android.net.Network#getSocketFactory ( )源码实例Demo

private static SocketFactory getWifiSocketFactory(final Context context) {
    SocketFactory socketFactory = SocketFactory.getDefault();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && !isGalaxyDevice()) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        Network[] allNetwork = cm.getAllNetworks();
        for (Network network : allNetwork) {
            NetworkCapabilities networkCapabilities = cm.getNetworkCapabilities(network);
            if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                socketFactory = network.getSocketFactory();
            }
        }
    }
    return socketFactory;
}
 

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static Socket createWiFiSocket(Context context) {
    if(context == null){
        logInfo("Context supplied was null");
        return null;
    }
    PackageManager pm = context.getPackageManager();
    if (pm == null) {
        logInfo("PackageManager isn't available.");
        return null;
    }
    // getAllNetworks() and getNetworkCapabilities() require ACCESS_NETWORK_STATE
    if (pm.checkPermission(Manifest.permission.ACCESS_NETWORK_STATE, context.getPackageName()) != PackageManager.PERMISSION_GRANTED) {
        logInfo("Router service doesn't have ACCESS_NETWORK_STATE permission. It cannot bind a TCP transport to Wi-Fi network.");
        return null;
    }

    ConnectivityManager connMan = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connMan == null) {
        logInfo("ConnectivityManager isn't available.");
        return null;
    }

    Network[] allNetworks = connMan.getAllNetworks();
    if (allNetworks == null) {
        logInfo("Failed to acquire a list of networks.");
        return null;
    }

    // Samsung Galaxy S9 (with Android 8.0.0) provides two `Network` instances which have
    // TRANSPORT_WIFI capability. The first one throws an IOException upon creating a Socket,
    // and the second one actually works. To support such case, here we iterate over all
    // `Network` instances until we can create a Socket.
    for (Network network : allNetworks) {
        if (network == null) {
            continue;
        }

        NetworkCapabilities capabilities = connMan.getNetworkCapabilities(network);
        if (capabilities == null) {
            continue;
        }

        if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
            try {
                SocketFactory factory = network.getSocketFactory();
                if (factory != null) {
                    return factory.createSocket();
                }
            } catch (IOException e) {
                logInfo("IOException during socket creation (ignored): " + e.getMessage());
            }
        }
    }

    logInfo("Cannot find Wi-Fi network to bind a TCP transport.");
    return null;
}