KotlinAppWithXamarinDependency

A native Android app that consumes C# dependencies using Xamarin

Goals

Consume C# dependencies without a Xamarin app
Minimize Xamarin build time
Minimize use of Xamarin Studio/Visual Studio

Implementation

Integrates the following components supplied by XamarinDependency

Mono runtime
C# assemblies
Android Callable Wrappers

C# dependencies are supplied using C# classes that implement or extend Managed Callable Wrappers of Java or Kotlin interfaces or classes.

Native factory classes in Kotlin or Java supply implementations for the C# classes using Xamarin generated Android Callable Wrappers.

While it would also be possible to generate Android Callable Wrappers using the [Java.Interop.ExportAttribute], this method obtains better stacktraces for exceptions thrown in C#.

For example:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.roydammarell.kotlinappwithxamarindependency, PID: 1690
    android.runtime.JavaProxyThrowable: System.NullReferenceException: Testing C# NullReferenceException
     at XamarinDependency.Library.ExceptionXamarinService.ThrowNullReferenceException () [0x00001] in <34b5ec4fa70f4f66b8305c760c86d6e6>:0 
     at Com.Roydammarell.Xamarininterface.IExceptionServiceInvoker.n_ThrowNullReferenceException (System.IntPtr jnienv, System.IntPtr native__this) [0x0000a] in <0dbbbb0b237643739178979927a37579>:0 
       at (wrapper dynamic-method) System.Object:287cba4a-4292-4192-97c4-df75761b87a8 (intptr,intptr)
       at com.roydammarell.xamarindependency.ExceptionXamarinService.n_throwNullReferenceException(Native Method)
       at com.roydammarell.xamarindependency.ExceptionXamarinService.throwNullReferenceException(ExceptionXamarinService.java:30)
       at com.roydammarell.kotlinappwithxamarindependency.MainActivity$onCreate$1.onClick(MainActivity.kt:21)
       at android.view.View.performClick(View.java:5609)
       at android.view.View$PerformClick.run(View.java:22259)
       at android.os.Handler.handleCallback(Handler.java:751)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:154)
       at android.app.ActivityThread.main(ActivityThread.java:6077)
       at java.lang.reflect.Method.invoke(Native Method)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

The build is configured entirely in Gradle, with a stock MSBuild Xamarin build to insulate against breaking Xamarin updates.

While it would be possible to implement UI in Xamarin, the goal of this project is specifically to not have UI in Xamarin.

tylertinystone / kotlinappwithxamarindependency Goto Github PK