StartupPerformance sample

src/Startup/StartupPerformance.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.28902.138
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StartupPerformance.Android", "StartupPerformance\StartupPerformance.Android\StartupPerformance.Android.csproj", "{B40F3902-B17F-4C05-BD4F-D79AB4465129}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StartupPerformance", "StartupPerformance\StartupPerformance\StartupPerformance.csproj", "{9C05E336-7C4B-4A58-A2AC-4311EEBD91D0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B40F3902-B17F-4C05-BD4F-D79AB4465129}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B40F3902-B17F-4C05-BD4F-D79AB4465129}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B40F3902-B17F-4C05-BD4F-D79AB4465129}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{B40F3902-B17F-4C05-BD4F-D79AB4465129}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B40F3902-B17F-4C05-BD4F-D79AB4465129}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B40F3902-B17F-4C05-BD4F-D79AB4465129}.Release|Any CPU.Deploy.0 = Release|Any CPU
+		{9C05E336-7C4B-4A58-A2AC-4311EEBD91D0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9C05E336-7C4B-4A58-A2AC-4311EEBD91D0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9C05E336-7C4B-4A58-A2AC-4311EEBD91D0}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{9C05E336-7C4B-4A58-A2AC-4311EEBD91D0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9C05E336-7C4B-4A58-A2AC-4311EEBD91D0}.Release|Any CPU.Build.0 = Release|Any CPU
+		{9C05E336-7C4B-4A58-A2AC-4311EEBD91D0}.Release|Any CPU.Deploy.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {EB83BD66-5080-482B-ABB0-CC032079A7EA}
+	EndGlobalSection
+EndGlobal

src/Startup/StartupPerformance/StartupPerformance.Android/Assets/AboutAssets.txt

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+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 you 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");

src/Startup/StartupPerformance/StartupPerformance.Android/Helpers/ProfilerTimeHelper.cs

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+using Java.IO;
+using Java.Lang;
+using System;
+using System.Globalization;
+
+namespace StartupPerformance.Droid.Helpers
+{
+    // Based on: https://github.com/toomasz/XamarinAppStartupTime
+    // By Tomasz Ścisłowicz
+    public class ProfilerTimeHelper
+    {
+        const string LogcatTimeFormat = "yyyy-MM-dd HH:mm:ss.fff";
+
+        private static DateTime? StartupTime;
+        private static bool _attemptedToGetStartupTime;
+
+        public static DateTime? GetAppStartupTime()
+        {
+            if (_attemptedToGetStartupTime)
+            {
+                return StartupTime;
+            }
+            if (!StartupTime.HasValue)
+            {
+                StartupTime = GetStartupTimeFromLogcat();
+                _attemptedToGetStartupTime = true;
+            }
+            return StartupTime;
+        }
+
+        private static DateTime? GetStartupTimeFromLogcat()
+        {
+            var pid = Android.OS.Process.MyPid();
+
+            var process = new ProcessBuilder().
+                RedirectErrorStream(true).
+                Command("/system/bin/logcat", $"--pid={pid}", "-m", "1", "-v", "year").Start();
+
+            using (var bufferedReader = new BufferedReader(new InputStreamReader(process.InputStream)))
+            {
+                string line = null;
+                while ((line = bufferedReader.ReadLine()) != null)
+                {
+                    if (ParseLogDateTime(line, out DateTime date))
+                    {
+                        return date;
+                    }
+                }
+            }
+
+            return null;
+        }
+
+        private static bool ParseLogDateTime(string logLine, out DateTime dateTime)
+        {
+            if (logLine.Length < LogcatTimeFormat.Length)
+            {
+                dateTime = new DateTime();
+                return false;
+            }
+            var timeStr = logLine.Substring(0, LogcatTimeFormat.Length);
+
+            return DateTime.TryParseExact(timeStr, LogcatTimeFormat,
+                CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out dateTime);
+        }
+    }
+}

