加入專案檔案。

HiTA.Android/Assets/AboutAssets.txt

@@ -0,0 +1,19 @@
+Any raw assets you want to be deployed with your application can be placed in
+this directory (and child directories) and given a Build Action of "AndroidAsset".
+
+These files will be deployed with your package and will be accessible using Android's
+AssetManager, like this:
+
+public class ReadAsset : Activity
+{
+    protected override void OnCreate (Bundle bundle)
+    {
+        base.OnCreate (bundle);
+
+        InputStream input = Assets.Open ("my_asset.txt");
+    }
+}
+
+Additionally, some Android functions will automatically load asset files:
+
+Typeface tf = Typeface.CreateFromAsset (Context.Assets, "fonts/samplefont.ttf");

HiTA.Android/HiTA.Android.csproj

@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{35B3EBB9-6BBF-4478-8245-DA7189B55386}</ProjectGuid>
+    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{6968b3a4-1835-46a3-ac5c-1ae33b475983}</TemplateGuid>
+    <OutputType>Library</OutputType>
+    <RootNamespace>HiTA.Droid</RootNamespace>
+    <AssemblyName>HiTA.Android</AssemblyName>
+    <Deterministic>True</Deterministic>
+    <AndroidApplication>True</AndroidApplication>
+    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
+    <AndroidResgenClass>Resource</AndroidResgenClass>
+    <AndroidManifest>Properties\AndroidManifest.xml</AndroidManifest>
+    <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
+    <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
+    <AndroidUseLatestPlatformSdk>false</AndroidUseLatestPlatformSdk>
+    <TargetFrameworkVersion>v11.0</TargetFrameworkVersion>
+    <AndroidEnableSGenConcurrent>true</AndroidEnableSGenConcurrent>
+    <AndroidUseAapt2>true</AndroidUseAapt2>
+    <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AndroidLinkMode>None</AndroidLinkMode>
+    <AotAssemblies>false</AotAssemblies>
+    <EnableLLVM>false</EnableLLVM>
+    <AndroidEnableProfiledAot>false</AndroidEnableProfiledAot>
+    <BundleAssemblies>false</BundleAssemblies>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AndroidManagedSymbols>true</AndroidManagedSymbols>
+    <AndroidUseSharedRuntime>false</AndroidUseSharedRuntime>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Mono.Android" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Numerics" />
+    <Reference Include="System.Numerics.Vectors" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2012" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="MainActivity.cs" />
+    <Compile Include="Resources\Resource.designer.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\AboutResources.txt" />
+    <None Include="Assets\AboutAssets.txt" />
+    <None Include="Properties\AndroidManifest.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\values\styles.xml" />
+    <AndroidResource Include="Resources\values\colors.xml" />
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\icon.xml" />
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\icon_round.xml" />
+    <AndroidResource Include="Resources\mipmap-hdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-hdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-mdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-mdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xxhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xxhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\drawable\xamarin_logo.png" />
+    <AndroidResource Include="Resources\drawable\icon_about.png" />
+    <AndroidResource Include="Resources\drawable\icon_feed.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\HiTA\HiTA.csproj">
+      <Project>{8838EC7A-FF30-45C8-B5AD-CFEA7540D68D}</Project>
+      <Name>HiTA</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
+</Project>

HiTA.Android/MainActivity.cs

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+using System;
+
+using Android.App;
+using Android.Content.PM;
+using Android.Runtime;
+using Android.OS;
+
+namespace HiTA.Droid
+{
+    [Activity(Label = "HiTA", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize )]
+    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            base.OnCreate(savedInstanceState);
+
+            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
+            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
+            LoadApplication(new App());
+        }
+        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
+        {
+            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+
+            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+        }
+    }
+}

HiTA.Android/Properties/AndroidManifest.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.hita">
+    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="30" />
+    <application android:label="HiTA.Android" android:theme="@style/MainTheme"></application>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+</manifest>

HiTA.Android/Properties/AssemblyInfo.cs

@@ -0,0 +1,30 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using Android.App;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("HiTA.Android")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("HiTA.Android")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: ComVisible(false)]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
+
+// Add some common permissions, these can be removed if not needed
+[assembly: UsesPermission(Android.Manifest.Permission.Internet)]
+[assembly: UsesPermission(Android.Manifest.Permission.WriteExternalStorage)]

HiTA.Android/Resources/AboutResources.txt

@@ -0,0 +1,50 @@
+Images, layout descriptions, binary blobs and string dictionaries can be included 
+in your application as resource files.  Various Android APIs are designed to 
+operate on the resource IDs instead of dealing with images, strings or binary blobs 
+directly.
+
+For example, a sample Android app that contains a user interface layout (main.xml),
+an internationalization string table (strings.xml) and some icons (drawable-XXX/icon.png) 
+would keep its resources in the "Resources" directory of the application:
+
+Resources/
+    drawable-hdpi/
+        icon.png
+
+    drawable-ldpi/
+        icon.png
+
+    drawable-mdpi/
+        icon.png
+
+    layout/
+        main.xml
+
+    values/
+        strings.xml
+
+In order to get the build system to recognize Android resources, set the build action to
+"AndroidResource".  The native Android APIs do not operate directly with filenames, but 
+instead operate on resource IDs.  When you compile an Android application that uses resources, 
+the build system will package the resources for distribution and generate a class called
+"Resource" that contains the tokens for each one of the resources included. For example, 
+for the above Resources layout, this is what the Resource class would expose:
+
+public class Resource {
+    public class drawable {
+        public const int icon = 0x123;
+    }
+
+    public class layout {
+        public const int main = 0x456;
+    }
+
+    public class strings {
+        public const int first_string = 0xabc;
+        public const int second_string = 0xbcd;
+    }
+}
+
+You would then use R.drawable.icon to reference the drawable/icon.png file, or Resource.layout.main 
+to reference the layout/main.xml file, or Resource.strings.first_string to reference the first 
+string in the dictionary file values/strings.xml.

