检测Android手机的IP地址

package com.jason.demo.androidip;

import android.content.Context;
import android.net.DhcpInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.text.format.Formatter;

public class IPAddress {

    public String getIPAddress(Context ctx){
 //获取wifi服务
       WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
      //判断wifi是否开启  如果没有开启  此方法会开启wifi
       if (!wifiManager.isWifiEnabled()) {
      wifiManager.setWifiEnabled(true);
        }  

        WifiManager wifi_service = (WifiManager) ctx.getSystemService(Context.WIFI_SERVICE);
        DhcpInfo dhcpInfo = wifi_service.getDhcpInfo();
        WifiInfo wifiinfo = wifi_service.getConnectionInfo();
        System.out.println("Wifi info----->"+wifiinfo.getIpAddress());
        System.out.println("DHCP info gateway----->"+Formatter.formatIpAddress(dhcpInfo.gateway));
        System.out.println("DHCP info netmask----->"+Formatter.formatIpAddress(dhcpInfo.netmask));
        //DhcpInfo中的ipAddress是一个int型的变量，通过Formatter将其转化为字符串IP地址
        return Formatter.formatIpAddress(dhcpInfo.ipAddress);
    }
}

最后要说的是  添加权限

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