code: public static Rollbar init(Context context, ConfigProvider provider) {
      if (isInit()) {
        Log.w(TAG, "Rollbar.init() called when it was already initialized.");
      } else {
        notifier = new Rollbar(context, null, null, true, false, provider);
      }
      return notifier;
    }
docs: Initialize the singleton instance of Rollbar.
  
  @param context  Android context to use.
  @param provider a provider of the configuration.
  @return the managed instance of Rollbar.