update background events

Music.UWP/App.xaml.cs

@@ -90,24 +90,38 @@ namespace Music
         {
             _isInBackgroundMode = false;
 
-            // Reastore view content if it was previously unloaded.
-            if (Window.Current.Content == null)
+            // Restore view content if it was previously unloaded.
+            if (Window.Current != null && Window.Current.Content == null)
             {
                 CreateRootFrame(ApplicationExecutionState.Running, string.Empty);
             }
+
             Debug.WriteLine("Leaving Background");
         }
 
         private void App_EnteredBackground(object sender, EnteredBackgroundEventArgs e)
         {
-            _isInBackgroundMode = true;
             Debug.WriteLine("Entered Background");
-            ReduceMemoryUsage(0);
+            var deferral = e.GetDeferral();
+            try
+            {
+                _isInBackgroundMode = true;
+#if DEBUG
+                //If we are in debug mode free memory here because the memory limits are turned off
+                //In release builds defer the actual reduction of memory to the limit changing event so we don't 
+                //unnecessarily throw away the UI
+                ReduceMemoryUsage(0);
+#endif
+            }
+            finally
+            {
+                deferral.Complete();
+            }
         }
 
         public void ReduceMemoryUsage(ulong limit)
         {
-            if (_isInBackgroundMode && Window.Current.Content != null)
+            if (_isInBackgroundMode && Window.Current != null && Window.Current.Content != null)
             {
                 ApplicationData.Current.LocalSettings.Values["navState"] = (Window.Current.Content as Frame).GetNavigationState();
 

Music.UWP/Music.UWP.csproj

@@ -19,7 +19,7 @@
     <PackageCertificateKeyFile>Music_TemporaryKey.pfx</PackageCertificateKeyFile>
     <AppxAutoIncrementPackageRevision>True</AppxAutoIncrementPackageRevision>
     <AppxBundle>Always</AppxBundle>
-    <AppxBundlePlatforms>x86</AppxBundlePlatforms>
+    <AppxBundlePlatforms>x86|x64|arm</AppxBundlePlatforms>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
     <DebugSymbols>true</DebugSymbols>

Music.UWP/Package.appxmanifest

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:uap3="http://schemas.microsoft.com/appx/manifest/uap/windows10/3" IgnorableNamespaces="uap mp uap3">
-  <Identity Name="835bc6b5-3b58-4669-9d8a-15cb9b49fa94" Publisher="CN=nikola" Version="1.0.3.0" />
+  <Identity Name="835bc6b5-3b58-4669-9d8a-15cb9b49fa94" Publisher="CN=nikola" Version="1.0.5.0" />
   <mp:PhoneIdentity PhoneProductId="835bc6b5-3b58-4669-9d8a-15cb9b49fa94" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
   <Properties>
     <DisplayName>Music</DisplayName>