextEditingController();
AuthenticationService authServ = new AuthenticationService();
#override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
body: Stack(children: [
_crearfondo2(),
_loginForm()
],),
//_loginForm(),
);
}
Widget _crearfondo2() {
return Container(
height: double.infinity,
width: double.infinity,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/images/backgroundlogin.jpg'),
fit: BoxFit.cover,
)));
}
/*Widget _crearFondo() {
return Positioned(
child: Image.asset(
'assets/images/backgroundlogin.jpg',
fit: BoxFit.fill,
),
height: MediaQuery.of(context).size.height,
top: 0.0,
right: 0.0,
left: 0.0,
);
}*/
Widget _loginForm() {
return SingleChildScrollView(
child: Container(
color: Colors.white,
width: double.infinity,
margin: EdgeInsets.symmetric(horizontal: 20, vertical: 130),
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 60),
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Login',
style: TextStyle(fontSize: 20),
),
_emailForm(),
_passwordForm(),
_button(),
_buttonRegister(),
],
),
),
);
}
Widget _emailForm() {
return TextField(
controller: emailController,
decoration: InputDecoration(hintText: ('Email')),
);
}
Widget _passwordForm() {
return TextField(
controller: passwordController,
decoration: InputDecoration(hintText: ('Password')),
);
}
Widget _button() {
return RaisedButton(
child: Text('Login'),
onPressed: () async {
//Provider.of<AuthenticationService>(context, listen: false).
dynamic result = await authServ.signIn(
email: emailController.text.trim(),
password: passwordController.text.trim());
if (result == null) print('error signing in');
},
);
}
_buttonRegister() {
final navegacionModel = Provider.of<NavegacionModel>(context);
int index = 1;
return RaisedButton(
child: Text('Registrarse'),
onPressed: () {
// Navigator.pushNamed(context, 'registerpage');
navegacionModel.paginaActual = index;
navegacionModel.pageController;
},
);
}
}
WelcomePage:
class WelcomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (_) => new NavegacionModel(),
child: Scaffold(
body: _Paginas(),
),
);
}
}
class _Paginas extends StatelessWidget {
#override
Widget build(BuildContext context) {
final navegacionModel = Provider.of<NavegacionModel>(context);
return PageView(
controller: navegacionModel.pageController,
// physics: BouncingScrollPhysics(),
physics: NeverScrollableScrollPhysics(),
children: <Widget>[
LoginPage(),
RegisterPage(),
],
);
}
}
class NavegacionModel with ChangeNotifier {
int _paginaActual = 0;
PageController _pageController = new PageController();
int get paginaActual => this._paginaActual;
set paginaActual(int valor) {
this._paginaActual = valor;
_pageController.animateToPage(valor, duration: Duration(milliseconds: 235), curve: Curves.easeOut);
notifyListeners();
}
PageController get pageController => this._pageController;
}
Fixed!!! i will share how i fix it for someone need this:
welcome_page.dart
#override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (_) => new NavegacionModel(),
child: Scaffold(
resizeToAvoidBottomInset: false, // i had to add this here, when i add here the image didnt move anymore by the keyboard
body: _Paginas(),
),
);
}
}
login_page.dart
#override
Widget build(BuildContext context) {
return Stack( // i remove this unnecesary scaffold until i need childrens, for now, i just return the stack
children: [
_crearfondo2(),
Padding( //i add this Padding cuz the form didnt scroll with the "resizeToAvoidBottomInset: false" until i add this padding here.
padding: EdgeInsets.only(
bottom: MediaQuery.of(context).viewInsets.bottom,
),
child: _loginForm(),
),
],
);
}
Try Like This
Widget build(BuildContext context) {
return MaterialApp(
title: 'flutter background',
home: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("images/background.jpg"), fit: BoxFit.cover)),
child: Scaffold(
resizeToAvoidBottomInset: false,
backgroundColor: Colors.transparent,
appBar: AppBar(
elevation: 0,
backgroundColor: Colors.transparent,
title: Text('My App'),
centerTitle: true,
),
),
),
);
}
Use
resizeToAvoidBottomInset: false,
in the welcome page Scaffold
child: Scaffold(
body: _Paginas(),
),

Is there a way to push the updated state of data of one stateful widget into another stateful widget?

