title: how to combine two android projects with a another screen
body: <p>i have two android projects 
   1. <strong>android 1</strong><br>
   2. <strong>android 2</strong>
  I want to design another project with two buttons. When i click 1st button it will start android 2, and when i press 2nd button it will start android 2.
  I want all these project as one Executable file.</p>