UI components in Blackberry

The net.rim.device.api.ui package contains the fundamental classes that are used for all UI applications:

• Field: A rectangular area that can be drawn on the screen of a device.
• Manager: An area that contains other UI components and handles layout and scrolling behavior.
• Screen: A drawable area that is pushed on to and popped off of an application's display stack.

For convenience, the net.rim.device.api.ui.component package contains prebuilt UI components such as the following:

• ButtonField: A simple button.
• DateField: A field that contains date and time values.
• LabelField: A text label.
• TextField: An editable text field.

For more information about the classes in the net.rim.device.api.ui.component package, see UI components.
The net.rim.device.api.ui.container package contains classes that you can use to arrange UI components on a screen, such as:

• FlowFieldManager: A manager that arranges fields horizontally and then vertically.
• HorizontalFieldManager: A manager that arranges fields in a single horizontal row.
• VerticalFieldManager: A manager that arranges fields in a single vertical column.

Button -

 ButtonField mySubmitButton = new ButtonField("Submit");

CheckBox  -
  CheckboxField chk=new CheckboxField("First Check Box", true);

 CheckboxField chk=new CheckboxField("First Check Box", false);

DialogBox - 

  Dialog.alert("Specify the alert text that you want to display.")

LabelField -

 LabelField title = new LabelField("UI Component Sample", LabelField.ELLIPSIS);

RadioButton -

 RadioButtonGroup rbg = new RadioButtonGroup();
add(new RadioButtonField("Option 1",rbg,true));
add(new RadioButtonField("Option 2",rbg,false));
 

DateTimePicker -

DateTimePicker datePicker = DateTimePicker.getInstance();
datePicker.doModal();
Calendar cal = datePicker.getDateTime();
Date date = cal.getTime();
Dialog.alert("You selected " + date.toString()); 

FilePicker -

FilePicker fp = FilePicker.getInstance();
FilePickListener fileListener = new FilePickListener();
fp.setListener(fileListener);           
fp.show();   

class FilePickListener implements FilePicker.Listener 
{   
    public void selectionDone(String str)
    {
        Dialog.alert("You selected " + str);
    }
}

Text Fields - 

RichTextField rich = new RichTextField("RichTextField");

BasicEditField bf = new BasicEditField(
     "BasicEditField: ", "", 10, EditField.FILTER_UPPERCASE);

EditField edit = new EditField(
            "EditField: ", "", 10, EditField.FILTER_DEFAULT);

AutoTextEditField autoT = new AutoTextEditField(
             "AutoTextEditField: ", "");

PasswordEditField pwd = new PasswordEditField("PasswordEditField: ", "");