src/Startup/StartupPerformance/StartupPerformance.Android/MainActivity.cs

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+using System;
+using Android.App;
+using Android.Content.PM;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using Android.OS;
+using StartupPerformance.Droid.Services;
+using Xamarin.Forms;
+
+namespace StartupPerformance.Droid
+{
+    [Activity(
+        Label = "StartupPerformance", 
+        Icon = "@mipmap/icon", 
+        Theme = "@style/MainTheme", 
+        MainLauncher = true, 
+        ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
+    public class MainActivity : Xamarin.Forms.Platform.Android.FormsAppCompatActivity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            TabLayoutResource = Resource.Layout.Tabbar;
+            ToolbarResource = Resource.Layout.Toolbar;
+
+            base.OnCreate(savedInstanceState);
+
+            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
+            Forms.Init(this, savedInstanceState);
+            DependencyService.Register<ProfilerService>();
+            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);
+        }
+    }
+}

src/Startup/StartupPerformance/StartupPerformance.Android/Properties/AndroidManifest.xml

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+<?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">
+    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
+    <application android:label="StartupPerformance.Android"></application>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+</manifest>

src/Startup/StartupPerformance/StartupPerformance.Android/Properties/AssemblyInfo.cs

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+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("StartupPerformance.Android")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("StartupPerformance.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
+//
+// 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")]
+
+// Add some common permissions, these can be removed if not needed
+[assembly: UsesPermission(Android.Manifest.Permission.Internet)]
+[assembly: UsesPermission(Android.Manifest.Permission.WriteExternalStorage)]

src/Startup/StartupPerformance/StartupPerformance.Android/Resources/AboutResources.txt

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+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.

src/Startup/StartupPerformance/StartupPerformance.Android/Resources/layout/Tabbar.axml

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+<?xml version="1.0" encoding="utf-8"?>
+<android.support.design.widget.TabLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/sliding_tabs"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/colorPrimary"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    app:tabIndicatorColor="@android:color/white"
+    app:tabGravity="fill"
+    app:tabMode="fixed" />

src/Startup/StartupPerformance/StartupPerformance.Android/Resources/layout/Toolbar.axml

@@ -0,0 +1,9 @@
+<android.support.v7.widget.Toolbar
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/toolbar"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/colorPrimary"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    android:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
+

src/Startup/StartupPerformance/StartupPerformance.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>

src/Startup/StartupPerformance/StartupPerformance.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>

src/Startup/StartupPerformance/StartupPerformance.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>

src/Startup/StartupPerformance/StartupPerformance.Android/Resources/values/styles.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<resources>
+
+  <style name="MainTheme" parent="MainTheme.Base">
+  </style>
+  <!-- Base theme applied no matter what API -->
+  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
+    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
+    <item name="windowNoTitle">true</item>
+    <!--We will be using the toolbar so no need to show ActionBar-->
+    <item name="windowActionBar">false</item>
+    <!-- Set theme colors from http://www.google.com/design/spec/style/color.html#color-color-palette -->
+    <!-- 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>
+    <!-- You can also set colorControlNormal, colorControlActivated
+         colorControlHighlight and colorSwitchThumbNormal. -->
+    <item name="windowActionModeOverlay">true</item>
+
+    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
+  </style>
+
+  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
+    <item name="colorAccent">#FF4081</item>
+  </style>
+</resources>

