[android-studio] Android Studio - Auto complete and other features not working

Just remove all the folders named AndroidStudioPreview

On Windows:

Go to your User Folder - on Windows 7/8 this would be:

[SYSDRIVE]:\Users[your username] (ex. C:\Users\JohnDoe)

In this folder there should be a folder called .AndroidStudioPreview

On Mac OS X

Remove these files:

~/Library/Application Support/AndroidStudioPreview ~/Library/Caches/AndroidStudioPreview ~/Library/Logs/AndroidStudioPreview ~/Library/Preferences/AndroidStudioPreview