code: public void enter(boolean withAnimation) {
          if (GestureDebug.isDebugAnimator()) {
              Log.d(TAG, "Entering from none position, with animation = " + withAnimation);
          }
  
          enterInternal(withAnimation);
          updateInternal();
      }
docs: Starts 'enter' animation from no specific position (position will be calculated based on
  gravity set in {@link Settings}).
  <p>
  <b>Note, that in most cases you should use {@link #enter(View, boolean)} or
  {@link #enter(ViewPosition, boolean)} methods instead.</b>
  
  @param withAnimation Whether to animate entering or immediately jump to entered state