title: Gradle files have changed since last project sync. A project sync may be necessary for the IDE to work properly
body: <p>I am just learning android programming , when I try to learn to make the project relating to the MySQL database , I get an error as shown.
  Can help me how to solve the error
  <img src="https://i.stack.imgur.com/imjKr.png" alt="Android Studio"></p>