[leonsas]

Hello, I'm trying to do an App that displays a ChoiceGroup item of the type POPUP to then do other things.

This is my code:

PHP Code:

package com.client.bberry;

import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.system.*;
import javax.microedition.lcdui.*;

public class Opciones extends UiApplication {
    public static void main(Stringxxx91;xxx93; args) {
        Opciones theApp = new Opciones();
        theApp.enterEventDispatcher();
    }
    
    
    
private Opciones() {
        pushScreen(new OpcionesScreen());
    }
}
final class OpcionesScreen extends MainScreen {
   OpcionesScreen() {
        
         Form Formita = new Form("Select Option");
        ChoiceGroup Lista = new ChoiceGroup("Select your option",Choice.POPUP);
        Lista.append("A",null);
        Lista.append("B",null);
        Lista.append("C",null);
        Formita.append(Lista);
  }  
} 


This just shows and empty white screen. I'm sure I'm missing something very elemental and that you guys will be able to help me out.

Thanks in advance.

[neha.chaudhary]

hi!
1st of all, let me clear one thing that,for appending any item on MainScreen u have to add it one screen.
and 2ndly,
if u will try to add or append Form class on MainScreen,it is not possible bcoz
Form is in javax.microedition api while MainScreen is RIM api.

thnks,
Neha

[leonsas]

So I should remove the Form from my code, and how to add one screen, I thought that was accomplished with the pushScreen().

I'm now trying to do it just with RIM's APIs so here's my try

PHP Code:

package com.client.bberry;

import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.system.*;
import javax.microedition.lcdui.*;
import net.rim.device.api.ui.Field;


public class Opciones extends UiApplication {
    public static void main(Stringxxx91;xxx93; args) {
        Opciones theApp = new Opciones();
        theApp.enterEventDispatcher();
    }
    
    
    
private Opciones() {
        pushScreen(new OpcionesScreen());
    }
}
final class OpcionesScreen extends MainScreen {
   OpcionesScreen() {          
      
       String opcionxxx91;xxx93; = {"A", "B", "C"};
     OpcionesScreen.add(new ObjectChoiceField("Select an option", opcion));

  }  
} 


But I get the following error:

non-static method add(net.rim.device.api.ui.Field) cannot be referenced from a static context
     OpcionesScreen.add(new ObjectChoiceField("Select an option", opcion));
                   ^

What does that mean?
Thanks.

[neha.chaudhary]

Hi!

actually this is basic concept of java,that we cannot reference non static method from static context.
add() method of MainScreen class is non-static method so simple write add(new ObjectChoiceField("Select an option", opcion).
istead of calling it with class name.

thnks

[leonsas]

Thanks, that worked out.
So now I want to add a text field with a NUMERIC constraint, what I wrote was

PHP Code:

 BasicEditField selector = new BasicEditField("Select:","",9,Field.NUMERIC);
add(selector); 


just below the new ObjectChoiceField, but I get the error:

cannot find symbol
symbol  : variable NUMERIC

and

internal error; cannot instantiate BasicEditField(java.lang.String,java.lang.String,int,long) at net.rim.device.api.ui.component.BasicEditField to ()
     BasicEditField selector = new BasicEditField("To:","",9,Field.NUMERIC);
                     ^

Thanks for helping me, I'm slowly learning.

[Dougsg38p]

You want to setFilter() from your BAsicEditField

selector.setFilter(new NumericTextFilter())

[neha.chaudhary]

hi!

whenever u r try to add any item is your class,1stly go through its class.

BasicEditField selector = new BasicEditField("Select:","",9,BasicEditField.FILTE R_NUMERIC);

try to learn things from this link.
file:///C:/Program%20Files/Research%20In%20Motion/BlackBerry%20JDE%204.7.0/docs/api/index.html

thnks

[leonsas]

I get

cannot find symbol
symbol  : class NumericTextFilter

and if I try

PHP Code:

selector.setFilter(new NumericTextFilter(ALLOW_DECIMAL)); 


I also get

cannot find symbol
symbol  : variable ALLOW_DECIMAL

Thanks for the help, never thought learning java by myself was this hard.


EDIT: neha.chaudhary didn't saw your post, what you said does works, now just to learn I want to know why the setFilter() didn't worked out for me, and yes I'm trying to learn from the API Reference but it sometimes gets confusing.

EDIT #2: While trying to set background I did

PHP Code:

BasicEditField hasta = new BasicEditField("To::","",9,BasicEditField.FILTER_NUMERIC){
        public void paint(Graphics g){
        g.setBackgroundColor(Color.DARKBLUE);
        g.clear();
        super.paint(g);
    }
}; 


and it works, but how do I put background to the whole MainScreen?

[neha.chaudhary]

hi!

ALLOW_DECIMAL is static field of class NumericTextFilter.so we have to call it using class name.as we knw static variables are called using Class Name.
selector.setFilter(new NumericTextFilter(NumericTextFilter.ALLOW_DECIMAL) );

[leonsas]

Nope, it didnt worked.

cannot find symbol
symbol : variable NumericTextFilter
location: class com.client.bberry.OpcionesScreen
selector.setFilter(new NumericTextFilter(NumericTextFilter.ALLOW_DECIMAL) );

[leonsas]

Fixed it, I forgot to import it.