I have been struggling with the problem of pushing updated data from one widget to another. This problem occurs when I have two Stateful widgets and the data is updated in the parent Stateful widget but is not updated in the child Stateful widget. The error occurs with the usage of the freezed package but also occurs without it as well.
I have not been able to find anything that fixes this as of yet.
Below is an example:
First Stateful Widget:
class FirstWidget extends StatefulWidget {
#override
_FirstWidgetState createState() => _FirstWidgetState();
}
class _FirstWidgetState extends State<FirstWidget> {
ItemBloc _itemBloc = getit<ItemBloc>();
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
appBar: AppBar(
elevation: Mquery.width(context, 2.5),
backgroundColor: Colors.black
title: Text(
'First stateful widget',
style: TextStyle(fontSize: 17),
),
centerTitle: true,
),
body: BlocBuilder<ItemsBloc,ItemsState>(
cubit: _itemsBloc,
builder: (BuildContext context,ItemState state) {
return state.when(
initial: () => Container(),
loading: () => Center(child: CustomLoader()),
success: (_items) {
return AnotherStatefulWidget(
items: _items,
...
);
},
);
},
));
},
);
);
}
}
Second Stateful Widget:
class AnotherStatefulWidget extends StatefulWidget {
final List<String> items;
AnotherStatefulWidget(this.items);
#override
_AnotherStatefulWidgetState createState() => _AnotherStatefulWidgetState();
}
class _AnotherStatefulWidgetState extends State<AnotherStatefulWidget> {
final ScrollController scrollController = ScrollController();
ItemsBloc _itemsBloc = getit<ItemsBloc>();
bool _handleNotification(ScrollNotification notification, List<String> items) {
if (notification is ScrollEndNotification &&
scrollController.position.extentAfter == 0.00) {
_itemsBloc.add(ItemsLoadEvent.loadMoreItems(
categories: items, document: ...));
}
return false;
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
body: Container(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
width: double.infinity,
height: 280,
child: Padding(
padding: EdgeInsets.only(
right: 8,
),
child: NotificationListener<ScrollNotification>(
onNotification: (_n) =>
_handleNotification(_n, widget.items),
child: DraggableScrollbar.arrows(
alwaysVisibleScrollThumb: true,
controller: scrollController,
child: ListView.builder(
controller: scrollController,
itemCount: widget.items.length,
itemBuilder: (context, index) {
return GestureDetector(
child: Padding(
padding: EdgeInsets.all(16),
child: Align(
alignment: Alignment.center,
child: Text(
widget.items[index],
style: TextStyle(color: Colors.white),
)),
),
);
},
),
),
),
),
)
],
),
),
),
);
}
}
I would really appreciate any help!
