bitwarden-android/src/Android/MainApplication.cs

using System;
using Acr.UserDialogs;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Bit.Android.Services;
using Bit.App.Abstractions;
using Bit.App.Repositories;
using Bit.App.Services;
using Microsoft.Practices.Unity;
using Plugin.Connectivity;
using Plugin.CurrentActivity;
using Plugin.Fingerprint;
using Plugin.Settings;
using PushNotification.Plugin;
using PushNotification.Plugin.Abstractions;
using XLabs.Ioc;
using XLabs.Ioc.Unity;
using System.Threading.Tasks;
using Plugin.Settings.Abstractions;
using Xamarin.Android.Net;

namespace Bit.Android
{
#if DEBUG
    [Application(Debuggable = true)]
#else
    [Application(Debuggable = false)]
#endif
    public class MainApplication : Application, Application.IActivityLifecycleCallbacks
    {
        private const string FirstLaunchKey = "firstLaunch";
        private const string LastVersionCodeKey = "lastVersionCode";

        public static Context AppContext;

        public MainApplication(IntPtr handle, JniHandleOwnership transer)
          : base(handle, transer)
        {
            // NOTE: This is just here to stop the linker from removing AndroidClientHandler references
            var handler = new AndroidClientHandler();

            if(!Resolver.IsSet)
            {
                SetIoc(this);
            }
        }

        public override void OnCreate()
        {
            base.OnCreate();

            // workaround for app compat bug
            // ref https://forums.xamarin.com/discussion/62414/app-resuming-results-in-crash-with-formsappcompatactivity
            Task.Delay(10).Wait();

            RegisterActivityLifecycleCallbacks(this);
            AppContext = ApplicationContext;
            StartPushService();
            HandlePushReregistration();
        }

        private void HandlePushReregistration()
        {
            var pushNotification = Resolver.Resolve<IPushNotification>();
            var settings = Resolver.Resolve<ISettings>();

            // Reregister for push token based on certain conditions
            // ref https://github.com/rdelrosario/xamarin-plugins/issues/65

            var reregister = false;

            // 1. First time starting the app after a new install
            if(settings.GetValueOrDefault(FirstLaunchKey, true))
            {
                settings.AddOrUpdateValue(FirstLaunchKey, false);
                reregister = true;
            }

            // 2. App version changed (installed update)
            var versionCode = Context.ApplicationContext.PackageManager.GetPackageInfo(Context.PackageName, 0).VersionCode;
            if(settings.GetValueOrDefault(LastVersionCodeKey, -1) != versionCode)
            {
                settings.AddOrUpdateValue(LastVersionCodeKey, versionCode);
                reregister = true;
            }

            // 3. In debug mode
            if(InDebugMode())
            {
                reregister = true;
            }

            // 4. Doesn't have a push token currently
            if(string.IsNullOrWhiteSpace(pushNotification.Token))
            {
                reregister = true;
            }

            if(reregister)
            {
                pushNotification.Unregister();
                if(Resolver.Resolve<IAuthService>().IsAuthenticated)
                {
                    pushNotification.Register();
                }
            }
        }

        private bool InDebugMode()
        {
#if DEBUG
            return true;
#else
            return false;
#endif
        }

        public override void OnTerminate()
        {
            base.OnTerminate();
            UnregisterActivityLifecycleCallbacks(this);
        }

        public void OnActivityCreated(Activity activity, Bundle savedInstanceState)
        {
            CrossCurrentActivity.Current.Activity = activity;
        }

        public void OnActivityDestroyed(Activity activity)
        {
        }

        public void OnActivityPaused(Activity activity)
        {
        }

        public void OnActivityResumed(Activity activity)
        {
            CrossCurrentActivity.Current.Activity = activity;
        }

        public void OnActivitySaveInstanceState(Activity activity, Bundle outState)
        {
        }

        public void OnActivityStarted(Activity activity)
        {
            CrossCurrentActivity.Current.Activity = activity;
        }

        public void OnActivityStopped(Activity activity)
        {
        }

        public static void StartPushService()
        {
            AppContext.StartService(new Intent(AppContext, typeof(PushNotificationService)));
            if(Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat)
            {
                PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext,
                    typeof(PushNotificationService)), 0);
                AlarmManager alarm = (AlarmManager)AppContext.GetSystemService(AlarmService);
                alarm.Cancel(pintent);
            }
        }

