Android Open Source - CleverChat Main Activity

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From Project

Back to project page CleverChat.

License

The source code is released under:

MIT License

Java Source Code

package com.example.cleverchat;
//from  w w w  .  j  av a 2  s .  c  om
import threads.Receiver;
import threads.Sender;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.Menu;
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
 * 
 * The main activity of the application.
 */
public class MainActivity extends Activity
{
  /**
   * Object receiver that represents the server
   */
  private Receiver receiver = null;
  
  /**
   * Object sender that represents the client
   */
  private Sender sender = null;
  
  /**
   * The name of user of the chat
   */
  private String myName;
  
  /**
   * The ip on which the client of this device will connect.
   */
  private String IP;
  
  /**
   * The message to be sent to the other device.
   */
  private String message;
  
  
  
  
  /**
   *  Method called when the activity is starting.
   */
  @Override
  protected void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
      
    //TextView that holds all the messages sent and received.
    TextView textView = (TextView)findViewById(R.id.textChat);
    
    //Start the receiver.
    receiver = new Receiver(textView , this);
    receiver.start();
  }
  
  
  
  
  /**
   * Method that initializes the contents of the Activity's standard options menu.
   */
  @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;
  }
  
  
  
  
  /**
   *  Method called when activity is destroyed.
   */
  @Override
  public void onDestroy()
  {
    super.onDestroy();
  }
  
  
  
  
  /**
   *  Method called when the activity has detected the user's press of the back key.
   */
  @Override
  public void onBackPressed()
  {
      this.exitApp();
  }
  
  
  
  
  /**
   * Method called when the Button "Start Chat" is pressed.
   * It opens a dialog window in order to insert the information necessary to connect with the co-chatter.
   * @param view
   */
  public void startChat(View view)
  {  
    LayoutInflater inflater = LayoutInflater.from(this);
    
    final View dialogLayout = inflater.inflate(R.layout.connect_to_chat_layout, null);
    
    AlertDialog.Builder dialog = new AlertDialog.Builder(this);
    
    dialog.setView(dialogLayout);
    
    // The title of the dialog window
    dialog.setTitle("Connect to chat");
    
    // Set positive option of the dialog window
    dialog.setPositiveButton("Connect", new OnClickListener() {
      
      @Override
      public void onClick(DialogInterface dialog, int which) 
      {
        // The ip address of the co-chatter
        EditText editIP = ((EditText)dialogLayout.findViewById(R.id.hostIpInput));
        
        // The name of the current user of the chat
        EditText editName = ((EditText)dialogLayout.findViewById(R.id.userNameInput));
        
        IP =    editIP.getText().toString();
        myName = editName.getText().toString();
        message = "!###TEST_CONNECTION_MESS@GE###!";
        
        // Start the client
        startClient();
      }
    });
    
    // Set negative option of the dialog window
    dialog.setNegativeButton("Cancel", new OnClickListener() {
      
      @Override
      public void onClick(DialogInterface dialog, int which) 
      {
        return;
      }
    });
      
    dialog.show();
  }
  
  
  
  
  /**
   * Method called in order to start the sender (client)
   */
  public void startClient()
  {
    //Initialize the sender.
    sender = new Sender(IP , this , (Button)findViewById(R.id.start_chat) , (Button)findViewById(R.id.sendMessage) , (EditText)findViewById(R.id.chatMessage) , (TextView)findViewById(R.id.textChat));
    
    //Set the message to be sent.
    sender.setMessage(this.message);
    
    // Start the sender
    sender.start();        
  }
  
  
  
  
  /**
   * Method called when the Button "Quit" is pressed.
   * @param view
   */
  public void Quit(View view)
  {
    this.exitApp();
    }
  
  
  
  
  /**
   * Method that performs the necessary actions before the activity is destroyed.
   */
  private void exitApp()
  {
    //Send a message to the other device , to inform it that the chat will now terminate.
    this.message = "###!TERMIN@TE_CH@T!###";
    this.startClient();
    
    //If the receiver is not null, stop the receiver.
    if(!(receiver == null)) this.receiver.Stop();
      
    try
    {  
      //Wait for 2 seconds to be sure that the "###!TERMIN@TE_CH@T!###" message will be sent before the application is closed.
      Thread.sleep(2000);
      
      //Exit the app.
      this.onDestroy();
      finish();
      System.exit(0);
    }
    
    catch(Exception e)
    {
      
    }  
  }
  
  
  
    
  /**
   * Method called when the Button "Send Message" is pressed.
   * The Method gets the message written from the user and sends it to the co-chatter.
   * It also appends the message to the textView that holds all the messages sent and received.
   * @param view
   */
  public void sendMessage(View view)
  {
    // The message written by the current user .
    EditText myMessage = (EditText) findViewById(R.id.chatMessage);
    String text = myMessage.getText().toString();
    
    // The messages sent and received
    TextView textView = (TextView)findViewById(R.id.textChat);
    
    // The message to send in the format : " User's name : Message to send " .
    String newText = this.myName + " wrote : "+ text;
    
    // Append the message the current user wrote to the textView and color it dark green.
    textView.append(Html.fromHtml("<font color='#003324'><b>"+newText + "</b></font>"));
    textView.append("\n\n");
    
    //Set the message to the input given and send it.
    this.message = newText;
    this.startClient();
    
    // EditText emptied
    myMessage.setText("");
  }
}

Java Source Code List

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