Thank you for you time,
Matt

Flutter Background Image

I am extremely new to flutter and I am making an app for fun. I want to add a background image to my app but I can't find how. I know that I have to put that in BuildContext context but I can't find how. This is my code:
import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';
import 'package:flutter/material.dart';
typedef void OnError(Exception exception);
void main() {
runApp(new MaterialApp(debugShowCheckedModeBanner: false,home: LocalAudio()));
}
class LocalAudio extends StatefulWidget {
#override
_LocalAudio createState() => _LocalAudio();
}
class _LocalAudio extends State<LocalAudio> {
Duration _duration = new Duration();
Duration _position = new Duration();
AudioPlayer advancedPlayer;
AudioCache audioCache;
#override
void initState() {
super.initState();
initPlayer();
}
void initPlayer() {
advancedPlayer = new AudioPlayer();
audioCache = new AudioCache(fixedPlayer: advancedPlayer);
advancedPlayer.durationHandler = (d) => setState(() {
_duration = d;
});
advancedPlayer.positionHandler = (p) => setState(() {
_position = p;
});
}
String localFilePath;
Widget _tab(List<Widget> children) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
padding: EdgeInsets.all(16.0),
child: Column(
children: children
.map((w) => Container(child: w, padding: EdgeInsets.all(6.0)))
.toList(),
),
),
],
);
}
Widget _btn(String txt, VoidCallback onPressed) {
return ButtonTheme(
minWidth: 48.0,
child: Container(
width: 150,
height: 150,
child: RaisedButton(
shape:
RoundedRectangleBorder(borderRadius: BorderRadius.circular(25)),
child: Text(txt),
color: Colors.greenAccent[900],
textColor: Colors.white,
onPressed: onPressed),
),
);
}
Widget LocalAudio() {
return _tab([
_btn('Play', () => audioCache.play('bruh.mp3')),
]);
}
void seekToSecond(int second) {
Duration newDuration = Duration(seconds: second);
advancedPlayer.seek(newDuration);
}
#override
Widget build(BuildContext context) {
return DefaultTabController(
length: 1,
child: Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
elevation: 1.0,
backgroundColor: Colors.teal,
title: Center(child: Text('BRUH')),
),
body: TabBarView(
children: [LocalAudio()],
),
),
);
}
}
I would just set the body of your scaffold to be a Stack(), and then put an image in the bottom of the stack. Should look something like this.
#override
Widget build(BuildContext context) {
return DefaultTabController(
length: 1,
child: Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
elevation: 1.0,
backgroundColor: Colors.teal,
title: Center(child: Text('BRUH')),
),
body: Stack(
children: [
Image.asset('assets/images/background.jpg'),
TabBarView(
children: [LocalAudio()],
),
]
);
),
You can use Stack and put an image to the background, then set backgroundColor: Colors.transparent, in Scaffold widget
Stack(
children: <Widget>[
Image.asset(
"<Image.Path>",
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
fit: BoxFit.cover,
),
Scaffold(
backgroundColor: Colors.transparent,
body: Container(),
),
],
);

How to work with progress indicator in flutter?

I'm newbie in flutter and wanted to know what is better way to add CircularProgressIndicator in my layout. For example, my login view. This view have username, password and login Button. I did want create a overlay layout (with Opacity) that, when loading, show progress indicator like I use in NativeScript, but I'm little confused with how to do and too if it is the better way. On NativeScript, for example, I add IndicatorActivity in main layout and set busy to true or false, so it overlay all view components when is loading.
Edit:
I was able to reach this result:
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool _loading = false;
void _onLoading() {
setState(() {
_loading = true;
new Future.delayed(new Duration(seconds: 3), _login);
});
}
Future _login() async{
setState((){
_loading = false;
});
}
#override
Widget build(BuildContext context) {
var body = new Column(
children: <Widget>[
new Container(
height: 40.0,
padding: const EdgeInsets.all(10.0),
margin: const EdgeInsets.fromLTRB(15.0, 150.0, 15.0, 0.0),
decoration: new BoxDecoration(
color: Colors.white,
),
child: new TextField(
decoration: new InputDecoration.collapsed(hintText: "username"),
),
),
new Container(
height: 40.0,
padding: const EdgeInsets.all(10.0),
margin: const EdgeInsets.all(15.0),
decoration: new BoxDecoration(
color: Colors.white,
),
child: new TextField(
decoration: new InputDecoration.collapsed(hintText: "password"),
),
),
],
);
var bodyProgress = new Container(
child: new Stack(
children: <Widget>[
body,
new Container(
alignment: AlignmentDirectional.center,
decoration: new BoxDecoration(
color: Colors.white70,
),
child: new Container(
decoration: new BoxDecoration(
color: Colors.blue[200],
borderRadius: new BorderRadius.circular(10.0)
),
width: 300.0,
height: 200.0,
alignment: AlignmentDirectional.center,
child: new Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Center(
child: new SizedBox(
height: 50.0,
width: 50.0,
child: new CircularProgressIndicator(
value: null,
strokeWidth: 7.0,
),
),
),
new Container(
margin: const EdgeInsets.only(top: 25.0),
child: new Center(
child: new Text(
"loading.. wait...",
style: new TextStyle(
color: Colors.white
),
),
),
),
],
),
),
),
],
),
);
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Container(
decoration: new BoxDecoration(
color: Colors.blue[200]
),
child: _loading ? bodyProgress : body
),
floatingActionButton: new FloatingActionButton(
onPressed: _onLoading,
tooltip: 'Loading',
child: new Icon(Icons.check),
),
);
}
}
I'm still adapting to the idea of ​​states. This code is within the expected when working with flutter?
