'How to fix black screen in flutter while Navigating?
I am creating a multi-paged app on flutter. When I am using the navigation in it, I am getting a black screen.
import 'package:flutter/material.dart';
void main() => runApp(MyHomePage());
class MyHomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Page0(),
);
}
}
class Page0 extends StatefulWidget {
@override
_Page0State createState() => _Page0State();
}
class _Page0State extends State {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xFF493597),
body: ListView(
children: [
Padding(
padding: EdgeInsets.only(top: 15.0, left: 10.0),
),
SizedBox(
height: 25.0,
),
Padding(
padding: EdgeInsets.only(left: 40.0),
child: Row(
children: [
Text(
'Expense',
style: TextStyle(
fontFamily: 'Montserrat',
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 25.0),
),
SizedBox(
width: 10.0,
),
Text(
'What',
style: TextStyle(
fontFamily: 'Montserrat',
color: Colors.white,
fontSize: 25.0,
),
),
],
),
),
SizedBox(height: 60.0),
Container(
margin: EdgeInsets.only(
left: 10.0,
right: 10.0,
),
height: MediaQuery.of(context).size.height - 150,
decoration: BoxDecoration(
color: Color(0xFFFCFCFC),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(75.0),
topRight: Radius.circular(75.0),
),
),
child: ListView(
primary: false,
padding: EdgeInsets.only(
left: 15.0,
right: 20.0,
top: 25.0,
),
children: [
Padding(
padding: const EdgeInsets.only(
top: 30.0,
),
child: Column(
children: [
//greeting text
Row(
children: [
Expanded(
child: Center(
child: Text(
'Hello! :)',
style: TextStyle(
fontFamily: 'Permanent-Marker',
color: Colors.black,
fontSize: 30.0,
),
),
),
),
],
),
SizedBox(
height: 30.0,
),
//add button
Row(children: [
Expanded(
flex: 1,
child: Container(
height: 100.0,
width: 100.0,
child: FittedBox(
child: FloatingActionButton(
elevation: 10.0,
backgroundColor: Colors.white,
child: Icon(
Icons.add,
color: Colors.black,
),
onPressed: () {
Navigator.push(context,MaterialPageRoute(builder: (context) => NewTrip()),);
},
),``
),
),
),
//add text
Expanded(
flex: 1,
child: Text(
'New trip',
style: TextStyle(
fontFamily: 'Nanum',
fontSize: 30.0,
),
),
),
]),
SizedBox(
height: 30.0,
),
//previous trip button
Row(
children: [
Expanded(
flex: 1,
child: Container(
height: 100.0,
width: 100.0,
child: FittedBox(
child: FloatingActionButton(
elevation: 10.0,
backgroundColor: Colors.white,
onPressed: () {},
child: Icon(
Icons.assessment,
color: Colors.black,
),
),
),
),
),
//previous trip text
Expanded(
flex: 1,
child: Text(
'Previous trips',
style: TextStyle(
fontFamily: 'Nanum',
fontSize: 30.0,
),
),
)
],
),
SizedBox(
height: 50.0,
),
],
),
),
],
),
),
],
),
);
}
}
And the NewTrip widget is as follows
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Text('NEW TRIP'),
),
);
}
}
The home page is loading fine but as soon as I click the new trip button, it shows a black screen. Probably there is an issue with MaterialApp or Scaffold but I am not able to fix it yet. Can anyone tell me what's the problem and how to fix it?
Updated the full code as requested in the comments.
Solution 1:[1]
Okay so after some research on the internet, I found out that it's the FloatingActionButton that is causing the trouble.
I replaced the FloatingActionButton with MaterialButton and this fixed my issue.
Solution 2:[2]
So in NewTrip() remove MaterialApp since it inherits from the parent. Just return Scaffold.
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text('NEW TRIP'),
);
}
}
Solution 3:[3]
Remove the MaterialApp()
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text('NEW TRIP'),
);
}
}
Solution 4:[4]
Please check the full code edit from your code. Actually you are using two FloatingActionButton. So you need to use two heroTag with different name. I already added in the code. No problem with NewTrip class.
