如何获取我的Android设备的动态IP地址

Question

我给出了android清单文件中访问Internet的权限，如下所示。 <uses-permission android:name="android.permission.INTERNET" />

以下代码将写入简单的应用程序。

package com.GetIP; 


import java.net.InetAddress; 
import android.app.Activity; 

import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 

public class IPAddress extends Activity { 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    Button b=(Button)findViewById(R.id.btn1); 

    b.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 

      // TODO Auto-generated method stub 
      try 
       { 
        InetAddress ownIP=InetAddress.getLocalHost(); 
        //System.out.println("IP of my Android := "+ownIP.getHostAddress()); 

        Toast.makeText(getApplicationContext(), ownIP.toString(), Toast.LENGTH_LONG).show(); 
       } 
       catch (Exception e) 
       { 
        System.out.println("Exception caught ="+e.getMessage()); 
        } 
     } 
    }); 
} 

}

上面的代码中给出了把为localhost/127.0.0.1，但它的默认IP地址，但我想我的设备的动态IP地址的聊天应用程序中使用。

Answer 1

您可以使用以下代码获取连接到设备的IP地址列表。

public static List<String> getLocalIpAddress() { 
    List<String> list = new ArrayList<String>(); 
    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()) { 
        list.add(inetAddress.getHostAddress().toString()); 
       } 
      } 
     } 
    } catch (SocketException ex) { 
     Log.e(TAG, ex.toString()); 
    } 
    return list; 
} 

Answer 2

这段代码会给你的本地IP地址：

public static String getLocalIpAddressString() { 
    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) { 
    } 

    return null; 
}