Android™

Bind and Listen on a Randomly Selected Unused Port

See more Socket/SSL/TLS Examples

Demonstrates how to bind and listen on a randomly selected unused port.

Note:The ListenPort property used in this example is available starting in Chilkat v9.5.0.59.

Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkSocket listenSocket = new CkSocket();

    //  Pass a value of 0 for the port number to randomly select
    //  an unused port.
    //  (The 2nd argument allows for a backlog of 25 pending connection requests when accepting connections.)
    success = listenSocket.BindAndListen(5555,25);
    if (success != true) {
        Log.i(TAG, listenSocket.lastErrorText());
        return;
        }

    //  Find out what port was chosen.
    //  Note: The ListenPort propety was added in Chilkat v9.5.0.59
    int listenPort = listenSocket.get_ListenPort();
    Log.i(TAG, "Chosen listen port = " + String.valueOf(listenPort));

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}