title: Android - tween animation to use with OpenGL
body: <p>I need to animate some objects on my GLSurfaceView by changing their properties - size, position, rotation angle etc.
  I want to use interpolators to change rate of my animation (accelerate/decelerate) and I also need to know when it ends (onAnimationEnd listener).</p>
  
  <p>android.animation.Animator class is perfect for this job, but unfortunately it requires API 11 and I'm developing for API 7.</p>
  
  <p>Is there any other class that I can use? Maybe third-party, but light and optimized for Android.</p>