remove arc dialogs. create custom loading actions

src/Android/MainApplication.cs

@@ -1,5 +1,4 @@
 using System;
-using Acr.UserDialogs;
 using Android.App;
 using Android.Content;
 using Android.OS;
@@ -102,7 +101,6 @@ namespace Bit.Android
 
         public static void SetIoc(Application application)
         {
-            UserDialogs.Init(application);
             CachedImageRenderer.Init();
             ZXing.Net.Mobile.Forms.Android.Platform.Init();
             CrossFingerprint.SetCurrentActivityResolver(() => CrossCurrentActivity.Current.Activity);
@@ -160,7 +158,6 @@ namespace Bit.Android
             // Other
             container.RegisterSingleton(CrossSettings.Current);
             container.RegisterSingleton(CrossConnectivity.Current);
-            container.RegisterSingleton(UserDialogs.Instance);
             container.RegisterSingleton(CrossFingerprint.Current);
 
             // Push

src/Android/Services/DeviceActionService.cs

@@ -32,6 +32,7 @@ namespace Bit.Android.Services
         private readonly IAppSettingsService _appSettingsService;
         private bool _cameraPermissionsDenied;
         private DateTime? _lastAction;
+        private ProgressDialog _progressDialog;
 
         public DeviceActionService(
             IAppSettingsService appSettingsService)
@@ -419,5 +420,31 @@ namespace Bit.Android.Services
             intent.SetData(global::Android.Net.Uri.Parse("package:com.x8bit.bitwarden"));
             activity.StartActivity(intent);
         }
+
+        public void ShowLoading(string text)
+        {
+            if(_progressDialog != null)
+            {
+                HideLoading();
+            }
+
+            var activity = (MainActivity)CurrentContext;
+            _progressDialog = new ProgressDialog(activity);
+            _progressDialog.SetMessage(text);
+            _progressDialog.SetCancelable(true);
+            _progressDialog.Show();
+        }
+
+        public void HideLoading()
+        {
+            if(_progressDialog == null)
+            {
+                return;
+            }
+
+            _progressDialog.Dismiss();
+            _progressDialog.Dispose();
+            _progressDialog = null;
+        }
     }
 }