HiTA.Android/Resources/mipmap-anydpi-v26/icon.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/launcher_background" />
+    <foreground android:drawable="@mipmap/launcher_foreground" />
+</adaptive-icon>

HiTA.Android/Resources/mipmap-anydpi-v26/icon_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/launcher_background" />
+    <foreground android:drawable="@mipmap/launcher_foreground" />
+</adaptive-icon>

HiTA.Android/Resources/values/colors.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="launcher_background">#FFFFFF</color>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

HiTA.Android/Resources/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<resources>
+
+  <style name="MainTheme" parent="MainTheme.Base">
+    <!-- As of Xamarin.Forms 4.6 the theme has moved into the Forms binary -->
+    <!-- If you want to override anything you can do that here. -->
+    <!-- Underneath are a couple of entries to get you started. -->
+
+    <!-- Set theme colors from https://aka.ms/material-colors -->
+    <!-- colorPrimary is used for the default action bar background -->
+    <!--<item name="colorPrimary">#2196F3</item>-->
+    <!-- colorPrimaryDark is used for the status bar -->
+    <!--<item name="colorPrimaryDark">#1976D2</item>-->
+    <!-- colorAccent is used as the default value for colorControlActivated
+         which is used to tint widgets -->
+    <!--<item name="colorAccent">#FF4081</item>-->
+  </style>
+</resources>

HiTA.iOS/AppDelegate.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using Foundation;
+using UIKit;
+
+namespace HiTA.iOS
+{
+    // The UIApplicationDelegate for the application. This class is responsible for launching the 
+    // User Interface of the application, as well as listening (and optionally responding) to 
+    // application events from iOS.
+    [Register("AppDelegate")]
+    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
+    {
+        //
+        // This method is invoked when the application has loaded and is ready to run. In this 
+        // method you should instantiate the window, load the UI into it and then make the window
+        // visible.
+        //
+        // You have 17 seconds to return from this method, or iOS will terminate your application.
+        //
+        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
+        {
+            global::Xamarin.Forms.Forms.Init();
+            LoadApplication(new App());
+
+            return base.FinishedLaunching(app, options);
+        }
+    }
+}

HiTA.iOS/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,117 @@
+{
+  "images": [
+    {
+      "scale": "2x",
+      "size": "20x20",
+      "idiom": "iphone",
+      "filename": "Icon40.png"
+    },
+    {
+      "scale": "3x",
+      "size": "20x20",
+      "idiom": "iphone",
+      "filename": "Icon60.png"
+    },
+    {
+      "scale": "2x",
+      "size": "29x29",
+      "idiom": "iphone",
+      "filename": "Icon58.png"
+    },
+    {
+      "scale": "3x",
+      "size": "29x29",
+      "idiom": "iphone",
+      "filename": "Icon87.png"
+    },
+    {
+      "scale": "2x",
+      "size": "40x40",
+      "idiom": "iphone",
+      "filename": "Icon80.png"
+    },
+    {
+      "scale": "3x",
+      "size": "40x40",
+      "idiom": "iphone",
+      "filename": "Icon120.png"
+    },
+    {
+      "scale": "2x",
+      "size": "60x60",
+      "idiom": "iphone",
+      "filename": "Icon120.png"
+    },
+    {
+      "scale": "3x",
+      "size": "60x60",
+      "idiom": "iphone",
+      "filename": "Icon180.png"
+    },
+    {
+      "scale": "1x",
+      "size": "20x20",
+      "idiom": "ipad",
+      "filename": "Icon20.png"
+    },
+    {
+      "scale": "2x",
+      "size": "20x20",
+      "idiom": "ipad",
+      "filename": "Icon40.png"
+    },
+    {
+      "scale": "1x",
+      "size": "29x29",
+      "idiom": "ipad",
+      "filename": "Icon29.png"
+    },
+    {
+      "scale": "2x",
+      "size": "29x29",
+      "idiom": "ipad",
+      "filename": "Icon58.png"
+    },
+    {
+      "scale": "1x",
+      "size": "40x40",
+      "idiom": "ipad",
+      "filename": "Icon40.png"
+    },
+    {
+      "scale": "2x",
+      "size": "40x40",
+      "idiom": "ipad",
+      "filename": "Icon80.png"
+    },
+    {
+      "scale": "1x",
+      "size": "76x76",
+      "idiom": "ipad",
+      "filename": "Icon76.png"
+    },
+    {
+      "scale": "2x",
+      "size": "76x76",
+      "idiom": "ipad",
+      "filename": "Icon152.png"
+    },
+    {
+      "scale": "2x",
+      "size": "83.5x83.5",
+      "idiom": "ipad",
+      "filename": "Icon167.png"
+    },
+    {
+      "scale": "1x",
+      "size": "1024x1024",
+      "idiom": "ios-marketing",
+      "filename": "Icon1024.png"
+    }
+  ],
+  "properties": {},
+  "info": {
+    "version": 1,
+    "author": "xcode"
+  }
+}

