Make forms app static

Samples/Samples.Android/MainActivity.cs

@@ -14,6 +14,8 @@ namespace Samples.Droid
         Categories = new[] { Intent.CategoryDefault })]
     public class MainActivity : Xamarin.Forms.Platform.Android.FormsAppCompatActivity
     {
+        static App formsApp;
+
         protected override void OnCreate(Bundle bundle)
         {
             TabLayoutResource = Resource.Layout.Tabbar;
@@ -27,7 +29,7 @@ protected override void OnCreate(Bundle bundle)
 
             Xamarin.Essentials.Platform.ActivityStateChanged += Platform_ActivityStateChanged;
 
-            LoadApplication(new App());
+            LoadApplication(formsApp ??= new App());
         }
 
         protected override void OnResume()

Samples/Samples.Mac/AppDelegate.cs

@@ -9,6 +9,8 @@ namespace Samples.Mac
     [Register(nameof(AppDelegate))]
     public class AppDelegate : FormsApplicationDelegate
     {
+        static App formsApp;
+
         NSWindow window;
 
         public AppDelegate()
@@ -32,7 +34,7 @@ public override void DidFinishLaunching(NSNotification notification)
         {
             Forms.Init();
 
-            LoadApplication(new App());
+            LoadApplication(formsApp ??= new App());
 
             base.DidFinishLaunching(notification);
         }

Samples/Samples.Tizen/Program.cs

@@ -5,11 +5,13 @@ namespace Samples.Tizen
 {
     class Program : FormsApplication
     {
+        static App formsApp;
+
         protected override void OnCreate()
         {
             base.OnCreate();
 
-            LoadApplication(new App());
+            LoadApplication(formsApp ??= new App());
         }
 
         static void Main(string[] args)

Samples/Samples.UWP/MainPage.xaml.cs

@@ -4,13 +4,15 @@ namespace Samples.UWP
 {
     public sealed partial class MainPage : Xamarin.Forms.Platform.UWP.WindowsPage
     {
+        static Samples.App formsApp;
+
         public MainPage()
         {
             InitializeComponent();
 
             Platform.MapServiceToken = "RJHqIE53Onrqons5CNOx~FrDr3XhjDTyEXEjng-CRoA~Aj69MhNManYUKxo6QcwZ0wmXBtyva0zwuHB04rFYAPf7qqGJ5cHb03RCDw1jIW8l";
 
-            LoadApplication(new Samples.App());
+            LoadApplication(formsApp ??= new Samples.App());
         }
     }
 }

Samples/Samples.iOS/AppDelegate.cs

@@ -9,13 +9,15 @@ namespace Samples.iOS
     [Register(nameof(AppDelegate))]
     public partial class AppDelegate : Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
     {
+        static App formsApp;
+
         public override bool FinishedLaunching(UIApplication app, NSDictionary options)
         {
             Xamarin.Forms.Forms.Init();
             Xamarin.Forms.FormsMaterial.Init();
 
             Distribute.DontCheckForUpdatesInDebug();
-            LoadApplication(new App());
+            LoadApplication(formsApp ??= new App());
 
             return base.FinishedLaunching(app, options);
         }