How to move Sprite forward and backward every time the button is click in libgdx?

How can I make my player move forward and backward in my top down game.I created two buttons the moveForward button and moveBackward button.Using acceleromter I move my player left and right. My main problem is the moving forward and backward of my player every time I click the buttons.It works using key up and down but I don't know how to implement using button touch.

Here is what I've coded below

// Load the sprite sheet as a texture
    cat = new Texture(Gdx.files.internal("spriteCatsheet.png"));
    catsprite = new Sprite(cat);
    catsprite.setScale(2f);
    player = new Rectangle();
    player.x = Gdx.graphics.getWidth() - player.width - 350; 
    player.y = catPlayerY;
    player.setWidth(25);

My Buttons

    //left_control
    left_paw = new Texture(Gdx.files.internal("left_paw.png"));
    myTextureRegion = new TextureRegion(left_paw);
    myTexRegionDrawable = new TextureRegionDrawable(myTextureRegion);
    moveBackward = new ImageButton(myTexRegionDrawable); //Set the button up
    moveBackward.getStyle().imageUp = new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("left_paw.png"))));
    //the hover
    moveBackward.getStyle().imageDown = new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("left_paw_hover.png"))));
    moveBackward.setPosition(10,25);
    stage.addActor(moveBackward); //Add the button to the stage to perform rendering and take input.
    Gdx.input.setInputProcessor(stage);
    moveBackward.addListener(new InputListener(){
        @Override
        public void touchUp (InputEvent event, float x, float y, int pointer, int button) {
            System.out.println("Left Button Pressed");
           //Move player Backward
           //player.y -= 300 * Gdx.graphics.getDeltaTime();
        }
        @Override
        public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
            System.out.print("Released");

            return true;
        }
    });
    stage.addActor(moveBackward);

    //right_control
    right_paw = new Texture(Gdx.files.internal("right_paw.png"));
    myTextureRegion = new TextureRegion(right_paw);
    myTexRegionDrawable = new TextureRegionDrawable(myTextureRegion);
    moveForward = new ImageButton(myTexRegionDrawable); //Set the button up
    moveForward.getStyle().imageUp = new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("right_paw.png"))));
    //the hover
    moveForward.getStyle().imageDown = new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("right_paw-hover.png"))));
    moveForward.setPosition(517,25);
    stage.addActor(moveForward); //Add the button to the stage to perform rendering and take input.
    Gdx.input.setInputProcessor(stage);
    moveForward.addListener(new InputListener(){
        @Override
        public void touchUp (InputEvent event, float x, float y, int pointer, int button) {
            System.out.println("Right Button Pressed");
             //Move player Forward
             //player.y += 300 * Gdx.graphics.getDeltaTime();

        }
        @Override
        public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
            return true;
        }
    });
    stage.addActor(moveForward);

Render

    spriteBatch.draw(currentFrame,player.x, player.y);

     //On keyboard 
    if(Gdx.input.isKeyPressed(Input.Keys.DOWN))player.y -= 300 * Gdx.graphics.getDeltaTime();
    if(Gdx.input.isKeyPressed(Input.Keys.UP)) player.y += 300 * Gdx.graphics.getDeltaTime();
    if(Gdx.input.isKeyPressed(Input.Keys.LEFT)) player.x -= 300 * Gdx.graphics.getDeltaTime();
    if(Gdx.input.isKeyPressed(Input.Keys.RIGHT)) player.x  += 300 * Gdx.graphics.getDeltaTime();

    //Mobile acceleration
    if (Gdx.input.isPeripheralAvailable(Input.Peripheral.Accelerometer)) {
        player.x -= Gdx.input.getAccelerometerX();
        player.y += Gdx.input.getAccelerometerY() /1f;
    }
    if (player.x < 0) {
        player.x = 0;
        player.x += Gdx.graphics.getDeltaTime() *20 *delta;
    }
    if (player.x > Gdx.graphics.getWidth()-player.getWidth() -150) {
        player.x = Gdx.graphics.getWidth()-player.getWidth() -150;
    }

Thank's and Advance ^_^

You can use in this way :

MotionState motionState=MotionState.NONE;

enum MotionState {

    NONE {
        @Override
        public boolean update(Rectangle player) {
           return true;
        }
    },

    UP {
        @Override
        public boolean update(Rectangle player) {
            player.y += 300 * Gdx.graphics.getDeltaTime();
            return false;
        }
    },

    DOWN{
        @Override
        public boolean update(Rectangle player) {
            player.y -= 300 * Gdx.graphics.getDeltaTime();
            return false;
        }
    },

    LEFT{
        @Override
        public boolean update(Rectangle player)  {
            player.x -= 300 * Gdx.graphics.getDeltaTime();
            return false;
        }
    },

    RIGHT{
        @Override
        public boolean update(Rectangle player) {
            player.x  += 300 * Gdx.graphics.getDeltaTime();
            return false;
        }
    };

    public abstract boolean update(Rectangle player);
}

Inside your render() method

if(Gdx.input.isKeyPressed(Input.Keys.DOWN)) motionState = MotionState.DOWN;
if(Gdx.input.isKeyPressed(Input.Keys.UP)) motionState=MotionState.UP;
if(Gdx.input.isKeyPressed(Input.Keys.LEFT)) motionState=MotionState.LEFT;
if(Gdx.input.isKeyPressed(Input.Keys.RIGHT)) motionState=MotionState.RIGHT;

if(motionState.update(player)) motionState=MotionState.NONE;

Now inside Button's Listener method

moveBackward.addListener(new InputListener(){
    @Override
    public void touchUp (InputEvent event, float x, float y, int pointer, int button) {
       motionState=MotionState.NONE;
    }
    @Override
    public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
         motionState=MotionState.DOWN;  // or what you want 
        return true;
    }
});

Do for moveForward button.