title: Determine application version
body: <p>I wanna know if there is anyway to determine <strong>not through the packages, but through applications</strong> the version of an application which isnt the current application.</p>
  
  <p>let's say right now i am in the scope of app A. and i wanna run an activity from app B. i wanna check before the version code of app B.</p>
  
  <p>thanks,</p>
  
  <p>ray.</p>