Add project files.

ZXingPortable/Class1.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ZXingPortable
+{
+    public class Class1
+    {
+    }
+}

ZXingPortable/Properties/AssemblyInfo.cs

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+using System.Resources;
+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("ZXingPortable")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ZXingPortable")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// 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")]

ZXingPortable/ZXingPortable.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <MinimumVisualStudioVersion>10.0</MinimumVisualStudioVersion>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{71ED82A6-1CBB-429C-831E-169F0ADD6E05}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <RootNamespace>ZXingPortable</RootNamespace>
+    <AssemblyName>ZXingPortable</AssemblyName>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TargetFrameworkProfile>Profile44</TargetFrameworkProfile>
+    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</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>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <!-- A reference to the entire .NET Framework is automatically included -->
+    <Reference Include="Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Xamarin.Forms.2.5.0.122203\lib\portable-win+net45+wp80+win81+wpa81\Xamarin.Forms.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="Xamarin.Forms.Platform, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Xamarin.Forms.2.5.0.122203\lib\portable-win+net45+wp80+win81+wpa81\Xamarin.Forms.Platform.dll</HintPath>
+    </Reference>
+    <Reference Include="Xamarin.Forms.Xaml, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Xamarin.Forms.2.5.0.122203\lib\portable-win+net45+wp80+win81+wpa81\Xamarin.Forms.Xaml.dll</HintPath>
+    </Reference>
+    <Reference Include="ZXing.Net.Mobile.Core, Version=2.4.1.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\ZXing.Net.Mobile.2.4.1\lib\netstandard1.0\ZXing.Net.Mobile.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="ZXing.Net.Mobile.Forms, Version=2.4.1.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\ZXing.Net.Mobile.Forms.2.4.1\lib\netstandard1.0\ZXing.Net.Mobile.Forms.dll</HintPath>
+    </Reference>
+    <Reference Include="zxing.portable, Version=0.16.2.0, Culture=neutral, PublicKeyToken=830ae994e36ac27d, processorArchitecture=MSIL">
+      <HintPath>..\packages\ZXing.Net.Mobile.2.4.1\lib\netstandard1.0\zxing.portable.dll</HintPath>
+    </Reference>
+    <Reference Include="ZXingNetMobile, Version=2.4.1.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\ZXing.Net.Mobile.2.4.1\lib\netstandard1.0\ZXingNetMobile.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Class1.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
+  <Import Project="..\packages\Xamarin.Forms.2.5.0.122203\build\portable-win+net45+wp80+win81+wpa81\Xamarin.Forms.targets" Condition="Exists('..\packages\Xamarin.Forms.2.5.0.122203\build\portable-win+net45+wp80+win81+wpa81\Xamarin.Forms.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\Xamarin.Forms.2.5.0.122203\build\portable-win+net45+wp80+win81+wpa81\Xamarin.Forms.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Xamarin.Forms.2.5.0.122203\build\portable-win+net45+wp80+win81+wpa81\Xamarin.Forms.targets'))" />
+  </Target>
+</Project>

ZXingPortable/packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Xamarin.Forms" version="2.5.0.122203" targetFramework="portable46-net451+win81" />
+  <package id="ZXing.Net.Mobile" version="2.4.1" targetFramework="portable46-net451+win81" />
+  <package id="ZXing.Net.Mobile.Forms" version="2.4.1" targetFramework="portable46-net451+win81" />
+</packages>

ZxingXamarinForms.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.572
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ZxingXamarinForms.Android", "ZxingXamarinForms\ZxingXamarinForms.Android\ZxingXamarinForms.Android.csproj", "{54346947-9EA4-4423-84E8-D58A90A2A49F}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ZxingXamarinForms", "ZxingXamarinForms\ZxingXamarinForms\ZxingXamarinForms.csproj", "{37F49F46-2E34-4714-9850-013C4DB60684}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{54346947-9EA4-4423-84E8-D58A90A2A49F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{54346947-9EA4-4423-84E8-D58A90A2A49F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{54346947-9EA4-4423-84E8-D58A90A2A49F}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{54346947-9EA4-4423-84E8-D58A90A2A49F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{54346947-9EA4-4423-84E8-D58A90A2A49F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{54346947-9EA4-4423-84E8-D58A90A2A49F}.Release|Any CPU.Deploy.0 = Release|Any CPU
+		{37F49F46-2E34-4714-9850-013C4DB60684}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{37F49F46-2E34-4714-9850-013C4DB60684}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{37F49F46-2E34-4714-9850-013C4DB60684}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{37F49F46-2E34-4714-9850-013C4DB60684}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{37F49F46-2E34-4714-9850-013C4DB60684}.Release|Any CPU.Build.0 = Release|Any CPU
+		{37F49F46-2E34-4714-9850-013C4DB60684}.Release|Any CPU.Deploy.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F8F53F19-9E5C-4BB7-B440-709709092E2E}
+	EndGlobalSection
+EndGlobal

ZxingXamarinForms/ZxingXamarinForms.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");

ZxingXamarinForms/ZxingXamarinForms.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 ZxingXamarinForms.Droid
+{
+    [Activity(Label = "ZxingXamarinForms", 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;
+            ZXing.Net.Mobile.Forms.Android.Platform.Init();
+            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);
+            global::ZXing.Net.Mobile.Android.PermissionsHandler.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+        }
+    }
+}

ZxingXamarinForms/ZxingXamarinForms.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" android:installLocation="auto">
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="27" />
+	<uses-permission android:name="android.permission.CAMERA" />
+	<uses-permission android:name="android.permission.FLASHLIGHT" />
+	<application android:label="ZxingXamarinForms.Android"></application>
+</manifest>

ZxingXamarinForms/ZxingXamarinForms.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("ZxingXamarinForms.Android")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ZxingXamarinForms.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)]

ZxingXamarinForms/ZxingXamarinForms.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.