Firebase存储无internet连接回调[关闭]

Question

当应用程序开始时，我正在从Firebase存储加载一些数据，我正在设置'on成功监听器'和'onFailureListener'以在加载完成时隐藏进度条。问题是：当我离线尝试应用程序时，我根本没有收到回调。我尝试了onCompleteListener，但它也没有被调用它在控制台中给我提供了以下消息：

W/ManagedChannelImpl: [{0}] Failed to resolve name. status={1}
W/Firestore: (21.4.1) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Connection failed 1 times. Most recent error: 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
        at io.grpc.internal.DnsNameResolver.resolveAll(DnsNameResolver.java:420)
        at io.grpc.internal.DnsNameResolver$Resolve.resolveInternal(DnsNameResolver.java:256)
        at io.grpc.internal.DnsNameResolver$Resolve.run(DnsNameResolver.java:213)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
     Caused by: java.net.UnknownHostException: Unable to resolve host "firestore.googleapis.com": No address associated with hostname
        at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:157)
        at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:105)
        at java.net.InetAddress.getAllByName(InetAddress.java:1154)
        at io.grpc.internal.DnsNameResolver$JdkAddressResolver.resolveAddress(DnsNameResolver.java:640)
        at io.grpc.internal.DnsNameResolver.resolveAll(DnsNameResolver.java:388)
        at io.grpc.internal.DnsNameResolver$Resolve.resolveInternal(DnsNameResolver.java:256) 
        at io.grpc.internal.DnsNameResolver$Resolve.run(DnsNameResolver.java:213) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:764) 
     Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
        at libcore.io.Linux.android_getaddrinfo(Native Method)
        at libcore.io.BlockGuardOs.android_getaddrinfo(BlockGuardOs.java:172)
        at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:137)
        at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:105) 
        at java.net.InetAddress.getAllByName(InetAddress.java:1154) 
        at io.grpc.internal.DnsNameResolver$JdkAddressResolver.resolveAddress(DnsNameResolver.java:640) 
        at io.grpc.internal.DnsNameResolver.resolveAll(DnsNameResolver.java:388) 
        at io.grpc.internal.DnsNameResolver$Resolve.resolveInternal(DnsNameResolver.java:256) 
        at io.grpc.internal.DnsNameResolver$Resolve.run(DnsNameResolver.java:213) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:764) 
    }
    This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.

然后，只要应用程序正在运行，就会显示以下消息：

W/ExponenentialBackoff: network unavailable, sleeping.
W/ExponenentialBackoff: network unavailable, sleeping.
W/ExponenentialBackoff: network unavailable, sleeping.
W/ExponenentialBackoff: network unavailable, sleeping.
W/ExponenentialBackoff: network unavailable, sleeping.
W/ExponenentialBackoff: network unavailable, sleeping.
W/ExponenentialBackoff: network unavailable, sleeping.
.
.
.

