A warning to Memento users:
Memento might lose the contents of your notes if they are not saved directly by pressing the back button.
If you type some very important information and just leave the application in the background (like I did yesterday) Android will clear the memory of the application and your note is gone!
I think this is because Memento does not work correctly with the android activity life cycle.
I could not find a bug tracker for the project to report this as a bug, so I leave it here as a warning to anyone using this application.