[Aporte] Mi primera aplicacion para celular

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package hello;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 * @author Only
 */
public class HelloMIDlet extends MIDlet implements CommandListener {
    
    private boolean midletPaused = false;
//<editor-fold defaultstate="collapsed" desc=" Generated Fields ">                      
private Command exitCommand;
private Command okCommand;
private Form form;
private StringItem stringItem;
private TextField textField;
//</editor-fold>                    

    /**
     * The HelloMIDlet constructor.
     */
    public HelloMIDlet() {
    }

//<editor-fold defaultstate="collapsed" desc=" Generated Methods ">                       
//</editor-fold>                     
//<editor-fold defaultstate="collapsed" desc=" Generated Method: initialize ">                                           
/**
 * Initializes the application.
 * It is called only once when the MIDlet is started. The method is called before the <code>startMIDlet</code> method.
 */
private void initialize () {                                         
        // write pre-initialize user code here
                                           
        // write post-initialize user code here
}                            
//</editor-fold>                          

//<editor-fold defaultstate="collapsed" desc=" Generated Method: startMIDlet ">                                        
/**
 * Performs an action assigned to the Mobile Device - MIDlet Started point.
 */
public void startMIDlet () {                                      
        // write pre-action user code here
switchDisplayable (null, getForm ());                                        
        // write post-action user code here
}                             
//</editor-fold>                           

//<editor-fold defaultstate="collapsed" desc=" Generated Method: resumeMIDlet ">                                         
/**
 * Performs an action assigned to the Mobile Device - MIDlet Resumed point.
 */
public void resumeMIDlet () {                                       
        // write pre-action user code here
                                         
        // write post-action user code here
}                              
//</editor-fold>                            

//<editor-fold defaultstate="collapsed" desc=" Generated Method: switchDisplayable ">                                              
/**
 * Switches a current displayable in a display. The <code>display</code> instance is taken from <code>getDisplay</code> method. This method is used by all actions in the design for switching displayable.
 * @param alert the Alert which is temporarily set to the display; if <code>null</code>, then <code>nextDisplayable</code> is set immediately
 * @param nextDisplayable the Displayable to be set
 */
public void switchDisplayable (Alert alert, Displayable nextDisplayable) {                                            
        // write pre-switch user code here
Display display = getDisplay ();                                               
if (alert == null) {
display.setCurrent (nextDisplayable);
} else {
display.setCurrent (alert, nextDisplayable);
}                                             
        // write post-switch user code here
}                                   
//</editor-fold>                                 

//<editor-fold defaultstate="collapsed" desc=" Generated Method: commandAction for Displayables ">                                                 
/**
 * Called by a system to indicated that a command has been invoked on a particular displayable.
 * @param command the Command that was invoked
 * @param displayable the Displayable where the command was invoked
 */
public void commandAction (Command command, Displayable displayable) {                                               
        // write pre-action user code here
if (displayable == form) {                                           
if (command == exitCommand) {                                         
                // write pre-action user code here
exitMIDlet ();                                           
                // write post-action user code here
} else if (command == okCommand) {                                          
    String fahrenheit;
    float grad_cel,grad_farh;
    float a = 1.8F;
    
    fahrenheit = textField.getString();
    
    grad_farh = Float.parseFloat(fahrenheit);
    
    grad_cel = (grad_farh-32);
    
    stringItem.setText(grad_farh + " Grados Fahrenheit = " + grad_cel + " Grados Celsius ");
                                           
 // write post-action user code here
}                                                  
}                                                
        // write post-action user code here
}                               
//</editor-fold>                             

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: exitCommand ">                                   
/**
 * Returns an initiliazed instance of exitCommand component.
 * @return the initialized component instance
 */
public Command getExitCommand () {
if (exitCommand == null) {                                 
            // write pre-init user code here
exitCommand = new Command ("Exit", Command.EXIT, 0);                                   
            // write post-init user code here
}                         
return exitCommand;
}
//</editor-fold>                       

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: form ">                                   
/**
 * Returns an initiliazed instance of form component.
 * @return the initialized component instance
 */
public Form getForm () {
if (form == null) {                                 
            // write pre-init user code here
form = new Form ("Convertidor @Only", new Item[] { getTextField (), getStringItem () });                                    
form.addCommand (getExitCommand ());
form.addCommand (getOkCommand ());
form.setCommandListener (this);                                  
            // write post-init user code here
}                         
return form;
}
//</editor-fold>                       



//<editor-fold defaultstate="collapsed" desc=" Generated Getter: okCommand ">                                   
/**
 * Returns an initiliazed instance of okCommand component.
 * @return the initialized component instance
 */
public Command getOkCommand () {
if (okCommand == null) {                                 
 // write pre-init user code here
okCommand = new Command ("Convertir", Command.OK, 0);                                   
 // write post-init user code here
}                         
return okCommand;
}
//</editor-fold>                       

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: textField ">                                   
/**
 * Returns an initiliazed instance of textField component.
 * @return the initialized component instance
 */
public TextField getTextField () {
if (textField == null) {                                 
 // write pre-init user code here
textField = new TextField ("Ingrese el valor de los grados Fahrenheit", null, 32, TextField.ANY);                                   
 // write post-init user code here
}                         
return textField;
}
//</editor-fold>                       

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: stringItem ">                                   
/**
 * Returns an initiliazed instance of stringItem component.
 * @return the initialized component instance
 */
public StringItem getStringItem () {
if (stringItem == null) {                                 
 // write pre-init user code here
stringItem = new StringItem ("", null);                                   
 // write post-init user code here
}                         
return stringItem;
}
//</editor-fold>                       

    /**
     * Returns a display instance.
     * @return the display instance.
     */
    public Display getDisplay() {
        return Display.getDisplay(this);
    }

    /**
     * Exits MIDlet.
     */
    public void exitMIDlet() {
        switchDisplayable(null, null);
        destroyApp(true);
        notifyDestroyed();
    }

    /**
     * Called when MIDlet is started.
     * Checks whether the MIDlet have been already started and initialize/starts or resumes the MIDlet.
     */
    public void startApp() {
        if (midletPaused) {
            resumeMIDlet();
        } else {
            initialize();
            startMIDlet();
        }
        midletPaused = false;
    }

    /**
     * Called when MIDlet is paused.
     */
    public void pauseApp() {
        midletPaused = true;
    }

    /**
     * Called to signal the MIDlet to terminate.
     * @param unconditional if true, then the MIDlet has to be unconditionally terminated and all resources has to be released.
     */
    public void destroyApp(boolean unconditional) {
    }
}