I'm trying to implement peer-to-peer communication (device to device) and I need to get the real IP of the server device to then insert into the client but I can not. I'm using:
ServerSocket server = new ServerSocket(8000);
Log.v("TAG", server.getInetAddress().getHostAddress().toString());
and returns me only "::".
You will need to make a request to an external server to know the IP. Something like this:
https://github.com/kost/external-ip
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In the case of Wi-Fi IP:
WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
String ip = Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());
Turning on the manifest:
ACCESS_WIFI_STATE