I am struggling to understand why there is a yellow space between my two widgets... I am using a listView widget which use a snapshot to create a list
Here is my code
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: SingleChildScrollView(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 24.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Text(
'My least tested groups',
),
Container(
color: Colors.yellowAccent,
child: SchoolList(),
),
],
),
),
),
),
);
}
And this is the Widget
class SchoolList extends StatelessWidget {
#override
Widget build(BuildContext context) {
return StreamBuilder<QuerySnapshot>(
stream: myStream1,
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.hasError) return new Text('Error: ${snapshot.error}');
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return new Text(
'Loading...',
style: kSendButtonTextStyle.copyWith(color: kColorText),
);
default:
return new ListView(
shrinkWrap: true,
physics: ClampingScrollPhysics(),
children:
snapshot.data.documents.map((DocumentSnapshot document) {
return Container(
height: 100,
width: 100,
color: Colors.white,
child: Text('xxx'));
}).toList(),
);
}
},
);
}
}
Can anyone understand why I have a yellow gap and more importantly how to get rid of it?
I think the ListView trying to applying top padding for status bar.
you can remove it by setting padding: const EdgeInsets.all(0.0) in the ListView widget.
Related
I searched in a lot of topics but couldn't find solution to my problem. I try to make lazy loading with FutureBuilder to listview. All topics I found the code different from what I have. I don't want to apply it from a package. Sorry about that but I'm still not a professional in flutter. Can someone help me.
thank you
My code:
class _HomePageState extends State<YourPost> {
#override
void initState() {
super.initState();
}
Future ApiUserPost() async {
final String url = '*************';
var response = await http.post(Uri.parse(url));
var responsebody = jsonDecode(response.body);
if (responsebody.length > 0) {
return responsebody;
} else {
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Container(
child: SingleChildScrollView(
child: Column(
children: <Widget>[
FutureBuilder(
future: ApiUserPost(),
builder: (context, AsyncSnapshot snapshot) {
if (snapshot.hasData) {
return ListView.builder(
physics: ScrollPhysics(),
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: snapshot.data.length.clamp(0, 6),
itemBuilder: (context, index) {
return Card(
// elevation: 1,
child: Container(
padding: EdgeInsets.all(6),
child: Row(
children: <Widget>[
Flexible(
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
MergeSemantics(
child: Row(
children: <Widget>[
Flexible(
child: Text(
"${snapshot.data[index]['name']}",
),
)
],
),
),
SizedBox(height: 5),
],
),
)
],
),
),
);
});
} else if (snapshot.hasError) {
Center(
child: CircularProgressIndicator(
valueColor:
new AlwaysStoppedAnimation<Color>(Colors.black),
),);
}
return SizedBox(
height: MediaQuery.of(context).size.height / 1.3,
child: Center(
child: CircularProgressIndicator(
valueColor:
new AlwaysStoppedAnimation<Color>(Colors.black),
),
),
);
})
],
),
),
),
));
}
}
I think the main problem is that you're not indicating the generic types (Class)on some places. When you working with Futures and FutureBuilder you have to specify what type you're working with..
Future<TypeYouExpected> apiUserPost() async {
//Try to specify the type of the variables too
}
The FutureBuilder widget also has to know that type..
body: FutureBuilder<TypeYouExpected>(
future: apiUserPost(),
builder: ..
I am trying to navigate to a route and this exception happen. Have look at my code and I don't think I have a FAB and Hero inside this route. Is it because when you tap on each List item, it will show a dialog with Gridview on it? Someone care to explain to me how can this exception happened? It doesn't produce any error on user thought, just throw an exception.
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("Daftar Dokter")),
body: ListView.separated(
separatorBuilder: (BuildContext context, int i) => Divider(color: Colors.grey[400]),
itemCount: widget.data.length,
itemBuilder: (context, index) {
Doctor doctor = widget.data[index];
return InkWell(
onTap: (){
_buildDialog(context, scheduleService, doctor.doctorId);
},
child: Row(
children: <Widget>[
Padding(
padding: const EdgeInsets.all(8.0),
child: SizedBox(
width: 50,
height: 50,
child: Placeholder(),
),
),
Flexible(
child: SizedBox(
child: ListTile(
title: Text(doctor.name),
subtitle: Text(doctor.specializationName),
),
)
)
],
),
);
}
)
);
}
}
Hope it will solve your issue:
onItem Builder:
itemBuilder: (context, index) {
return Hero(
tag: "itemTag $index",
child: Material(
child: InkWell(
onTap: () {
// _buildDialog(context, scheduleService, doctor.doctorId);
Navigator.of(context).push(MaterialPageRoute(
builder: (context) => Wisgets(
tag: "itemTag $index",
)));
},
child: Row(
children: <Widget>[
Text("Item $index"),
],
),
),
),
);
},
Child Widget for row
class Wisgets extends StatelessWidget {
final String tag;
const Wisgets({Key? key, required this.tag}) : super(key: key);
#override
Widget build(BuildContext context) {
return Hero(
tag: tag,
child: Scaffold(
appBar: AppBar(
title: Text("Child"),
),
body: Column(
children: [
Text("got $tag"),
],
),
),
);
}
}
Hello friends I am learning to build apps in Flutter. I have a FutureBuilder widget which retrieves Data from the server and displays them.
