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[Mono.Android] Generate default interface members for API-30+. - #4353
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gugavaro
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Context: dotnet/java-interop#509 Use `generator --lang-features=default-interface-methods` so that we start binding [Java interface default methods][0] within `android.jar` and `Mono.Android.dll`, for API-R. *Note*: `Microsoft.DotNet.ApiCompat.exe` does not currently understand C#8 [default interface members][1], which we use to bind Java interface default methods. As such, it reports an error for *every added* default interface member, e.g. InterfacesShouldHaveSameMembers : Interface member 'Android.App.Application.IActivityLifecycleCallbacks.OnActivityPostCreated(Android.App.Activity, Android.OS.Bundle)' is present in the implementation but not in the contract. We are investigating improving `Microsoft.DotNet.ApiCompat.exe` so that it doesn't report such changes as incompatible. [0]: https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html [1]: https://github.com/dotnet/csharplang/blob/f7952cdddf85316a4beec493a0ecc14fcb3241c8/proposals/csharp-8.0/default-interface-methods.md
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Context: dotnet/java-interop#509
Using the new features provided by C#8 to provide bindings that mirror the original Java
android.jarmore closely.Step 1 - Default Interface Members
Enable
--lang-features=default-interface-methodsto start generatingdefaultmethods on all interfaces inMono.Android.dllAPI-30+.