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BMI CALCULATOR USING FLUTTER || FLUTTER IMPLEMENTATION

 

A Body Mass Index (BMI) calculator is an application that helps determine an individual's body weight status based on their height and weight. Here is an example implementation of a BMI calculator using Flutter:

 

import 'package:flutter/material.dart';

 

void main() {

  runApp(const MyApp());

}

 

class MyApp extends StatelessWidget{

  const MyApp({Key? key}) : super(key: key);

 

  @override

  Widget build(BuildContext context){

    return MaterialApp(

      title: 'Flutter Demo',

      debugShowCheckedModeBanner: false,

      theme: ThemeData(

        primarySwatch: Colors.cyan,

      ),

      home: const MyHomePage(),

    );

  }

}

 

class MyHomePage extends StatefulWidget {

  const MyHomePage({Key? key}) : super(key: key);

 

  @override

  State<MyHomePage> createState() => _MyHomePageState();

}

 

class _MyHomePageState extends State<MyHomePage> {

 

  var wtController = TextEditingController();

  var ftController = TextEditingController();

  var inController = TextEditingController();

  var result = "";

 

  @override

  Widget build(BuildContext context) {

 

    return Scaffold(

      appBar: AppBar(

 

        title: Text('BMI Calculator'),

      ),

      body: Center(

        child: Container(

          width: 300,

          child: Column(

            mainAxisAlignment: MainAxisAlignment.center,

            children: [

              Text('BMI', style:TextStyle(

                fontSize: 34, fontWeight: FontWeight.w700

              ),),

 

              SizedBox(height: 21,),

 

              TextField(

                controller: wtController,

                decoration: InputDecoration(

                  label: Text('Weight (in kg)'),

                  prefixIcon: Icon(Icons.line_weight),

                ),

                keyboardType: TextInputType.number,

              ),

 

              SizedBox(height: 11,),

 

              TextField(

                controller: ftController,

                decoration: InputDecoration(

                  label: Text('Height in feet'),

                  prefixIcon: Icon(Icons.height),

                ),

                keyboardType: TextInputType.number,

              ),

 

              SizedBox(height: 11,),

 

              TextField(

                controller: inController,

                decoration: InputDecoration(

                  label: Text('Height in inches'),

                  prefixIcon: Icon(Icons.height),

                ),

                keyboardType: TextInputType.number,

              ),

 

              SizedBox(height: 21,),

 

              ElevatedButton(onPressed: (){

 

                var wt = wtController.text.toString();

                var ft = ftController.text.toString();

                var inch = inController.text.toString();

 

                if(wt !="" && ft!="" && inch !=""){

 

                  var iwt = int.parse(wt);

                  var ift = int.parse(ft);

                  var iinch = int.parse(inch);

 

                  var tinch = (ift * 12) + iinch;

                  var tcm = tinch * 2.54;

                  var tm = tcm / 100;

 

                  var bmi = iwt/(tm * tm);

 

                  var msg = "";

 

                  if(bmi>25){

                    msg = "You are Over Weight :(";

                  }else if(bmi<18){

                    msg = "You are Underweight :(";

                  }else{

                    msg = "You are Healthy :)";

                  }

 

                  setState(() {

                    result = "$msg \n Your BMI is: ${bmi.toStringAsFixed(2)} ";

                  });

                }else{

                  setState((){

                    result = "All Fields Required!!";

                  });

 

                }

              },

 

 

                  child:Text('Calculate')),

 

              SizedBox(height:11,),

 

              Text(result, style: TextStyle(fontSize: 19),),

 

            ],

          ),

        ),

      )

    );

  }

}

 

 




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