Neko: The Clojure/Android Toolkit
Neko is a toolkit designed to make Android development using Clojure easier and more fun. It accomplishes this by making adding Clojure support to your Android project easy and providing functional wrappers and alternatives to Android’s Java API.
Note that the libraries are under heavy development. APIs are subject to
change. In particular,
neko.threading will be changed.
The toolkit comes as two components:
- Simplified build support for Clojure using Android’s Ant-based build system, and
- The following Clojure libraries:
neko.compilationhelps set up dynamic compilation.
neko.contexthelps retrieve resources from the application’s context.
neko.listenerscontains namespaces that take the tedium to adding callback code to various widgets.
neko.loginterns functions that make logging from your code clean and simple.
neko.threadingwill contain utilities to manage asynchronous tasks and working with UI threads.
Using Neko requires the following:
- Clojure 1.2
- Other versions have not been tested. If you would like to use dynamic
compilation or support API level 7 (2.1/Eclair), you will need to use the
Clojure from branch
android-1.2.xavailable from this repository on GitHub.
- Android SDK Tools
- Neko has been developed with the latest revision of the Android SDK tools, but should generally be compatible with all recent versions.
- Android Platform SDK 7 (2.1/Eclair) or newer
- In order to maintain backwards-compatibility, Neko does not support any APIs for newer versions of the platform.
The following instructions should help you to add Clojure support to your project’s build and allow you to use the libraries within your application.
To use Neko’s build support for Clojure, you will need to modify your project’s
build.xml file by adding a line to similar to the following:
The important thing is that the value of the
file attribute should resolve
clojure.xml in the
built-support directory of this repository.
It may be either a relative or absolute path.
For most projects, that is all you have to do. So long as your Clojure source
files are in
src/clojure and you have placed a Clojure JAR file in
libs, Ant will now automatically find and compile all of your Clojure code.
To enable reflection warnings during compilation, simply set the
clojure.warn.reflection property to
You can place a
clojure.properties file in the same directory as the
clojure.xml file. This file will be sourced and used in any project in
which you have enabled Clojure support.
Test and library projects
If your project is a test or library project, you should not place a copy of
the Clojure library in the
libs directory. If you do this, when building
an application that uses your library or when building your test project, the
dx tool will fail due to multiple inclusions of the same Clojure classes.
In these circumstances, you should either set a
clojure.jar property in
build.properties file or in the
as described in the previous section.
Also, if you are developing an Android library project, you should add the
following line to your
This will ensure that your Clojure sources are not inadvertently included in any applications that use your library.
Neko is packaged as an Android library project. This makes it easy to add the
libraries to your application if you are using Android’s build system.
Essentially, all you have to do is add a line to your project’s
build.properties similar to the following:
Where the path is either absolute or relative and resolves to the base directory for Neko. To learn more about Android library projects, you can read the SDK documentation for referencing a library project in Eclipse or from the command line.
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