HiTA.iOS/Entitlements.plist

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+</dict>
+</plist>
+

HiTA.iOS/HiTA.iOS.csproj

@@ -0,0 +1,148 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">iPhoneSimulator</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{DD420EB8-7E35-426D-8247-FDBC6025FA68}</ProjectGuid>
+    <ProjectTypeGuids>{FEACFBD2-3405-455C-9665-78FE426C6842};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{89a4fe7c-635d-49c9-8d8c-5cd363c0d68d}</TemplateGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>HiTA.iOS</RootNamespace>
+    <IPhoneResourcePrefix>Resources</IPhoneResourcePrefix>
+    <AssemblyName>HiTA.iOS</AssemblyName>
+    <MtouchEnableSGenConc>true</MtouchEnableSGenConc>
+    <MtouchHttpClientHandler>NSUrlSessionHandler</MtouchHttpClientHandler>
+    <ProvisioningType>automatic</ProvisioningType>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhoneSimulator' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Debug</OutputPath>
+    <DefineConstants>DEBUG</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchArch>x86_64</MtouchArch>
+    <MtouchLink>None</MtouchLink>
+    <MtouchDebug>true</MtouchDebug>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhoneSimulator' ">
+    <DebugType>none</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchLink>None</MtouchLink>
+    <MtouchArch>x86_64</MtouchArch>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhone' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhone\Debug</OutputPath>
+    <DefineConstants>DEBUG</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchArch>ARM64</MtouchArch>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <MtouchDebug>true</MtouchDebug>
+    <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
+    <MtouchLink>None</MtouchLink>
+    <MtouchInterpreter>-all</MtouchInterpreter>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhone' ">
+    <DebugType>none</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhone\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchArch>ARM64</MtouchArch>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(RunConfiguration)' == 'Default' ">
+    <AppExtensionDebugBundleId />
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="Main.cs" />
+    <Compile Include="AppDelegate.cs" />
+    <None Include="Entitlements.plist" />
+    <None Include="Info.plist" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Contents.json">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon1024.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon180.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon167.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon152.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon120.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon87.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon80.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon76.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon60.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon58.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon40.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon29.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon20.png">
+      <Visible>false</Visible>
+    </ImageAsset>
+    <BundleResource Include="Resources\icon_about.png" />
+    <BundleResource Include="Resources\icon_about%402x.png" />
+    <BundleResource Include="Resources\icon_about%403x.png" />
+    <BundleResource Include="Resources\icon_feed.png" />
+    <BundleResource Include="Resources\icon_feed%402x.png" />
+    <BundleResource Include="Resources\icon_feed%403x.png" />
+    <BundleResource Include="Resources\xamarin_logo.png" />
+    <BundleResource Include="Resources\xamarin_logo%402x.png" />
+    <BundleResource Include="Resources\xamarin_logo%403x.png" />
+    <InterfaceDefinition Include="Resources\LaunchScreen.storyboard" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Xml" />
+    <Reference Include="System.Core" />
+    <Reference Include="Xamarin.iOS" />
+    <Reference Include="System.Numerics" />
+    <Reference Include="System.Numerics.Vectors" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2012" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
+  <ItemGroup>
+    <ProjectReference Include="..\HiTA\HiTA.csproj">
+      <Project>{8838EC7A-FF30-45C8-B5AD-CFEA7540D68D}</Project>
+      <Name>HiTA</Name>
+    </ProjectReference>
+  </ItemGroup>
+</Project>

HiTA.iOS/Info.plist

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>UIDeviceFamily</key>
+    <array>
+        <integer>1</integer>
+        <integer>2</integer>
+    </array>
+    <key>UISupportedInterfaceOrientations</key>
+    <array>
+        <string>UIInterfaceOrientationPortrait</string>
+        <string>UIInterfaceOrientationLandscapeLeft</string>
+        <string>UIInterfaceOrientationLandscapeRight</string>
+    </array>
+    <key>UISupportedInterfaceOrientations~ipad</key>
+    <array>
+        <string>UIInterfaceOrientationPortrait</string>
+        <string>UIInterfaceOrientationPortraitUpsideDown</string>
+        <string>UIInterfaceOrientationLandscapeLeft</string>
+        <string>UIInterfaceOrientationLandscapeRight</string>
+    </array>
+    <key>MinimumOSVersion</key>
+    <string>8.0</string>
+    <key>CFBundleDisplayName</key>
+    <string>HiTA</string>
+    <key>CFBundleIdentifier</key>
+    <string>com.companyname.HiTA</string>
+    <key>CFBundleVersion</key>
+    <string>1.0</string>
+    <key>UILaunchStoryboardName</key>
+    <string>LaunchScreen</string>
+    <key>CFBundleName</key>
+    <string>HiTA</string>
+    <key>XSAppIconAssets</key>
+    <string>Assets.xcassets/AppIcon.appiconset</string>
+</dict>
+</plist>

HiTA.iOS/Main.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using Foundation;
+using UIKit;
+
+namespace HiTA.iOS
+{
+    public class Application
+    {
+        // This is the main entry point of the application.
+        static void Main(string[] args)
+        {
+            // if you want to use a different Application Delegate class from "AppDelegate"
+            // you can specify it here.
+            UIApplication.Main(args, null, "AppDelegate");
+        }
+    }
+}

HiTA.iOS/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("HiTA.iOS")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("HiTA.iOS")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("72bdc44f-c588-44f3-b6df-9aace7daafdd")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

