title: How to verify whether my app is installed or not in other user's device in android?
body: <p>Iam doing Quiz application.In this application I would like to challenge a question to the users.For this, First of all I should verify whether my app is installed or not in other user's device whom i challenging the question.If app is installed I have to send a particular screen from my app.If app is not installed in user's device just send the playstore link.</p>
  
  <p>Is my requirement is possible to implement in android?</p>