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Easy Android Plugins
What is an Android Plugin for Unity
When coding in unity, you make your code in an intermediate language. That means that your
c sharp code (or unityscript, or boo) is gonna be translated to the target platform. The good
thing is that you only have one codebase for all platforms. The bad thing is that you lose the
specific features of every platform.
Unity tries to remedy that with the usage of plugins. Plugins are pieces of code that are coded
in the specific target platform. This pieces of code can be called from your unity code so you
can use the specific features of the desired platform. The plugins have to be coded in a way
that let you compile the code for that platform.
The basic building blocks of android projects are jar files, and one manifest file; when making
a plugin for Android, you are going to need at least one jar file. Let’s see how to do that.

Requirements
Before anything can be done. You must be sure you have the tools needed:
● Java JDK: This let you compile your java code into jar files.
● Android SDK: In order to be able to use the android framework you need the libs
provided by the Android SDK. Also, unity needs this tool to be able to form a resulting
apk.
Note that unity need these tools to make a valid apk android executable. So if you are able to
compile your android project in unity, you most likely have them configured properly.

How to make a plugin
To make a Unity plugin for android, you need:
● jar files with your android code compiled. They should be placed under
Plugins/Android folder.
● You can place an Android Manifest file in that same location if you want some
extra­features..
With ​
Easy Android Plugins​
editor extension, you can compile your java files directly from the
editor. This is how you do it:

Create project
Choose the folder you are going to use and place your .java code there. To be able to build
your jar file, you first need to create a ​
Java Project file​
. Then right click in the
directory­>Create java project. Be sure the desired root directory is selected.

An asset file will be created in that directory. The asset file have the configuration for the jar
file to be built. Change the name of the file according to the android plugin you are building.

Check out the project properties:
● Output_dir: the directory where your .jar file will be generated relative to your Assets
folder..
● Classpath: If your java code have any dependency to another jar file, you must add the
route to those jars in this list.

Build project
Next thing to do is to build the jar file. Select the Android code project file­>Right click­>Build
Java project.

All .java files under this directory are going to be included in the jar file.
Your project will be built into the target directory indicated by the ​
Java Project file​
(by default
is Plugins/Android). Also, the file name of the .jar file is going to be same name as the name
of the ​
Java Project File​
. Any existing .jar file with that name will be deleted and replaced with
the new version.
The real requirement when compiling your java code is the bootclasspath. The bootclasspath
is the file containing the basics of the android framework. This file is called android.jar and
comes with the android sdk. There is one android.jar with every platform installed (it’s under
android­sdk/platforms/android­version/android.jar). ​
Easy Android Plugins​
picks the latest
android.jar you have installed.

Building your Android application
One last thing remains: How to call the android code from your unity code (c sharp,
unityscript, boo).
You need a connector to call that code. Luckily, unity provides a few helper classes to do that.
Check out the example scene to see how to do that. Note that unity only executes the android
code when executing in an android platform. When executing your app/game in the editor
they are going to result in an error.

TL;DR
1. Place your java files in any folder.
2. Create a ​
Java Project file ​
in that folder: Select folder­>Right click­>Create Android
project
3. Build the project: Select ​
Java Project file​
­>Right click­>Build project
4. Make your unity connector to call the java code.
5. Build your Unity project.
6. Enjoy!
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