Add .NET 6+ template for Android wear

Fixes dotnet#7003

This speaks for itself, lets add a template for Wear applications.

src/Microsoft.Android.Templates/android-wear/.template.config/template.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "http://json.schemastore.org/template",
+  "author": "Microsoft",
+  "classifications": [ "Android", "Mobile" ],
+  "identity": "Microsoft.Android.AndroidWearApp",
+  "name": "Android Wear Application",
+  "description": "A project for creating a .NET Android Wear application",
+  "shortName": "androidwear",
+  "tags": {
+    "language": "C#",
+    "type": "project"
+  },
+  "sourceName": "AndroidApp1",
+  "sources": [
+      {
+        "source": "./",
+        "target": "./",
+        "copyOnly": "**/Resources/**/*.png"
+      }
+  ],
+  "preferNameDirectory": true,
+  "primaryOutputs": [
+    { "path": "AndroidApp1.csproj" }
+  ],
+  "symbols": {
+    "packageName": {
+      "type": "parameter",
+      "description": "Overrides the package name in the AndroidManifest.xml",
+      "datatype": "string",
+      "replaces": "com.companyname.AndroidApp1"
+    },
+    "supportedOSVersion": {
+      "type": "parameter",
+      "description": "Overrides $(SupportedOSPlatformVersion) in the project",
+      "datatype": "string",
+      "replaces": "SUPPORTED_OS_PLATFORM_VERSION",
+      "defaultValue": "23"
+    }
+  },
+  "defaultName": "AndroidApp1"
+}

src/Microsoft.Android.Templates/android-wear/AndroidApp1.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net7.0-android</TargetFramework>
+    <SupportedOSPlatformVersion>SUPPORTED_OS_PLATFORM_VERSION</SupportedOSPlatformVersion>
+    <RootNamespace Condition="'$(name)' != '$(name{-VALUE-FORMS-}safe_namespace)'">AndroidApp1</RootNamespace>
+    <OutputType>Exe</OutputType>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <ApplicationId>com.companyname.AndroidApp1</ApplicationId>
+    <ApplicationVersion>1</ApplicationVersion>
+    <ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.AndroidX.Wear" Version="1.2.0.5" />
+    <PackageReference Include="Xamarin.AndroidX.PercentLayout" Version="1.0.0.14" />
+    <PackageReference Include="Xamarin.AndroidX.Legacy.Support.Core.UI" Version="1.0.0.14" />
+    <PackageReference Include="Xamarin.GooglePlayServices.Wearable" Version="117.1.0.5" />
+  </ItemGroup>
+</Project>

src/Microsoft.Android.Templates/android-wear/AndroidManifest.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0">
+	<uses-sdk android:minSdkVersion="23" android:targetSdkVersion="31" />
+	<uses-feature android:name="android.hardware.type.watch" />
+	<uses-permission android:name="android.permission.WAKE_LOCK" />
+	<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@android:style/Theme.DeviceDefault">
+		<uses-library android:name="com.google.android.wearable" android:required="true" />
+		<!--
+      Set to true if your app is Standalone, that is, it does not require the handheld
+      app to run.
+    -->
+		<meta-data android:name="com.google.android.wearable.standalone" android:value="true" />
+	</application>
+</manifest>

src/Microsoft.Android.Templates/android-wear/MainActivity.cs

@@ -0,0 +1,13 @@
+namespace AndroidApp1;
+
+[Activity(Label = "@string/app_name", MainLauncher = true)]
+public class MainActivity : Activity
+{
+    protected override void OnCreate(Bundle? savedInstanceState)
+    {
+        base.OnCreate(savedInstanceState);
+
+        // Set our view from the "main" layout resource
+        SetContentView(Resource.Layout.activity_main);
+    }
+}

src/Microsoft.Android.Templates/android-wear/Resources/AboutResources.txt

@@ -0,0 +1,44 @@
+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/
+        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" 
+(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 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 Resource.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/Microsoft.Android.Templates/android-wear/Resources/layout/activity_main.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.wear.widget.BoxInsetLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:padding="@dimen/box_inset_layout_padding"
+    tools:deviceIds="wear">
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:padding="@dimen/inner_frame_layout_padding"
+        app:boxedEdges="all">
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/apptext" />
+    </FrameLayout>
+</androidx.wear.widget.BoxInsetLayout>

src/Microsoft.Android.Templates/android-wear/Resources/values-round/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_text">Hello, Android!</string>
+</resources>

src/Microsoft.Android.Templates/android-wear/Resources/values/dimens.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!--
+    Because the window insets on round devices are larger than 15dp, this padding only applies
+    to square screens.
+    -->
+    <dimen name="box_inset_layout_padding">0dp</dimen>
+
+    <!--
+    This padding applies to both square and round screens. The total padding between the buttons
+    and the window insets is box_inset_layout_padding (above variable) on square screens and
+    inner_frame_layout_padding (below variable) on round screens.
+    -->
+    <dimen name="inner_frame_layout_padding">5dp</dimen>
+</resources>

src/Microsoft.Android.Templates/android-wear/Resources/values/strings.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">AndroidApp1</string>
+    <!--
+    This string is used for square devices and overridden by hello_world in
+    values-round/strings.xml for round devices.
+    -->
+    <string name="app_text">Hello, Android!</string>
+</resources>