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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.

Features

Warning
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:

  1. Simplified build support for Clojure using Android’s Ant-based build system, and

  2. The following Clojure libraries:

    • neko.compilation helps set up dynamic compilation.

    • neko.context helps retrieve resources from the application’s context.

    • neko.listeners contains namespaces that take the tedium to adding callback code to various widgets.

    • neko.log interns functions that make logging from your code clean and simple.

    • neko.threading will contain utilities to manage asynchronous tasks and working with UI threads.

Requirements

Using Neko requires the following:

Clojure

Stock Clojure version 1.2 will work on Android 2.2 (Froyo) and newer. Clojure 1.3 currently only works with Android 2.3 (Gingerbread) and newer.

Special versions of Clojure for Android development are available from two different branches in this repository on GitHub. These versions support dynamic compilation on an Android device. The android branch contains the latest development from both core Clojure and Android-specific work. However, it only supports Android 2.3 and up. The android-1.2.x branch is based off of Clojure 1.2.1 and supports Android versions since Android 2.1 (Eclair).

Android SDK Tools

Neko has been developed with the latest revision of the Android SDK tools, and is compatible with r14 and up of the Android SDK.

Warning
Revision 14 of the Android SDK introduced some major changes in the Ant build system. Neko has been updated to use the new build system. You will probably need to change your project if you have been using an older version of Neko/SDK. For more detailed information, check the Android Tools Project Site.
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.

Use

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.

Build support

To use Neko’s build support for Clojure, you will need to make two modifications to your project’s build.xml file.

  1. You must add a line to similar to the following before the line with <import file="${sdk.dir}/tools/ant/build.xml" />.

    <import file="/path/to/neko/build-support/clojure.xml"/>

    The important thing is that the value of the file attribute should resolve to the clojure.xml in the build-support directory of this repository. It may be either a relative or absolute path.

  2. You must find the line that reads <!-- version-tag: 1 --> and change the 1 to custom. If you do not do this, Android may overwrite your changes.

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.

Reflection warnings

To enable reflection warnings during compilation, simply set the clojure.warn.reflection property to true.

clojure.properties

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 your project’s build.properties file or in the clojure.properties file as described in the previous section.

Also, if you are developing an Android library project, you should add the following line to your build.properties file:

source.dir=src/java

This will ensure that your Clojure sources are not inadvertently included in any applications that use your library.

Libraries

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:

android.library.reference.1=/path/to/neko

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.

Copyright © 2011 Sattvik Software & Technology Resources, Ltd. Co.
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