code: public void resume() {
          if (hasState(PAUSED)) {
              if (DBG) Log.v(TAG, "resume.");
              clearState(PAUSED);
  
              if (mContentView.isShown()) {
                  schedule(MSG_SHOW, mNotiDisplayTime);
                  return;
              }
  
              if (!mEntries.isEmpty()) {
                  addState(TICKING);
                  schedule(MSG_START, mNotiDisplayTime);
              }
          }
      }
docs: Resume.