Merge pull request dotnet#339 from dotnet/custom_renderer_multi

Added custom renderer sample

Upgrading/CustomRenderer/MultiProject/Entry/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");

Upgrading/CustomRenderer/MultiProject/Entry/Android/CustomRenderer.Android.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseMaui>true</UseMaui>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup>
+    <TargetFramework>net8.0-android</TargetFramework>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\CustomRenderer\CustomRenderer.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.DotNet.UpgradeAssistant.Extensions.Default.Analyzers" Version="0.4.410601">
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+</Project>

Upgrading/CustomRenderer/MultiProject/Entry/Android/MainActivity.cs

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+using System;
+
+using Android.App;
+using Android.Content;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using Android.OS;
+using Android.Content.PM;
+using Microsoft.Maui;
+using Microsoft.Maui.Controls;
+
+
+namespace CustomRenderer.Android
+{
+	[Activity (Label = "CustomRenderer.Android.Android", Icon = "@drawable/icon", 
+		Theme = "@style/MainTheme", MainLauncher = true, 
+		ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
+	public class MainActivity : MauiAppCompatActivity
+	{
+	}
+
+}
+

Upgrading/CustomRenderer/MultiProject/Entry/Android/MainApplication.cs

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+using System;
+using Android.App;
+using Android.Runtime;
+using Microsoft.Maui;
+using Microsoft.Maui.Hosting;
+
+namespace CustomRenderer.Android
+{
+	[Application]
+	public class MainApplication : MauiApplication
+	{
+		public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+			: base(handle, ownership)
+		{
+		}
+
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

Upgrading/CustomRenderer/MultiProject/Entry/Android/MauiProgram.cs

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+using Microsoft.Maui.Hosting;
+using Microsoft.Maui.Handlers;
+using Microsoft.Maui.Controls.Compatibility.Hosting;
+
+namespace CustomRenderer.Android;
+
+public static class MauiProgram
+{
+	public static MauiAppBuilder builder;
+        public static MauiAppBuilder Builder
+        {
+            get
+            {
+                if (builder == null)
+                {
+                    builder = MauiApp.CreateBuilder();
+                }
+
+                return builder;
+            }
+        }
+	public static MauiApp CreateMauiApp()
+	{
+		var builder = Builder;
+		builder
+			.UseMauiCompatibility()
+			.UseMauiApp<App>();
+
+		builder.ConfigureMauiHandlers(handlers => {
+#if ANDROID
+			handlers.AddCompatibilityRenderer(typeof(MyEntry), typeof(CustomRenderer.Android.MyEntryRenderer));	
+#endif
+		});
+
+		return builder.Build();
+	}
+}

Upgrading/CustomRenderer/MultiProject/Entry/Android/MyEntryRenderer.cs

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+using CustomRenderer;
+using CustomRenderer.Android;
+using Android.Content;
+using Microsoft.Maui;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Compatibility.Platform.Android;
+using Microsoft.Maui.Controls.Platform;
+
+
+namespace CustomRenderer.Android
+{
+    class MyEntryRenderer : EntryRenderer
+    {
+        public MyEntryRenderer(Context context) : base(context)
+        {
+        }
+
+        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
+        {
+            base.OnElementChanged(e);
+
+            if (Control != null)
+            {
+                Control.SetBackgroundColor(global::Android.Graphics.Color.LightGreen);
+            }
+        }
+    }
+}
+

Upgrading/CustomRenderer/MultiProject/Entry/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="CustomRenderer.Android">
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29" />
+	<application android:label="CustomRenderer.Android">
+	</application>
+</manifest>

Upgrading/CustomRenderer/MultiProject/Entry/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.axml),
+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/
+        icon.png
+
+    layout/
+        main.axml
+
+    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 "R" 
+(this is an Android convention) that contains the tokens for each one of the resources 
+included. For example, for the above Resources layout, this is what the R class would expose:
+
+public class R {
+    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 R.layout.main 
+to reference the layout/main.axml file, or R.strings.first_string to reference the first 
+string in the dictionary file values/strings.xml.

Upgrading/CustomRenderer/MultiProject/Entry/Android/Resources/layout/Main.axml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    >
+<Button  
+    android:id="@+id/myButton"
+    android:layout_width="fill_parent" 
+    android:layout_height="wrap_content" 
+    android:text="@string/hello"
+    />
+</LinearLayout>
+

Upgrading/CustomRenderer/MultiProject/Entry/Android/Resources/values/Strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+	<string name="hello">Hello World, Click Me!</string>
+	<string name="app_name">CustomRenderer.Android.Android</string>
+</resources>

Upgrading/CustomRenderer/MultiProject/Entry/Android/Resources/values/colors.xml

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+<?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>

Upgrading/CustomRenderer/MultiProject/Entry/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>