src/Startup/StartupPerformance/StartupPerformance.Android/Services/ProfilerService.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using StartupPerformance.Droid.Helpers;
+using StartupPerformance.Services;
+
+namespace StartupPerformance.Droid.Services
+{
+    public class ProfilerService : IProfilerService
+    {
+        private static Dictionary<string, DateTime?> _eventTimingsSinceStartup = new Dictionary<string, DateTime?>();
+
+        public static void RegisterInternalEvent(string eventName)
+        {
+            if (_eventTimingsSinceStartup.ContainsKey(eventName))
+            {
+                return;
+            }
+
+            _eventTimingsSinceStartup.Add(eventName, DateTime.Now);
+        }
+
+        public void RegisterEvent(string eventName)
+        {
+            RegisterInternalEvent(eventName);
+        }
+
+        public async Task<Dictionary<string, TimeSpan?>> GetTimingsSinceStartup()
+        {
+            return await Task.Factory.StartNew(() =>
+            {
+                var timings = new Dictionary<string, TimeSpan?>();
+                var startupTime = ProfilerTimeHelper.GetAppStartupTime();
+
+                foreach (var eventInfo in _eventTimingsSinceStartup)
+                {
+                    timings.Add(eventInfo.Key, eventInfo.Value - startupTime);
+                }
+                return timings;
+            });
+        }
+
+        public DateTime? GetStartupTime()
+        {
+            return ProfilerTimeHelper.GetAppStartupTime();
+        }
+    }
+}

src/Startup/StartupPerformance/StartupPerformance.Android/StartupPerformance.Android.csproj

@@ -0,0 +1,111 @@
+<?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>{B40F3902-B17F-4C05-BD4F-D79AB4465129}</ProjectGuid>
+    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{9AA2D3C6-3393-45F1-8E7C-5A9901728795}</TemplateGuid>
+    <OutputType>Library</OutputType>
+    <RootNamespace>StartupPerformance.Droid</RootNamespace>
+    <AssemblyName>StartupPerformance.Android</AssemblyName>
+    <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>v9.0</TargetFrameworkVersion>
+    <AndroidEnableSGenConcurrent>true</AndroidEnableSGenConcurrent>
+    <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>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AndroidManagedSymbols>true</AndroidManagedSymbols>
+    <AndroidUseSharedRuntime>false</AndroidUseSharedRuntime>
+    <AotAssemblies>true</AotAssemblies>
+    <EnableLLVM>true</EnableLLVM>
+  </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="4.0.0.425677" />
+    <PackageReference Include="Xamarin.Android.Support.Design" Version="28.0.0.1" />
+    <PackageReference Include="Xamarin.Android.Support.v7.AppCompat" Version="28.0.0.1" />
+    <PackageReference Include="Xamarin.Android.Support.v4" Version="28.0.0.1" />
+    <PackageReference Include="Xamarin.Android.Support.v7.CardView" Version="28.0.0.1" />
+    <PackageReference Include="Xamarin.Android.Support.v7.MediaRouter" Version="28.0.0.1" />
+    <PackageReference Include="Xamarin.Android.Support.Core.Utils" Version="28.0.0.1" />
+    <PackageReference Include="Xamarin.Android.Support.CustomTabs" Version="28.0.0.1" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.1.0" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Helpers\ProfilerTimeHelper.cs" />
+    <Compile Include="MainActivity.cs" />
+    <Compile Include="Resources\Resource.designer.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Services\ProfilerService.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\AboutResources.txt" />
+    <None Include="Assets\AboutAssets.txt" />
+    <None Include="Properties\AndroidManifest.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\layout\Tabbar.axml" />
+    <AndroidResource Include="Resources\layout\Toolbar.axml" />
+    <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" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Resources\drawable-hdpi\" />
+    <Folder Include="Resources\drawable-xhdpi\" />
+    <Folder Include="Resources\drawable-xxhdpi\" />
+    <Folder Include="Resources\drawable-xxxhdpi\" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\StartupPerformance\StartupPerformance.csproj">
+      <Project>{9CB9F235-9A76-4D15-B982-1F2D128B0529}</Project>
+      <Name>StartupPerformance</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
+</Project>

src/Startup/StartupPerformance/StartupPerformance/App.xaml

@@ -0,0 +1,17 @@
+<?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="StartupPerformance.App">
+
+    <Application.Resources>
+        <ResourceDictionary>
+            <!--Global Styles-->
+            <Color x:Key="NavigationPrimary">#2196F3</Color>
+            <Style TargetType="NavigationPage">
+                <Setter Property="BarBackgroundColor" Value="{StaticResource NavigationPrimary}" />
+                <Setter Property="BarTextColor" Value="White" />
+            </Style>
+        </ResourceDictionary>
+    </Application.Resources>
+    
+</Application>

