canvasing/lib/Screens/Splash/splash_screen.dart

import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:hris_selfservice_mobile/Screens/Login/login_screen.dart';
import 'package:hris_selfservice_mobile/Screens/Splash/loginstatus_post.dart';
import 'package:lottie/lottie.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../Home/home_screen.dart';
import '../Splash/background.dart';
import 'package:url_launcher/url_launcher.dart';
import 'dart:developer' as logDev;

class Splash extends StatefulWidget {
  const Splash({Key? key}) : super(key: key);

  @override
  _SplashState createState() => _SplashState();
}

class _SplashState extends State<Splash> {
  @override
  void initState() {
    super.initState();
    Timer(Duration(seconds: 10), () => loginStatus(context));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        resizeToAvoidBottomInset: false,
        body: Stack(
          children: <Widget>[
            Background(),
            SplashScreen(),
          ],
        ));
  }
}

class SplashScreen extends StatelessWidget {
  const SplashScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Container(
      width: double.infinity,
      height: double.infinity,
      decoration: BoxDecoration(
          gradient: LinearGradient(
              begin: Alignment.topRight,
              end: Alignment.bottomRight,
              colors: [
            Color(0xFFD21404),
            Color(0xFFFD7267),
          ])),
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Container(
              /*decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: Colors.white
              ),*/
              child: SizedBox(
                width: 250,
                height: 250,
                child: LottieBuilder.asset('assets/animation/animation_4.json',
                    repeat: true),
              ),
            ),
            Text('Employee Self Service',
                style: GoogleFonts.knewave(fontSize: 22, color: Colors.white))
          ],
        ),
      ),
    ));
  }
}

Future<void> loginStatus(BuildContext context) async {
  final SharedPreferences prefs = await SharedPreferences.getInstance();
  String? version = prefs.getString('version');
  String? device = prefs.getString('device');
  String? session = prefs.getString('session');
  String? notif_token = prefs.getString('notif_token');

  if (session == null) {
    session = "";
    version = "";
    device = "";
    notif_token = "";
  }

  logDev.log(session, name: "SESSIONNYA");

  LoginStatus_Post.connectToAPI(version!, device!, session, notif_token!)
      .then((valueResult) async {
    Map<String, dynamic> object = json.decode(valueResult);
    logDev.log(valueResult, name: "LOGIN STATUS!");
    if (object.containsKey("result").toString() == "true") {
      String status = object['result']['status'].toString();
      if (status == "success") {
        Fluttertoast.showToast(
            msg: "You are already logged in",
            toastLength: Toast.LENGTH_SHORT,
            gravity: ToastGravity.CENTER,
            timeInSecForIosWeb: 1,
            textColor: Colors.white,
            fontSize: 16.0);
        Navigator.pushReplacement(
            context, MaterialPageRoute(builder: (context) => HomeView()));
      } else if (status == "failed") {
        String message = object['result']['message'].toString();
        if (message == "Not Logged In") {
          Fluttertoast.showToast(
              msg: message,
              toastLength: Toast.LENGTH_SHORT,
              gravity: ToastGravity.CENTER,
              timeInSecForIosWeb: 1,
              textColor: Colors.white,
              fontSize: 16.0);
          Navigator.pushReplacement(
              context, MaterialPageRoute(builder: (context) => LoginView()));
        } else {
          String title = object['result']['title'].toString();
          String action = object['result']['action'].toString();
          String block = object['result']['block'].toString();
          if (block == "false") {
            Widget okButton = TextButton(
              child: Text(action),
              onPressed: () {
                _launchURL(Uri.parse("https://play.google.com/store/apps"));
                SystemChannels.platform.invokeMethod('SystemNavigator.pop');
              },
            );

            Widget noButton = TextButton(
              child: Text("Later"),
              onPressed: () {
                if (session == ""){
                  Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => LoginView()));
                } else {
                  Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => HomeView()));
                }
              },
            );

            // set up the AlertDialog
            AlertDialog alert = AlertDialog(
              title: Text("Employee Self Service"),
              content: Text(title + "\n" + message),
              actions: [noButton, okButton],
            );

            // show the dialog
            showDialog(
              context: context,
              builder: (BuildContext context) {
                return alert;
              },
            );
          } else if (block == "true") {
            Widget okButton = TextButton(
              child: Text(action),
              onPressed: () {
                if (action == "update") {
                  _launchURL(Uri.parse("https://play.google.com/store/apps"));
                  SystemChannels.platform.invokeMethod('SystemNavigator.pop');
                } else if (action == "close") {
                  SystemChannels.platform.invokeMethod('SystemNavigator.pop');
                }
              },
            );

            // set up the AlertDialog
            AlertDialog alert = AlertDialog(
              title: Text("Employee Self Service"),
              content: Text(title + "\n" + message),
              actions: [okButton],
            );

            // show the dialog
            showDialog(
              context: context,
              builder: (BuildContext context) {
                return alert;
              },
            );
          }
        }
      }
    } else {
      alertDialogFailedResponse(context);
      /*Fluttertoast.showToast(
          msg: "Server Response Error",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER,
          timeInSecForIosWeb: 1,
          textColor: Colors.white,
          fontSize: 16.0);*/
    }
  });
}

_launchURL(Uri url) async {
  if (await canLaunchUrl(url)) {
    await launchUrl(url);
  } else {
    throw 'Could not launch $url';
  }
}

alertDialogFailedResponse(BuildContext context){
  Widget okButton = TextButton(
    child: Text("Refresh"),
    onPressed: () {
      Navigator.of(context, rootNavigator: true).pop();
      Navigator.pushReplacement(context, MaterialPageRoute(
          builder: (context) => SplashScreen()));
    },
  );

  Widget noButton = TextButton(
    child: Text("Back"),
    onPressed: () {
      Navigator.of(context, rootNavigator: true).pop();
      Navigator.pop(context);

    },
  );

  // set up the AlertDialog
  AlertDialog alert = AlertDialog(
    title: Text("Employee Self Service"),
    content: Text("Server Response Error"),
    actions: [
      noButton,
      okButton,
    ],
  );

  // show the dialog
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return alert;
    },
  );
}