Question

Plz brifly explain the meaning of ….

First i create a CustomButtonField class, and then i found out that if i din’t write the

public boolean isFocusable() 
{
  return true;
}

function, it doesnot responds to user events like mouse click….

and also plz explain briefly the meaning of the following functions

protected boolean navigationClick(int status, int time)
{  
    fieldChangeNotify(0);
    return true;
}


protected boolean keyChar(char character, int status, int time) 
{
    if (character == Keypad.KEY_ENTER) 
    {
      fieldChangeNotify(0);
      return true;
    }
    return super.keyChar(character, status, time);
}

Answer 1

If you want a field to behave like a button

• you must set Field.FOCUSABLE style bit.

• setChangeListener to CustomButtonField.

  protected boolean navigationClick(int status, int time) {
      fieldChangeNotify(0);
      return true;
  }
  

  if user clicks on this button, we can see that button has changed (fieldChangeNotify(0);)
  and listener of the button works.

  protected boolean keyChar(char character, int status, int time) 
  {
      if (character == Keypad.KEY_ENTER) 
      {
        fieldChangeNotify(0);
        return true;
      }
      return super.keyChar(character, status, time);
  }
  

by this method if ‘Enter key’ pressed, button says i am changed.(fieldChangeNotify(0);)