Question

I have a button and textfield and a checkbox. initially checkbox is checked. when i uncheck the checkbox both button and textbox should be disabled. how to achieve this.

Answer 1

Well make a listener on checkbox. When the checkbox is unchecked, disable the buttonField and the textbox. See an example below:

yourCheckBox.setChangeListener(this);
add(yourCheckBox);
add(textfield);
add(buttonfield);

public void fieldChanged(Field field, int context) {
   if (field == yourCheckBox) {
      if (!youCheckBox.getChecked()) {
         textfield.setEditable(false);
         buttonfield.setEditable(false);
      }
   }
}