Testing code

DummyLibrary/DummyLibrary.Android/Class1.cs

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+using System;
+
+namespace DummyLibrary
+{
+    public class Class1
+    {
+        public static string Library => "Android";
+    }
+}

DummyLibrary/DummyLibrary.Android/DummyLibrary.Android.csproj

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+<?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)' == '' ">AnyCPU</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{7962520B-BF49-4C5B-84FB-47E55BBABB94}</ProjectGuid>
+    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{9ef11e43-1701-4396-8835-8392d57abb70}</TemplateGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>DummyLibrary</RootNamespace>
+    <AssemblyName>DummyLibrary</AssemblyName>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>True</Deterministic>
+    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
+    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
+    <AndroidUseLatestPlatformSdk>false</AndroidUseLatestPlatformSdk>
+    <TargetFrameworkVersion>v9.0</TargetFrameworkVersion>
+    <AndroidUseAapt2>true</AndroidUseAapt2>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>portable</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="Mono.Android" />
+    <Reference Include="mscorlib" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Class1.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
+</Project>

DummyLibrary/DummyLibrary.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("DummyLibrary.Android")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("DummyLibrary.Android")]
+[assembly: AssemblyCopyright("Copyright ©  2018")]
+[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")]

DummyLibrary/DummyLibrary.NetStandard/Class1.cs

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+using System;
+
+namespace DummyLibrary
+{
+    public class Class1
+    {
+        public static string Library => ".NET Standard";
+    }
+}

DummyLibrary/DummyLibrary.NetStandard/DummyLibrary.NetStandard.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <RootNamespace>DummyLibrary</RootNamespace>
+    <AssemblyName>DummyLibrary</AssemblyName>
+  </PropertyGroup>
+
+</Project>

DummyLibrary/DummyLibrary.iOS/Class1.cs

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+using System;
+
+namespace DummyLibrary
+{
+    public class Class1
+    {
+        public static string Library => "iOS";
+    }
+}

DummyLibrary/DummyLibrary.iOS/DummyLibrary.iOS.csproj

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+<?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)' == '' ">AnyCPU</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{0F5F2B20-F8F0-4E85-845A-CA3B90BB9C7B}</ProjectGuid>
+    <ProjectTypeGuids>{FEACFBD2-3405-455C-9665-78FE426C6842};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{a52b8a63-bc84-4b47-910d-692533484892}</TemplateGuid>
+    <OutputType>Library</OutputType>
+    <RootNamespace>DummyLibrary</RootNamespace>
+    <AssemblyName>DummyLibrary</AssemblyName>
+    <IPhoneResourcePrefix>Resources</IPhoneResourcePrefix>
+    <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
+  </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>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>portable</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Xml" />
+    <Reference Include="System.Core" />
+    <Reference Include="Xamarin.iOS" />
+  </ItemGroup>
+  <ItemGroup />
+  <ItemGroup>
+    <Compile Include="Class1.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
+</Project>

DummyLibrary/DummyLibrary.iOS/Properties/AssemblyInfo.cs

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+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("DummyLibrary.iOS")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("DummyLibrary.iOS")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[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("50c7b8c9-e664-45af-b88e-0c9b8b9c1be1")]
+
+// 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")]

DummyLibrary/DummyLibrary.nuspec

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+<?xml version="1.0"?>
+<package >
+  <metadata>
+    <id>DummyLibrary</id>
+    <version>1.0.0</version>
+    <authors>matthew</authors>
+    <owners>matthew</owners>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>Dummy package description</description>
+    <copyright>Copyright 2019</copyright>
+    <dependencies>
+      <group targetFramework="netstandard1.0" />
+      <group targetFramework="monoandroid1.0" />
+      <group targetFramework="xamarinios1.0" />
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="DummyLibrary.NetStandard\bin\Debug\netstandard2.0\DummyLibrary.dll" target="ref\netstandard1.0\DummyLibrary.dll" />
+    <file src="DummyLibrary.Android\bin\Debug\DummyLibrary.dll" target="lib\monoandroid1.0\DummyLibrary.dll" />
+    <file src="DummyLibrary.iOS\bin\Debug\DummyLibrary.dll" target="lib\xamarinios1.0\DummyLibrary.dll" />
+  </files>
+</package>

DummyLibrary/DummyLibrary.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29505.209
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DummyLibrary.iOS", "DummyLibrary.iOS\DummyLibrary.iOS.csproj", "{0F5F2B20-F8F0-4E85-845A-CA3B90BB9C7B}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DummyLibrary.NetStandard", "DummyLibrary.NetStandard\DummyLibrary.NetStandard.csproj", "{177808E0-B444-4672-8179-69321FF63B3B}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DummyLibrary.Android", "DummyLibrary.Android\DummyLibrary.Android.csproj", "{7962520B-BF49-4C5B-84FB-47E55BBABB94}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{0F5F2B20-F8F0-4E85-845A-CA3B90BB9C7B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0F5F2B20-F8F0-4E85-845A-CA3B90BB9C7B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0F5F2B20-F8F0-4E85-845A-CA3B90BB9C7B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0F5F2B20-F8F0-4E85-845A-CA3B90BB9C7B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{177808E0-B444-4672-8179-69321FF63B3B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{177808E0-B444-4672-8179-69321FF63B3B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{177808E0-B444-4672-8179-69321FF63B3B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{177808E0-B444-4672-8179-69321FF63B3B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7962520B-BF49-4C5B-84FB-47E55BBABB94}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7962520B-BF49-4C5B-84FB-47E55BBABB94}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7962520B-BF49-4C5B-84FB-47E55BBABB94}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7962520B-BF49-4C5B-84FB-47E55BBABB94}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D1BCD623-085A-4849-AE0F-5D4DA4B899C8}
+	EndGlobalSection
+EndGlobal

NuGetFoldersTest/Directory.Build.props

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+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+    <PropertyGroup>
+        <RestoreNoCache>true</RestoreNoCache>
+        <RestorePackagesPath>$(MSBuildThisFileDirectory)packages</RestorePackagesPath>
+    </PropertyGroup>
+</Project>

NuGetFoldersTest/NuGetFoldersTest.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 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");

NuGetFoldersTest/NuGetFoldersTest.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;
+
+namespace NuGetFoldersTest.Droid
+{
+    [Activity(Label = "NuGetFoldersTest", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
+    public class MainActivity : global::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);
+            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);
+        }
+    }
+}