add abstract base class in java world to access OSRemoteNotificationReceivedHandler

Author: tmijieux

OneSignal.Android.Binding/Jars/onesignal-release.aar

@@ -10,7 +10,7 @@
     <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
     <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
     <AssemblyName>OneSignal.Android.Binding</AssemblyName>
-    <TargetFrameworkVersion>v11.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v12.0</TargetFrameworkVersion>
     <AndroidSdkBuildToolsVersion Condition="'$(AndroidSdkBuildToolsVersion)' == ''">28.0.3</AndroidSdkBuildToolsVersion>
     <AndroidTlsProvider></AndroidTlsProvider>
     <AndroidClassParser>class-parse</AndroidClassParser>
@@ -55,5 +55,8 @@
   <ItemGroup>
     <LibraryProjectZip Include="Jars\onesignal-release.aar" />
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.AndroidX.Core" Version="1.12.0.2" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.Bindings.targets" />
-</Project>
+</Project>

OneSignal.Android.Binding/OneSignal.Android.Binding.csproj

@@ -4,7 +4,7 @@
   and Fragment_tag from android.support.v4.app.FragmentActivity.FragmentTag
   to an enum called Android.Support.V4.App.FragmentTagType with values
   Id, Name, and Tag.
-  
+
   <mapping clr-enum-type="Android.Support.V4.App.FragmentTagType" jni-class="android/support/v4/app/FragmentActivity$FragmentTag">
     <field clr-name="Id" jni-name="Fragment_id" value="1" />
     <field clr-name="Name" jni-name="Fragment_name" value="0" />

OneSignal.Android.Binding/Transforms/EnumFields.xml

@@ -0,0 +1,17 @@
+using System;
+using System.Diagnostics;
+using Android.App;
+using Android.Content;
+
+namespace Com.OneSignal.Android
+{
+    [Serializable]
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+    public sealed class NotificationExtensionAttribute : Attribute, Java.Interop.IJniNameProviderAttribute
+    {
+        public string Name { get; set; }
+        public NotificationExtensionAttribute()
+        {
+        }
+    }
+}

OneSignalSDK.Xamarin.Android/NotificationExtensionAttribute.cs

@@ -284,6 +284,7 @@
     </Compile>
     <Compile Include="Utilities\NativeConversion.cs" />
     <Compile Include="OneSignalCallbacks.cs" />
+    <Compile Include="NotificationExtensionAttribute.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\OneSignal.Android.Binding\OneSignal.Android.Binding.csproj">
@@ -371,4 +372,4 @@
   <Import Project="..\packages\Xamarin.Jetbrains.Annotations.22.0.0.2\build\monoandroid90\Xamarin.Jetbrains.Annotations.targets" Condition="Exists('..\packages\Xamarin.Jetbrains.Annotations.22.0.0.2\build\monoandroid90\Xamarin.Jetbrains.Annotations.targets')" />
   <Import Project="..\packages\Xamarin.Kotlin.StdLib.1.5.31.2\build\monoandroid90\Xamarin.Kotlin.StdLib.targets" Condition="Exists('..\packages\Xamarin.Kotlin.StdLib.1.5.31.2\build\monoandroid90\Xamarin.Kotlin.StdLib.targets')" />
   <Import Project="..\packages\Xamarin.Kotlin.StdLib.Common.1.5.31.2\build\monoandroid90\Xamarin.Kotlin.StdLib.Common.targets" Condition="Exists('..\packages\Xamarin.Kotlin.StdLib.Common.1.5.31.2\build\monoandroid90\Xamarin.Kotlin.StdLib.Common.targets')" />
-</Project>
+</Project>