Just some ideas for the custom button & joystick event listener

src/control/Button.java

@@ -0,0 +1,16 @@
+package control;
+
+import com.pi4j.io.gpio.GpioFactory;
+import com.pi4j.io.gpio.GpioPinDigitalInput;
+import com.pi4j.io.gpio.Pin;
+
+public class Button {
+	private GpioPinDigitalInput input;
+	
+	public Button(int buttonId, Pin pin){
+		input = GpioFactory.getInstance().provisionDigitalInputPin(pin , "Button:"+buttonId);
+	}
+	public boolean getState(){
+		return input.getState().isLow();
+	}
+}

src/control/ButtonEvent.java

@@ -0,0 +1,28 @@
+package control;
+
+public class ButtonEvent {
+	private Button button;
+	private Long now;
+	
+	public ButtonEvent(Button button, Long now){
+		this.button = button;
+		this.now = now;
+	}
+
+	/**
+	 * @return the button
+	 */
+	public Button getButton() {
+		return button;
+	}
+
+	/**
+	 * @return the time when event was triggered
+	 */
+	public Long getNow() {
+		return now;
+	}	
+	
+	
+	
+}

src/control/ButtonsListener.java

@@ -0,0 +1,21 @@
+package control;
+
+import java.util.EventListener;
+
+public interface ButtonsListener extends EventListener {
+	
+	/**
+	 * Invoked when a button has been pressed.
+	 */
+	public void buttonPressed(ButtonEvent e);
+		
+	/**
+	 * Invoked when a button has been released.
+	 */
+	public void buttonReleased(ButtonEvent e);
+	
+	/**
+	 * Invoked when a button is held down.
+	 */
+	public void buttonHeld(ButtonEvent e); 
+}

src/control/Buttontest.java

@@ -1,5 +1,8 @@
 package control;
 
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyListener;
+
 import com.pi4j.io.gpio.GpioController;
 import com.pi4j.io.gpio.GpioFactory;
 import com.pi4j.io.gpio.GpioPinDigitalInput;

src/control/JoystickListener.java

@@ -0,0 +1,10 @@
+package control;
+
+import java.util.EventListener;
+
+public interface JoystickListener extends EventListener {
+	/**
+	 * Invoked when the joystick has been moved.
+	 */
+	public void joystickMoved(Joystickevent e);
+}

src/control/Joystickevent.java

@@ -0,0 +1,5 @@
+package control;
+
+public class Joystickevent {
+
+}