[CMake] CMake for Android projects

Thu May 8 09:43:48 EDT 2014

So basically I am thinking of doing this:

1. Build my NDK libraries using the android cmake toolchain file as if
I'm just building normal C++ libraries on Linux with the CMake
provided makefiles in the binary output directory.
2. Create a Java project using the 'android create project' tool and
check that into version control. The 'libs' directory will be empty.
3. When building the NDK libraries, "install" them to the
corresponding libs directory for that java project (I may need to
install the same library multiple times if multiple java projects
depend on it).
4. Run 'ant' by hand to build the java project.

Likewise I think I can import all projects into eclipse: Import the
cmake build directory, and then each project in the source tree for
the java side. That way I can work with it all together in the same
IDE.

Does this sound feasible or am I missing steps?

On Wed, May 7, 2014 at 10:10 PM, J Decker <d3ck0r at gmail.com> wrote:
> by putting them in a directory <lib/<cputype>
>
>
>
> On Wed, May 7, 2014 at 5:19 PM, Robert Dailey <rcdailey.lists at gmail.com>
> wrote:
>>
>> How do I tell my android Java project where the *.so files are so it
>> can package them into the APK for dynamic loading when I call
>> System.loadlibrary() on the SO files?
>>
>> On Tue, May 6, 2014 at 6:59 PM, Eric Wing <ewmailing at gmail.com> wrote:
>> > So I have 4 examples I actually tried to document.
>> > These all use my fork/derivative of the Android-CMake toolchain, which
>> > I believe comes from OpenCV. (It had grown stale with later NDKs and I
>> > hit problems). All of these rely heavily on the external NDK module
>> > system (NDK_MODULE_PATH).
>> >
>> > The first and easiest (most self contained) is:
>> > https://bitbucket.org/ewing/hello-android-almixer
>> > This one invokes ant via shell scripts outside CMake.
>> >
>> > I then recently got SDL building with CMake using the same techniques.
>> > https://bitbucket.org/ewing/sdl_android_cleanup
>> > This one doesn't invoke ant because it builds only a library. There
>> > was actually an intermediate project I helped build after ALmixer that
>> > this also drew from, JavaScriptCore, and I documented my procedure
>> > here:
>> >
>> > https://github.com/appcelerator/hyperloop/wiki/Building-JavaScriptCore-for-Android
>> >
>> >
>> > Once you have SDL built, and you set your NDK_MODULE_PATH directly, I
>> > have an Ant example and Gradle example. The ant one is just like
>> > Hello-Android-ALmixer.
>> > https://bitbucket.org/ewing/helloandroidsdl-ant
>> > https://bitbucket.org/ewing/helloandroidsdl-gradle
>> >
>> > The Gradle one is a lot of hacks. Google is ditching Ant/Eclipse for
>> > Gradle/IntelliJ, but their NDK support is even worse in the latter
>> > right now.
>> >
>> > Again, once you leave the NDK, all these things live outside CMake. I
>> > think it would be interesting to make CMake handle all of this, but I
>> > can't visualize it yet. But I hope others might be able to build on my
>> > work, like how I've built on Android-CMake.
>> >
>> > An aside, I noticed Gradle is painfully slow. Depending on how one
>> > does CMake integration, I'm not sure I want it. Just to invoke it and
>> > for it to figure out no real work needs to be done is measured in
>> > seconds for me.
>> >
>> >
>> > Thanks,
>> > Eric
>> >
>> >
>> >
>> > On 5/6/14, J Decker <d3ck0r at gmail.com> wrote:
>> >> This is a page on building to android; mostly it's about my library,
>> >> but
>> >> names can be replaced where required
>> >>
>> >> https://code.google.com/p/c-system-abstraction-component-gui/wiki/BuildingForAndroid
>> >>
>> >> I went wit the separate cmake projects because I end up with multiple
>> >> android projects from the same libraries; but really it could be
>> >> appended
>> >> all-together
>> >>
>> >>
>> >> On Tue, May 6, 2014 at 2:32 PM, Robert Dailey
>> >> <rcdailey.lists at gmail.com>wrote:
>> >>
>> >>> Well to be clear, the NDK libraries are compiled in eclipse after I
>> >>> generate eclipse makefiles in CMake. Ideally, I want the CMake script
>> >>> to also configure "ant" execution so that it builds java and links in