HiTA.iOS/Resources/LaunchScreen.storyboard

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6245" systemVersion="13F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="X5k-f2-b5h">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="gAE-YM-kbH">
+            <objects>
+                <viewController id="X5k-f2-b5h" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Y8P-hJ-Z43"/>
+                        <viewControllerLayoutGuide type="bottom" id="9ZL-r4-8FZ"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="yd7-JS-zBw">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" misplaced="YES" image="Icon-60.png" translatesAutoresizingMaskIntoConstraints="NO" id="23">
+                                <rect key="frame" x="270" y="270" width="60" height="60"/>
+                                <rect key="contentStretch" x="0.0" y="0.0" width="0.0" height="0.0"/>
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="0.20392156862745098" green="0.59607843137254901" blue="0.85882352941176465" alpha="1" colorSpace="calibratedRGB"/>
+                        <constraints>
+                            <constraint firstItem="23" firstAttribute="centerY" secondItem="yd7-JS-zBw" secondAttribute="centerY" priority="1" id="39"/>
+                            <constraint firstItem="23" firstAttribute="centerX" secondItem="yd7-JS-zBw" secondAttribute="centerX" priority="1" id="41"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="XAI-xm-WK6" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="349" y="339"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="Icon-60.png" width="180" height="180"/>
+    </resources>
+</document>

HiTA.sln

@@ -0,0 +1,83 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31105.61
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HiTA.Android", "HiTA.Android\HiTA.Android.csproj", "{35B3EBB9-6BBF-4478-8245-DA7189B55386}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HiTA.iOS", "HiTA.iOS\HiTA.iOS.csproj", "{DD420EB8-7E35-426D-8247-FDBC6025FA68}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HiTA", "HiTA\HiTA.csproj", "{80E56974-9E79-4225-B45F-CE8FBE1822C1}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|iPhone = Debug|iPhone
+		Debug|iPhoneSimulator = Debug|iPhoneSimulator
+		Release|Any CPU = Release|Any CPU
+		Release|iPhone = Release|iPhone
+		Release|iPhoneSimulator = Release|iPhoneSimulator
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{35B3EBB9-6BBF-4478-8245-DA7189B55386}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{35B3EBB9-6BBF-4478-8245-DA7189B55386}.Debug|Any CPU.Build.0 = Debug|Any CPU
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+		{35B3EBB9-6BBF-4478-8245-DA7189B55386}.Release|iPhone.ActiveCfg = Release|Any CPU
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+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|Any CPU.ActiveCfg = Debug|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|Any CPU.Build.0 = Debug|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|Any CPU.Deploy.0 = Debug|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|iPhone.ActiveCfg = Debug|iPhone
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|iPhone.Build.0 = Debug|iPhone
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|iPhone.Deploy.0 = Debug|iPhone
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|iPhoneSimulator.ActiveCfg = Debug|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|iPhoneSimulator.Build.0 = Debug|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Debug|iPhoneSimulator.Deploy.0 = Debug|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Release|Any CPU.ActiveCfg = Release|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Release|Any CPU.Build.0 = Release|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Release|Any CPU.Deploy.0 = Release|iPhoneSimulator
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Release|iPhone.ActiveCfg = Release|iPhone
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Release|iPhone.Build.0 = Release|iPhone
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Release|iPhone.Deploy.0 = Release|iPhone
+		{DD420EB8-7E35-426D-8247-FDBC6025FA68}.Release|iPhoneSimulator.ActiveCfg = Release|iPhoneSimulator
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+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Debug|iPhone.ActiveCfg = Debug|Any CPU
+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Debug|iPhone.Deploy.0 = Debug|Any CPU
+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Debug|iPhoneSimulator.Deploy.0 = Debug|Any CPU
+		{80E56974-9E79-4225-B45F-CE8FBE1822C1}.Release|Any CPU.ActiveCfg = Release|Any CPU
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+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A23038C3-EFD7-4A84-87D2-1A2C4F4C96AD}
+	EndGlobalSection
+EndGlobal

HiTA/App.xaml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<Application xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="HiTA.App">
+    <!--
+        Define global resources and styles here, that apply to all pages in your app.
+    -->
+    <Application.Resources>
+        <ResourceDictionary>
+            <Color x:Key="Primary">#2196F3</Color>
+            <Style TargetType="Button">
+                <Setter Property="TextColor" Value="White"></Setter>
+                <Setter Property="VisualStateManager.VisualStateGroups">
+                    <VisualStateGroupList>
+                        <VisualStateGroup x:Name="CommonStates">
+                            <VisualState x:Name="Normal">
+                                <VisualState.Setters>
+                                    <Setter Property="BackgroundColor" Value="{StaticResource Primary}" />
+                                </VisualState.Setters>
+                            </VisualState>
+                            <VisualState x:Name="Disabled">
+                                <VisualState.Setters>
+                                    <Setter Property="BackgroundColor" Value="#332196F3" />
+                                </VisualState.Setters>
+                            </VisualState>
+                        </VisualStateGroup>
+                    </VisualStateGroupList>
+                </Setter>
+            </Style>
+        </ResourceDictionary>        
+    </Application.Resources>
+</Application>

HiTA/App.xaml.cs

@@ -0,0 +1,32 @@
+using HiTA.Services;
+using HiTA.Views;
+using System;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace HiTA
+{
+    public partial class App : Application
+    {
+
+        public App()
+        {
+            InitializeComponent();
+
+            DependencyService.Register<MockDataStore>();
+            MainPage = new AppShell();
+        }
+
+        protected override void OnStart()
+        {
+        }
+
+        protected override void OnSleep()
+        {
+        }
+
+        protected override void OnResume()
+        {
+        }
+    }
+}

