@Override public void onDraw(){
  if (mIsControllerAttached) {
    return;
  }
  FLog.wtf(DraweeEventTracker.class,"%x: Draw requested for a non-attached controller %x. %s",System.identityHashCode(this),System.identityHashCode(mController),toString());
  mIsHolderAttached=true;
  mIsVisible=true;
  mIsActivityStarted=true;
  attachOrDetachController();
}

@ Override public void onDraw ( ) { if ( mIsControllerAttached ) { return ; } FLog . wtf ( DraweeEventTracker . class , "%x: Draw requested for a non-attached controller %x. %s" , System . identityHashCode ( this ) , System . identityHashCode ( mController ) , toString ( ) ) ; mIsHolderAttached = true ; mIsVisible = true ; mIsActivityStarted = true ; attachOrDetachController ( ) ; }
callback used to notify about top - level - drawable being drawn .
