Android IP address with java

Question

I\'m writing an Android video game that supports multiplayer. There is a dedicated server running which the androids connect to when the multiplayer button is clicked by ope

Answer 1

If you just need the IP for the Wifi connection you can retrieve the IP as a 32 bit integer:

WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ip = wifiInfo.getIpAddress();

Then, in order to construct the IP in dot-decimal notation; bit-shift and mask the result:

String ipString = String.format(
"%d.%d.%d.%d",
(ip & 0xff),
(ip >> 8 & 0xff),
(ip >> 16 & 0xff),
(ip >> 24 & 0xff));

android.permission.ACCESS_WIFI_STATE permission will be required in the manifest.

Answer 2

try this

WifiManager wim= (WifiManager) getSystemService(WIFI_SERVICE)  ;
    List<WifiConfiguration> l=  wim.getConfiguredNetworks(); 
    WifiConfiguration wc=l.get(0); 
textview.append(  "\n"+ Formatter.formatIpAddress(wim.getConnectionInfo().getIpAddress()));

Answer 3

Do you have to rely on the host to figure out its own IP address and provide this to the server? If the host opens a connection and sends a message to the server announcing that it is hosting a game, then could the server use the IP address that the connection and message came from? This would avoid the problem altogether.