Add an event to the Google Android calendar app by clicking the URL

Question

I want to create an event file (maybe isics file format?) On my website. When a user uses the phone to click this URL, he will launch the Google Android application for Google Android and automatically add it to the user's calendar. I create the ics file directly, but it does not work (shows the log "E / ICalProvider (xxx): Could not get the calendar from the ICal Uri file!") ... Does anyone know how to achieve this? thanks a lot!