使用自定义Pub/Sub密钥时PubNub WebRTC Android Demo提示“用户不在线”问题咨询

Hey there, let's troubleshoot that "user not online" error you're hitting after switching to your custom PubNub keys. I've dealt with similar WebRTC/PubNub integration issues before, so here are the most likely culprits and fixes to check:

1. Confirm Your Pub/Sub Key Pair is Correct #

First things first—double-check that you're using the exact Publish and Subscribe keys from your PubNub dashboard. It's super easy to mix them up or copy a wrong character. Also, make sure both keys belong to the same PubNub app instance; using keys from different apps will break cross-device communication entirely.

2. Check Access Manager Permissions #

Demo PubNub keys have wide-open permissions by default, but your custom keys might have restricted access via PubNub's Access Manager. Head to your dashboard and verify:

• The channels you're using for video chat have read (subscribe) and write (publish) permissions enabled for all users, or for the specific UUIDs your app generates.
• If you've enabled Access Manager, ensure your app is correctly fetching and passing a valid authentication token before subscribing/publishing. Missing or invalid tokens will block access, making other users appear offline.

3. Validate UUIDs and Channel Names #

• Each device needs a unique UUID to be identified by PubNub. If you're hardcoding a UUID or generating a duplicate one across devices, PubNub won't recognize them as separate users. Make sure your app generates a unique UUID per install (like using UUID.randomUUID().toString()).
• Confirm both devices are connecting to the exact same channel name—channel names are case-sensitive! A tiny typo (e.g., "VideoChat" vs "videochat") will prevent users from seeing each other.

4. Double-Check Your Initialization Code #

When swapping to custom keys, make sure you updated both the publish and subscribe keys in your PubNub initialization. For example, in your Android code:

PubNub pubnub = new PubNub.Builder()
  .subscribeKey("YOUR_CUSTOM_SUBSCRIBE_KEY")
  .publishKey("YOUR_CUSTOM_PUBLISH_KEY")
  .uuid(uniqueUserUuid)
  .build();

It's easy to miss a spot—check if you have any debug build variants or hardcoded demo keys still lingering in your codebase.

5. Enable Debug Logs to Dig Deeper #

Turn on PubNub's verbose logging to see exactly what's going wrong. In Android, you can enable this with:

PubNub.setLogVerbosity(PNLogVerbosity.BODY);

Look for logs about connection failures, permission denied errors, or failed subscribe attempts. If you see permission issues, that's a clear sign your Access Manager settings are off. If connections are failing, check if your network allows traffic to PubNub's servers (some corporate networks block standard HTTPS ports, though PubNub uses 443 which is usually open).

6. Rule Out Network/Firewall Restrictions #

Sometimes, even with correct keys, network restrictions can block PubNub traffic. Make sure your device isn't behind a firewall that blocks outgoing HTTPS requests, or that your app has the INTERNET permission in your AndroidManifest.xml:

<uses-permission android:name="android.permission.INTERNET" />

Work through these steps one by one—most of the time, the issue is a simple misconfiguration like a typo in keys, incorrect permissions, or duplicate UUIDs. Let me know if you hit any specific logs or errors during this process!

内容的提问来源于stack exchange，提问作者RDB