如何检查是否仍连接到由 setProcessDefaultNetwork() 设置的网络

Question

我有以下代码设置我的互联网连接的默认网络。

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
    NetworkRequest.Builder builder = new NetworkRequest.Builder();
    builder.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
    builder.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR);
    NetworkCallback networkCallback = new NetworkCallback() {
        @Override
        public void onAvailable(Network network) {
            boolean result = ConnectivityManager.setProcessDefaultNetwork(network);
            Log.d(TAG, "success? " + result);
        }
    };
    NetworkRequest networkRequest = builder.build();
    connMgr.requestNetwork(networkRequest, networkCallback);
    connMgr.registerNetworkCallback(networkRequest, networkCallback);
}

这工作正常。但是，稍后，当我使用以下代码进行检查时：

ConnectivityManager connMgr = (ConnectivityManager)
    context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfoMobile =
    connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

networkInfoMobile.isConnected();  // returns false!

这总是returnsfalse。我做错了什么？

Answer 1

我所做的是保存 onAvailable() 回调提供的 network。后来，我通过以下方式检查了连接：

NetworkInfo networkInfo = connMgr.getNetworkInfo(networkFromOnAvailable);
networkInfo.isConnected();

干杯！

如何检查是否仍连接到由 setProcessDefaultNetwork() 设置的网络

How to check if still connected to the network set by setProcessDefaultNetwork()

android

android-5.1.1-lollipop