Android Studio cannot resolve symbol but code executes correctly

Question

I have recently created a library Jar file that I imported in my Android project. I am able to call functions and use classes that are present in this Jar file, but Android

Answer 1

For me worked only

File -> Open -> and click build.gradle to reopen project

Answer 2

I have faced this issue when IntelliJ IDEA got closed abruptly due to OS crash.

You can do "File" -> "Invalidate Caches...", and select "Invalidate and Restart" option to fix this.

Answer 3

Changing the language injection settings worked for me.

Place the cursor on any of the red underlined code and Alt + Enter

Now select Language Injection Settings and a window will open as shown below.

Make sure you have the right file type selected in ID: field and Uncheck the options related to your error codes and click Ok

Hope this helps somebody.