fix: Adding proguard rules to Sentry.Bindings.Android (getsentry#2450)

Author: bitsandfoxes

CHANGELOG.md

@@ -9,6 +9,7 @@
 
 ### Fixes
 
+- Builds targeting Android with `r8` enabled no longer crash during SDK init. The package now contains the required proguard rules ([#2450]https://github.com/getsentry/sentry-dotnet/pull/2450)
 - Fix Sentry logger options for MAUI and Azure Functions ([#2423](https://github.com/getsentry/sentry-dotnet/pull/2423))
 
 ### Dependencies

samples/Sentry.Samples.Android/Sentry.Samples.Android.csproj

@@ -12,6 +12,12 @@
   <ItemGroup>
     <ProjectReference Include="..\..\src\Sentry\Sentry.csproj" />
     <Using Include="Android.App.Activity" Alias="Activity" />
+
+    <!--
+      The NuGet package the containing the binding comes with a .targets that sets the ProguardConfiguration
+      Since we're referencing the project itself we're grabbing the ProguardConfiguration from project directly.
+    -->    
+    <ProguardConfiguration Include="..\..\src\Sentry.Bindings.Android\sentry-proguard.cfg" />
   </ItemGroup>
 
   <!--

src/Sentry.Bindings.Android/Sentry.Bindings.Android.csproj

@@ -12,6 +12,8 @@
   <ItemGroup>
     <None Remove="$(MSBuildThisFileDirectory)..\..\README.md" />
     <None Include="$(MSBuildThisFileDirectory)README.md" Pack="true" PackagePath="" />
+    <None Include="$(MSBuildThisFileDirectory)build/Sentry.Bindings.Android.targets" Pack="true" PackagePath="build/$(TargetFramework)$(TargetPlatformVersion)/Sentry.Bindings.Android.targets" />
+    <None Include="$(MSBuildThisFileDirectory)sentry-proguard.cfg" Pack="true" PackagePath="" />
     <PackageReference Remove="SIL.ReleaseTasks" />
   </ItemGroup>
 

src/Sentry.Bindings.Android/build/Sentry.Bindings.Android.targets

@@ -0,0 +1,5 @@
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ProguardConfiguration Include="$(MSBuildThisFileDirectory)..\..\proguard.cfg" />
+  </ItemGroup>
+</Project>

src/Sentry.Bindings.Android/sentry-proguard.cfg

@@ -0,0 +1,8 @@
+# Because we use string-based lookups we need to keep names on selected sentry-java classes
+-keep class io.sentry.Sentry { *; }
+-keep class io.sentry.android.core.SentryAndroid { *; }
+-keep class io.sentry.android.core.SentryAndroidOptions { *; }
+-keep class io.sentry.android.core.SentryInitProvider { *; }
+-keep class io.sentry.android.core.SentryPerformanceProvider { *; }
+-keep class io.sentry.android.supplemental.* { *; }
+-keep class io.sentry.protocol.** { *; }