MainActivity如下:

package cn.testip;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import android.os.Bundle;
import android.app.Activity;
/**
 * Demo描述:
 * 获取移动设备的IP地址
 */
public class MainActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		String IP=getIP();
		System.out.println("The IP of this handset is : "+IP);
	}
	
	private String getIP() {
		String IP = null;
		StringBuilder IPStringBuilder = new StringBuilder();
		try {
			Enumeration<NetworkInterface> networkInterfaceEnumeration = NetworkInterface.getNetworkInterfaces();
			while (networkInterfaceEnumeration.hasMoreElements()) {
				NetworkInterface networkInterface = networkInterfaceEnumeration.nextElement();
				Enumeration<InetAddress> inetAddressEnumeration = networkInterface.getInetAddresses();
				while (inetAddressEnumeration.hasMoreElements()) {
					InetAddress inetAddress = inetAddressEnumeration.nextElement();
					if (!inetAddress.isLoopbackAddress()&& 
						!inetAddress.isLinkLocalAddress()&& 
						 inetAddress.isSiteLocalAddress()) {
						 IPStringBuilder.append(inetAddress.getHostAddress().toString()+"\n");
					}
				}
			}
		} catch (SocketException ex) {

		}

		IP = IPStringBuilder.toString();
		return IP;
	}
}

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="获取设备的IP" 
        android:layout_centerInParent="true"
        android:textSize="28sp"
    />

</RelativeLayout>