Gists for https://medium.com/@josiassena/graphql-websocket-subscriptions-on-android-using-apollo-7e7311afdfca

ApolloSubscriptionClientFactory.kt

class ApolloSubscriptionClientFactory {
    
  fun createSubscriptionApolloClient(sharedOkHttpClientBuilder: OkHttpClient.Builder): ApolloClient {
      val okHttpClient = sharedOkHttpClientBuilder
            .pingInterval(KEEP_ALIVE_INTERVAL, TimeUnit.SECONDS)
            .build()
    
      val subscriptionTransportFactory = WebSocketSubscriptionTransport.Factory("wss://your_subscription_host/graphql", okHttpClient)
    
      return ApolloClient.builder()
          .serverUrl("https://your_host_url/graphql")
          .okHttpClient(okHttpClient)
          .subscriptionConnectionParams(HeadersProvider.HEADERS)
          .subscriptionTransportFactory(subscriptionTransportFactory)
          .build()
    }

    // ...
}