title: How can i make my outdated app version show a dialog that an update is available?
body: <p>I am just new to android programming, so let's say i have an app of version 1.0 .. then i released another version for the same app, let's say version 1.1 .. what code should i add in my app to check for updates and forces the outdated app versions to exit when a user does not update it and redirects the user to the download link if he/she wants to update my app ?. thanks</p>
  
  <p>in short, the outdated apps cannot be used because an alert dialog will appear that tells the user he must update my app to a newer version available</p>
  
  <p>PS, my app is not in the Play Store yet .. as i am a new android programmer and i have no 25$</p>