title: Installation via android studio works but manual apk installation doesn't
body: <p>i have a problem with installing my app via APK.
  The app works fine on multiple devices when i install it with Android studio,
  or when i run it via emulator, but when i generate APK file, put it in my phone
  and try to manually install it, main activity gets opened and when i click any 
  button it just crashes.</p>