在没有Internet连接的情况下使用WiFi

问题描述

在我的应用中，我正在连接到具有自己的WiFi网络的设备.在android 6及更高版本中，即使没有互联网连接，系统也会在几秒钟后询问我是否要连接到该网络.只有批准该消息后，我才能连接到我的设备.我尝试以编程方式连接到网络，而不是强迫用户每次都手动进行设置并进行连接.我使用以下代码连接到设备网络:

In my app I am connecting to a device that has it's own WiFi network.In android 6 and above the system asks me after a few seconds if I want to connect to this network even though there is no internet connection.Only after approving that message I can connect to my device.I tried connecting to the network programmatically and not force the user to go to his settings and connect manually every time. I used the following code to connect to the devices network:

private void connectToWiFi(WifiManager wifiManager, String wifiName) {

    WifiConfiguration configuration = new WifiConfiguration();
    configuration.SSID = "\"" + wifiName + "\"";
    configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
    wifiManager.addNetwork(configuration);
    List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
    for (WifiConfiguration i : list) {
        if (i.SSID != null && i.SSID.equals("\"" + wifiName + "\"")) {
            wifiManager.disconnect();
            wifiManager.enableNetwork(i.networkId, true);
            wifiManager.reconnect();
            break;
        }
    }
}

，并尝试强制该应用使用WiFi连接，而不是我正在使用的蜂窝数据:

and also trying to force the app to use the WiFi connection and not the cellular data I am using :

NetworkRequest.Builder builder;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        builder = new NetworkRequest.Builder();
        builder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);

        connectivityManager.requestNetwork(builder.build(), new ConnectivityManager.NetworkCallback() {
            @Override
            public void onAvailable(Network network) {
                String ssid = wifiManager.getConnectionInfo().getSSID();
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    connectivityManager.bindProcessToNetwork(null);
                    if (ssid.equals("\"" + Prefs.getWifiName(PUFMainActivity.this) + "\"")) {
                        connectivityManager.bindProcessToNetwork(network);
                        connectivityManager.unregisterNetworkCallback(this);
                    }
                }
            }
        });

    }

尽管只要蜂窝数据处于活动状态，设备就不会出现连接状态.如果我禁用蜂窝数据，那么它可以正常工作.我需要知道是否有一种方法可以以编程方式完成我想做的事情，而无需告诉用户禁用其蜂窝数据.

Although as long as the Cellular data is active the device doesn't apear to be connected. If I disable the Cellular data then it works fine.I need to know if there is a way to do what I want programmatically without telling the user to disable his Cellular data.

谢谢

推荐答案

我正面临着类似的问题.默认解决方案对我不起作用，因此我使用了Network类中的bindSocket方法，显然它可以正常工作.我不知道此解决方案是否适用于您的问题，但这是一些代码:

I was facing a similar problem. The default solution didn't work for me so I used the bindSocket method from Network class, and apparently it is working just fine. I don't know if this solution applies to your problem, but here's some code:

ConnectivityManager connectivityManager = (ConnectivityManager) context.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
Network[] networks = connectivityManager.getAllNetworks();
for(Network network : networks){
   NetworkInfo networkInfo = connectivityManager.getNetworkInfo(network);

   if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI){
       wifiNetwork = network; // Grabbing the Network object for later usage
   }
}

并在套接字之后:

if(android.os.Build.VERSION.SDK_INT >= 22) {
   wifiNetwork.bindSocket(socket);
}

更新:您也可以使用NetworkCallback来捕获Network对象.

UPDATE:You can use a NetworkCallback to grab the Network object as well.

NetworkRequest.Builder builder;
builder = new NetworkRequest.Builder();
builder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
ConnectivityManager connectivityManager = (ConnectivityManager) context.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
connectivityManager.requestNetwork(builder.build(), new ConnectivityManager.NetworkCallback() {
   @Override
   public void onAvailable(Network network) {
      wifiNetwork = network;
   }
});

这篇关于在没有Internet连接的情况下使用WiFi的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！