Android mobile phone can be used to obtain IP addresses in two ways

1. Use WIFI

First, set user permissions.

Xml Code

1. <Uses-permission android: name = "android. permission. ACCESS_WIFI_STATE"> </uses-permission>
2. <Uses-permission android: name = "android. permission. CHANGE_WIFI_STATE"> </uses-permission>
3. <Uses-permission android: name = "android. permission. WAKE_LOCK"> </uses-permission>

 

Second, the Code is as follows:

Java code

1. Public void onCreate (Bundle savedInstanceState ){
2. Super. onCreate (savedInstanceState );
3. SetContentView (R. layout. main );
5. // Get the wifi Service
6. WifiManager wifiManager = (WifiManager) getSystemService (Context. WIFI_SERVICE );
7. // Determine whether wifi is enabled
8. If (! WifiManager. isWifiEnabled ()){
9. WifiManager. setWifiEnabled (true );
10. }
11. WifiInfo wifiInfo = wifiManager. getConnectionInfo ();
12. Int ipAddress = wifiInfo. getIpAddress ();
13. String ip = intToIp (ipAddress );
14. EditText et = (EditText) findViewById (R. id. EditText01 );
15. Et. setText (ip );
16. }
17. Private String intToIp (int I ){
19. Return (I & 0xFF) + "." +
20. (I> 8) & 0xFF) + "." +
21. (I> 16) & 0xFF) + "." +
22. (I> 24 & 0xFF );
23. }

 

2. Use GPRS

First, set the user's Internet Access Permissions

Xml Code

1. <Uses-permission android: name = "android. permission. INTERNET"> </uses-permission>

 

Second, the Code is as follows:

Java code

1. Public String getLocalIpAddress ()
2. {
3. Try
4. {
5. For (Enumeration <NetworkInterface> en = NetworkInterface. getNetworkInterfaces (); en. hasMoreElements ();)
6. {
7. NetworkInterface intf = en. nextElement ();
8. For (Enumeration <InetAddress> enumIpAddr = intf. getInetAddresses (); enumIpAddr. hasMoreElements ();)
9. {
10. InetAddress inetAddress = enumIpAddr. nextElement ();
11. If (! InetAddress. isLoopbackAddress ())
12. {
13. Return inetAddress. getHostAddress (). toString ();
14. }
15. }
16. }
17. }
18. Catch (SocketException ex)
19. {
20. Log. e ("WifiPreference IpAddress", ex. toString ());
21. }
22. Return null;
23. }