Android掃描服務器套接字

Question

以下是我的主要活動代碼，該程序運行時沒有錯誤，但我無法獲取由arduino和WiFi護盾運行的服務器的IP地址。我想在他看到服務器並想顯示其IP地址時更新ListView。

public class MainActivity extends Activity { 

ArrayList<PostList> server; 
ArrayAdapter<PostList> adapter; 
ListView server_list; 

Socket socket = null; 
int port = 50000; 
int timeout = 1000; 
final ExecutorService es = Executors.newFixedThreadPool(20); 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    Button scan = (Button)findViewById(R.id.scan); 
    server_list = (ListView)findViewById(R.id.serverlist); 
    server = new ArrayList<PostList>(); 

    scan.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 
      // TODO Auto-generated method stub 
      String iIPv4 = "192.168.254.0"; 
       iIPv4 = iIPv4.substring(0, iIPv4.lastIndexOf(".")); 
       iIPv4 += "."; 

       for (int i = 1; i < 255; i++) { 
        findSocket(es, iIPv4 + i, port, timeout); 
       } 
       adapter = new PostAdapter(MainActivity.this, server); 
       server_list.setAdapter(adapter); 



     } 
    }); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 

public static Future<Boolean> findSocket(final ExecutorService es, 
     final String ip, final int port, final int timeout) { 
    return es.submit(new Callable<Boolean>() { 
     @Override 
     public Boolean call() { 
      try { 
       Socket socket = new Socket(); 
       socket.connect(new InetSocketAddress(ip, port), timeout); 
       socket.close(); 
       ArrayList<PostList> server = new ArrayList<PostList>(); 
       server.add(new PostList(ip)); 

       return true; 
      } catch (Exception ex) { 
       return false; 
      } 
     } 
    }); 
    } 

    } 

Answer 1

得到了答案，但另一個問題是，它運行速度太慢，無法掃描IP地址;

public class MainActivity extends Activity { 

private Button connectPhones; 
private boolean connected = false; 
private String serverIP = "192.168.254."; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    connectPhones = (Button) findViewById(R.id.scan); 
    connectPhones.setOnClickListener(connectListener); 

} 

private OnClickListener connectListener = new OnClickListener() { 

    @Override 
    public void onClick(View v) { 

     if (!connected) { 
       Thread cThread = new Thread(new ClientThread()); 
       cThread.start(); 
     } 
    } 
}; 

public class ClientThread implements Runnable { 

    public void run() { 

     for (int i = 0; i < 255; i++){ 
      String ipadd = serverIP + i; 

     try { 
      Log.d("ClientActivity", "C: Connecting..."); 
      Socket socket = new Socket(ipadd, 50000); 
      connected = true; 
      if (connected) { 
       try { 
        Log.d("ClientActivity", "C: Sending command."); 
        PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket 
           .getOutputStream())), true); 
         out.println("Hey Server im " + ipadd); 
         Log.d("ClientActivity", "C: Sent."); 
       } catch (Exception e) { 
        Log.e("ClientActivity", "S: Error", e); 
       } 
      } 
      socket.close(); 
      Log.d("ClientActivity", "C: Closed."); 
     } catch (Exception e) { 
      Log.e("ClientActivity", "C: Error", e); 
      connected = false; 
     } 
     } 

    } 
} 


}