        public static void StopPushService()
        {
            AppContext.StopService(new Intent(AppContext, typeof(PushNotificationService)));
            if(Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat)
            {
                PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext,
                    typeof(PushNotificationService)), 0);
                AlarmManager alarm = (AlarmManager)AppContext.GetSystemService(AlarmService);
                alarm.Cancel(pintent);
            }
        }

        public static void SetIoc(Application application)
        {
            UserDialogs.Init(application);

            var container = new UnityContainer();

            container
                // Android Stuff
                .RegisterInstance(application.ApplicationContext)
                .RegisterInstance<Application>(application)
                // Services
                .RegisterType<IDatabaseService, DatabaseService>(new ContainerControlledLifetimeManager())
                .RegisterType<ISqlService, SqlService>(new ContainerControlledLifetimeManager())
                .RegisterType<ISecureStorageService, KeyStoreStorageService>(new ContainerControlledLifetimeManager())
                .RegisterType<ICryptoService, CryptoService>(new ContainerControlledLifetimeManager())
                .RegisterType<IKeyDerivationService, BouncyCastleKeyDerivationService>(new ContainerControlledLifetimeManager())
                .RegisterType<IAuthService, AuthService>(new ContainerControlledLifetimeManager())
                .RegisterType<IFolderService, FolderService>(new ContainerControlledLifetimeManager())
                .RegisterType<ILoginService, LoginService>(new ContainerControlledLifetimeManager())
                .RegisterType<ISyncService, SyncService>(new ContainerControlledLifetimeManager())
                .RegisterType<IClipboardService, ClipboardService>(new ContainerControlledLifetimeManager())
                .RegisterType<IPushNotificationListener, PushNotificationListener>(new ContainerControlledLifetimeManager())
                .RegisterType<IAppIdService, AppIdService>(new ContainerControlledLifetimeManager())
                .RegisterType<IPasswordGenerationService, PasswordGenerationService>(new ContainerControlledLifetimeManager())
                .RegisterType<IReflectionService, ReflectionService>(new ContainerControlledLifetimeManager())
                .RegisterType<ILockService, LockService>(new ContainerControlledLifetimeManager())
                .RegisterType<IAppInfoService, AppInfoService>(new ContainerControlledLifetimeManager())
                .RegisterType<IGoogleAnalyticsService, GoogleAnalyticsService>(new ContainerControlledLifetimeManager())
                .RegisterType<IDeviceInfoService, DeviceInfoService>(new ContainerControlledLifetimeManager())
                .RegisterType<ILocalizeService, LocalizeService>(new ContainerControlledLifetimeManager())
                .RegisterType<ILogService, LogService>(new ContainerControlledLifetimeManager())
                .RegisterType<IHttpService, HttpService>(new ContainerControlledLifetimeManager())
                .RegisterType<ITokenService, TokenService>(new ContainerControlledLifetimeManager())
                .RegisterType<ISettingsService, SettingsService>(new ContainerControlledLifetimeManager())
                .RegisterType<IMemoryService, MemoryService>(new ContainerControlledLifetimeManager())
                // Repositories
                .RegisterType<IFolderRepository, FolderRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<IFolderApiRepository, FolderApiRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<ILoginRepository, LoginRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<ILoginApiRepository, LoginApiRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<IConnectApiRepository, ConnectApiRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<IDeviceApiRepository, DeviceApiRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<IAccountsApiRepository, AccountsApiRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<ICipherApiRepository, CipherApiRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<ISettingsRepository, SettingsRepository>(new ContainerControlledLifetimeManager())
                .RegisterType<ISettingsApiRepository, SettingsApiRepository>(new ContainerControlledLifetimeManager())
                // Other
                .RegisterInstance(CrossSettings.Current, new ContainerControlledLifetimeManager())
                .RegisterInstance(CrossConnectivity.Current, new ContainerControlledLifetimeManager())
                .RegisterInstance(UserDialogs.Instance, new ContainerControlledLifetimeManager())
                .RegisterInstance(CrossFingerprint.Current, new ContainerControlledLifetimeManager());

            CrossPushNotification.Initialize(container.Resolve<IPushNotificationListener>(), "962181367620");
            container.RegisterInstance(CrossPushNotification.Current, new ContainerControlledLifetimeManager());

            Resolver.SetResolver(new UnityResolver(container));
            CrossFingerprint.SetCurrentActivityResolver(() => CrossCurrentActivity.Current.Activity);
        }
    }
}