应用离线时Firebase持续报错，请求协助排查解决

应用离线时，Firebase Firestore持续抛出无法捕获的错误，恢复在线后错误停止。当前通过监听器监听Firestore集合与文档，错误日志如下：

V/NativeCrypto(26596): Read error: ssl=0xb4000074b15e4318: I/O error during system call, Software caused connection abort
V/NativeCrypto(26596): Write error: ssl=0xb4000074b15e4318: I/O error during system call, Broken pipe
W/ManagedChannelImpl(26596): [{0}] Failed to resolve name. status={1}
D/TrafficStats(26596): tagSocket(3) with statsTag=0xffffffff, statsUid=-1
W/ManagedChannelImpl(26596): [{0}] Failed to resolve name. status={1}
W/Firestore(26596): (24.9.1) [WatchStream]: (9f3395b) Stream closed with status: Status{code=UNAVAILABLE, description=End of stream or IOException, cause=null}.
V/NativeCrypto(26596): SSL shutdown failed: ssl=0xb4000074b15e4318: I/O error during system call, Success
W/Firestore(26596): (24.9.1) [WatchStream]: (9f3395b) Stream closed with status: Status{code=UNAVAILABLE, description=Unable to resolve host firestore.googleapis.com, cause=java.lang.RuntimeException: java.net.UnknownHostException: Unable to resolve host "firestore.googleapis.com": No address associated with hostname
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver.resolveAddresses(DnsNameResolver.java:223)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver.doResolve(DnsNameResolver.java:282)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver$Resolve.run(DnsNameResolver.java:318)
W/Firestore(26596):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
W/Firestore(26596):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
W/Firestore(26596):     at java.lang.Thread.run(Thread.java:1012)
W/Firestore(26596): Caused by: java.net.UnknownHostException: Unable to resolve host "firestore.googleapis.com": No address associated with hostname
W/Firestore(26596):     at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:124)
W/Firestore(26596):     at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:103)
W/Firestore(26596):     at java.net.InetAddress.getAllByName(InetAddress.java:1152)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver$JdkAddressResolver.resolveAddress(DnsNameResolver.java:631)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver.resolveAddresses(DnsNameResolver.java:219)
W/Firestore(26596):     ... 5 more
W/Firestore(26596): }.

该错误会重复出现，重复日志如下：

W/ManagedChannelImpl(26596): [{0}] Failed to resolve name. status={1}
W/Firestore(26596): (24.9.1) [WatchStream]: (9f3395b) Stream closed with status: Status{code=UNAVAILABLE, description=Unable to resolve host firestore.googleapis.com, cause=java.lang.RuntimeException: java.net.UnknownHostException: Unable to resolve host "firestore.googleapis.com": No address associated with hostname
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver.resolveAddresses(DnsNameResolver.java:223)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver.doResolve(DnsNameResolver.java:282)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver$Resolve.run(DnsNameResolver.java:318)
W/Firestore(26596):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
W/Firestore(26596):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
W/Firestore(26596):     at java.lang.Thread.run(Thread.java:1012)
W/Firestore(26596): Caused by: java.net.UnknownHostException: Unable to resolve host "firestore.googleapis.com": No address associated with hostname
W/Firestore(26596):     at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:124)
W/Firestore(26596):     at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:103)
W/Firestore(26596):     at java.net.InetAddress.getAllByName(InetAddress.java:1152)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver$JdkAddressResolver.resolveAddress(DnsNameResolver.java:631)
W/Firestore(26596):     at io.grpc.internal.DnsNameResolver.resolveAddresses(DnsNameResolver.java:219)
W/Firestore(26596):     ... 5 more
W/Firestore(26596): }.

• 监听网络状态，动态启停Firestore监听器
  注册Android网络广播接收器或使用ConnectivityManager.NetworkCallback监听网络状态变化。当检测到设备离线时，主动移除Firestore的集合/文档监听器；恢复在线时，重新注册监听器。示例代码：

  // 保存监听器引用
  ListenerRegistration registration = db.collection("your-collection").addSnapshotListener(...);
  
  // 离线时移除监听器
  if (isOffline()) {
      registration.remove();
  }
  
  // 在线时重新添加监听器
  if (isOnline()) {
      registration = db.collection("your-collection").addSnapshotListener(...);
  }
  

• 确保Firestore离线持久化已启用
  开启离线持久化后，SDK会优先使用本地缓存，减少离线状态下的无效网络请求。初始化Firestore时添加配置：

  FirebaseFirestoreSettings settings = new FirebaseFirestoreSettings.Builder()
          .setPersistenceEnabled(true)
          .build();
  FirebaseFirestore.getInstance().setFirestoreSettings(settings);
  

• 过滤冗余日志输出
  如果只是不想看到这些错误日志（不影响功能），可以在Android Studio的Logcat中过滤掉ManagedChannelImpl和Firestore的WARN级别日志，或者在proguard-rules.pro中添加规则抑制相关日志。

• 升级Firebase SDK版本
  当前使用的Firestore版本为24.9.1，尝试升级到最新稳定版，新版本可能修复了离线状态下的日志重复抛出问题。

内容的提问来源于stack exchange，提问作者Olumide