Obtain IP address from host name on Android using Xamarin

Question

I wrote an app using WinForms in C#, part of which was to access a device on my local network using its name rather than IP address. This used the function Dns.GetHostEntry() which works as expected. I then created an Android application using Xamarin forms and found that this function is not supported. What is the recommended method of obtaining the IP address from the host name on this platform?

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

For get IP address in Android, you can create a dependenceService in PCL.

   public interface INetServices  
       {  
           string ConvertHostIP();  
       }  

Then achieve this interface in the android folder.

   using System.Collections.Generic;  
   using System.Linq;  
   using System.Net;  
   using System.Text;  
   using Xamarin.Forms;  
     
   [assembly: Dependency(typeof(NetService))]  
   namespace MultilingualXFSample.Droid  
   {  
       class NetService: INetServices  
       {  
     
           public string ConvertHostIP()  
           {  
               WifiManager wifiManager = (WifiManager)Android.App.Application.Context.GetSystemService(Service.WifiService);  
               int ip = wifiManager.ConnectionInfo.IpAddress;  
     
               IPAddress ipAddr = new IPAddress(ip);  
     
              
             //  System.out.println(host);  
               return ipAddr.ToString();  
           }  
       }  
   }  

And add following permission in the AndroidManifest.xml

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

In the Xamarin forms, you can get IP address like following code.

   string IPAddress= DependencyService.Get<INetServices>().ConvertHostIP();  

Best Regards,

Leon Lu

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