Android Studio “cannot resolve symbol” but project compiles and works

Question

The project compiles fine. However, Android studio 3.0.1 shows reference to one particular library in red and displays \"cannot resolve symbol\". Even single stepping into

Answer 1

I Tried the following in order to resolve the issue:

1. Invalidated Caches/Restart
2. deleting .idea, .gredle under project and build under app
3. done clean project and rebuild project
4. deleted the caches in the installed path Eg. {installed path}.AndroidStudio4.0\system\caches
5. upgraded the studio to latest version [I have installed as suggested by windows, so its installed same path. I might have tried new path.]

Non of these tries helped to resolved this issue. Finaly I have tried these two steps:

1. commented dataBinding.enabled true from build.gredle of your app as its obsolete and replaced with buildFeatures{dataBinding true}.

2. Deleted the content of the log, tmp and caches folder from the installed path manually. Eg. {installed path}.AndroidStudio4.0\system\caches, {installed path}.AndroidStudio4.0\system\log, {installed path}.AndroidStudio4.0\system\log

3. Restarted the android studio

Now all reference for the Binding and other classes were restored.