title: How to check some dependency before installation of an application in Android
body: <p>I make two android application first one is installer app that download and install my application.</p>
  
  <p>Now i just want to make second application that would not be install from outside installer, means before installing second application it will check that first app is installed or not, if first application is not install it will recommend that it is necessary to install first application before second application.</p>
  
  <p>Please give me suggestion i am new on android</p>
  
  <p>Thanks </p>