title: Change Android default notification sound based on time
body: <p>I was wondering if it is possible to programmatically change the default notification sound on an Android phone based on what time it is.  For instance, I would like the default notification sound to change to Silent after 11PM and then back to a sound at 8AM.  I have a working knowledge of Java, but have never done any Android development.  Thanks in advance for any help. </p>