libGDX Example Code

Minimum Code Setup

Copy the box2dlights.jar to your libGDX projects 'libs/' folder. Add box2dlights.jar to the projects Build Path.

Within your libGDX project source, add the following:

Globals

public RayHandler rayHandler;

create() or show()

this.rayHandler = new RayHandler(this.world);
RayHandler.setGammaCorrection(true);     // enable or disable gamma correction
RayHandler.useDiffuseLight(false);       // enable or disable diffused lighting
this.rayHandler.setBlur(true);           // enabled or disable blur
this.rayHandler.setBlurNum(1);           // set number of gaussian blur passes
this.rayHandler.setShadows(true);        // enable or disable shadow
this.rayHandler.setCulling(true);        // enable or disable culling
this.rayHandler.setAmbientLight(0.9f);   // set default ambient light

// Two different ways to create a PointLight
new PointLight(rayHandler, 500, Color.RED, 50, -5, 10);
new PointLight(rayHandler, 500, new Color(1f, 0.5f, 1f, 1f), 150, 0, 30);

render()
Be sure to call this after the objects you wish to render shadows for and NOT inside begin/end statements.

this.rayHandler.setCombinedMatrix(this.camera.combined);		
this.rayHandler.updateAndRender();		

An example of using Box2dLight on LibGDX.info