How to work with progress indicator in flutter?

Question

I\'m newbie in flutter and wanted to know what is better way to add CircularProgressIndicator in my layout. For example, my login view. This view have username,

Answer 1

This is my solution with stack

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'dart:async';

final themeColor = new Color(0xfff5a623);
final primaryColor = new Color(0xff203152);
final greyColor = new Color(0xffaeaeae);
final greyColor2 = new Color(0xffE8E8E8);

class LoadindScreen extends StatefulWidget {
  LoadindScreen({Key key, this.title}) : super(key: key);
  final String title;
  @override
  LoginScreenState createState() => new LoginScreenState();
}

class LoginScreenState extends State {
  SharedPreferences prefs;

  bool isLoading = false;

  Future handleSignIn() async {
    setState(() {
      isLoading = true;
    });
    prefs = await SharedPreferences.getInstance();
    var isLoadingFuture = Future.delayed(const Duration(seconds: 3), () {
      return false;
    });
    isLoadingFuture.then((response) {
      setState(() {
        isLoading = response;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(
            widget.title,
            style: TextStyle(color: primaryColor, fontWeight: FontWeight.bold),
          ),
          centerTitle: true,
        ),
        body: Stack(
          children: [
            Center(
              child: FlatButton(
                  onPressed: handleSignIn,
                  child: Text(
                    'SIGN IN WITH GOOGLE',
                    style: TextStyle(fontSize: 16.0),
                  ),
                  color: Color(0xffdd4b39),
                  highlightColor: Color(0xffff7f7f),
                  splashColor: Colors.transparent,
                  textColor: Colors.white,
                  padding: EdgeInsets.fromLTRB(30.0, 15.0, 30.0, 15.0)),
            ),

            // Loading
            Positioned(
              child: isLoading
                  ? Container(
                      child: Center(
                        child: CircularProgressIndicator(
                          valueColor: AlwaysStoppedAnimation(themeColor),
                        ),
                      ),
                      color: Colors.white.withOpacity(0.8),
                    )
                  : Container(),
            ),
          ],
        ));
  }
}