Input handler.java

    public boolean keyUp(int keycode) {
        if ((keycode == Input.Keys.RIGHT || keycode == Input.Keys.LEFT) && player.currentAction == null) {
            //Gdx.app.log("lkey up","");
            player.currentState = Sarah.State.STANDING;
              player.b2body.setLinearVelocity(0f, 0f);

        }
        return false;
    }


---------------------


        if (!Gdx.input.isKeyPressed(Input.Keys.UP)
                && !Gdx.input.isKeyPressed(Input.Keys.LEFT)
                && !Gdx.input.isKeyPressed(Input.Keys.RIGHT)
                && player.currentAction == null
                && player.currentState != Sarah.State.JUMPING
                && player.currentState != Sarah.State.FALLING
                && player.currentState != Sarah.State.STANDING
                && player.currentState != Sarah.State.RUNNING
                )
        {
            player.b2body.setLinearVelocity(0f, 0f);

        }