How To Use Future Api In Flutter With Code Example In Android App

import 'dart:async';
import 'package:flutter/material.dart';
void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Transform',
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _isLoading = false;

  initApp() async {
    setState(() => _isLoading = true);
    Future.delayed(Duration(seconds: 6)).then((_) {
      setState(() => _isLoading = false);
    });
  }

  @override
  void initState() {
    super.initState();
    initApp();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.amber,
          title: Text("Future Example")),
      body: Center(
          child: _isLoading
              ? CircularProgressIndicator()
              : Text("Future Completed!",
              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold,color: Colors.white))),
    );
  }
}