2d animation libgdx is not working

Question

My animation is not working, only a static picture is displayed. I did everything according to the example from libgdx/wiki. Why does not it work?

public class Thorns  extends GameObject implements IGameObject  {

    Animation<TextureRegion> animation;
    private static final int FRAME_COLS = 1, FRAME_ROWS = 2;
    public Thorns(Texture texture, Body body) {
        super(texture, body,false);
        Texture walkSheet = new Texture("Thorns.png");
        TextureRegion[][] tmp = TextureRegion.split(walkSheet,
            walkSheet.getWidth() / FRAME_COLS,
            walkSheet.getHeight() / FRAME_ROWS);

        TextureRegion[] walkFrames = new TextureRegion[FRAME_ROWS*FRAME_COLS];
        int index = 0;
        for (int i = 0; i < FRAME_ROWS; i++) {
            for (int j = 0; j < FRAME_COLS; j++) {
                walkFrames[index++] = tmp[i][j];
            }
        }

        animation = new Animation<TextureRegion>(1.025f, walkFrames);
    }

    @Override
    public void dispose() {

    }

    int stateTime;

    @Override
    public void draw(SpriteBatch spriteBatch) {
        stateTime += Gdx.graphics.getDeltaTime();

        TextureRegion currentFrame = (TextureRegion) animation.getKeyFrame(stateTime, false);

        spriteBatch.draw(currentFrame, body.getTransform().getPosition().x, body.getTransform().getPosition().y);
        //drawSprite(spriteBatch);

    }
}

Animation does not start at all

Answer 1

Quite possible animation is running but you're not getting his view, because you've two frame animation with frame duration 1.025 sec. And your Animation is running without loop.

Try looped Aniamation so pass true as in second parameter of getKeyFrame (float stateTime, boolean looping) method.

@Override
public void draw(SpriteBatch spriteBatch) {
    stateTime += Gdx.graphics.getDeltaTime();
    TextureRegion currentFrame =  animation.getKeyFrame(stateTime, true);
    spriteBatch.draw(currentFrame, body.getTransform().getPosition().x, body.getTransform().getPosition().y);
}

EDIT

Change data type of stateTime to float from int.