title: AnimatorSet: Circular dependencies cannot exist
body: <p>When i click on start button, then end button and again clicking on start button results in following exception:</p>
  
  <pre><code>10-08 08:57:57.963: E/AndroidRuntime(2009): java.lang.IllegalStateException: Circular dependencies cannot exist in AnimatorSet
  10-08 08:57:57.963: E/AndroidRuntime(2009):     at android.animation.AnimatorSet.sortNodes(AnimatorSet.java:848)
  10-08 08:57:57.963: E/AndroidRuntime(2009):     at android.animation.AnimatorSet.start(AnimatorSet.java:486)
  10-08 08:57:57.963: E/AndroidRuntime(2009):     at com.example.propertyanimation.IndividualPropertyAnimationActivity$1.onClick(IndividualPropertyAnimationActivity.java:51)
  10-08 08:57:57.963: E/AndroidRuntime(2009):     at android.view.View.performClick(View.java:4240)
  </code></pre>
  
  <p>Source code:</p>
  
  <pre><code>    pvhX = PropertyValuesHolder.ofFloat(View.SCALE_X, 2);
      pvhY = PropertyValuesHolder.ofFloat(View.SCALE_Y, 2);
      scaleAnimation = ObjectAnimator.ofPropertyValuesHolder(mSubject, pvhX, pvhY);
      scaleAnimation.setRepeatCount(0);
      scaleAnimation.setRepeatMode(ValueAnimator.REVERSE);
      scaleAnimation.setDuration(3000);
  
      rotateAnimation = ObjectAnimator.ofFloat(mSubject, View.ROTATION, 360);
      rotateAnimation.setRepeatCount(ValueAnimator.INFINITE);
      rotateAnimation.setDuration(2000);
  
      mButtonStart.setOnClickListener(new View.OnClickListener() {
  
          @Override
          public void onClick(View v) {
              setAniation.play(scaleAnimation).before(rotateAnimation);
              setAniation.start();
          }
      });
      mButtonEnd.setOnClickListener(new View.OnClickListener() {
  
          @Override
          public void onClick(View v) {
              setAniation.end();
          }
      });
  </code></pre>