can't resolve AppCompatActivity

Question

After renaming application package name, Android Studio displayed this error can\'t resolve symbol AppCompatActivity

Things I tried: <

Answer 1

Go to your build.gradle file and in your dependencies find the appcompat one, something like compile 'com.android.support:appcompat-v7:25.X.X' Change it to compile 'com.android.support:appcompat-v7:25.3.+' Then click on Sync Now on the top right of the editor. Then go back to your build.gradle and change it back to whatever it was and click Sync Now This worked for me.