无法在Android 12中使用onCapabilitiesChanged获得WIFI SSID

Question

描述

我无法在Android-12的onCapabilitiesChanged类中使用ConnectivityManager.NetworkCallback获得WIFI SSID。在Androd-12中，getConnectionInfo是不受欢迎的。因此，正如android文档所示，我正在尝试使用onCapabilitiesChanged来获取onCapabilitiesChanged对象。

像这样，

@Override
public void onCapabilitiesChanged(@NonNull Network network, @NonNull NetworkCapabilities networkCapabilities) {
        super.onCapabilitiesChanged(network, networkCapabilities);
        WifiInfo wifiInfo = (WifiInfo) networkCapabilities.getTransportInfo();
    }

但是，当我打印WifiInfo对象时。它将打印SSID：和getHiddenSSID返回true。

意外的行为是，

Androd-12设备连接一个WIFI (Ex )。( ABC)

• 当我尝试使用getConnectionInfo获取WIFI SSID时。它返回SSID: ABC和getHiddenSSID : false
• 但是，对于同一个网络，当我尝试使用onCapabilitiesChanged获取WIFI SSID时，它将返回SSID:和getHiddenSSID : true

注意:提供了位置权限。

Answer 1

在花了几天时间之后，终于找到了为什么我没有在onCapabilitiesChanged中获得SSID。

在创建对象时，我们需要在FLAG_INCLUDE_LOCATION_INFO构造函数中传递ConnectivityManager.NetworkCallback。

在默认构造函数中，位置敏感信息是隐藏的，因为我们无法在onCapabilitiesChanged中获得SSID。创建带有标志的NetworkCallback对象后，我们将获得SSID。

链接

Answer 2

获取SSID和BSSID API31 Xamarin C#示例

所需权限: CHANGE_NETWORK_STATE、ACCESS_FINE_LOCATION

如果API<31 TransportInfo将返回Null

using Android.Content;
using Android.Net;
using Android.Net.Wifi;

protected override void OnStart()
    {
        base.OnStart();

        NetworkRequest request = new NetworkRequest.Builder().AddTransportType(transportType: TransportType.Wifi).Build();
        ConnectivityManager connectivityManager = Android.App.Application.Context.GetSystemService(Context.ConnectivityService) as ConnectivityManager;

        NetworkCallbackFlags flagIncludeLocationInfo = NetworkCallbackFlags.IncludeLocationInfo;
        NetworkCallback networkCallback = new NetworkCallback((int)flagIncludeLocationInfo);
        connectivityManager.RequestNetwork(request, networkCallback);
    }

    private class NetworkCallback : ConnectivityManager.NetworkCallback
    {
        public NetworkCallback(int flags) : base(flags)
        {
        }

        public override void OnCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities)
        {
            base.OnCapabilitiesChanged(network, networkCapabilities);
            WifiInfo wifiInfo = (WifiInfo)networkCapabilities.TransportInfo;

            if (wifiInfo != null)
            {
                string ssid = wifiInfo.SSID.Trim(new char[] {'"', '\"' });
                string bssid = wifiInfo.BSSID;
            }
        }
    }

单击Android reference.ConnectivityManager.NetworkCallback(int)(https://developer.android.com/reference/android/net/ConnectivityManager.NetworkCallback#NetworkCallback(int%29)!

Answer 3

从new NetworkCallback()替换为new NetworkCallback(ConnectivityManager.NetworkCallback.FLAG_INCLUDE_LOCATION_INFO)。

示例代码：

final NetworkRequest request =
      new NetworkRequest.Builder()
      .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
      .build();
 final ConnectivityManager connectivityManager =
      context.getSystemService(ConnectivityManager.class);
 final NetworkCallback networkCallback = new NetworkCallback(ConnectivityManager.NetworkCallback.FLAG_INCLUDE_LOCATION_INFO) {
      ...
      @Override
      void onAvailable(Network network) {}

      @Override
      void onCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities) {
          WifiInfo wifiInfo = (WifiInfo) networkCapabilities.getTransportInfo();
      }
      // etc.
 };
 connectivityManager.requestNetwork(request, networkCallback); // For request
 connectivityManager.registerNetworkCallback(request, networkCallback); // For listen

参考链接：

https://developer.android.com/reference/android/net/wifi/WifiManager#getConnectionInfo() https://developer.android.com/reference/android/net/ConnectivityManager.NetworkCallback#NetworkCallback(int)