canvasing/lib/Screens/Splash/splash_screen.dart

import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:employee_selfservice_mobile/Screens/Login/login_screen.dart';
import 'package:employee_selfservice_mobile/Screens/Splash/loginstatus_post.dart';
import 'package:employee_selfservice_mobile/constants.dart';
import 'package:internet_connection_checker/internet_connection_checker.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> {
  late StreamSubscription subscription;
  bool isDeviceConnected = false;
  bool isAlertSet = false;

  @override
  void initState() {
    //getConnectivity();
    //Timer(Duration(seconds: 10), () => loginStatus(context));
    Timer(Duration(seconds: 10), () => Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => LoginView())));
    super.initState();
  }

  /*getConnectivity() =>
      subscription = Connectivity().onConnectivityChanged.listen(
            (ConnectivityResult result) async {
          isDeviceConnected = await InternetConnectionChecker().hasConnection;
          if (!isDeviceConnected && isAlertSet == false) {
            showConnectivityDialogBox();
            setState(() => isAlertSet = true);
          }
        },
      );*/

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

/*showConnectivityDialogBox() =>
      showCupertinoDialog<String>(
        context: context,
        builder: (BuildContext context) =>
            CupertinoAlertDialog(
              title: const Text('No Connection'),
              content: const Text('Please check your internet connectivity'),
              actions: <Widget>[
                Column(
                  children: [
                    SizedBox(
                      width: 250,
                      height: 250,
                      child: LottieBuilder.asset(
                        //'assets/animation/animation_no_internet.json',
                          'assets/animation/animation_no_internet_3.json',
                          repeat: true),
                    ),
                  ],
                ),
                TextButton(
                  onPressed: () async {
                    Navigator.pop(context, 'Cancel');
                    setState(() => isAlertSet = false);
                    isDeviceConnected =
                    await InternetConnectionChecker().hasConnection;
                    if (!isDeviceConnected && isAlertSet == false) {
                      showConnectivityDialogBox();
                      setState(() => isAlertSet = true);
                    }
                  },
                  child: const Text('Retry'),
                ),
              ],
            ),
      );*/
}

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

  @override
  Widget build(BuildContext context) {
    var size = MediaQuery.of(context).size;

    return Scaffold(
        body: Container(
          width: double.infinity,
          height: double.infinity,
          decoration: BoxDecoration(
              gradient: LinearGradient(
                  begin: Alignment.topRight,
                  end: Alignment.bottomRight,
                  colors: [
                    Color(0xFF4858A7),
                    Color(0xFF4858A7),
                    Color(0xFF6474C6),
                    //Color(0xFF8C99DD),
                    //Color(0xFFFFFFFF)
                  ])),
          child: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Container(
                  /*decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: Colors.white
              ),*/
                  child: SizedBox(
                      width: size.width * 0.55,
                      //height: 250,
                      child: Image.asset('assets/animation/iconapp2.gif')
                    /*LottieBuilder.asset('assets/animation/animation_4.json',
                    repeat: true, ),*/
                  ),
                ),
                /* Text(appName,
                style: GoogleFonts.carterOne(fontSize: 25, 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) {
    version = "1.0.0";
    session = "";
    notif_token = "";

    if (Platform.isAndroid){
      device = "android";
    } else if (Platform.isIOS){
      device = "ios";
    }

  }

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

  LoginStatus_Post.connectToAPI(version!, device!, session, notif_token!).then((valueResult) async {
    Map<String, dynamic> object = json.decode(valueResult);
    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: () async {
                Uri url = Uri.parse(Uri.encodeFull("https://play.google.com/store/apps"));
                //final Uri uri = Uri(scheme: "https", host: "play.google.com");
                if(!await launchUrl(url, mode: LaunchMode.externalApplication)) {
                  throw "Can not launch url";
                }
              },
            );

            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(appName),
              content: Text(title + "\n" + message),
              actions: [noButton, okButton],

            );

            // show the dialog
            showDialog(
              context: context,
              barrierDismissible: false,
              builder: (BuildContext context) {
                return alert;
              },
            );
          } else if (block == "true") {
            Widget okButton = TextButton(
              child: Text(action),
              onPressed: () async {
                if (action == "update") {
                  _launchURL(Uri.parse("https://play.google.com/store/apps"));
                  SystemChannels.platform.invokeMethod('SystemNavigator.pop');
                  Uri url = Uri.parse(Uri.encodeFull("https://play.google.com/store/apps"));
                  //final Uri uri = Uri(scheme: "https",  host: "play.google.com");
                  if(!await launchUrl(url, mode: LaunchMode.externalApplication)) {
                    throw "Can not launch url";
                  }
                } else if (action == "close") {
                  SystemChannels.platform.invokeMethod('SystemNavigator.pop');
                }
              },
            );

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

            // show the dialog
            showDialog(
              context: context,
              barrierDismissible: false,
              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(appName),
    content: Text("Server Response Error"),
    actions: [
      noButton,
      okButton,
    ],
  );

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