code: public synchronized void resume() {
          if (!paused) {
              Util.w(TAG, "require resume this queue(remain " + taskList.size() + "), but it is"
                      + " still running");
              return;
          }
          paused = false;
  
          if (!taskList.isEmpty() && !looping) {
              looping = true;
              startNewLooper();
          }
      }
docs: Resume the queue if the queue is paused.
  
  @see #pause()