//Attached function in a login view
Future<String?> login({
    required BuildContext context,
    required String email,
    required String password,
  }) async {
    try {
      var userId = await _authenticationService.login(
          context: context, email: email, password: password);
      await WriteCache.setString(key: "cache", value: userId!);
    } catch (e) {
      print(e); //Do something if error occurs
   }
 }
 
//Splash view
import 'dart:async';
import 'package:cache_manager/cache_manager.dart';
import 'package:flutter/material.dart';

class SplashView extends StatefulWidget {
  @override
  _SplashViewState createState() => _SplashViewState();
}

class _SplashViewState extends State<SplashView> {
  Future initiateCache() async {
    return CacheManagerUtils.conditionalCache(
        key: "cache",
        valueType: ValueType.StringValue,
        actionIfNull: () {
          Navigator.of(context).pushNamed(AppRoutes.LoginRoute);
        },
        actionIfNotNull: () {
          Navigator.of(context).pushNamed(AppRoutes.HomeRoute);
        });
  }

  @override
  void initState() {
    Timer(Duration(seconds: 1), initiateCache);
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text("demo app"),
      ),
    );
  }
}

//Home view
import 'package:cache_manager/core/cache_manager_utils.dart';
import 'package:cache_manager/core/delete_cache_service.dart';
import 'package:flutter/material.dart';

class HomeView extends StatefulWidget {
  @override
  _HomeViewState createState() => _HomeViewState();
}

class _HomeViewState extends State<HomeView> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: CacheManagerUtils.cacheTextBuilder(
            textStyle: TextStyle(color: Colors.white), cacheKey: "cache"),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          DeleteCache.deleteKey(
              "cache", Navigator.of(context).pushNamed(AppRoutes.LoginRoute));
        },
      ),
    );
  }
}