android擷取本地IP

用WifiManager 方式來擷取：

public String getIp(){ 

//擷取wifi服務
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
//判斷wifi是否開啟
if (!wifiManager.isWifiEnabled()) {
wifiManager.setWifiEnabled(true);
}
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();
String ip = intToIp(ipAddress);
return ip;

}

private String intToIp(int i) {

return (i & 0xFF ) + "." +
((i >> 8 ) & 0xFF) + "." +
((i >> 16 ) & 0xFF) + "." +
( i >> 24 & 0xFF) ;
}

當然要加許可權

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

//結束

另外一種既是java的擷取方式

public String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {

NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress().toString();
}
}
}
} catch (SocketException ex) {
Log.e("here", ex.toString());
}
return null;
}

//需要添加的許可權

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

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

<uses-permission android:name="android.permission.WAKE_LOCK"/>

<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>