Flutter dropdown icon size customization. In this article, I will be discussing and implementing how to change Flutter dropdown icon size. I will be explaining each and everything step by step using a proper Flutter example code so you can have a better idea of how to change Flutter dropdown icon size. So without wasting anymore of your time, let’s just get right into changing the Flutter dropdown icon size.
What is Flutter Dropdown Icon Size?
Flutter dropdown icon size is the size of icon that you can see by default in the right side of the Flutter dropdown. In this post, we will change the size of this icon. Let’s start implementing it using proper Flutter example code.
Default Flutter Dropdown Icon Size
Let’s first see the default icon size of the Flutter dropdown button. For that we have defined a simple Flutter dropdown having two dropdown menu items. See the below code:
DropdownButton(
borderRadius:
BorderRadius.circular(20).copyWith(topLeft: Radius.circular(0)),
isExpanded: true,
hint: Text('Default icon size', style: TextStyle(fontSize: 15)),
value: categoryValue,
items: [
DropdownMenuItem(
value: 'Sports',
child: Text('Sports',
style: TextStyle(fontSize: 15, color: Colors.black45))),
DropdownMenuItem(
value: 'Tech',
child: Text('Tech',
style: TextStyle(fontSize: 15, color: Colors.black45))),
],
onChanged: (val) {
setState(() {
categoryValue = val.toString();
});
})
You can see in this image the default Flutter dropdown icon size.
Change Flutter Dropdown Icon Size
To change the Flutter dropdown icon size, we have to use the icon size constructor of the Flutter dropdown button widget. For demonstration, I have given it a value of 30, it takes a double value so you can also give a decimal value like 30.5 etc. See the below code:
iconSize: 30
Beautiful Flutter Dropdown Design Source Code
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Homepage(),
);
}
}
class Homepage extends StatefulWidget {
@override
State<Homepage> createState() => _HomepageState();
}
class _HomepageState extends State<Homepage> {
String? categoryValue;
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: Center(
child: Padding(
padding: EdgeInsets.all(20),
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(50).copyWith(
bottomRight: Radius.circular(0), topLeft: Radius.circular(0)),
color: Colors.blue.shade100),
child: DropdownButtonHideUnderline(
child: DropdownButton(
iconSize: 30,
borderRadius: BorderRadius.circular(20)
.copyWith(topLeft: Radius.circular(0)),
isExpanded: true,
hint: Text('Custom icon size', style: TextStyle(fontSize: 15)),
value: categoryValue,
items: [
DropdownMenuItem(
value: 'Sports',
child: Text('Sports',
style: TextStyle(fontSize: 15, color: Colors.black45))),
DropdownMenuItem(
value: 'Tech',
child: Text('Tech',
style: TextStyle(fontSize: 15, color: Colors.black45))),
],
onChanged: (val) {
setState(() {
categoryValue = val.toString();
});
}),
),
),
))));
}
}Conclusion
In conclusion, now you have a practical understanding of how to change Flutter dropdown icon size in Flutter dropdown. I would love to have your thoughts on this article. I also have written other amazing articles related to Flutter app development, Flutter widgets, Flutter animations, Flutter amazing templates and many more, links to some of these posts are listed below. Thanks for reading.
