Source Code : Many Commands

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Many Commands

/*--------------------------------------------------
* TooManyCommands.java
*
* Example from the book:     Core J2ME Technology
* Copyright John W. Muchow   http://www.CoreJ2ME.com
* You may use/modify for any non-commercial purpose
*-------------------------------------------------*/
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class TooManyCommands extends MIDlet implements CommandListener
{
  private Display display;      // Reference to Display object for this MIDlet
  private Form fmMain;          // The main Form  
  private TextBox tbAction;     // Textbox to show when user selects upload/download
  private Command cmExit;       // Exit the MIDlet
  private Command cmBack;       // Go "back" to the main form
  private Command cmUload;      // "upload" data - no real action done
  private Command cmDload;      // "download" data - no real action done
  
  public TooManyCommands()
  {
    display = Display.getDisplay(this);

    cmExit = new Command("Exit", Command.EXIT, 1);
    cmBack = new Command("Back", Command.BACK, 1);
    cmUload = new Command("Upload", Command.SCREEN, 2);        
    cmDload = new Command("Download", Command.SCREEN, 3);

    // Create the Form, add Commands, listen for events
    fmMain = new Form("Core J2ME");
    fmMain.addCommand(cmExit);
    fmMain.addCommand(cmUload);
    fmMain.addCommand(cmDload);
    fmMain.setCommandListener(this);    

    // Create a Textbox, add Command, listen for events
    tbAction = new TextBox("Process Data", "Upload/download data ", 25, 0);
    tbAction.addCommand(cmBack);
    tbAction.setCommandListener(this);      
  }

  // Called by application manager to start the MIDlet.
  public void startApp()
  {
    display.setCurrent(fmMain);
  }

  // A required method
  public void pauseApp()
  { }

  // A required method
  public void destroyApp(boolean unconditional)
  { }

  // Process events
  public void commandAction(Command c, Displayable s)
  {
    if (c == cmExit)
    {
      destroyApp(false);
      notifyDestroyed();
    }
    else if (c == cmUload || c == cmDload)
      display.setCurrent(tbAction);     
    else if (c == cmBack)
      display.setCurrent(fmMain);     
  }
}

           
       

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