HiTA/AppShell.xaml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Shell xmlns="http://xamarin.com/schemas/2014/forms" 
+       xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+       xmlns:local="clr-namespace:HiTA.Views"
+       Title="HiTA"
+       x:Class="HiTA.AppShell">
+
+    <!--
+        The overall app visual hierarchy is defined here, along with navigation.
+    
+        https://docs.microsoft.com/xamarin/xamarin-forms/app-fundamentals/shell/
+    -->
+
+    <Shell.Resources>
+        <ResourceDictionary>
+            <Style x:Key="BaseStyle" TargetType="Element">
+                <Setter Property="Shell.BackgroundColor" Value="{StaticResource Primary}" />
+                <Setter Property="Shell.ForegroundColor" Value="White" />
+                <Setter Property="Shell.TitleColor" Value="White" />
+                <Setter Property="Shell.DisabledColor" Value="#B4FFFFFF" />
+                <Setter Property="Shell.UnselectedColor" Value="#95FFFFFF" />
+                <Setter Property="Shell.TabBarBackgroundColor" Value="{StaticResource Primary}" />
+                <Setter Property="Shell.TabBarForegroundColor" Value="White"/>
+                <Setter Property="Shell.TabBarUnselectedColor" Value="#95FFFFFF"/>
+                <Setter Property="Shell.TabBarTitleColor" Value="White"/>
+            </Style>
+            <Style TargetType="TabBar" BasedOn="{StaticResource BaseStyle}" />
+            <Style TargetType="FlyoutItem" BasedOn="{StaticResource BaseStyle}" />
+        </ResourceDictionary>
+    </Shell.Resources>
+
+    <TabBar>
+        <ShellContent Title="About" Icon="icon_about.png" Route="AboutPage" ContentTemplate="{DataTemplate local:AboutPage}" />
+        <ShellContent Title="Browse" Icon="icon_feed.png" ContentTemplate="{DataTemplate local:ItemsPage}" />
+    </TabBar>
+
+    <!--
+        If you would like to navigate to this content you can do so by calling
+        await Shell.Current.GoToAsync("//LoginPage");
+    -->
+    <TabBar>
+        <ShellContent Route="LoginPage" ContentTemplate="{DataTemplate local:LoginPage}" />
+    </TabBar>
+
+
+</Shell>

HiTA/AppShell.xaml.cs

@@ -0,0 +1,19 @@
+using HiTA.ViewModels;
+using HiTA.Views;
+using System;
+using System.Collections.Generic;
+using Xamarin.Forms;
+
+namespace HiTA
+{
+    public partial class AppShell : Xamarin.Forms.Shell
+    {
+        public AppShell()
+        {
+            InitializeComponent();
+            Routing.RegisterRoute(nameof(ItemDetailPage), typeof(ItemDetailPage));
+            Routing.RegisterRoute(nameof(NewItemPage), typeof(NewItemPage));
+        }
+
+    }
+}

HiTA/AssemblyInfo.cs

@@ -0,0 +1,3 @@
+using Xamarin.Forms.Xaml;
+
+[assembly: XamlCompilation(XamlCompilationOptions.Compile)]

HiTA/GettingStarted.txt

@@ -0,0 +1,34 @@
+Welcome to Xamarin.Forms! Here are some tips to get started building your app.
+
+Building Your App UI
+--------------------
+
+XAML Hot Reload quickly applies UI changes as you make them to your running app.
+This is the most productive way to preview and iteratively create your UI.
+
+Try it out:
+
+1. Run the app by clicking the Start Debugging (play) button in the above toolbar. 
+2. Open <MainProject>\Views\AboutPage.xaml.
+   Don't stop the app - keep it running while making changes.
+3. Change something! Hint: change the Accent color on line 14 from "#96d1ff" to "Pink".
+4. Watch the About screen update on the device or emulator, with the logo background now pink.
+
+Keep going and try more changes!
+
+QuickStart Guide
+----------------
+
+Learn more of the fundamentals for building apps with Xamarin here: https://aka.ms/xamarin-quickstart
+
+Your App Shell
+--------------
+
+This template uses Shell, an app container that reduces the complexity of your apps by providing fundamental features including:
+
+- A single place to describe the app's visual hierarchy.
+- Common navigation such as a flyout menu and tabs.
+- A URI-based navigation scheme that permits navigation to any page in the application.
+- An integrated search handler.
+
+Open AppShell.xaml to begin exploring. To learn more about Shell visit: https://docs.microsoft.com/xamarin/xamarin-forms/app-fundamentals/shell/introduction

HiTA/HiTA.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <ProduceReferenceAssembly>true</ProduceReferenceAssembly>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2012" />  
+    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+  </ItemGroup>
+</Project>

HiTA/Models/Item.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace HiTA.Models
+{
+    public class Item
+    {
+        public string Id { get; set; }
+        public string Text { get; set; }
+        public string Description { get; set; }
+    }
+}

HiTA/Services/IDataStore.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace HiTA.Services
+{
+    public interface IDataStore<T>
+    {
+        Task<bool> AddItemAsync(T item);
+        Task<bool> UpdateItemAsync(T item);
+        Task<bool> DeleteItemAsync(string id);
+        Task<T> GetItemAsync(string id);
+        Task<IEnumerable<T>> GetItemsAsync(bool forceRefresh = false);
+    }
+}

