I created an application in android studio to navigate from one screen to another.Here two stateless widgets are created as two screens and both contain a button to navigate pages each other. However when i run the application a red screen is generated on my android phone I get an error saying
exception 'Column's children must not contain any null values, but a null value was found at index 0'.
I have provided my code below:
FIRST SCREEN
class FirstScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("First Screen"),
),
body: Container(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
center(
decoration: new BoxDecoration(
image: new DecorationImage(
image: new AssetImage('assets/new 7wonders.jpg'),
fit: BoxFit.cover,
),
),
),
Text('New 7 Wonders',
style: TextStyle(fontSize: 40, fontStyle: FontStyle.italic),
),
RaisedButton(
child: Text("Bang Here"),
onPressed: (){
Navigator.push(context, MaterialPageRoute(builder: (context) => SecondScreen()));
},
color: Colors.red,
textColor: Colors.yellow,
padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
splashColor: Colors.grey,
)
],
),
),
),
);
}
center({BoxDecoration decoration}) {}
}
SECOND SCREEN
class SecondScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Screen"),
),
body: RaisedButton(
child: Text("Go to First page"),
onPressed:() {
Navigator.pop(context);
},
),
);
}
}
Your center
method should return a Widget, it is currently providing null
to the Column
.
Do this instead:
Widget center() {
// return a decorated box widget which gives you the decoration property
return Image(
image: AssetImage(
'assets/new 7wonders.jpg',),
fit: BoxFit.cover,
);
}
}
Then use in your Column
like:
Container(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
// call the center method which returns a Widget
center(),
Text(
'New 7 Wonders',
style: TextStyle(fontSize: 40, fontStyle: FontStyle.italic),
),
RaisedButton(
child: Text("Bang Here"),
onPressed: () {
Navigator.push(context,
MaterialPageRoute(builder: (context) => SecondScreen()));
},
color: Colors.red,
textColor: Colors.yellow,
padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
splashColor: Colors.grey,
)
],
),
),
),
you have to return any widget in center
center({BoxDecoration decoration}) {
return Container();
}
You tryed write Center
instead center
in line 24? And in Center must be will return for example Containter()
In 24th line, you returned null value. You can implement the center method like this;
return Container();
Remove center use this
Container(
height: 100, // height and width according to your ui
width:100,
child:Image.asset(('assets/new7wonders.jpg',fit: BoxFit.cover,), // use for local image from asset and please change image name in code as well as in asset folder.there should not be space between image name .
),
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