show activity indicator while still loading

src/App/Pages/BaseContentPage.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace Bit.App.Pages
+{
+    public class BaseContentPage : ContentPage
+    {
+        protected void SetActivityIndicator()
+        {
+            Content = new ActivityIndicator
+            {
+                IsRunning = true,
+                VerticalOptions = LayoutOptions.CenterAndExpand,
+                HorizontalOptions = LayoutOptions.Center
+            };
+        }
+
+        protected async Task LoadOnAppearedAsync(View viewToSet, bool fromModal, Func<Task> workFunction)
+        {
+            async Task LoadAsync()
+            {
+                await workFunction.Invoke();
+                if(viewToSet != null)
+                {
+                    Content = viewToSet;
+                }
+            }
+            if(Device.RuntimePlatform == Device.iOS)
+            {
+                await LoadAsync();
+                return;
+            }
+            await Task.Run(async () =>
+            {
+                await Task.Delay(fromModal ? 400 : 200);
+                Device.BeginInvokeOnMainThread(async () => await LoadAsync());
+            });
+        }
+    }
+}

src/App/Pages/Vault/ViewPage.xaml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8" ?>
-<ContentPage 
+<pages:BaseContentPage 
     xmlns="http://xamarin.com/schemas/2014/forms"
     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
     x:Class="Bit.App.Pages.ViewPage"
@@ -27,7 +27,7 @@
         </ResourceDictionary>
     </ContentPage.Resources>
 
-    <ScrollView>
+    <ScrollView x:Name="_scrollView">
         <StackLayout Spacing="20">
             <StackLayout StyleClass="box">
                 <StackLayout StyleClass="box-row-header">
@@ -592,4 +592,4 @@
         </StackLayout>
     </ScrollView>
 
-</ContentPage>
+</pages:BaseContentPage>

src/App/Pages/Vault/ViewPage.xaml.cs

@@ -1,16 +1,10 @@
 using Bit.Core.Abstractions;
 using Bit.Core.Utilities;
-using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Xamarin.Forms;
-using Xamarin.Forms.Xaml;
 
 namespace Bit.App.Pages
 {
-    public partial class ViewPage : ContentPage
+    public partial class ViewPage : BaseContentPage
     {
         private readonly IBroadcasterService _broadcasterService;
         private ViewPageViewModel _vm;
@@ -22,9 +16,10 @@ namespace Bit.App.Pages
             _vm = BindingContext as ViewPageViewModel;
             _vm.Page = this;
             _vm.CipherId = cipherId;
+            SetActivityIndicator();
         }
 
-        protected async override void OnAppearing()
+        protected override async void OnAppearing()
         {
             base.OnAppearing();
             _broadcasterService.Subscribe(nameof(ViewPage), async (message) =>
@@ -42,7 +37,7 @@ namespace Bit.App.Pages
                     }
                 }
             });
-            await _vm.LoadAsync();
+            await LoadOnAppearedAsync(_scrollView, true, () => _vm.LoadAsync());
         }
 
         protected override void OnDisappearing()