mainscreen.java

symbian的蓝牙名片交换源代码

// Copyright 2006 Nokia Corporation.
//
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//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
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// Corporation.
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package bcexchanger.ui;

import java.io.IOException;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;
import bcexchanger.*;
import bcexchanger.comm.ExchangerCommImpl;
import bcexchanger.comm.ServiceDiscoveryState;

/**
 * 
 * This class implements the main screen of the application. Using
 * this screen user can initiate an exchange of business cards, change
 * own business card and exit the application
 * 
 * The class is extending an example.BCExchanger.ui.Screen class
 * 
 * @version 1.0 29.09.2005
 * @see example.BCExchanger.ui.Screen Design patterns: State
 */
public class MainScreen extends Screen {

  private Command changeBCCommand;
  private Command exitCommand;
  private Command sendBCCommand;
  private TextBox textBox;
  
  private int typeOfOperation = ServiceDiscoveryState.PUT;

  /**
   * Constructor
   * 
   * @param _midlet -
   *          the parent class which keeps the current UI state
   */
  public MainScreen(BCExchangerMIDlet _midlet) 
  {
    super(_midlet);
    midlet.initComm(); // init happens only the first time MainScreen
                        // is created
    String text = "Business Card Exchanger allows you to define your own business card "
        + "and exhange it with business cards of other users in vicinity "
        + "running the same application. The exchange is done over Bluetooth "
        + "and free of charge.\n\n"
        + "Use 'Change own card' to choose own card from the address book.\n"
        + "Use 'Exchange card' to initate the search and exchange of the cards.\n\n"
        + "The application is always waiting for connections from remote devices.";
   
    textBox = new TextBox("Business Card Exchanger", text, 999, TextField.UNEDITABLE);

    changeBCCommand = new Command("Change own card", Command.ITEM, 1);
    exitCommand = new Command("Exit", Command.EXIT, 1);
    sendBCCommand = new Command("Exchange cards", Command.ITEM, 1);

    textBox.addCommand(changeBCCommand);
    textBox.addCommand(exitCommand);
    textBox.addCommand(sendBCCommand);
    textBox.setCommandListener(this);

    displayable = textBox;
  }

  public void commandAction(Command command, Displayable _displayable) {

    if (_displayable != textBox) {
      throw new RuntimeException("Internal error #16");
    }
    if (command == sendBCCommand) {
      try 
      {    	  
    	  setTypeOfOperation(ServiceDiscoveryState.PUT);
    	  ((ExchangerCommImpl)midlet.getExchanger()).startSending(ServiceDiscoveryState.PUT);
    	  String text = "Searching for devices...";
    	  midlet.changeScreen(new ProgressScreen(midlet, text));
      } 
      catch (IOException e0) {
        midlet.changeScreen(new AlertMessage(midlet,
            "Cannot start inquiry "+e0, null));
      } catch (Exception e1) {
      }
    } 
   
    else if (command == changeBCCommand) {

      midlet.changeScreen(new AddressBookScreen(midlet));
    } else if (command == exitCommand) {
      midlet.quit();
    } else {
      // unknown command
      throw new RuntimeException("Internal error #18");
    }
  }

  public int getTypeOfOperation() {
	return typeOfOperation;
  }

  public void setTypeOfOperation(int typeOfOperation) {
	this.typeOfOperation = typeOfOperation;
  }
}