Android Studio and android.support.v4.app.Fragment: cannot resolve symbol

Question

I am tryng out Android Studio instead of Eclipse. I install it and then start a completely new project and follow the wizard. I add no code of my own.

Then, I right-

Answer 1

Do sth. modification (just to gradle sync) over app level build.gradle and sync. Again, redo what you changed in build.gradle and sync. It should fix your problem.

Answer 2

I encountered this issue and tried everything including File > Invalidate Caches but nothing worked. The reason this issue was happening for me was because I had external projects that were using a different AppCompat version to my main gradle file.

After I updated all gradle files to be the same version the compile error went away.

Answer 3

File -> "Invalidate caches/Restart" This worked for me.

Answer 4

I'm using buck and it seems like by removing the /.idea/libraries in your project folder and sync gradle again works for me.