Question

i am developing a simple calculator application in blackberry now, and i am new to that environment.
i want to develop an application(calculator) which runs in a list like. probably there will be more simpler ways for implementing this. but i want to study with my stuff.

value1    : (numeric textfield)
value1    : (numeric textfield)

+         : (result(value1+value2))
-         : (result(value1-value2))
*         : (result(value1*value2))
/         : (result(value1/value2))

for this application, I have developed using eclipse as..

public class Scr_Main extends MainScreen
{

    String my_array[] = new String[]{"+", "-", "*","/"};
    EditField editfield_value1,editfield_value2;
    ObjectListField my_list;
    GridFieldManager gfm;

    public Scr_Main()
    {
        this.setTitle("Address Book");
        //Defining Components 

        gfm = new GridFieldManager(1, 1, 0);
        editfield_value1 = new EditField("Enter Value :", "");
        add(gfm);

            gfm = new GridFieldManager(1, 1, 0);
        editfield_value2 = new EditField("Enter Value :", "");
        add(gfm);

        my_list= new ObjectListField();
        my_list.set(my_array);
        add(my_list);
    }
}

Now my question is how can i divide the list into two halves. or do i need to add one more list? or is there any way a list to be divided into two halves?

Answer 1

Override the ListFieldCallback.drawListRow() method to customise the way each row is painted.