多个随机NetworkCallbacks (onAvailable)与来自ConnectivityManager的相同networkId

Question

我不明白为什么在随机时刻多次调用onAvailable，文档指出，如果网络发生变化，可以更多地调用它，但是onAvailable中的网络对象参数的属性总是相同的。我甚至比较了这些哈希码，它们是一样的.

这个问题发生在我的LG棒棒糖装置上。

安卓文档：(https://developer.android.com/reference/android/net/ConnectivityManager.NetworkCallback)

onAvailable添加了APILevel21，在框架连接时调用了，并声明了一个可供使用的新网络。如果满足请求的网络发生更改，则可以多次调用此回调

编辑:我实现了回调中的其他方法，以检查是否触发了其他方法(onLosing、onUnavailable、onCapabilitiesChanged、onLinkPropertiesChanged)，但这些方法都没有被调用

我有自己的NetworkManager，其中包含以下代码：

public void initialize(Context context) {
    connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    setState();
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        final NetworkRequest networkRequest = new NetworkRequest.Builder()
                .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
                .addTransportType(NetworkCapabilities.TRANSPORT_WIFI).build();

        connectivityManager.registerNetworkCallback(networkRequest, new ConnectivityManager.NetworkCallback() {
            @Override
            public void onAvailable(final Network network) {
                super.onAvailable(network);
                NetworkInfo networkInfo = connectivityManager.getNetworkInfo(network);
                Log.d(TAG,"Network is Available. Network Info: " + networkInfo);
                notifyObservers();
            }

            @Override
            public void onLost(final Network network) {
                super.onLost(network);
                notifyObservers();
            }
        });
    } else {
        context.registerReceiver(new NetworkChangeReceiver(), new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    }
}

日志：

Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
...

Answer 1

我们在运行安卓5的斑马MC18设备上遇到了同样的问题。我们的解决办法是检查最后一次onAvailable呼叫是否来自同一个网络，同时我们没有收到这个网络的onLost。