Horizontal Progress Bar Linear Progress Indicator Using Flutter

import 'package:flutter/material.dart';

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
        home: Scaffold(
            appBar: AppBar(
              backgroundColor: Color(0xFF43A047),
                title: Text('Horizontal Progress Bar')
            ),
            body: Center(
                child: Progress()
            )
        )
    );
  }
}

class Progress extends StatefulWidget {
  @override
  ProgressState createState() => new ProgressState();
}

class ProgressState extends State<Progress>
    with SingleTickerProviderStateMixin {
  AnimationController controller;
  Animation animation;
  double beginAnim = 0.0 ;
  double endAnim = 1.0 ;

  @override
  void initState() {
    super.initState();
    controller = AnimationController(
        duration: const Duration(seconds: 5), vsync: this);
    animation = Tween(begin: beginAnim, end: endAnim).animate(controller)
      ..addListener(() {
        setState(() {
          // Change here any Animation object value.
        });
      });
  }

  @override
  void dispose() {
    controller.stop();
    super.dispose();
  }

  startProgress(){
    controller.forward();
  }

  stopProgress(){
    controller.stop();
  }

  resetProgress(){
    controller.reset();
  }

  @override
  Widget build(BuildContext context) {
    return Center(
        child: Column(children: [
          Container(
              padding: EdgeInsets.all(20.0),
              child: LinearProgressIndicator(
                value: animation.value,
              )),

          RaisedButton(
            child: Text(" Start Progress "),
            onPressed: startProgress,
            color:  Color(0xFF43A047),
            textColor: Colors.white,
            splashColor: Colors.grey,
            padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
          ),

          RaisedButton(
            child: Text(" Stop Progress "),
            onPressed: stopProgress,
            color: Color(0xFF43A047),
            textColor: Colors.white,
            splashColor: Colors.grey,
            padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
          ),

          RaisedButton(
            child: Text(" Reset Progress "),
            onPressed: resetProgress,
            color:  Color(0xFF43A047),
            textColor: Colors.white,
            splashColor: Colors.grey,
            padding: EdgeInsets.fromLTRB(10, 10, 10, 10),
          )
        ]
        ));
  }
}