Asset-App/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'home.dart';
import 'stocking.dart';
import 'asset_logs.dart';
import 'package:image_picker/image_picker.dart';
import 'asset_details.dart';
import 'util/utils.dart';
import 'package:shared_preferences/shared_preferences.dart';


final picker = ImagePicker();
Util util = new Util();
SharedPreferences prefs;
void main()async {
  WidgetsFlutterBinding.ensureInitialized();
  prefs = await SharedPreferences.getInstance();
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
      .then((_) {
    runApp(new MyApp());
  });
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      debugShowMaterialGrid: false,
      title: 'AssetStocks',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: Home(),
      routes: {
        '/home': (context) => new Home(),
        '/stocking': (context) => new Stocking(),
        '/details': (context) => new AssetDetails(),
        '/logs' : (context) => new AssetLogs(),
      },
    );
  }
}