In flutter, there are a few ways to deal with Asynchronous actions.
A lazy way to do it can be using a modal. Which will block the user input, thus preventing any unwanted actions.
This would require very little change to your code. Just modifying your _onLoading to something like this :
void _onLoading() {
showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return Dialog(
child: new Row(
mainAxisSize: MainAxisSize.min,
children: [
new CircularProgressIndicator(),
new Text("Loading"),
],
),
);
},
);
new Future.delayed(new Duration(seconds: 3), () {
Navigator.pop(context); //pop dialog
_login();
});
}
The most ideal way to do it is using FutureBuilder and a stateful widget. Which is what you started.
The trick is that, instead of having a boolean loading = false in your state, you can directly use a Future<MyUser> user
And then pass it as argument to FutureBuilder, which will give you some info such as "hasData" or the instance of MyUser when completed.
This would lead to something like this :
#immutable
class MyUser {
final String name;
MyUser(this.name);
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
home: new MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Future<MyUser> user;
void _logIn() {
setState(() {
user = new Future.delayed(const Duration(seconds: 3), () {
return new MyUser("Toto");
});
});
}
Widget _buildForm(AsyncSnapshot<MyUser> snapshot) {
var floatBtn = new RaisedButton(
onPressed:
snapshot.connectionState == ConnectionState.none ? _logIn : null,
child: new Icon(Icons.save),
);
var action =
snapshot.connectionState != ConnectionState.none && !snapshot.hasData
? new Stack(
alignment: FractionalOffset.center,
children: <Widget>[
floatBtn,
new CircularProgressIndicator(
backgroundColor: Colors.red,
),
],
)
: floatBtn;
return new ListView(
padding: const EdgeInsets.all(15.0),
children: <Widget>[
new ListTile(
title: new TextField(),
),
new ListTile(
title: new TextField(obscureText: true),
),
new Center(child: action)
],
);
}
#override
Widget build(BuildContext context) {
return new FutureBuilder(
future: user,
builder: (context, AsyncSnapshot<MyUser> snapshot) {
if (snapshot.hasData) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Hello ${snapshot.data.name}"),
),
);
} else {
return new Scaffold(
appBar: new AppBar(
title: new Text("Connection"),
),
body: _buildForm(snapshot),
);
}
},
);
}
}
For me, one neat way to do this is to show a SnackBar at the bottom while the Signing-In process is taken place, this is a an example of what I mean:
Here is how to setup the SnackBar.
Define a global key for your Scaffold
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
Add it to your Scaffold key attribute
return new Scaffold(
key: _scaffoldKey,
.......
My SignIn button onPressed callback:
onPressed: () {
_scaffoldKey.currentState.showSnackBar(
new SnackBar(duration: new Duration(seconds: 4), content:
new Row(
children: <Widget>[
new CircularProgressIndicator(),
new Text(" Signing-In...")
],
),
));
_handleSignIn()
.whenComplete(() =>
Navigator.of(context).pushNamed("/Home")
);
}
It really depends on how you want to build your layout, and I am not sure what you have in mind.
