touchpad example

package com.me.mygdxgame.screens;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.InputMultiplexer;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Animation;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.maps.tiled.TiledMap;
import com.badlogic.gdx.maps.tiled.TiledMapTileLayer;
import com.badlogic.gdx.maps.tiled.TmxMapLoader;
import com.badlogic.gdx.maps.tiled.renderers.OrthogonalTiledMapRenderer;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.ui.ImageButton;
import com.badlogic.gdx.scenes.scene2d.ui.ImageButton.ImageButtonStyle;
import com.badlogic.gdx.scenes.scene2d.ui.Skin;
import com.badlogic.gdx.scenes.scene2d.ui.Touchpad;
import com.badlogic.gdx.scenes.scene2d.ui.Touchpad.TouchpadStyle;
import com.badlogic.gdx.scenes.scene2d.utils.ChangeListener;
import com.badlogic.gdx.scenes.scene2d.utils.ClickListener;
import com.badlogic.gdx.scenes.scene2d.utils.Drawable;
import com.badlogic.gdx.scenes.scene2d.utils.TextureRegionDrawable;
import com.badlogic.gdx.utils.Array;
import com.me.mygdxgame.entities.Player;

public class Play implements Screen {

    private Stage stage;

    @Override
    public void show() {
        stage = new Stage();
        Gdx.input.setInputProcessor(new InputMultiplexer(stage, player));

        // touchpad krams
        Skin touchpadSkin = new Skin();
        touchpadSkin.add("touchBackground", new Texture("img/touchBackground.png"));
        touchpadSkin.add("touchKnob", new Texture("img/touchKnob.png"));

        TouchpadStyle touchpadStyle = new TouchpadStyle();
        Drawable touchBackground = touchpadSkin.getDrawable("touchBackground");
        Drawable touchKnob = touchpadSkin.getDrawable("touchKnob");
        touchpadStyle.background = touchBackground;
        touchpadStyle.knob = touchKnob;

        Touchpad touchpad = new Touchpad(10, touchpadStyle);
        touchpad.setBounds(15, 15, 200, 200);
        touchpad.addListener(new ChangeListener() {

            @Override
            public void changed(ChangeEvent event, Actor actor) {
                Touchpad tpad = (Touchpad) actor;
                player.getVelocity().x = tpad.getKnobPercentX() * player.getSpeed();
                player.getVelocity().y = tpad.getKnobPercentY() * player.getSpeed();
            }

        });

        // add to stage
        stage.addActor(touchpad);
    }