This should be a really simple question :)
I have a project that works fine. Now I wanted to rename it and to change the path of the projectfolder. First it seemd simple
For Android 3.3.2+
Be sure to select the folder with the project name
Uninstall the app from your device
Important!!
Turn off Instant Run to avoid the apk install process from looking for existing slices (the cache clean does not do this, apparently). This is from the SO answer here. File > Preferences > Build, Execution,Deployment > Instant Run > Uncheck the enabled box
Top menu bar -- File > Invalidate Caches / Restart (I invalidate only)
That should do the trick