I'd like to do Android development in Clojure, using the Cursive plugin in Android Studio. I've seen several posts where people have stated that it is possible, but I haven't been able to get it working.
When I try to build, I get errors reported where I'm trying to call Clojure from Java:
Error:(6, 18) error: package com.domain does not exist
Error:(15, 49) error: cannot find symbol variable tiny
Here's what I tried:
I already have Cursive running in IntelliJ with leiningen, building and running standalone Clojure apps
Start Android Studio, version 1.5.1
Create a new Android project. Selected API level 15, Empty Activity
Install Cursive plugin, as per this post:
Is it possible to get the Cursive Plugin installed with Android Studio?
Add clojure jar to classpath: Open module settings, dependencies, +Library Dependency, search for and select org.clojure:clojure:1.8.0-RC5
Switch from Android view to Project view, to create Clojure src directory: select app/src/main and create new directory clojure
The next step is to create a Clojure source file, which can be called from Java, using the example in this post: Calling clojure from java
Select src directory clojure, right-click New Clojure Namespace and enter: com.domain.tiny (to match the ns used in the example)
Paste the code from the example above into the new file (note that the ns in the new file was tiny and should have been com.domain.tiny)
It will say File tiny.clj is not under a source root so click on Add source root. Now we have both src/java and src/clojure set as src roots
Build the project. At this point it looks like everything is happy, no syntax errors in either the Java or Clojure code. We can deploy and run the (almost) empty Android project, and run a local REPL to load and test our Clojure code.
We want to call some Clojure code from Java, so add the following code to MainActivity (again, from the example above):
System.out.println("(binomial 5 3): " + tiny.binomial(5, 3));
System.out.println("(binomial 10042, 111): " + tiny.binomial(10042, 111));
Android Studio can find the package com.domain.tiny and the tiny class, no syntax errors, so looks good
Now try and build the project - at this point I get an error:
Error:(6, 18) error: package com.domain does not exist
Error:(15, 49) error: cannot find symbol variable tiny
At this point, I'm stuck. I'm guessing that even though the compiler is seeing the Clojure code ok, there's still something missing in the build process. Does leiningen need to be involved? If so, I don't know how, or what I might have to put in the project.clj configuration file.
Anyone have any ideas? Thanks!
Edit:
This appears to not be possible right now. This is because Android Studio requires projects to use Gradle, and the Clojure Gradle plugin is incompatible with the Android one. This may work in the future, but we couldn't make it work right now.
Original answer:
Thanks for the detailed issue. I guess that your Clojure code has to be AOT compiled for this to work. To enable this, check the settings under Settings->Build, Execution, Deployment->Compiler->Clojure Compiler. If you enable compilation for your Clojure namespaces, does that help?
Related
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I've tried a bunch of things (mostly ignorant) and keep getting the following message:
Gradle 'name' project refresh failed
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Is there a description on how to set up an Android Studio project to include source code and how to structure such a project?
or
Can you tell me what the message means and how to fix it?
Thanks.
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Updated Links 19-07-2016
maven {
url 'https://download.01.org/crosswalk/releases/crosswalk/android/maven2'
}
And In dependencies add this
compile 'org.xwalk:xwalk_core_library_beta:9.38.208.8'
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use the http://dl.google.com/eclipse/plugin/4.2 to install plugin on eclipse
instead of http://dl.google.com/eclipse/plugin/4.4 or 4.3
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fails with the error "the OutputPath property who is not set for project NameProject.csproj".
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Could someone please suggest what may be causing this problem?
Thanks a lot.
the exact error:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(9,9):
Error: The OutputPath property is not set for project 'helloWorld3.csproj'.
Please check to make sure that you have specified a valid combination of
Configuration and Platform for this project.
Configuration='Debug'
Platform='BPC'.
This error may also appear if some other project is trying to follow a
project-to-project reference to this project, this project has been
unloaded or is not included in the solution, and the referencing project
does not build using the same or an equivalent Configuration or Platform.
(helloWorld3)
I think we've seen this before. Your system manufacturer installed an environment variable called Platform onto your system. This breaks all msbuild based stuff, since msbuild automatically imports that as $(Platform), conflicting with the real $(Platform) that msbuild uses to compile.
Try removing the environment variable and try again.