I want my App users to enter a password before they could actually install my app,
I have searched on this topic,but didn't get relevant details. Any guidance will be helpful!
Thanks
depends on your way of distribution:
for example downloading the app of your repository: you can put you app in a rar with password, or you can put a dynamic download link that build this once you have entered the password.
Others solutions:
https://stackoverflow.com/a/8818011/4535278