For Explanation watch video
code
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: BMICalculator(),
);
}
}
class BMICalculator extends StatefulWidget {
const BMICalculator({super.key});
@override
State<BMICalculator> createState() => _BMICalculatorState();
}
class _BMICalculatorState extends State<BMICalculator> {
TextEditingController heightController = TextEditingController();
TextEditingController weightController = TextEditingController();
double bmi = 0.0;
bool showBmi = false;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('BMI Calculator'),
),
body: Container(
padding: EdgeInsets.all(20),
child: Column(
children: [
TextField(
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Enter Height in cm',
),
controller: heightController,
),
const SizedBox(
height: 20,
),
TextField(
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Enter Weight in KG',
),
controller: weightController,
),
const SizedBox(
height: 20,
),
ElevatedButton(
onPressed: () {
setState(() {
double height = double.parse(heightController.text);
double weight = double.parse(weightController.text);
bmi = (weight / (height * height)) * 10000;
showBmi = true;
});
},
child: Text(
'Calculate',
style: const TextStyle(
fontSize: 30,
),
),
),
const SizedBox(
height: 20,
),
showBmi
? Text(
"bmi: " + bmi.toStringAsFixed(2),
style: TextStyle(
fontSize: 30,
),
)
: const SizedBox(),
],
),
),
);
}
}
output :
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