How to do an action when a LWUIT List item clicked - java-me

Question

I have a LWUIT application that has a list which involving some items.
The list itself has been added to a Combobox .
1/ How I change the colour of an item of list when I focus on it?
final com.sun.lwuit.List mylist = new com.sun.lwuit.List();
mylist.addItem("one");
mylist.addItem("two");
mylist.addItem("three");
mylist.addItem("four");
final com.sun.lwuit.ComboBox combo = new com.sun.lwuit.ComboBox (mylist.getModel());
final com.sun.lwuit.Form ff = new com.sun.lwuit.Form();
ff.addComponent(combo);
2/ I want to do an action when I click ( or double click ) on an item ,
ActionListener interface didn't make that for me , can someone guide me?
mylist.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ev)
{
System.out.println("java");
}
}
);

Answer 1

You Should set a renderer to ComboBox and can use both of setRenderer and setListCellRenderer but setListCellRenderer is
deprecated than use setRenderer:
combo.setRenderer(new ListCellRenderer() {
public Component getListCellRendererComponent(List list, Object value, int index, boolean isSelected) {
Label l = new Label(String.valueOf(value));
l.getStyle().setBgColor(0xffaa00);
return l;
}
public Component getListFocusComponent(List list) {
Label l = new Label(String.valueOf(list.getSelectedItem()));
l.getStyle().setBgColor(0x00ff00);
return l;
}
});
this working well.

Answer 2

To change the colour of a ComboBox you should modify the ComboBoxFocusstyle from the ResourceEditor.
If you are adding the list to the ComboBox, I think that you should put the ActionListener to the ComboBox not to the List as you are doing. Try this facts.

Answer 3

You can work with ListCellRenderer. Its helpful tool ,
look here for example
You can implement getListCellRendererComponent(..)- this function return the compenents that display on screen and responsible on UI.
If you work with ListCellRenderer you can use actionLisiner like this:
mylist.setRenderer(getListCellRenderer());
ActionListener chooseItemActionListener = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
doAction(getSelected());
}
};
mylist.addActionListener(chooseItemActionListener);