Bindings from `$(AndroidJavaSource)` don't work with Intellisense

[jpobst]

Android application type

Android for .NET (net6.0-android, etc.)

Affected platform version

.NET 7, VS 2022 17.4. 17.5 P2

Description

.NET 7's $(AndroidJavaSource) is great for simplifying several binding tasks. However, while it compiles on a build, the .cs files it generates do not get added to the files used by IntelliSense, and thus trying to consume the bindings is difficult because they do not show up in IntelliSense dropdowns and show as errors in the editor.

Looking at a design time build, this appears to be because they are never added to @(Compile) which is used by <Csc>:

For comparison, it appears we add Resources.designer.cs to @(Compile) when $(ManagedDesignTimeBuild)' == 'True'.

https://github.com/xamarin/xamarin-android/blob/8c24b8ff0b32e198311b75e3bbce904989504f7c/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets#L1076

Steps to Reproduce

1. dotnet new android
2. Add a .java file to the project
3. Attempt to consume the generated binding in the project

Minimal test case:
AndroidApp2.zip

Did you find any workaround?

No response

Relevant log output

No response

[dellis1972]

My gut says that AddBindingsToCompile is not being called during a Design Time Build.

[dellis1972]

Yup

Target "AddBindingsToCompile" skipped, due to false condition; ( '$(_AndroidGenerateManagedBindings)' == 'true' ) was evaluated as ( '' == 'true' ).

_AndroidGenerateManagedBindings is empty, probably because we are not evaluating it.
I'm not sure we want to do a Java build in the DTB though....
If its done already and the source has been generated the we should include it. But I'm not sure about doing a java compile at that time though.

[mohachouch]

Hi, we have the same problem in my company. it makes this feature totally unusable, don't wait for .net8. The release is scheduled for November it's too long for a bug fix. Thanks

[jonathanpeppers]

@mohachouch as a workaround, I think you can just put the .java file in a separate class library? Did you try that?

Then Intellisense should be able to use the compiled .dll on disk in that case.

[mohachouch]

@jonathanpeppers Thanks for tour Quick response. I tried to separate in a library but I had the same problem. I feel like it's more related to the new csproj format. I will try again tomorrow.

[jonathanpeppers]

I hit similar issues working on:

https://github.com/jonathanpeppers/spice/blob/main/src/Spice/Platforms/Android/Interop.java

I spent a little time on it, but I didn't see an immediately, easy fix.

[mohachouch]

Hi @jonathanpeppers,

I have the same bug with seperate class library : https://github.com/mohachouch/JavaBindingBug

The compilation is ok but intelisense not working for both

Thanks