Android手机获取IP地址的两种方法

本文章讲解了WIFI和GPRS两种情况下获取手机IP地址的方法

1.使用WIFI

1，首先设置用户权限 AndroidManifest.xml添加：

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

2，在 MainActivity.xml 中加入如下：

public void onCreate(Bundle savedInstanceState) {   

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.activity_main); 

        //获取wifi服务 

        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);  

        //判断wifi是否开启 

        if (!wifiManager.isWifiEnabled()) {   

        wifiManager.setWifiEnabled(true);    

        }  

        WifiInfo wifiInfo = wifiManager.getConnectionInfo();       

        int ipAddress = wifiInfo.getIpAddress();   

        String ip = intToIp(ipAddress);   

        EditText et = (EditText)findViewById(R.id.EditText01);  

        et.setText(ip);  

    }     

    private String intToIp(int i) {        

          return (i & 0xFF ) + "." +       

        ((i >> 8 ) & 0xFF) + "." +       

        ((i >> 16 ) & 0xFF) + "." +       

        ( i >> 24 & 0xFF) ;  

     }   

3.布局文件activity_main.xml

<EditText android:id="@+id/EditText01" android:layout_width="match_parent" android:layout_height="match_parent"/>

2.使用GPRS

1，首先，设置用户上网权限 AndroidManifest.xml

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

2，其次

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

本文地址：https://blog.csdn.net/IT__Small_white/article/details/108574602