Unit-App/lib/main.dart

import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:http/http.dart';
import 'package:unitstocks/Util/Prefs.dart';
import 'package:unitstocks/login_page.dart';
import 'home_page.dart';
import 'stocking.dart';
import 'unit_details.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:location/location.dart';
import 'Util/Util.dart';


SharedPreferences prefs;
Location location = Location();
StreamSubscription locationStream;
LocationData currentPosisiton;
Util util = new Util();
Client http = new Client();
SecurityContext clientContext;

registerCert()async{
  ByteData bytes = await rootBundle.load('cert/isrgrootx1.pem');
  clientContext = new SecurityContext()
    ..setTrustedCertificatesBytes(bytes.buffer.asUint8List());
}

void main() async{
  // prefs = await SharedPreferences.getInstance();
  WidgetsFlutterBinding.ensureInitialized();
  SharedPreferences.getInstance().then((pref) async{
    prefs = pref;
    await prefs.setString(keyClass.hostAddress, "https://tbg.thamringroup.web.id/ords/tbs/unit/v1");
    await prefs.setString(keyClass.restTokenAddress, "https://tbg.thamringroup.web.id/ords/tbs/oauth/token");
  },
  onError: (error) {
    print("SharedPreferences ERROR = $error");
  });
  // if( prefs.getString(keyClass.hostAddress) ==null)
  await registerCert();
  // await FlutterLogs.initLogs(
  //     logLevelsEnabled: [
  //       LogLevel.INFO,
  //       LogLevel.WARNING,
  //       LogLevel.ERROR,
  //       LogLevel.SEVERE
  //     ],
  //     timeStampFormat: TimeStampFormat.TIME_FORMAT_READABLE,
  //     directoryStructure: DirectoryStructure.FOR_DATE,
  //     logTypesEnabled: ["device","network","errors"],
  //     logFileExtension: LogFileExtension.LOG,
  //     logsWriteDirectoryName: "MyLogs",
  //     logsExportDirectoryName: "MyLogs/Exported",
  //     debugFileOperations: true,
  //     isDebuggable: true);

  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
      .then((_) {
    runApp(new MyApp());
  });
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Unit Stock',
      theme: ThemeData(
        pageTransitionsTheme: PageTransitionsTheme(
            builders: {
              TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
            }
        ),
        primarySwatch: Colors.indigo,
      ),
      debugShowCheckedModeBanner: false,

      home: (prefs.getBool(keyClass.logged_in)??false)?HomePage(title:'Home Page'):LoginPage(),
      routes: {
        '/home': (context) => new HomePage(title:'Home Page'),
        '/stocking' : (context) => new Stocking(),
        '/unitdetails' : (context) => new UnitDetails(),
        '/login' :(context) => new LoginPage(),
      },
    );
  }
}