Use the MIT AI2 Companion to help Develop your very own Android Applications using MIT App Inventor (Version 2, Beta). You can learn more at http://ai2.appinventor.mit.edu.
Note: If you are using MIT App Inventor version 1 (found at beta.appinventor.mit.edu) you should use the MIT AI Companion instead of this program. Both can be present on your phone at the same time.