code: public void addWatcher(int id, TextWatcher watcher, boolean enabled){
          mWatchers.put(id, watcher);
          mEnabledKeys.put(id, enabled);
      }
docs: Add a {@link TextWatcher} with a specified Id and whether or not it is enabled by default
  
  @param id            the id of the {@link TextWatcher} to add
  @param watcher       the {@link TextWatcher} to add
  @param enabled       whether or not it is enabled by default