Android Open Source - CleverChat Sender

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From Project

Back to project page CleverChat.

License

The source code is released under:

MIT License

Java Source Code

package threads;
//from  ww w.  j av  a2  s .  c  om
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


/**
 * @author Mentonka Isampel Anna-Maria ==> 3100109
 * @author Pitsios Stamatios ==> 3100153
 * 
 * An instance of this class is the client that will be responsible for sending the messages to the other device.
 */
public class Sender extends Thread
{
  /**
   * The IP of the host device.
   */
  private String hostIP;
  
  /**
   * The message to be sent to the other device.
   */
  private String messageToSend;
  
  /**
   * The context - Activity on which this client is running.
   */
  private Context context;
  
  /**
   * The "connect to chat button" of the interface.
   */
  private Button connectButton;
  
  /**
   * The "send message" button of the interface.
   */
  private Button sendButton;
  
  /**
   * The edit text of interface.
   */
  private EditText editText;
  
  /**
   * The text view of the interface.
   */
  private TextView textView;
  
  
  
  
  public Sender(String ip , Context context , Button btn1 , Button btn2 , EditText edit , TextView textView)
  {
    this.hostIP = ip;
    this.messageToSend = "";
    this.context = context;
    this.connectButton = btn1;
    this.sendButton = btn2;
    this.editText = edit;
    this.textView = textView;
  }
  
  
  
  
  /**
   * Sets the message to be send to the other device , to the value given as parameter.
   * @param msg The message to be send.
   */
  public void setMessage(String msg)
  {
    this.messageToSend = msg;
  }
  
  
  
  
  @Override
  public void run()
  {
    Socket senderSocket = null;
    PrintWriter writer = null;
    
    try
    {
      //Create an address on which the client socket should connect.
      SocketAddress address = new InetSocketAddress(hostIP, 5000);
      
      //Try to connect to the specified address in time less than 7s. Otherwise exception will be thrown.
      senderSocket = new Socket();
      senderSocket.connect(address, 7000);
      
      //Open the writer.
      writer = new PrintWriter(senderSocket.getOutputStream(), true);
      
      /*
       * If the message that we have to send is "!###TEST_CONNECTION_MESS@GE###!" , 
       * this means that we want to test if the host is listening.
       * If yes , then we will show a connection successful message.
       * Otherwise an exception will be thrown.
       */
      if(messageToSend.equals("!###TEST_CONNECTION_MESS@GE###!"))
      {
        /*
         * Run the following code on UIThread , in order to be able to handle the interface components.
         */
        ((Activity)context).runOnUiThread(new Runnable() 
        {
          @Override
          public void run() 
          {
            /*
             * Create and show a message to the current device , indicating that the connection to the host was successful.
             */
            AlertDialog.Builder dialog = new AlertDialog.Builder(context);
                dialog.setMessage("Connection established successfully!");
                dialog.setPositiveButton("OK", new OnClickListener() {
              
                     //Set some of te interface widgets visible.
                     @Override
                     public void onClick(DialogInterface dialog, int which) 
                     {
                       connectButton.setEnabled(false);
                       sendButton.setVisibility(View.VISIBLE);
                       editText.setVisibility(View.VISIBLE);
                       textView.setVisibility(View.VISIBLE);
                     }
                   });
                dialog.show();
          }
        });
        
        writer.println("");
      }
      
      else
      {
        writer.println(messageToSend);        
      }
      
      //Wait for 5 seconds in order to be sure that the message was delivered before attempting to close the connections.
      sleep(5000);
      writer.close();
      senderSocket.close();  
    }
    
    catch (UnknownHostException e) 
    {
      
      ((Activity)context).runOnUiThread(new Runnable() 
      {
        @Override
        public void run() 
        {
          AlertDialog.Builder dialog = new AlertDialog.Builder(context);
              dialog.setMessage("Can not connect to " + hostIP +".\nServer is down or does not exist.\nPlease try later.");
              dialog.setTitle("Error Occurred");
              dialog.setPositiveButton("OK", new OnClickListener() {
            
                   @Override
                   public void onClick(DialogInterface dialog, int which) 
                   {
                     return;
                   }
                 });
                 
                 dialog.show();
        }
      });
        } 
    
    catch (IOException e) 
    {
      ((Activity)context).runOnUiThread(new Runnable() 
      {
        @Override
        public void run() 
        {
          AlertDialog.Builder dialog = new AlertDialog.Builder(context);
              dialog.setMessage("An IOException occured.\nPlease try later.");
              dialog.setTitle("IOException occurred");
              dialog.setPositiveButton("OK", new OnClickListener() {
            
                   @Override
                   public void onClick(DialogInterface dialog, int which) 
                   {
                     return;
                   }
                 });
                 
                 dialog.show();
        }
      });
        } 
    
    catch(Exception e)
    {
      final Exception ex = e;
      
      ((Activity)context).runOnUiThread(new Runnable() 
      {  
        @Override
        public void run() 
        {
          AlertDialog.Builder dialog = new AlertDialog.Builder(context);
              dialog.setMessage(ex.getMessage());
              dialog.setTitle("Exception occurred.");
              dialog.setPositiveButton("OK", new OnClickListener() {
            
                   @Override
                   public void onClick(DialogInterface dialog, int which) 
                   {
                     return;
                   }
                 });
                 
                 dialog.show();
        }
      });
    }
    
  }//run method end.
}

Java Source Code List

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