code: @Override
    @Deprecated
    public boolean postAtFrontOfQueue(Runnable runnable) {
      if (!quit) {
        getScheduler().postAtFrontOfQueue(runnable);
        return true;
      } else {
        return false;
      }
    }
docs: Enqueue a task to be run ahead of all other delayed tasks.
  
  @param runnable    the task to be run
  @return true if the runnable is enqueued
  @see android.os.Handler#postAtFrontOfQueue(Runnable)
  @deprecated Use a {@link android.os.Handler} instance to post to a looper.