src/Startup/StartupPerformance/StartupPerformance/App.xaml.cs

@@ -0,0 +1,33 @@
+using StartupPerformance.Services;
+using StartupPerformance.Views;
+using Xamarin.Forms;
+
+namespace StartupPerformance
+{
+    public partial class App : Application
+    {
+        public static IProfilerService ProfilerService { get; set; } = DependencyService.Get<IProfilerService>();
+
+        public App()
+        {
+            InitializeComponent();
+
+            MainPage = new MainView();
+        }
+
+        protected override void OnStart()
+        {
+            ProfilerService.RegisterEvent("Xamarin.Forms App OnStart");
+        }
+
+        protected override void OnSleep()
+        {
+            // Handle when your app sleeps
+        }
+
+        protected override void OnResume()
+        {
+            // Handle when your app resumes
+        }
+    }
+}

src/Startup/StartupPerformance/StartupPerformance/AssemblyInfo.cs

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

src/Startup/StartupPerformance/StartupPerformance/Extensions/TimeSpanExtensions.cs

@@ -0,0 +1,48 @@
+using System;
+
+namespace StartupPerformance.Extensions
+{
+    public static class TimeSpanExtensions
+    {
+        public static string ToCanonicString(this TimeSpan? timeSpan)
+        {
+            if (!timeSpan.HasValue)
+            {
+                return "-";
+            }
+            return timeSpan.Value.ToCanonicString();
+        }
+
+        public static string ToCanonicString(this TimeSpan timeSpan, int secondsToSkipMsPart = 40)
+        {
+            int totalDays = (int)timeSpan.TotalDays;
+
+            if (totalDays > 0)
+            {
+                return $"{totalDays}d{timeSpan.Hours}h{timeSpan.Minutes}m{timeSpan.Seconds}s";
+            }
+
+            if (timeSpan.Hours > 0)
+            {
+                return $"{timeSpan.Hours}h{timeSpan.Minutes}m{timeSpan.Seconds}s";
+            }
+
+            if (timeSpan.Minutes > 0)
+            {
+                return $"{timeSpan.Minutes}m{timeSpan.Seconds}s";
+            }
+
+            if (timeSpan.Seconds < 1)
+            {
+                return $"{timeSpan.Milliseconds}ms";
+            }
+
+            if (timeSpan.Seconds < secondsToSkipMsPart)
+            {
+                return $"{timeSpan.Seconds}s{timeSpan.Milliseconds}ms";
+            }
+
+            return $"{timeSpan.Seconds}s";
+        }
+    }
+}

src/Startup/StartupPerformance/StartupPerformance/Models/Timing.cs

@@ -0,0 +1,17 @@
+using StartupPerformance.Extensions;
+using System;
+
+namespace StartupPerformance.Models
+{
+    public class Timing
+    {
+        public Timing(string eventName, TimeSpan? elapsedTime)
+        {
+            EventName = eventName;
+            ElapsedTime = elapsedTime?.ToCanonicString();
+        }
+
+        public string EventName { get; }
+        public string ElapsedTime { get; }
+    }
+}

src/Startup/StartupPerformance/StartupPerformance/Services/IProfilerService.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace StartupPerformance.Services
+{
+    public interface IProfilerService
+    {
+        void RegisterEvent(string eventName);
+        Task<Dictionary<string, TimeSpan?>> GetTimingsSinceStartup();
+        DateTime? GetStartupTime();
+    }
+}

src/Startup/StartupPerformance/StartupPerformance/StartupPerformance.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <ProduceAssemblyReference>true</ProduceAssemblyReference>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <DebugType>pdbonly</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.0.0.425677" />  
+    <PackageReference Include="Xamarin.Essentials" Version="1.1.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Update="Views\MainView.xaml">
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
+  </ItemGroup>
+</Project>

