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a. The class of that object must implement the ''FieldChangeListener'' interface.
b. The source of the event, namely the button object must add this particular listener to the collection of listeners.
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Here is a generic code sample:
1. Build the source object, the button:
ButtonField buttonField = new ButtonField("Test Button");
3. Add the listener object to the list of source listeners:
buttonField.setChangeListener(listener);
Important note: For expressiveness the steps 2 and 3 are combined to produce code like this:
buttonField.setChangeListener(new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
ButtonField buttonField = (ButtonField) field;
System.out.println("Button pressed: " + buttonField.getLabel());
}
});
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Here is the code you must write to add the button ''_buttonGoBack'' to the second screen