Android中获取设备的IP

在wifi环境下，可以通过WifiInfo来获取设备的ip

	public String getIpAddress() {
		WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
		WifiInfo wifiInfo = wifiManager.getConnectionInfo();
		int ipAddress = wifiInfo.getIpAddress();
		int[] ipAddr = new int[4];
		ipAddr[0] = ipAddress & 0xFF;
		ipAddr[1] = (ipAddress >> 8) & 0xFF;
		ipAddr[2] = (ipAddress >> 16) & 0xFF;
		ipAddr[3] = (ipAddress >> 24) & 0xFF;
		return new StringBuilder().append(ipAddr[0]).append(".").append(ipAddr[1]).append(".").append(ipAddr[2])
				.append(".").append(ipAddr[3]).append(".").toString();

	}

执行上面的代码需要

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

当然也可通过jdk总的NetworkInterface来获取的，就是遍历所有的网络接口，获取到非loopback ip

	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("", ex.toString());
		}
		return null;
	}