>> >>> the NDK libraries. You say "just use the libraries", but I'm not sure
>> >>> what this looks like as far as CMake script is concerned.
>> >>>
>> >>> Also I think we're using the android glue stuff in our existing
>> >>> project, but I'm not really sure what android glue is or if it is
>> >>> relevant to the CMake setup.
>> >>>
>> >>> On Tue, May 6, 2014 at 2:45 PM, J Decker <d3ck0r at gmail.com> wrote:
>> >>> > If you've built the sources into libs, you can just use the lib; my
>> >>> sources
>> >>> > are much too complex of a tree for ndk to support to build as
>> >>> > sources..
>> >>> >
>> >>> > The java sources are compiled at the 'ant <debug/release' step...
>> >>> > there
>> >>> is a
>> >>> > step before that I do that is 'android.bat update project --target
>> >>> > "android-14" --path' which makes a few other files from the
>> >>> > build.xml.
>> >>> >
>> >>> >
>> >>> > On Tue, May 6, 2014 at 8:42 AM, Robert Dailey
>> >>> > <rcdailey.lists at gmail.com>
>> >>> > wrote:
>> >>> >>
>> >>> >> There is also the question of how to handle the NDK sources and
>> >>> >> integrate them into the eclipse workspace. For example, I believe
>> >>> >> NDK
>> >>> >> sources must be under the 'jni' directory, but they won't be
>> >>> >> structured that way in the source tree. So I'm not sure if the jni
>> >>> >> directory is required. I realize there's some reference material
>> >>> >> out
>> >>> >> there but I'm not sure what to pay attention to. Would be nice to
>> >>> >> get
>> >>> >> some overview steps that I can read along with the reference
>> >>> >> material
>> >>> >> so I know the order in which to look at things, essentially.
>> >>> >>
>> >>> >> On Tue, May 6, 2014 at 10:32 AM, Bill Hoffman
>> >>> >> <bill.hoffman at kitware.com
>> >>> >
>> >>> >> wrote:
>> >>> >> > You can look at what we did for VES:
>> >>> >> > http://www.kitware.com/blog/home/post/642
>> >>> >> >
>> >>> >> >
>> >>> >> > -Bill
>> >>> >> >
>> >>> >> >
>> >>> >> >
>> >>> >> > --
>> >>> >> >
>> >>> >> > Powered by www.kitware.com
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>> >>> >> > Please keep messages on-topic and check the CMake FAQ at:
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>> >>> >> >
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>> >>> >> Please keep messages on-topic and check the CMake FAQ at:
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>> >>> >>
>> >>> >> Kitware offers various services to support the CMake community. For
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>> >>> >> information on each offering, please visit:
>> >>> >>
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>> >>> >>
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>> >>> >
>> >>>
>> >>
>> >
>> >
>> > --
>> > Beginning iPhone Games Development
>> > http://playcontrol.net/iphonegamebook/
>> > --
>> >
>> > Powered by www.kitware.com
>> >
>> > Please keep messages on-topic and check the CMake FAQ at:
>> > http://www.cmake.org/Wiki/CMake_FAQ
>> >
>> > Kitware offers various services to support the CMake community. For more
>> > information on each offering, please visit:
>> >
>> > CMake Support: http://cmake.org/cmake/help/support.html
>> > CMake Consulting: http://cmake.org/cmake/help/consulting.html
>> > CMake Training Courses: http://cmake.org/cmake/help/training.html
>> >
>> > Visit other Kitware open-source projects at
>> > http://www.kitware.com/opensource/opensource.html
>> >
>> > Follow this link to subscribe/unsubscribe:
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>> --
>>
>> Powered by www.kitware.com
>>
>> Please keep messages on-topic and check the CMake FAQ at:
>> http://www.cmake.org/Wiki/CMake_FAQ
>>
>> Kitware offers various services to support the CMake community. For more
>> information on each offering, please visit:
>>
>> CMake Support: http://cmake.org/cmake/help/support.html
>> CMake Consulting: http://cmake.org/cmake/help/consulting.html
>> CMake Training Courses: http://cmake.org/cmake/help/training.html
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Follow this link to subscribe/unsubscribe:
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>