Android 8.1 include aar in AOSP

[George Vlahakis]

I need to add a couple of aar's in system/framework folder to be available by the custom device developers to use in their applications.

I have already managed to compile and include normal JAR files to this folder during AOSP build, but I am having trouble figuring out what needs to be the content of my Android.mk file to copy pre-built aar files to the system/framework.

Already added them in PRODUCT_BOOT_JARS.

Sample of my Android.mk:

include $(CLEAR_VARS)

LOCAL_MODULE := moduleName

LOCAL_SRC_FILES := moduleName.aar

LOCAL_MODULE_CLASS := JAVA_LIBRARIES

LOCAL_MODULE_SUFFIX := .aar

include $(BUILD_PREBUILT)

If I mm in the directory it creates the intermediates correctly but does not copy the result to the final image /system/framework

[Luis Neri]

Thanks ,🙏

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[George Vlahakis]

Dear all,

I found that adding the module name to PRODUCT_PACKAGES at least copies the aar files in the target folder.

I do not know if it will now be possible to dynamically load the aar (like a jar) and use it in an APK. Will try and report with in.

Thanks

[George Vlahakis]

Another update:

The aar ends up in the system/framework as expected. However, when I build an APK (using compileOnly linking to the aar for development) and then run it on the device, when I try to reference a simple class from the aar I get a ClassNotFound exception.

Didn't find class "blahblah" on path: DexPathList[[zip file "/data/app/blahblah-alZcI7F0c4pu3uaE3oKynw==/base.apk"],nativeLibraryDirectories=[/data/app/blahblah-alZcI7F0c4pu3uaE3oKynw==/lib/arm, /system/lib, /vendor/lib]]

I would have thought that having the package in PRODUCT_BOOT_JARS it would have added the aar file to the class path and would have allowed referencing it.

I read somewhere that aar files are not applicable for loading this way... 

[George Vlahakis]

And the point around not being about to load classes runtime from a an aar: https://stackoverflow.com/questions/48716303/how-to-load-class-dynamically-from-aar-file-with-dexclassloader

The above principal at least should work for a jar file only... (for my needs I should be able to strip down to a jar file instead of aar).

I think to add resources to this approach one would need to overlay the framework's resources (out of scope for my needs)