android externel application

Hi form the following site http://grepcode.com/snapshot/repository.grepcode.com/java/ext/com.google.android/android-apps/2.1_r2/

i can download the source code of all android app as jar ,i need the videorecording app from the above jar ,is it p开发者_StackOverflow中文版ossible ie by importing jar in to my app and call like default intent calling eg Intent i=new ... Startactivity().