Edit
You probably want it this way, I have used a Stack to achieve this result and just show or hide my indicator based on onPressed
class TestSignInView extends StatefulWidget {
#override
_TestSignInViewState createState() => new _TestSignInViewState();
}
class _TestSignInViewState extends State<TestSignInView> {
bool _load = false;
#override
Widget build(BuildContext context) {
Widget loadingIndicator =_load? new Container(
color: Colors.grey[300],
width: 70.0,
height: 70.0,
child: new Padding(padding: const EdgeInsets.all(5.0),child: new Center(child: new CircularProgressIndicator())),
):new Container();
return new Scaffold(
backgroundColor: Colors.white,
body: new Stack(children: <Widget>[new Padding(
padding: const EdgeInsets.symmetric(vertical: 50.0, horizontal: 20.0),
child: new ListView(
children: <Widget>[
new Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center
,children: <Widget>[
new TextField(),
new TextField(),
new FlatButton(color:Colors.blue,child: new Text('Sign In'),
onPressed: () {
setState((){
_load=true;
});
//Navigator.of(context).push(new MaterialPageRoute(builder: (_)=>new HomeTest()));
}
),
],),],
),),
new Align(child: loadingIndicator,alignment: FractionalOffset.center,),
],));
}
}
Create a bool isLoading and set it to false. With the help of ternary operator, When user clicks on login button set state of isLoading to true. You will get circular loading indicator in place of login button
isLoading ? new PrimaryButton(
key: new Key('login'),
text: 'Login',
height: 44.0,
onPressed: setState((){isLoading = true;}))
: Center(
child: CircularProgressIndicator(),
),
You can see Screenshots how it looks while before login is clicked
After login is clicked
In mean time you can run login process and login user. If user credentials are wrong then again you will setState of isLoading to false, such that loading indicator will become invisible and login button visible to user.
By the way, primaryButton used in code is my custom button. You can do same with OnPressed in button.
Step 1: Create Dialog
showAlertDialog(BuildContext context){
AlertDialog alert=AlertDialog(
content: new Row(
children: [
CircularProgressIndicator(),
Container(margin: EdgeInsets.only(left: 5),child:Text("Loading" )),
],),
);
showDialog(barrierDismissible: false,
context:context,
builder:(BuildContext context){
return alert;
},
);
}
Step 2: Call it
showAlertDialog(context);
await firebaseAuth.signInWithEmailAndPassword(email: email, password: password);
Navigator.pop(context);
Example Dialog and login form
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
class DynamicLayout extends StatefulWidget{
#override
State<StatefulWidget> createState() {
// TODO: implement createState
return new MyWidget();
}
}
showAlertDialog(BuildContext context){
AlertDialog alert=AlertDialog(
content: new Row(
children: [
CircularProgressIndicator(),
Container(margin: EdgeInsets.only(left: 5),child:Text("Loading" )),
],),
);
showDialog(barrierDismissible: false,
context:context,
builder:(BuildContext context){
return alert;
},
);
}
class MyWidget extends State<DynamicLayout>{
Color color = Colors.indigoAccent;
String title='app';
GlobalKey<FormState> globalKey=GlobalKey<FormState>();
String email,password;
login() async{
var currentState= globalKey.currentState;
if(currentState.validate()){
currentState.save();
FirebaseAuth firebaseAuth=FirebaseAuth.instance;
try {
showAlertDialog(context);
AuthResult authResult=await firebaseAuth.signInWithEmailAndPassword(
email: email, password: password);
FirebaseUser user=authResult.user;
Navigator.pop(context);
}catch(e){
print(e);
}
}else{
}
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar:AppBar(
title: Text("$title"),
) ,
body: Container(child: Form(
key: globalKey,
child: Container(
padding: EdgeInsets.all(10),
child: Column(children: <Widget>[
TextFormField(decoration: InputDecoration(icon: Icon(Icons.email),labelText: 'Email'),
// ignore: missing_return
validator:(val){
if(val.isEmpty)
return 'Please Enter Your Email';
},
onSaved:(val){
email=val;
},
),
TextFormField(decoration: InputDecoration(icon: Icon(Icons.lock),labelText: 'Password'),
obscureText: true,
// ignore: missing_return
validator:(val){
if(val.isEmpty)
return 'Please Enter Your Password';
},
onSaved:(val){
password=val;
},
),
RaisedButton(color: Colors.lightBlue,textColor: Colors.white,child: Text('Login'),
onPressed:login),
],)
,),)
),
);
}
}
Example from Ui
1. Without plugin
class IndiSampleState extends State<ProgHudPage> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Demo'),
),
body: Center(
child: RaisedButton(
color: Colors.blueAccent,
child: Text('Login'),
onPressed: () async {
showDialog(
context: context,
