public static synchronized void close() {
    if (sModule != null) {
      sModule.close();
      sModule = null;
    }
  }
Closes any resources and objects held by this injector. To use the injector again, invoke
{@link #resetForIntegrationTesting(Context)}.
java/com/google/android/apps/authenticator/testability/DependencyInjector.java