[SOLVED?]Changed box2D Example, dont work!

[Andre_Lopes]

Hi Guys, im trying to make the Greenballs move at my Screen, but somehow it isnt showing up. But it compiles just fine.
I changed the example, to just show the balls on the screen.

Just the ground is drawned, the balls arent.

What am i doing wrong ?

package grassproject;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.CircleShape;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.PolygonShape;
import com.badlogic.gdx.physics.box2d.World;


public class App extends ApplicationAdapter {

    private static final float VIEWPORT_WIDTH = 15;
    private OrthographicCamera camera;
    private float w;
    private float h;
    //
    private World world;
    //Ball
    private Sprite[] ballSprites;
    private Texture ballTexture;
    private int MAX_BALLS;
    private Body[] ballModels;
    private static final float BALL_RADIUS = 0.15f;
    //Ground :: 
    private Sprite groundSprite;
    private Texture groundTexture;
    // Render general
    private SpriteBatch batch;

    @Override
    public void create() {
        w = Gdx.graphics.getWidth();
        h = Gdx.graphics.getHeight();
        //
        world = new World(new Vector2(0, -10), true);
        batch = new SpriteBatch();

        //
        camera = new OrthographicCamera(VIEWPORT_WIDTH, VIEWPORT_WIDTH * h / w);
        camera.position.set(0, camera.viewportHeight / 2, 0);
        camera.update();

        createSprites();
        createBalls();
        createGround();

    }

    private void createSprites() {
        ballTexture = new Texture(Gdx.files.internal("imagens/ball.png"));
        ballTexture.setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear);

        ballSprites = new Sprite[MAX_BALLS];
        for (int i = 0; i < MAX_BALLS; i++) {
            ballSprites[i] = new Sprite(ballTexture);
            ballSprites[i].setSize(BALL_RADIUS * 2, BALL_RADIUS * 2);
            ballSprites[i].setOrigin(BALL_RADIUS, BALL_RADIUS);
        }

        groundTexture = new Texture(Gdx.files.internal("imagens/white.png"));

        groundSprite = new Sprite(groundTexture);
        groundSprite.setSize(VIEWPORT_WIDTH, 1);
        groundSprite.setPosition(-VIEWPORT_WIDTH / 2, 0);
        groundSprite.setColor(Color.GREEN);

    }

    private void createBalls() {
        BodyDef ballBodyDef = new BodyDef();
        ballBodyDef.type = BodyDef.BodyType.DynamicBody;

        CircleShape shape = new CircleShape();
        shape.setRadius(BALL_RADIUS);

        FixtureDef fd = new FixtureDef();
        fd.density = 1;
        fd.friction = 0.5f;
        fd.restitution = 0.5f;
        fd.shape = shape;

        ballModels = new Body[MAX_BALLS];
        for (int i = 0; i < MAX_BALLS; i++) {
            ballModels[i] = world.createBody(ballBodyDef);
            ballModels[i].createFixture(fd);
           
        }

        shape.dispose();
    }

    private void createGround() {
        BodyDef bd = new BodyDef();
        bd.position.set(0, 0);
        bd.type = BodyDef.BodyType.StaticBody;

        PolygonShape shape = new PolygonShape();
        shape.setAsBox(VIEWPORT_WIDTH, 1);

        FixtureDef fd = new FixtureDef();
        fd.density = 1;
        fd.friction = 0.5f;
        fd.restitution = 0.5f;
        fd.shape = shape;

        world.createBody(bd).createFixture(fd);

        shape.dispose();
    }

    @Override
    public void render() {
        GL10 gl = Gdx.gl10;
        gl.glClearColor(1, 1, 1, 1);
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

        w = Gdx.graphics.getWidth();
        h = Gdx.graphics.getHeight();

        world.step(1 / 60f, 10, 10);

        for (int i = 0; i < MAX_BALLS; i++) {
            Vector2 ballPos = ballModels[i].getPosition();
            ballSprites[i].setPosition(ballPos.x - ballSprites[i].getWidth() / 2, ballPos.y - ballSprites[i].getHeight() / 2);
            ballSprites[i].setRotation(ballModels[i].getAngle() * MathUtils.radiansToDegrees);
        }

        batch.setProjectionMatrix(camera.combined);
        batch.begin();
        groundSprite.draw(batch);
        for (int i = 0; i < MAX_BALLS; i++) {
            ballSprites[i].draw(batch);
        }
        batch.flush();
        batch.end();


    }

    @Override
    public void resize(int width, int height) {
    }

    @Override
    public void pause() {
    }

    @Override
    public void resume() {
    }

    @Override
    public void dispose() {
    }
}

[Andre_Lopes]

Fixed, max_balls was == 0

now it does draw the ball, BUT, the balls just goes down and up. They collide but they dont move right, left.
Actually, they fall together, like they are glued.

package grassproject;

import aurelienribon.tweenengine.TweenManager;
import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.CircleShape;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.PolygonShape;
import com.badlogic.gdx.physics.box2d.World;
import java.util.Random;

