How to use a notepad without listing notes in android?

How to use a notepad without listing notes in android?

I am looking for to create a notepad in android. But unlike other
available notepads for android, I want to create only one notepad with
only one text editing option. This notepad will have not title, just the
text editing section. Since there is only one note, there will be no list
of notes, and so there will be no ListActivity.
In the opening page, I want a button that will take the user to the note
editing page. This is the only way to view previously saved note as well
as adding/editing the note. There should be a save button which will
return to the opening page. No part of the original note will be displayed
in the opening page.
All the notepad samples use onListItemClick for editing notes. But since I
do not have more than one note, I do not have any list of notes, and so I
cannot use this.
I am new at android. Please help.
Thanks