Step 2: Tap the "Settings" icon, then scroll down and select "Mail, Contacts, Calendars."
Step 5: Toggle your view of the subscribed calendar by opening the Calendar app and tapping "Calendars" in the upper left corner. Tap a calendar name to either display or remove calendar events.
Subscribing to a Google calendar on Android is actually a two-step process. You must first subscribe to the calendar using the web version of Google Calendar and then add it to your Android device.
Subscribing to ical on Google Calendar web:
Step 1: go to Google Calendar on the web
Step 2: Choose "Other calendars"
Step 3: In the dropdown menu, choose "Add by URL"
Step 4: Insert the calendar's ical address, click "Add Calendar," and you should be all set.