/**
 *
 * @author André Vinícius Lopes
 */
public class App extends ApplicationAdapter {

    private static final float VIEWPORT_WIDTH = 10;
    private OrthographicCamera camera;
    private float w;
    private float h;
    //
    private World world;
    //Ball
    private Sprite[] ballSprites;
    private Texture ballTexture;
    private int MAX_BALLS = 2;
    private Body[] ballModels;
    private static final float BALL_RADIUS = 0.15f;
    //Ground :: 
    private Sprite groundSprite;
    private Texture groundTexture;
    // Render general
    private SpriteBatch batch;
    private final Random rand = new Random();

    @Override
    public void create() {
        w = Gdx.graphics.getWidth();
        h = Gdx.graphics.getHeight();
        //
        world = new World(new Vector2(0, -10), true);
        batch = new SpriteBatch();

        //
        camera = new OrthographicCamera(VIEWPORT_WIDTH, VIEWPORT_WIDTH * h / w);
        camera.position.set(0, camera.viewportHeight / 2, 0);
        camera.update();

        createSprites();
        createBalls();
        createGround();

    }

    private void createSprites() {
        ballTexture = new Texture(Gdx.files.internal("imagens/ball.png"));
        ballTexture.setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear);

        ballSprites = new Sprite[MAX_BALLS];
        for (int i = 0; i < MAX_BALLS; i++) {
            ballSprites[i] = new Sprite(ballTexture);
            ballSprites[i].setSize(BALL_RADIUS * 2, BALL_RADIUS * 2);
            ballSprites[i].setOrigin(BALL_RADIUS, BALL_RADIUS);
        }

        groundTexture = new Texture(Gdx.files.internal("imagens/white.png"));

        groundSprite = new Sprite(groundTexture);
        groundSprite.setSize(VIEWPORT_WIDTH, 1);
        groundSprite.setPosition(-VIEWPORT_WIDTH / 2, 0);
        groundSprite.setColor(Color.GREEN);

    }

    private void createBalls() {
        BodyDef ballBodyDef = new BodyDef();
        ballBodyDef.type = BodyDef.BodyType.DynamicBody;
        //ballBodyDef.position.x = w - 20;
        //ballBodyDef.position.y = 15;

        CircleShape shape = new CircleShape();
        shape.setRadius(BALL_RADIUS);

        FixtureDef fd = new FixtureDef();
        fd.density = 1;
        fd.friction = 0.5f;
        fd.restitution = 0.5f;
        fd.shape = shape;

        ballModels = new Body[MAX_BALLS];

        Vector2 vec = new Vector2();

        for (int i = 0; i < MAX_BALLS; i++) {
            ballModels[i] = world.createBody(ballBodyDef);
            ballModels[i].createFixture(fd);
            float tx = rand.nextFloat() * 1.0f - 0.5f;
            float ty = camera.position.y + camera.viewportHeight / 2 + BALL_RADIUS;
            float angle = rand.nextFloat() * MathUtils.PI * 2;
            ballModels[i].setLinearVelocity(vec.set(0, 0));
            ballModels[i].setAngularVelocity(0);
            ballModels[i].setTransform(vec.set(tx, ty), angle);

        }



        shape.dispose();
    }

    private void createGround() {
        BodyDef bd = new BodyDef();
        bd.position.set(0, 0);
        bd.type = BodyDef.BodyType.StaticBody;

        PolygonShape shape = new PolygonShape();
        shape.setAsBox(VIEWPORT_WIDTH, 1);

        FixtureDef fd = new FixtureDef();
        fd.density = 1;
        fd.friction = 0.5f;
        fd.restitution = 0.5f;
        fd.shape = shape;

        world.createBody(bd).createFixture(fd);

        shape.dispose();
    }

    @Override
    public void render() {
        GL10 gl = Gdx.gl10;
        gl.glClearColor(1, 1, 1, 1);
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

        w = Gdx.graphics.getWidth();
        h = Gdx.graphics.getHeight();

        world.step(1 / 60f, 10, 10);

        for (int i = 0; i < MAX_BALLS; i++) {
            Vector2 ballPos = ballModels[i].getPosition();
            ballSprites[i].setPosition(ballPos.x - ballSprites[i].getWidth() / 2, ballPos.y - ballSprites[i].getHeight() / 2);
            ballSprites[i].setRotation(ballModels[i].getAngle() * MathUtils.radiansToDegrees);
            System.out.println(ballPos.x + " ; " + ballPos.y);
        }

        batch.setProjectionMatrix(camera.combined);
        batch.begin();
        groundSprite.draw(batch);
        for (int i = 0; i < MAX_BALLS; i++) {
            ballSprites[i].draw(batch);
        }
        batch.flush();
        batch.end();


    }

    @Override
    public void resize(int width, int height) {
    }

    @Override
    public void pause() {
    }

    @Override
    public void resume() {
    }

    @Override
    public void dispose() {
    }
}

[Andre_Lopes]

Fixed…

ballModels[i].setBullet(true);
             ballModels[i].setActive(true);

Hm. Was kinda lucky