HiTA/Services/MockDataStore.cs

@@ -0,0 +1,60 @@
+using HiTA.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace HiTA.Services
+{
+    public class MockDataStore : IDataStore<Item>
+    {
+        readonly List<Item> items;
+
+        public MockDataStore()
+        {
+            items = new List<Item>()
+            {
+                new Item { Id = Guid.NewGuid().ToString(), Text = "First item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Second item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Third item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Fourth item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Fifth item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Sixth item", Description="This is an item description." }
+            };
+        }
+
+        public async Task<bool> AddItemAsync(Item item)
+        {
+            items.Add(item);
+
+            return await Task.FromResult(true);
+        }
+
+        public async Task<bool> UpdateItemAsync(Item item)
+        {
+            var oldItem = items.Where((Item arg) => arg.Id == item.Id).FirstOrDefault();
+            items.Remove(oldItem);
+            items.Add(item);
+
+            return await Task.FromResult(true);
+        }
+
+        public async Task<bool> DeleteItemAsync(string id)
+        {
+            var oldItem = items.Where((Item arg) => arg.Id == id).FirstOrDefault();
+            items.Remove(oldItem);
+
+            return await Task.FromResult(true);
+        }
+
+        public async Task<Item> GetItemAsync(string id)
+        {
+            return await Task.FromResult(items.FirstOrDefault(s => s.Id == id));
+        }
+
+        public async Task<IEnumerable<Item>> GetItemsAsync(bool forceRefresh = false)
+        {
+            return await Task.FromResult(items);
+        }
+    }
+}

HiTA/ViewModels/AboutViewModel.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Windows.Input;
+using Xamarin.Essentials;
+using Xamarin.Forms;
+
+namespace HiTA.ViewModels
+{
+    public class AboutViewModel : BaseViewModel
+    {
+        public AboutViewModel()
+        {
+            Title = "About";
+            OpenWebCommand = new Command(async () => await Browser.OpenAsync("https://aka.ms/xamarin-quickstart"));
+        }
+
+        public ICommand OpenWebCommand { get; }
+    }
+}

HiTA/ViewModels/BaseViewModel.cs

@@ -0,0 +1,54 @@
+using HiTA.Models;
+using HiTA.Services;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using Xamarin.Forms;
+
+namespace HiTA.ViewModels
+{
+    public class BaseViewModel : INotifyPropertyChanged
+    {
+        public IDataStore<Item> DataStore => DependencyService.Get<IDataStore<Item>>();
+
+        bool isBusy = false;
+        public bool IsBusy
+        {
+            get { return isBusy; }
+            set { SetProperty(ref isBusy, value); }
+        }
+
+        string title = string.Empty;
+        public string Title
+        {
+            get { return title; }
+            set { SetProperty(ref title, value); }
+        }
+
+        protected bool SetProperty<T>(ref T backingStore, T value,
+            [CallerMemberName] string propertyName = "",
+            Action onChanged = null)
+        {
+            if (EqualityComparer<T>.Default.Equals(backingStore, value))
+                return false;
+
+            backingStore = value;
+            onChanged?.Invoke();
+            OnPropertyChanged(propertyName);
+            return true;
+        }
+
+        #region INotifyPropertyChanged
+        public event PropertyChangedEventHandler PropertyChanged;
+        protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
+        {
+            var changed = PropertyChanged;
+            if (changed == null)
+                return;
+
+            changed.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+        #endregion
+    }
+}

HiTA/ViewModels/ItemDetailViewModel.cs

@@ -0,0 +1,57 @@
+using HiTA.Models;
+using System;
+using System.Diagnostics;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace HiTA.ViewModels
+{
+    [QueryProperty(nameof(ItemId), nameof(ItemId))]
+    public class ItemDetailViewModel : BaseViewModel
+    {
+        private string itemId;
+        private string text;
+        private string description;
+        public string Id { get; set; }
+
+        public string Text
+        {
+            get => text;
+            set => SetProperty(ref text, value);
+        }
+
+        public string Description
+        {
+            get => description;
+            set => SetProperty(ref description, value);
+        }
+
+        public string ItemId
+        {
+            get
+            {
+                return itemId;
+            }
+            set
+            {
+                itemId = value;
+                LoadItemId(value);
+            }
+        }
+
+        public async void LoadItemId(string itemId)
+        {
+            try
+            {
+                var item = await DataStore.GetItemAsync(itemId);
+                Id = item.Id;
+                Text = item.Text;
+                Description = item.Description;
+            }
+            catch (Exception)
+            {
+                Debug.WriteLine("Failed to Load Item");
+            }
+        }
+    }
+}

HiTA/ViewModels/ItemsViewModel.cs

@@ -0,0 +1,84 @@
+using HiTA.Models;
+using HiTA.Views;
+using System;
+using System.Collections.ObjectModel;
+using System.Diagnostics;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace HiTA.ViewModels
+{
+    public class ItemsViewModel : BaseViewModel
+    {
+        private Item _selectedItem;
+
+        public ObservableCollection<Item> Items { get; }
+        public Command LoadItemsCommand { get; }
+        public Command AddItemCommand { get; }
+        public Command<Item> ItemTapped { get; }
+
+        public ItemsViewModel()
+        {
+            Title = "Browse";
+            Items = new ObservableCollection<Item>();
+            LoadItemsCommand = new Command(async () => await ExecuteLoadItemsCommand());
+
+            ItemTapped = new Command<Item>(OnItemSelected);
+
+            AddItemCommand = new Command(OnAddItem);
+        }
+
+        async Task ExecuteLoadItemsCommand()
+        {
+            IsBusy = true;
+
+            try
+            {
+                Items.Clear();
+                var items = await DataStore.GetItemsAsync(true);
+                foreach (var item in items)
+                {
+                    Items.Add(item);
+                }
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine(ex);
+            }
+            finally
+            {
+                IsBusy = false;
+            }
+        }
+
+        public void OnAppearing()
+        {
+            IsBusy = true;
+            SelectedItem = null;
+        }
+
+        public Item SelectedItem
+        {
+            get => _selectedItem;
+            set
+            {
+                SetProperty(ref _selectedItem, value);
+                OnItemSelected(value);
+            }
+        }
+
+        private async void OnAddItem(object obj)
+        {
+            await Shell.Current.GoToAsync(nameof(NewItemPage));
+        }
+
+        async void OnItemSelected(Item item)
+        {
+            if (item == null)
+                return;
+
+            // This will push the ItemDetailPage onto the navigation stack
+            await Shell.Current.GoToAsync($"{nameof(ItemDetailPage)}?{nameof(ItemDetailViewModel.ItemId)}={item.Id}");
+        }
+    }
+}

