code: public static synchronized void removeChannel(String channelId) {
          try {
              if (_removeChannel(channelId)) {
                  save();
              }
          } catch (Exception ex) {
              Log.e(WonderPush.TAG, "Unexpected error while removing channel " + channelId, ex);
          }
      }
docs: Remove a channel.
  
  <p>Remove a channel both from this class registry and from Android.</p>
  
  @param channelId The identifier of the channel to remove.