SQL Injection Vulnerability security alert in Play Console

I received this warning on my published app in Play Console:

Your app contains a SQL Injection Vulnerability. Please see this Google Help Center article for details.
https://support.google.com/faqs/answer/7668308

Vulnerable classes:
Lcom/tyczj/extendedcalendarview/CalendarProvider;->query
Please fix the issue before: 09/16/2018