HiTA/ViewModels/LoginViewModel.cs

@@ -0,0 +1,24 @@
+using HiTA.Views;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xamarin.Forms;
+
+namespace HiTA.ViewModels
+{
+    public class LoginViewModel : BaseViewModel
+    {
+        public Command LoginCommand { get; }
+
+        public LoginViewModel()
+        {
+            LoginCommand = new Command(OnLoginClicked);
+        }
+
+        private async void OnLoginClicked(object obj)
+        {
+            // Prefixing with `//` switches to a different navigation stack instead of pushing to the active one
+            await Shell.Current.GoToAsync($"//{nameof(AboutPage)}");
+        }
+    }
+}

HiTA/ViewModels/NewItemViewModel.cs

@@ -0,0 +1,65 @@
+using HiTA.Models;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows.Input;
+using Xamarin.Forms;
+
+namespace HiTA.ViewModels
+{
+    public class NewItemViewModel : BaseViewModel
+    {
+        private string text;
+        private string description;
+
+        public NewItemViewModel()
+        {
+            SaveCommand = new Command(OnSave, ValidateSave);
+            CancelCommand = new Command(OnCancel);
+            this.PropertyChanged +=
+                (_, __) => SaveCommand.ChangeCanExecute();
+        }
+
+        private bool ValidateSave()
+        {
+            return !String.IsNullOrWhiteSpace(text)
+                && !String.IsNullOrWhiteSpace(description);
+        }
+
+        public string Text
+        {
+            get => text;
+            set => SetProperty(ref text, value);
+        }
+
+        public string Description
+        {
+            get => description;
+            set => SetProperty(ref description, value);
+        }
+
+        public Command SaveCommand { get; }
+        public Command CancelCommand { get; }
+
+        private async void OnCancel()
+        {
+            // This will pop the current page off the navigation stack
+            await Shell.Current.GoToAsync("..");
+        }
+
+        private async void OnSave()
+        {
+            Item newItem = new Item()
+            {
+                Id = Guid.NewGuid().ToString(),
+                Text = Text,
+                Description = Description
+            };
+
+            await DataStore.AddItemAsync(newItem);
+
+            // This will pop the current page off the navigation stack
+            await Shell.Current.GoToAsync("..");
+        }
+    }
+}

HiTA/Views/AboutPage.xaml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="HiTA.Views.AboutPage"
+             xmlns:vm="clr-namespace:HiTA.ViewModels"
+             Title="{Binding Title}">
+    
+    <ContentPage.BindingContext>
+        <vm:AboutViewModel />
+    </ContentPage.BindingContext>
+    
+    <ContentPage.Resources>
+        <ResourceDictionary>
+            <Color x:Key="Accent">#96d1ff</Color>
+        </ResourceDictionary>
+    </ContentPage.Resources>
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+        <StackLayout BackgroundColor="{StaticResource Accent}" VerticalOptions="FillAndExpand" HorizontalOptions="Fill">
+            <StackLayout Orientation="Horizontal" HorizontalOptions="Center" VerticalOptions="Center">
+                <ContentView Padding="0,40,0,40" VerticalOptions="FillAndExpand">
+                    <Image Source="xamarin_logo.png" VerticalOptions="Center" HeightRequest="64" />
+                </ContentView>
+            </StackLayout>
+        </StackLayout>
+        <ScrollView Grid.Row="1">
+            <StackLayout Orientation="Vertical" Padding="30,24,30,24" Spacing="10">
+                <Label Text="Start developing now" FontSize="Title"/>
+                <Label Text="Make changes to your XAML file and save to see your UI update in the running app with XAML Hot Reload. Give it a try!" FontSize="16" Padding="0,0,0,0"/>
+                <Label FontSize="16" Padding="0,10,0,0">
+                    <Label.FormattedText>
+                        <FormattedString>
+                            <FormattedString.Spans>
+                                <Span Text="Learn more at "/>
+                                <Span Text="https://aka.ms/xamarin-quickstart" FontAttributes="Bold"/>
+                            </FormattedString.Spans>
+                        </FormattedString>
+                    </Label.FormattedText>
+                </Label>
+                <Button Margin="0,10,0,0" Text="Learn more"
+                        Command="{Binding OpenWebCommand}"
+                        BackgroundColor="{StaticResource Primary}"
+                        TextColor="White" />
+            </StackLayout>
+        </ScrollView>
+    </Grid>
+
+</ContentPage>

HiTA/Views/AboutPage.xaml.cs

@@ -0,0 +1,15 @@
+using System;
+using System.ComponentModel;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace HiTA.Views
+{
+    public partial class AboutPage : ContentPage
+    {
+        public AboutPage()
+        {
+            InitializeComponent();
+        }
+    }
+}

HiTA/Views/ItemDetailPage.xaml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="HiTA.Views.ItemDetailPage"
+             Title="{Binding Title}">
+
+    <StackLayout Spacing="20" Padding="15">
+        <Label Text="Text:" FontSize="Medium" />
+        <Label Text="{Binding Text}" FontSize="Small"/>
+        <Label Text="Description:" FontSize="Medium" />
+        <Label Text="{Binding Description}" FontSize="Small"/>
+    </StackLayout>
+    
+</ContentPage>