import 'package:flutter/material.dart';
class MyHomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Page0(),
);
}
}
class Page0 extends StatefulWidget {
@override
_Page0State createState() => _Page0State();
}
class _Page0State extends State {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xFF493597),
body: ListView(
children: [
Padding(
padding: EdgeInsets.only(top: 15.0, left: 10.0),
),
SizedBox(
height: 25.0,
),
Padding(
padding: EdgeInsets.only(left: 40.0),
child: Row(
children: [
Text(
'Expense',
style: TextStyle(
fontFamily: 'Montserrat',
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 25.0),
),
SizedBox(
width: 10.0,
),
Text(
'What',
style: TextStyle(
fontFamily: 'Montserrat',
color: Colors.white,
fontSize: 25.0,
),
),
],
),
),
SizedBox(height: 60.0),
Container(
margin: EdgeInsets.only(
left: 10.0,
right: 10.0,
),
height: MediaQuery.of(context).size.height - 150,
decoration: BoxDecoration(
color: Color(0xFFFCFCFC),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(75.0),
topRight: Radius.circular(75.0),
),
),
child: ListView(
primary: false,
padding: EdgeInsets.only(
left: 15.0,
right: 20.0,
top: 25.0,
),
children: [
Padding(
padding: const EdgeInsets.only(
top: 30.0,
),
child: Column(
children: [
//greeting text
Row(
children: [
Expanded(
child: Center(
child: Text(
'Hello! :)',
style: TextStyle(
fontFamily: 'Permanent-Marker',
color: Colors.black,
fontSize: 30.0,
),
),
),
),
],
),
SizedBox(
height: 30.0,
),
//add button
Row(children: [
Expanded(
flex: 1,
child: Container(
height: 100.0,
width: 100.0,
child: FittedBox(
child: FloatingActionButton(
heroTag: "btn",
elevation: 10.0,
backgroundColor: Colors.white,
child: Icon(
Icons.add,
color: Colors.black,
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => NewTrip()),
);
},
),
),
),
),
//add text
Expanded(
flex: 1,
child: Text(
'New trip',
style: TextStyle(
fontFamily: 'Nanum',
fontSize: 30.0,
),
),
),
]),
SizedBox(
height: 30.0,
),
//previous trip button
Row(
children: [
Expanded(
flex: 1,
child: Container(
height: 100.0,
width: 100.0,
child: FittedBox(
child: FloatingActionButton(
heroTag: "btn1",
elevation: 10.0,
backgroundColor: Colors.white,
onPressed: () {},
child: Icon(
Icons.assessment,
color: Colors.black,
),
),
),
),
),
//previous trip text
Expanded(
flex: 1,
child: Text(
'Previous trips',
style: TextStyle(
fontFamily: 'Nanum',
fontSize: 30.0,
),
),
)
],
),
SizedBox(
height: 50.0,
),
],
),
),
],
),
),
],
),
);
}
}
NewTrip class
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text('NEW TRIP'),
);
}
}
Solution 5:[5]
Before:
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Text('NEW TRIP'),
);
}
}
So to Solve this problem we wrap the new navigate widget with scaffold widget
Solution After:
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Material(
child: Text('NEW TRIP'),
),
);
}
}
Solution 6:[6]
The issue is that you are using a materialApp inside another materialApp
Navigator just changes the pages and we don't need separate materialApp in NewTrip().
So the NewTrip should be as follow
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text('NEW TRIP'),
);
}
}
Solution 7:[7]
Use ThemeData, along with the parameter scaffoldBackgroundColor.
For example:
ThemeData (
scaffoldBackgroundColor: Colors.black,
)
Solution 8:[8]
In my case, it is caused by:
// to set portait screen orientation
SystemChrome.setPreferredOrientation([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
// Instead i use `android:screenOrientation="portrait"` on my AndroidManifest.xml.
That I declared when the page widget render. Removed it solve my black screen issue.
Solution 9:[9]
I believe there can only be one MaterialApp Widget in the entire Flutter application because MaterialApp Widget is likely to be the main or core component of Flutter. So when you try to navigate to a new screen try returning Scaffold Widget instead of MaterialApp Widget.
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text('NEW TRIP'),
);
}
}
Solution 10:[10]
Change scaffoldBackgroundColor
theme: ThemeData(
primarySwatch: Colors.blue,
scaffoldBackgroundColor: Colors.white, //here
visualDensity: VisualDensity.adaptivePlatformDensity,
),
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text('NEW TRIP'),
);
}
}
Solution 11:[11]
FloatingActionButton is the problem so if you really want to use the floating action button you should add each of them to unique heroTag. Now you will be able to use FloatingActionButton without any problem. Never use more than one floating action button without using HeroTag on the same page.
Solution 12:[12]
simply just put scaffold in next page that's it.
Solution 13:[13]
class NewTrip extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Text('NEW TRIP'),
),
);
}
}
remove the material app and return scaffold it will surely work fine
else if you have issues with the floating button then add
heroTag: "btn1",
heroTag: "btn2",
There are multiple heroes that share the same tag within a subtree
Solution 14:[14]
If the page you navigate does not contain Scaffold the page will be black since Scaffold Implements the basic material design visual layout structure so apply Scaffold and the parent widget material app.
Solution 15:[15]
The problem you are facing because the widget you are navigating does not have any material widget.
Just wrap the navigated screen's return widget with Scaffold as a parent.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow