Android Open Source - aoc-keyboard Network Discovery

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Back to project page aoc-keyboard.

License

The source code is released under:

GNU General Public License

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Java Source Code

package com.thiago.aockeyboard.client;
/*from   w  w  w .j av a2  s  .c o  m*/
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import android.util.Log;

public class NetworkDiscovery {
  
  private static final int TIMEOUT = 500;
  protected static final String TAG = "SecondScreen";
  private static final int PORT = 1212;
  
  static ExecutorService es;
  
  private class Candidate{
    String ip;
    boolean active;
    
    public Candidate(String ip, boolean active) {
      this.ip = ip;
      this.active = active;
    }
    
    public String getIp() {
      return ip;
    }
    
    public boolean isActive() {
      return active;
    }
  }
  
  public static ArrayList<String> findTvInNetwork(String deviceIp){
    ArrayList<String> res = new ArrayList<String>();
    es = Executors.newFixedThreadPool(20);
    final List<Future<Candidate>> futures = new ArrayList<Future<Candidate>>();
    String[] ipArr = deviceIp.split("\\.");
    for(int i = 1 ; i < 254 ; i++){
      String ipNow = ipArr[0]+"."+ipArr[1]+"."+ipArr[2]+"."+i;
      futures.add(portIsOpen(es, ipNow, PORT, TIMEOUT));
    }
    try {
      es.awaitTermination(10, TimeUnit.SECONDS);
      es.shutdown();
    } catch (InterruptedException e1) {
      Log.e(TAG,e1.getMessage());
    }
    int open=0;
    for(final Future<Candidate> f : futures){
      try {
        if(f.get().isActive()){
          open++;
          res.add(f.get().getIp());
        }
      } catch (InterruptedException e) {
        e.printStackTrace();
      } catch (ExecutionException e) {
        e.printStackTrace();
      }
    }
        Log.v(TAG, "found "+open+" tvs");
        return res;
  }

  public static Future<Candidate> portIsOpen(final ExecutorService es, final String ip, final int port, final int timeout) {
      return es.submit(new Callable<Candidate>() {
          @Override public Candidate call() {
            try {
              Socket socket = new Socket();
              socket.connect(new InetSocketAddress(ip, port), timeout);
              Log.v(TAG, "found using TCP connect "+ip+" on port=" + port);
              socket.close();
              NetworkDiscovery a = new NetworkDiscovery();
              Candidate candidate = a.new Candidate(ip, true);
              return candidate;
            } catch (Exception ex) {
              NetworkDiscovery a = new NetworkDiscovery();
              Candidate candidate = a.new Candidate(ip, false);
              return candidate;
            }
          }
       });
  }
  
}

Java Source Code List