Just a few notes on things I would change about the application if I had more time to reforactor:

• Seperate out the rather clunky "modes" in the activities into fragments to keep the code more readable. As it stands now, it's a little confusing.
• Major renaming of the "Groups," which are actually "Timelines."
• enum the statics from Constants into the classes they are most closely related to.
• Refactor the "select mode" to take advantage of the ActionBars select more.