title: lbgdx - Particle Effect is not rendering
body: <p>I have a problem attaching a Particle Effect, made by the particle editor, in my android code. It is just not rendered in runtime, even if the duration of the effect should be around 3 sec and it is positioned on the center of the screen. 
  As I can see some few other users faced with this kind of problem before but every answer they got didn't help me.
  Here is my code:</p>
  
  <pre class="lang-java prettyprint-override"><code>// in creating 
  effect = new ParticleEffect();
      effect.load(Gdx.files.internal("effects/prova2.p"), Gdx.files.internal("effects"));
      effect.setPosition(Gdx.graphics.getWidth()/2, Gdx.graphics.getHeight()/2);
      effect.start();
  
  //in rendering
      effect.draw(game.batch, delta);
  </code></pre>
  
  <p>Also I tried to change "delta" with my world step value (1/40f) or calling Gdx.graphics.getDelta() but that doesn't seem to be the problem.</p>