等待了这么长时间后，它最终给出一个错误并触发“失败侦听器”：

E/StorageException: StorageException has occurred.
    The operation retry limit has been exceeded.
     Code: -13030 HttpResult: -2
E/StorageException: Could not open resulting stream.
    java.io.IOException: Could not open resulting stream.
        at com.google.firebase.storage.StreamDownloadTask.createDownloadStream(com.google.firebase:firebase-storage@@19.1.1:145)
        at com.google.firebase.storage.StreamDownloadTask.access$000(com.google.firebase:firebase-storage@@19.1.1:36)
        at com.google.firebase.storage.StreamDownloadTask$1.call(com.google.firebase:firebase-storage@@19.1.1:167)
        at com.google.firebase.storage.StreamDownloadTask$1.call(com.google.firebase:firebase-storage@@19.1.1:164)
        at com.google.firebase.storage.StreamDownloadTask$StreamProgressWrapper.ensureStream(com.google.firebase:firebase-storage@@19.1.1:325)
        at com.google.firebase.storage.StreamDownloadTask$StreamProgressWrapper.access$100(com.google.firebase:firebase-storage@@19.1.1:262)
        at com.google.firebase.storage.StreamDownloadTask.run(com.google.firebase:firebase-storage@@19.1.1:175)
        at com.google.firebase.storage.StorageTask.lambda$getRunnable$7(com.google.firebase:firebase-storage@@19.1.1:1072)
        at com.google.firebase.storage.StorageTask$$Lambda$12.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
E/StorageException: StorageException has occurred.
    The operation retry limit has been exceeded.
     Code: -13030 HttpResult: -2
E/StorageException: Could not open resulting stream.
    java.io.IOException: Could not open resulting stream.
        at com.google.firebase.storage.StreamDownloadTask.createDownloadStream(com.google.firebase:firebase-storage@@19.1.1:145)
        at com.google.firebase.storage.StreamDownloadTask.access$000(com.google.firebase:firebase-storage@@19.1.1:36)
        at com.google.firebase.storage.StreamDownloadTask$1.call(com.google.firebase:firebase-storage@@19.1.1:167)
        at com.google.firebase.storage.StreamDownloadTask$1.call(com.google.firebase:firebase-storage@@19.1.1:164)
        at com.google.firebase.storage.StreamDownloadTask$StreamProgressWrapper.ensureStream(com.google.firebase:firebase-storage@@19.1.1:325)
        at com.google.firebase.storage.StreamDownloadTask$StreamProgressWrapper.access$100(com.google.firebase:firebase-storage@@19.1.1:262)
        at com.google.firebase.storage.StreamDownloadTask.run(com.google.firebase:firebase-storage@@19.1.1:175)
        at com.google.firebase.storage.StorageTask.lambda$getRunnable$7(com.google.firebase:firebase-storage@@19.1.1:1072)
        at com.google.firebase.storage.StorageTask$$Lambda$12.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
W/Warning: Maybe internet or authentication issues
    com.google.firebase.storage.StorageException: The operation retry limit has been exceeded.
        at com.google.firebase.storage.StreamDownloadTask.snapStateImpl(com.google.firebase:firebase-storage@@19.1.1:229)
        at com.google.firebase.storage.StreamDownloadTask.snapStateImpl(com.google.firebase:firebase-storage@@19.1.1:35)
        at com.google.firebase.storage.StorageTask.snapState(com.google.firebase:firebase-storage@@19.1.1:343)
        at com.google.firebase.storage.TaskListenerImpl.onInternalStateChanged(com.google.firebase:firebase-storage@@19.1.1:85)
        at com.google.firebase.storage.StorageTask.tryChangeState(com.google.firebase:firebase-storage@@19.1.1:390)
        at com.google.firebase.storage.StorageTask.tryChangeState(com.google.firebase:firebase-storage@@19.1.1:426)
        at com.google.firebase.storage.StreamDownloadTask.run(com.google.firebase:firebase-storage@@19.1.1:201)
        at com.google.firebase.storage.StorageTask.lambda$getRunnable$7(com.google.firebase:firebase-storage@@19.1.1:1072)
        at com.google.firebase.storage.StorageTask$$Lambda$12.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
     Caused by: java.io.IOException: Could not open resulting stream.
        at com.google.firebase.storage.StreamDownloadTask.createDownloadStream(com.google.firebase:firebase-storage@@19.1.1:145)
        at com.google.firebase.storage.StreamDownloadTask.access$000(com.google.firebase:firebase-storage@@19.1.1:36)
        at com.google.firebase.storage.StreamDownloadTask$1.call(com.google.firebase:firebase-storage@@19.1.1:167)
        at com.google.firebase.storage.StreamDownloadTask$1.call(com.google.firebase:firebase-storage@@19.1.1:164)
        at com.google.firebase.storage.StreamDownloadTask$StreamProgressWrapper.ensureStream(com.google.firebase:firebase-storage@@19.1.1:325)
        at com.google.firebase.storage.StreamDownloadTask$StreamProgressWrapper.access$100(com.google.firebase:firebase-storage@@19.1.1:262)
        at com.google.firebase.storage.StreamDownloadTask.run(com.google.firebase:firebase-storage@@19.1.1:175)
        at com.google.firebase.storage.StorageTask.lambda$getRunnable$7(com.google.firebase:firebase-storage@@19.1.1:1072) 
        at com.google.firebase.storage.StorageTask$$Lambda$12.run(Unknown Source:2) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:764) 

当这种情况发生时，我希望尽快收到回电。

Answer 1

您确实收到了一个失败回调，但原因是错误\u重试\u限制\u超过了。FirebaseStorage似乎不检查是否已连接internet，但仍尝试启动任务。你不想在自己开始上传/下载任务之前检查一下是否有互联网连接吗？

    public static boolean isOnline() {
        Runtime runtime = Runtime.getRuntime();
        try {
            Process ipProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
            int     exitValue = ipProcess.waitFor();
            return (exitValue == 0);
        }
        catch (IOException | InterruptedException e) { e.printStackTrace(); }

        return false;
    }

编辑：

通常，您希望在重新加载数据时保持此功能。想象一下这样一种情况：用户有一个internet连接，但速度有点慢或不一致，FirebaseStorage将通过第二次或第三次尝试启动下载任务。

只有一个选项会影响Firebase storage重试机制，此处描述：如何缩短网络错误时Firebase storage下载重试时间
或者您可以按照我的建议，首先检查用户是否已连接internet，然后才开始任务：

void yourMethod(...) {
   if (!isOnline) {
       //hiding progress bar
       //and fallback, maybe Toast to inform the user about the issue with internet connection
       return;
   }
   // start your download task
}