Here is the code:
FutureBuilder(
future: fetchBoxes(),
builder: (BuildContext context,
AsyncSnapshot<List<Box>> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
return Text('no connection');
case ConnectionState.active:
case ConnectionState.waiting:
return Center(
child: CircularProgressIndicator(),
);
break;
case ConnectionState.done:
if (snapshot.hasError) {
return Text('error');
} else {
if (snapshot.hasData) {
return ListView.builder(
shrinkWrap: true,
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context,
int position) {
/* String price =
snapshot.data[position]['price'];*/
/* print(snapshot
.data[1].user_id);*/
// inspect(snapshot.data);
return Card();
and I want to implement it inside this Widget for getting scrollable widget:
My code :
#override
Widget build(BuildContext context) {
return SafeArea(
minimum: const EdgeInsets.only(
top: 20.0, right: 5.0, left: 5.0, bottom: 10.0),
child: Center(
child: Scaffold(
backgroundColor: Color(0xFFF6F7F8),
body: Stack(
children: [
Container(
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Container(
padding: EdgeInsets.all(10),
child: ElevatedButton.icon(
style: ElevatedButton.styleFrom(
primary: KBlue,
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(30))),
onPressed: () {
showDialog(
context: context,
builder: (BuildContext context) =>
_addNewBox(context),
);
},
label: Text(
'Ajouter un nouveau box',
style: TextStyle(color: Colors.white),
),
icon: Icon(
CommunityMaterialIcons.plus,
color: Colors.white,
),
),
);
How can I implement scrollable widget correctly?
Im trying to implement a non scrollable ListView builder here but can't seem to find how to do it. Reason is because i want everything to be scrollable and i dont want to have a Scrollable widget inside a scrollable parent.
class _DashboardState extends State<Dashboard> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('App Bar Here')),
body: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Hello World'),
Container(
child: ListView.builder(
itemBuilder: (context, index) {
return Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: <Widget>[
Container(
color: Color(0xffaaaaaa),
height: 20,
child: Text('Jss One')),
Text(
'English',
style: TextStyle(fontSize: 20),
),
],
),
),
);
},
itemCount: 50,
),
),],),));
}}
class _DashboardState extends State<Dashboard> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('App Bar Here')),
body: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Hello World'),
Container(
child: ListView.builder(
physics: NeverScrollableScrollPhysics() //add this line,
itemBuilder: (context, index) {
return Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: <Widget>[
Container(
color: Color(0xffaaaaaa),
height: 20,
child: Text('Jss One')),
Text(
'English',
style: TextStyle(fontSize: 20),
),
],
),
),
);
},
itemCount: 50,
),
),],),));
}}
set physics property to NeverScrollablePhysics() in order to not scroll the lisview
try using physics property of listview
physics: NeverScrollableScrollPhysics()
hope it helps..
The Solution to what i was going for.
What happens here is the ListBuilder widget will build a List of items not in a Scrollable widget. The parent widget itself is scrollable which makes the whole Screen scrollable. To do this, add shrinkWrap: true and physics: NeverScrollableScrollPhysics() to the ListView.builder() property.
class _DashboardState extends State<Dashboard> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('App Bar Here')),
body: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Hello World'),
Container(
child: ListView.builder(
shrinkWrap: true, //add this line
physics: NeverScrollableScrollPhysics() //add this line,
itemBuilder: (context, index) {
return Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: <Widget>[
Container(
color: Color(0xffaaaaaa),
height: 20,
child: Text('Jss One')),
Text(
'English',
style: TextStyle(fontSize: 20),
),
],
),
),
);
},
itemCount: 50,
),
),],),));
}}
I am trying to show a listview after some texts in a column. The text shows properly inside the first Row until I add a listview inside the next row. Everything disappears after adding the ListView.
Here is the Code:
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: <Widget>[
Row(
children: <Widget>[
Text(
"Prayer Time",
style: TextStyle(fontSize: 20, fontWeight:
FontWeight.normal),
),
],
),
Row(
children: <Widget>[myList()],
),
],
),
),
floatingActionButton: FloatingActionButton(
tooltip: 'Add Alarm',
child: Icon(Icons.add),
backgroundColor: const Color(0xff0A74C5),
),
);
}
Expanded myList() {
return Expanded(
child: ListView.builder(
itemBuilder: (context, position) {
return Card(
child: Text(androidVersionNames[position]),
);
},
itemCount: androidVersionNames.length,
)
);
}
}
change like this:
Expanded(
child: Row(
children: <Widget>[myList()],
),
),
Your ListView should have a fixed Size. Try to wrap the ListView inside a Container.
I run your code and fixed it. Replace your myList() with this code bellow:
Expanded myList() {
return Expanded(
child: Container(
width: double.infinity,
height: 200,
child: ListView.builder(
itemBuilder: (context, position) {
return Card(
child: Text(androidVersionNames[position]),
);
},
itemCount: androidVersionNames.length,
),
)
);
}