title: Android Studio - app's changes reflect only after unistalling the app completely and installing again
body: <p>I developed an app using Android Studio and I have a problem with updates. Whether I install an updated version of APK at the debugging process, or I update the APK on Google Play Store, the changes aren't seen until I uninstall the app completely and reinstall it again.
  I don't know what can cause that situation, as I thought that changes apply through installing an updated APK on present one.</p>
  
  <p>I would appriciate any help
  Thank's</p>