src/Startup/StartupPerformance/StartupPerformance/ViewModels/MainViewModel.cs

@@ -0,0 +1,52 @@
+using StartupPerformance.Models;
+using StartupPerformance.Services;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace StartupPerformance.ViewModels
+{
+    public class MainViewModel : BindableObject
+    {
+        private string _startupTime;
+        private List<Timing> _timings;
+
+        private readonly IProfilerService _profilerService;
+
+        public MainViewModel(IProfilerService profilerService)
+        {
+            _profilerService = profilerService;
+        }
+
+        public string StartupTime
+        {
+            get => _startupTime;
+            set
+            {
+                _startupTime = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public List<Timing> Timings
+        {
+            get => _timings;
+            set
+            {
+                _timings = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public async Task LoadDataAsync()
+        {
+            StartupTime = _profilerService.GetStartupTime()?.ToLocalTime().ToString() ?? "-";
+            var timings = await _profilerService.GetTimingsSinceStartup();
+
+            Timings = timings
+                .Select(t => new Timing(t.Key, t.Value))
+                .ToList();
+        }
+    }
+}

src/Startup/StartupPerformance/StartupPerformance/Views/MainView.xaml

@@ -0,0 +1,65 @@
+<?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="StartupPerformance.Views.MainView">
+    <ContentPage.Content>
+        <Grid>
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto" />
+                <RowDefinition Height="200" />
+            </Grid.RowDefinitions>
+            <Label 
+                Grid.Row="0"
+                Text="Performance Results"
+                FontSize="18"
+                Margin="10"/>
+            <Frame
+                Grid.Row="1"
+                Padding="10">
+                <StackLayout>
+                    <StackLayout Orientation="Horizontal">
+                        <Label 
+                            Text="App Startup Time:"
+                            FontSize="12"
+                            WidthRequest="100"/>
+                        <Label 
+                            FontSize="12" 
+                            FontAttributes="Bold"
+                            Text="{Binding StartupTime}"/>
+                    </StackLayout>
+                    <Label 
+                        Text="Timings since startup:"
+                        FontSize="12" 
+                        FontAttributes="Bold"/>
+                    <ListView 
+                        ItemsSource="{Binding Timings}" 
+                        SelectionMode="None"
+                        SeparatorVisibility="None"
+                        HasUnevenRows="True"
+                        Margin="10,0,0,0">
+                        <ListView.ItemTemplate>
+                            <DataTemplate>
+                                <ViewCell>
+                                    <StackLayout
+                                        Orientation="Horizontal"
+                                        HeightRequest="18">
+                                        <Label 
+                                            Text="{Binding EventName}"
+                                            FontSize="12"
+                                            VerticalOptions="Center"
+                                            WidthRequest="220"/>
+                                        <Label
+                                            Text="{Binding ElapsedTime}" 
+                                            FontSize="12"
+                                            VerticalOptions="Center"
+                                            FontAttributes="Bold"/>
+                                    </StackLayout>
+                                </ViewCell>
+                            </DataTemplate>
+                        </ListView.ItemTemplate>
+                    </ListView>
+                </StackLayout>
+            </Frame>
+        </Grid>
+    </ContentPage.Content>
+</ContentPage>

src/Startup/StartupPerformance/StartupPerformance/Views/MainView.xaml.cs

@@ -0,0 +1,21 @@
+using StartupPerformance.Services;
+using StartupPerformance.ViewModels;
+using Xamarin.Forms;
+
+namespace StartupPerformance.Views
+{
+    public partial class MainView : ContentPage
+    {
+        public MainView()
+        {
+            InitializeComponent();
+            BindingContext = new MainViewModel(DependencyService.Get<IProfilerService>());
+        }
+
+        protected override async void OnAppearing()
+        {
+            base.OnAppearing();
+            await (BindingContext as MainViewModel).LoadDataAsync();
+        }
+    }
+}