适用于Android API的VPN的NetworkInfo 21+

Question

我的问题很简单，Android支持以编程方式检查VPN是否处于活动状态（在API 21+上），请参阅：http : //developer.android.com/reference/android/net/ConnectivityManager.html#TYPE_VPN

我以为我知道它应该如何工作，但是可以使用roboguice进行编码：

@Inject
    boolean checkVPN(ConnectivityManager connMgr) {
        //don't know why always returns null:
        NetworkInfo networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_VPN);

        boolean isVpnConn = networkInfo == null ? false : networkInfo.isConnected();
        return isVpnConn;
    }

始终返回null。适用于WIFI或手机。

是虫子吗？还是我做错了什么？还是我误会了它应该如何工作？

Answer 1

NetworkCapabilities将适用于API 21+。您必须遍历所有现有网络并检查哪个VPN_TRANSPORT

ConnectivityManager cm = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
Network[] networks = cm.getAllNetworks();

Log.i(TAG, "Network count: " + networks.length);
for(int i = 0; i < networks.length; i++) {

  NetworkCapabilities caps = cm.getNetworkCapabilities(networks[i]);

  Log.i(TAG, "Network " + i + ": " + networks[i].toString());
  Log.i(TAG, "VPN transport is: " + caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN));
  Log.i(TAG, "NOT_VPN capability is: " + caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN));

}