builder: (BuildContext context) {
return Center(child: CircularProgressIndicator(),);
});
await loginAction();
Navigator.pop(context);
},
),
));
}
Future<bool> loginAction() async {
//replace the below line of code with your login request
await new Future.delayed(const Duration(seconds: 2));
return true;
}
}
2. With plugin
check this plugin progress_hud
add the dependency in the pubspec.yaml file
dev_dependencies:
progress_hud:
import the package
import 'package:progress_hud/progress_hud.dart';
Sample code is given below to show and hide the indicator
class ProgHudPage extends StatefulWidget {
#override
_ProgHudPageState createState() => _ProgHudPageState();
}
class _ProgHudPageState extends State<ProgHudPage> {
ProgressHUD _progressHUD;
#override
void initState() {
_progressHUD = new ProgressHUD(
backgroundColor: Colors.black12,
color: Colors.white,
containerColor: Colors.blue,
borderRadius: 5.0,
loading: false,
text: 'Loading...',
);
super.initState();
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('ProgressHUD Demo'),
),
body: new Stack(
children: <Widget>[
_progressHUD,
new Positioned(
child: RaisedButton(
color: Colors.blueAccent,
child: Text('Login'),
onPressed: () async{
_progressHUD.state.show();
await loginAction();
_progressHUD.state.dismiss();
},
),
bottom: 30.0,
right: 10.0)
],
));
}
Future<bool> loginAction()async{
//replace the below line of code with your login request
await new Future.delayed(const Duration(seconds: 2));
return true;
}
}
I took the following approach, which uses a simple modal progress indicator widget that wraps whatever you want to make modal during an async call.
The example in the package also addresses how to handle form validation while making async calls to validate the form (see flutter/issues/9688 for details of this problem). For example, without leaving the form, this async form validation method can be used to validate a new user name against existing names in a database while signing up.
https://pub.dartlang.org/packages/modal_progress_hud
Here is the demo of the example provided with the package (with source code):
Example could be adapted to other modal progress indicator behaviour (like different animations, additional text in modal, etc..).
This is my solution with stack
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'dart:async';
final themeColor = new Color(0xfff5a623);
final primaryColor = new Color(0xff203152);
final greyColor = new Color(0xffaeaeae);
final greyColor2 = new Color(0xffE8E8E8);
class LoadindScreen extends StatefulWidget {
LoadindScreen({Key key, this.title}) : super(key: key);
final String title;
#override
LoginScreenState createState() => new LoginScreenState();
}
class LoginScreenState extends State<LoadindScreen> {
SharedPreferences prefs;
bool isLoading = false;
Future<Null> handleSignIn() async {
setState(() {
isLoading = true;
});
prefs = await SharedPreferences.getInstance();
var isLoadingFuture = Future.delayed(const Duration(seconds: 3), () {
return false;
});
isLoadingFuture.then((response) {
setState(() {
isLoading = response;
});
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.title,
style: TextStyle(color: primaryColor, fontWeight: FontWeight.bold),
),
centerTitle: true,
),
body: Stack(
children: <Widget>[
Center(
child: FlatButton(
onPressed: handleSignIn,
child: Text(
'SIGN IN WITH GOOGLE',
style: TextStyle(fontSize: 16.0),
),
color: Color(0xffdd4b39),
highlightColor: Color(0xffff7f7f),
splashColor: Colors.transparent,
textColor: Colors.white,
padding: EdgeInsets.fromLTRB(30.0, 15.0, 30.0, 15.0)),
),
// Loading
Positioned(
child: isLoading
? Container(
child: Center(
child: CircularProgressIndicator(
valueColor: AlwaysStoppedAnimation<Color>(themeColor),
),
),
color: Colors.white.withOpacity(0.8),
)
: Container(),
),
],
));
}
}
You can do it for center transparent progress indicator
Future<Null> _submitDialog(BuildContext context) async {
return await showDialog<Null>(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return SimpleDialog(
elevation: 0.0,
backgroundColor: Colors.transparent,
children: <Widget>[
Center(
child: CircularProgressIndicator(),
)
],
);
});
}
{
isloading? progressIos:Container()
progressIos(int i) {
return Container(
color: i == 1
? AppColors.liteBlack
: i == 2 ? AppColors.darkBlack : i == 3 ? AppColors.pinkBtn : '',
child: Center(child: CupertinoActivityIndicator()));
}
}
You can use FutureBuilder widget instead. This takes an argument which must be a Future. Then you can use a snapshot which is the state at the time being of the async call when loging in, once it ends the state of the async function return will be updated and the future builder will rebuild itself so you can then ask for the new state.
