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libgdx-maven-archetype

This is a Maven archetype for creating libGDX game projects.

Installing

The archetype is not yet available via Maven Central, so you'll have to build and install it before you can use it to generate skeleton projects. Do that like so:

% git clone git://github.com/libgdx/libgdx-maven-archetype.git
% cd libgdx-maven-archetype
% mvn install

Once it's installed, you can delete the libgdx-maven-archetype directory that you checked out. You don't need it any more.

Creating a skeleton project

Creating a project using the archetype is accomplished like so:

% mvn archetype:generate \
    -DarchetypeRepository=local \
    -DarchetypeRepository=$HOME/.m2/repository \
    -DarchetypeGroupId=com.badlogic.gdx \
    -DarchetypeArtifactId=gdx-archetype \
    -DarchetypeVersion=1.2.0

This will then ask you a few questions:

• Define value for property 'groupId': : com.mytest
• Define value for property 'artifactId': : mygame
• Define value for property 'version': 1.2.0: :
• Define value for property 'package': com.mytest: :
• Define value for property 'JavaGameClassName': : MyGame

The parts in bold above are the things we typed in. You can pick whatever you want for groupId and artifactId, though it's customary for groupId to be a reverse domain name for a domain that you own, and for artifactId to be a simple lowercase name that identifies your project.

version defaults to 1.0-SNAPSHOT but you can make it whatever you want. It's not used anywhere, and you're not going to be publishing your game via Maven, so it doesn't really matter.

package will be the main Java package for your game project, and JavaGameClassName will be the name of the Java class that is the entry point to your game. If you use the values we show above, your main class will be com.mytest.core.MyGame. The archetype puts your game code into a package named core (on top of the package you specify) because of the way the HTML backend works. You can change it later if you want, but you'll need to do some fiddling if you use the HTML backend.

Once you enter all that info, Maven will ask you to confirm your choices and then it generates your new skeleton game in a directory named whatever you specified for artifactId (in our example that's mygame).

Running your skeleton project

We'll use the names we used in the above example here, so substitute in the names you actually used.

Build and run the Desktop backend

You can build and run your game using the Desktop backend like this:

% cd mygame
% mvn integration-test -Pdesktop

This is pretty simple. It builds the Java code, and then unpacks some native libraries into the right place and then runs the code.

You can also build a single jar file version of your game that you can send to friends or do whatever you like with:

% cd mygame
% mvn package -Pdesktop
% java -jar desktop/target/mygame-desktop-1.0-SNAPSHOT-jar-with-dependencies.jar

Build and run the HTML backend

You can build and run your game using the HTML backend like this:

% cd mygame
% mvn integration-test -Phtml

This compiles the game using GWT and then runs a local web server that serves up the compiled game on http://localhost:8080. Point a web browser at that URL to test your HTML compiled game.

You can also just build the HTML version of the game so that you can copy it to a website or whatever. This is done like so:

% cd mygame
% mvn package -Phtml

This will generate your game in html/target/webapp. The important files and directories in that directory are: assets, index.html and mygame. The other cruft (META-INF and WEB-INF) you can ignore, unless you want to deploy your game as a webapp to somewhere like Google App Engine.

Build and run the Android backend

You can build your game using the Android backend and install it to a device like this:

% cd mygame
% mvn install -Pandroid

You can also easily build a signed and zipaligned APK for your Android game when you are preparing to upload it to Google Play. You need to edit your android/pom.xml and change:

    <sign.keystore>game.keystore</sign.keystore>
    <keystore.alias>game</keystore.alias>

to reflect path to your keystore file and the alias of the key you will use to sign your APK. Then you can build a signed and zipaligned APK like so:

% cd mygame
% mvn package -Pandroid -Psign -Dkeystore.password=foo

The signed and aligned APK file will be in android/target/mygame-android-aligned.apk.

Build and run the iOS backend

This assumes you have Xamarin.iOS installed, as that is currently required to build your game for iOS.

Building the iOS backend is currently TBD. Check back later!

Credits

Much of this archetype was adapted from PlayN's archetype.