Blackberry Development

Moving to a New Screen with pushScreen

2011-05-24T14:02:00.000-07:00

You can move to a new screen really easily but pushScreen. Create a new .java file named Question1.java. This will be our new screen. The basic new screen class is below, fill in the class name and constructor to the name of you java file.

/**
* A class extending the MainScreen class, which provides default standard
* behavior for BlackBerry GUI applications.
*/
public final class Question1 extends MainScreen
{
    /**
     * Creates a new Question1 object
     */
    public Question1()
    {
        // Set the displayed title of the screen
        setTitle("Question 1");
    }
}

So now, we can add a button, and make the button listener move to the new screen. This code should be in the "MyScreen" (your main screen) java file.

ButtonField btnNext = new ButtonField("Next question (2)", ButtonField.CONSUME_CLICK);
        FieldChangeListener customListener = new FieldChangeListener() {
            public void fieldChanged(Field field, int context)
            {
                UiApplication.getUiApplication().pushScreen(new Question1());
            }
        };
        btnNext.setChangeListener(customListener);
        this.add(btnNext);

Blackberry RadioButtonField Example

2011-05-14T15:58:00.000-07:00

How to use Blackberry RadioButtonField.

//create a new set of radio buttons in a group
RadioButtonGroup rgrp = new RadioButtonGroup();

//new radio to the group
RadioButtonField radio = new RadioButtonField("Radio Button 1", rgrp, true);
add(radio);

//another radio to the group
RadioButtonField radio2 = new RadioButtonField("Radio Button 2", rgrp, false);
add(radio2);

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Blackberry BitmapField Example

2011-05-14T15:54:00.000-07:00

How to use Blackberry BitmapField.

//create a new BitmapField
Bitmap bm = Bitmap.getBitmapResource("images/test.png");
BitmapField bf = new BitmapField(bm, BitmapField.FOCUSABLE);
add(bf);

You can add images to development folder where the source files are.

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Blackberry PasswordEditField Example

2011-05-14T15:45:00.000-07:00

How to use Blackberry PasswordEditField.

//create a new PasswordEditField
PasswordEditField pwf = new PasswordEditField();
add(pwf);

//create a new PasswordEditField with label and initial value
PasswordEditField pwf2 = new PasswordEditField("Password: ", "mypassword");
add(pwf2);

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Blackberry EditField Example

2011-05-14T15:36:00.000-07:00

How to use Blackberry EditField.

//create a new editfield
EditField ef = new EditField();
add(ef);

//create a new editfield with default text and label
EditField ef2 = new EditField("Message:", "Hello World!");
add(ef2);

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Blackberry RichTextField Example

2011-05-14T15:27:00.000-07:00

How to use Blackberry RichTextField.

//create a new RichTextField
RichTextField rtf = new RichTextField();
add(rtf);

//create a new RichTextField with a style, in this case "non focusable"
RichTextField rtf2 = new RichTextField(NON_FOCUSABLE);
add(rtf2);

//create a new RichTextField with default text
RichTextField rtf3 = new RichTextField("Hello World!");
add(rtf3);

Download Project Source

Blackberry LabelField Example

2011-05-14T15:04:00.000-07:00

How to use Blackberry LabelField.

//new labelfield with no default text
LabelField lf = new LabelField();
lf.setText("Hello World!");
add(lf);

//new labelfield with default text
LabelField lf2 = new LabelField("Hello World!");
add(lf2);

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