FutureBuilder(
future: myFutureFunction(),
builder: (context, AsyncSnapshot<List<item>> snapshot) {
if (!snapshot.hasData) {
return Center(
child: CircularProgressIndicator(),
);
} else {
//Send the user to the next page.
},
);
Here you have an example on how to build a Future
Future<void> myFutureFunction() async{
await callToApi();}
Centered on screen:
Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
children: [CircularProgressIndicator()])
])
class Loader extends StatefulWidget {
#override
State createState() => LoaderState();
}
class LoaderState extends State<Loader> with SingleTickerProviderStateMixin {
AnimationController controller;
Animation<double> animation;
#override
void initState() {
super.initState();
controller = AnimationController(
duration: Duration(milliseconds: 1200), vsync: this);
animation = CurvedAnimation(parent: controller, curve: Curves.elasticOut);
animation.addListener(() {
this.setState(() {});
});
animation.addStatusListener((AnimationStatus status) {});
controller.repeat();
}
#override
void dispose() {
controller.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
color: Colors.blue,
height: 3.0,
width: animation.value * 100.0,
),
Padding(
padding: EdgeInsets.only(bottom: 5.0),
),
Container(
color: Colors.blue[300],
height: 3.0,
width: animation.value * 75.0,
),
Padding(
padding: EdgeInsets.only(bottom: 5.0),
),
Container(
color: Colors.blue,
height: 3.0,
width: animation.value * 50.0,
)
],
);
}
}
Expanded(
child: Padding(
padding:
EdgeInsets.only(left: 20.0, right: 5.0, top:20.0),
child: GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => FirstScreen()));
},
child: Container(
alignment: Alignment.center,
height: 45.0,
decoration: BoxDecoration(
color: Color(0xFF1976D2),
borderRadius: BorderRadius.circular(9.0)),
child: Text('Login',
style: TextStyle(
fontSize: 20.0, color: Colors.white))),
),
),
),
For your case, maybe it can be done by using showing a modal with a circle indicator. But I recommend using a simple plugin https://pub.dev/packages/flutter_easyloading.
The installation supper easy. Just run this flutter pub add flutter_easyloading in your terminal
Put this in you main.dart app
import 'package:flutter/material.dart';
import 'package:kunjungi_dokter/pages/welcome.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart'; // <- add this
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: const Welcome(),
builder: EasyLoading.init(), // <- add this
);
}
}
To show the modal or the loading widget, in my case I show it in mya _login function in Login Screen:
import 'package:flutter_easyloading/flutter_easyloading.dart';
// ... other code
_login() async {
EasyLoading.show(status: 'loading...', maskType: EasyLoadingMaskType.black); // code to show modal with masking
var data = await LoginAPI.connectToAPI(
emailController.text, passwordController.text);
if (data.isError) {
EasyLoading.showError('Login Error: ' + data.message); // code to show modal without masking and auto close
} else {
await storage.write(key: 'token', value: data.token);
await storage.write(key: 'email', value: emailController.text);
EasyLoading.showSuccess('Login Success!'); // code to show modal without masking and auto close
Navigator.of(context)
.push(MaterialPageRoute(builder: ((context) => const Home())));
}
}
// ... other code
Tips, you can use this to close the modal:
EasyLoading.dismiss();
You will need a library for it
void onLoading() {
showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return GFLoader(
type: GFLoaderType.android,
);
},
);
}
and then use this function where you need in code
onLoading;