How do I add loading screen in Flutter
Solution 1
Just check out this example I have created for you:
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
bool _isLoading = false; // This is initially false where no loading state
List<Timings> timingsList = List();
@override
void initState() {
super.initState();
dataLoadFunction(); // this function gets called
}
dataLoadFunction() async {
setState(() {
_isLoading = true; // your loader has started to load
});
// fetch you data over here
setState(() {
_isLoading = false; // your loder will stop to finish after the data fetch
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: _isLoading
? CircularProgressIndicator() // this will show when loading is true
: Text('You widget tree after loading ...') // this will show when loading is false
),
);
}
}
Let me know if it works
Solution 2
I use flutter_spinkit for the animation.
The package flutter_spinkit is a collection of loading indicators animated with flutter.
Here the Loading widget:
import 'package:flutter/material.dart';
import 'package:flutter_spinkit/flutter_spinkit.dart';
class Loading extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container(
color: Colors.white,
child: Center(
child: SpinKitFadingCube(
color: Colors.lightGreen[100],
size: 50.0
)
)
);
}
}
Then, from within your widgets, you need to:
import '[yourpath]/loading.dart';
bool loading = false;
@override
Widget build(BuildContext context) {
return loading ? Loading() : Scaffold(
body: Container(...
Wherever is your click event, you should set the state of loading to TRUE:
setState(() => loading = true)
and where the callback is, you should set the state back to FALSE:
setState(() => loading = false)
Solution 3
You can try creating a widget component such as this and save it with the name progress.dart
import 'package:flutter/material.dart';
Container circularProgress() {
return Container(
alignment: Alignment.center,
padding: EdgeInsets.only(top: 10.0),
child: CircularProgressIndicator(
strokeWidth: 2.0,
valueColor: AlwaysStoppedAnimation(primaryColor), //any color you want
),
);
}
Then import the progress.dart and create a separate container
Container loadingScreen() {
return circularProgress();
}
Then change your code to:
class RootScreenSM extends StatefulWidget {
@override
_RootScreenSMState createState() => _RootScreenSMState();
}
class _RootScreenSMState extends State<RootScreenSM> {
@override
Widget build(BuildContext context) {
return StreamBuilder<FirebaseUser>(
stream: FirebaseAuth.instance.onAuthStateChanged,
builder: (BuildContext context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return loadingScreen(); // Container that you just created
} else {
if (snapshot.hasData) {
return HomePage(
firebaseUser: snapshot.data,
);
} else {
return
notloggedin();
}
}
},
);
}
You can try this method and let us know if it worked
![Tripping](https://lh4.googleusercontent.com/-4VLmfJyUb9M/AAAAAAAAAAI/AAAAAAAAAAA/AAKWJJMizF_E3Of5ZguCn_DdZP5TG2auCA/photo.jpg?sz=256)
Tripping
Updated on December 22, 2022Comments
-
Tripping over 1 year
I am making an app with flutter and I want a loading screen while fetching data from firestore I used to do this in android by
setvisibilty
.I am new to flutter and I don't know how to do it I saw some questions on stack but they didn't seem to help fullI want to show the loading screen if
firebaseUser
is notnull
, this is myinitState
methodvoid initState() { super.initState(); isRegistered(); } @override Widget build(BuildContext context) { return Scaffold( body: Container( padding: EdgeInsets.all(32), child: Form( child: Column( crossAxisAlignment: CrossAxisAlignment.start, mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text("Login"), SizedBox( height: 16, ), Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ Container( width: 50, child: TextFormField( maxLength: 4, keyboardType: TextInputType.number, controller: countryCodeController, decoration: InputDecoration( hintText: '+251', ), ), ), Container( width: 200, child: TextFormField( maxLength: 9, keyboardType: TextInputType.number, controller: phonenumberController, decoration: InputDecoration( hintText: '912345678', ), ), ), ], ), SizedBox( height: 16, ), Container( width: double.infinity, child: FlatButton( child: Text('Login'), color: Colors.white, padding: EdgeInsets.all(16), onPressed: () { final phoneNumber = countryCodeController.text.trim() + phonenumberController.text.trim(); if(phonenumberController.text.trim().length == 9 || countryCodeController.text.trim().length == 4){ loginUser(phoneNumber, context); }else{ Fluttertoast.showToast(msg: "wronge input"); } }), ) ], ), ), ), ); } void isRegistered() async{ FirebaseAuth firebaseAuth = FirebaseAuth.instance; final FirebaseUser firebaseUser = await firebaseAuth.currentUser(); final snapShot = await Firestore.instance.collection("users").document( firebaseUser.uid).get(); if (firebaseUser != null) { if (snapShot.exists) { Navigator.pushReplacement( context, MaterialPageRoute( builder: (context) => HomePage( firebaseUser: firebaseUser, ))); }else{ } } } }