HiTA/Views/ItemDetailPage.xaml.cs

@@ -0,0 +1,15 @@
+using HiTA.ViewModels;
+using System.ComponentModel;
+using Xamarin.Forms;
+
+namespace HiTA.Views
+{
+    public partial class ItemDetailPage : ContentPage
+    {
+        public ItemDetailPage()
+        {
+            InitializeComponent();
+            BindingContext = new ItemDetailViewModel();
+        }
+    }
+}

HiTA/Views/ItemsPage.xaml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="HiTA.Views.ItemsPage"
+             Title="{Binding Title}"
+             xmlns:local="clr-namespace:HiTA.ViewModels"  
+             xmlns:model="clr-namespace:HiTA.Models"  
+             x:Name="BrowseItemsPage">
+
+    <ContentPage.ToolbarItems>
+        <ToolbarItem Text="Add" Command="{Binding AddItemCommand}" />
+    </ContentPage.ToolbarItems>
+    <!--
+      x:DataType enables compiled bindings for better performance and compile time validation of binding expressions.
+      https://docs.microsoft.com/xamarin/xamarin-forms/app-fundamentals/data-binding/compiled-bindings
+    -->
+    <RefreshView x:DataType="local:ItemsViewModel" Command="{Binding LoadItemsCommand}" IsRefreshing="{Binding IsBusy, Mode=TwoWay}">
+        <CollectionView x:Name="ItemsListView"
+                ItemsSource="{Binding Items}"
+                SelectionMode="None">
+            <CollectionView.ItemTemplate>
+                <DataTemplate>
+                    <StackLayout Padding="10" x:DataType="model:Item">
+                        <Label Text="{Binding Text}" 
+                            LineBreakMode="NoWrap" 
+                            Style="{DynamicResource ListItemTextStyle}" 
+                            FontSize="16" />
+                        <Label Text="{Binding Description}" 
+                            LineBreakMode="NoWrap"
+                            Style="{DynamicResource ListItemDetailTextStyle}"
+                            FontSize="13" />
+                        <StackLayout.GestureRecognizers>
+                            <TapGestureRecognizer 
+                                NumberOfTapsRequired="1"
+                                Command="{Binding Source={RelativeSource AncestorType={x:Type local:ItemsViewModel}}, Path=ItemTapped}"		
+                                CommandParameter="{Binding .}">
+                            </TapGestureRecognizer>
+                        </StackLayout.GestureRecognizers>
+                    </StackLayout>
+                </DataTemplate>
+            </CollectionView.ItemTemplate>
+        </CollectionView>
+    </RefreshView>
+</ContentPage>

HiTA/Views/ItemsPage.xaml.cs

@@ -0,0 +1,32 @@
+using HiTA.Models;
+using HiTA.ViewModels;
+using HiTA.Views;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace HiTA.Views
+{
+    public partial class ItemsPage : ContentPage
+    {
+        ItemsViewModel _viewModel;
+
+        public ItemsPage()
+        {
+            InitializeComponent();
+
+            BindingContext = _viewModel = new ItemsViewModel();
+        }
+
+        protected override void OnAppearing()
+        {
+            base.OnAppearing();
+            _viewModel.OnAppearing();
+        }
+    }
+}

HiTA/Views/LoginPage.xaml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             x:Class="HiTA.Views.LoginPage"
+             Shell.NavBarIsVisible="False">
+    <ContentPage.Content>
+        <StackLayout Padding="10,0,10,0" VerticalOptions="Center">
+            <Button VerticalOptions="Center" Text="Login" Command="{Binding LoginCommand}"/>
+        </StackLayout>
+    </ContentPage.Content>
+</ContentPage>

HiTA/Views/LoginPage.xaml.cs

@@ -0,0 +1,21 @@
+using HiTA.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace HiTA.Views
+{
+    [XamlCompilation(XamlCompilationOptions.Compile)]
+    public partial class LoginPage : ContentPage
+    {
+        public LoginPage()
+        {
+            InitializeComponent();
+            this.BindingContext = new LoginViewModel();
+        }
+    }
+}

HiTA/Views/NewItemPage.xaml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="HiTA.Views.NewItemPage"
+             Shell.PresentationMode="ModalAnimated"
+             Title="New Item"
+             xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
+             ios:Page.UseSafeArea="true">
+    <ContentPage.Content>
+        <StackLayout Spacing="3" Padding="15">
+            <Label Text="Text" FontSize="Medium" />
+            <Entry Text="{Binding Text, Mode=TwoWay}" FontSize="Medium" />
+            <Label Text="Description" FontSize="Medium" />
+            <Editor Text="{Binding Description, Mode=TwoWay}" AutoSize="TextChanges" FontSize="Medium" Margin="0" />
+            <StackLayout Orientation="Horizontal">
+                <Button Text="Cancel" Command="{Binding CancelCommand}" HorizontalOptions="FillAndExpand"></Button>
+                <Button Text="Save" Command="{Binding SaveCommand}" HorizontalOptions="FillAndExpand"></Button>
+            </StackLayout>
+        </StackLayout>
+    </ContentPage.Content>
+    
+</ContentPage>

HiTA/Views/NewItemPage.xaml.cs

@@ -0,0 +1,21 @@
+using HiTA.Models;
+using HiTA.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace HiTA.Views
+{
+    public partial class NewItemPage : ContentPage
+    {
+        public Item Item { get; set; }
+
+        public NewItemPage()
+        {
+            InitializeComponent();
+            BindingContext = new NewItemViewModel();
+        }
+    }
+}