Android Open Source - AndroidLookup Lookup Ping Task

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * /* www . ja  v  a2s .  c  om*/
 */
package com.jburto2.androidlookup;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;

import android.app.ProgressDialog;


/**
 * @author James Burton
 * 
 * @class LookupPingTask 
 * @brief This class is an LookupTask that uses java.net.InetAddress to see if a host is rechable or not.
 * 
 * 
 */
public class LookupPingTask extends LookupTask
{
  ProgressDialog progressDialog;
  
  /**
   * @fn protected String doInBackground(String... urls)
   * 
   * @brief This function uses java.net.InetAddress to determine if the host is reachable.
   * 
   * @param urls Array of strings that are arguments to the function. url[0] is the address to lookup.
   * @return "Yes" if host is reachable.
   * @return "No" if host is not reachable or if an exception is generated. 
   * @exception Exception generated from InetAddress call is stored in the public instance variable exception.
   * 
   */
  
    protected String doInBackground(String... urls) 
    {
      String url = urls[0];
      
      try 
      {
        ///Found NSLookup from http://www.coderanch.com/t/328875/java/java/nslookup-Java
        ///More on inet addresses from http://download.java.net/jdk7/archive/b123/docs/api/java/net/InetAddress.html 
        InetAddress ipAddress = InetAddress.getByName(url);
      //return ipAddress.getHostName();
        if (ipAddress.isReachable(3000))
        {
          return "Yes";
        }
        else
        {
          return "No";
        }
      }
      catch(UnknownHostException e)
      {
        this.exception = e;
          return "No";
        } 
      catch(IOException io)
      {
        this.exception = io;
        return "No";
      }
    }
    

    
    /**
     * @fn protected void onPostExecute(String str)
     * 
     * @brief Method to be done after the task has executed.
     * @param str Some string 
     */

    protected void onPostExecute(String str) 
    {
        // TODO: check this.exception 
        // TODO: do something with the feed
    }

}

Java Source Code List

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