cannot resolve android symbol - android app - intelliJ

Question

I am using intellij-idea to develop android app. I created a project with an android module, but none of these :

import android.app.Activity;
import android         


        

Answer 1

i have the answer guys
1- press ctrl+alt+shift+s
2-in the Modules bar click on your project name
3-change the compile sdk version to the newest one
4-click apply and ok then sync your project
5-done , i hope the best for you