alert.dart

// inside main.dart

import 'package:flutter/material.dart';
import './home.dart';

void main(){
  runApp(MaterialApp(
    title: "Exploring UI Widgets",
    debugShowCheckedModeBanner: false,
    home: Scaffold(
      appBar: AppBar(
        title: Center(child: Text("UI Widgets",
        style: TextStyle(
          fontFamily: 'Roboto',
              fontWeight: FontWeight.w700
        ),
        textAlign: TextAlign.center,

        )
        ),
        backgroundColor: Colors.indigoAccent,
      ),
      body: Home(),
    ),

  ));
}



// inside home.dart
import 'package:flutter/material.dart';

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Container(
        padding: EdgeInsets.only(left: 10.0, top: 40.0),
        alignment: Alignment.center,
        child: Column(
          children: <Widget>[
            Row(
              children: <Widget>[
                Expanded(
                    child: Text(
                  "Spice Jet",
                  textDirection: TextDirection.ltr,
                  style: TextStyle(
                      fontSize: 33.0,
                      color: Colors.blueAccent,
                      decoration: TextDecoration.none,
                      fontFamily: 'Raleway',
                      fontWeight: FontWeight.w600),
                )),
//                EdgeInsets.only(top:10.0),
                Expanded(
                    child: Text(
                  "From Mumbai to New Delhi via Bangalore",
                  textDirection: TextDirection.ltr,
                  style: TextStyle(
                      fontSize: 15.0,
                      color: Colors.blueAccent,
                      decoration: TextDecoration.none,
                      fontFamily: 'Raleway',
                      fontWeight: FontWeight.w600),
                )),
              ],
            ),
            Row(
              children: <Widget>[
                Expanded(
                    child: Text(
                  "Spice Jet",
                  textDirection: TextDirection.ltr,
                  style: TextStyle(
                      fontSize: 33.0,
                      color: Colors.blueAccent,
                      decoration: TextDecoration.none,
                      fontFamily: 'Raleway',
                      fontWeight: FontWeight.w600),
                )),
                Expanded(
                    child: Text(
                  "From Jaipur to Goa",
                  textDirection: TextDirection.ltr,
                  style: TextStyle(
                      fontSize: 15.0,
                      color: Colors.blueAccent,
                      decoration: TextDecoration.none,
                      fontFamily: 'Raleway',
                      fontWeight: FontWeight.w600),
                )),
              ],
            ),
            FlightImageAsset(),
            FlightBookButon()
          ],
        ),

        color: Colors.amberAccent,
//        width:100.0,
//        height: 200.0,
//        margin: EdgeInsets.all(20.0),
//        padding: EdgeInsets.all(20.0),
      ),
    );
  }
}

class FlightImageAsset extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    AssetImage assetImage = AssetImage("images/tenor.gif");
    Image image = Image(image: assetImage, width: 250.0);
    return Container(
      child: image,
      padding: EdgeInsets.all(20.0),
    );
  }
}

class FlightBookButon extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
        width: 250.0,
        height: 50.0,
        margin: EdgeInsets.only(top: 30.0),
        child: RaisedButton(
          color: Colors.deepOrange,
          child: Text(
            "Book your flight",
            style: TextStyle(
              fontFamily: "Raleway",
              fontWeight: FontWeight.w700,
              color: Colors.white,
              fontSize: 25.0
            ),

          ),
          onPressed: () {
            // no action
            bookFlight(context);
          },
          elevation: 12,
        ));
  }
}

void bookFlight(BuildContext context)
{
  var alertDialogue= AlertDialog(
    title: Text(("Flight Booked Successfully"),
    style: TextStyle(
      fontFamily: "Raleway",
          fontWeight: FontWeight.w700,
          fontSize: 15.0
    ),
    ),
    content: FlightImageAsset(),
  );

  showDialog(context: context,
  builder: (BuildContext context){
    return alertDialogue;
  }
  );
}