Android Studio unresolved reference. Project compiles

I had the same problem. It is related with new AndroidX libraries and migration on it.

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

I agree with Stanislav Mukhametshin that may be it is related with new AndroidX libraries and migration on it. I had cleaned and rebuilt project but that didn’t work. So, I tried this way and error goes away.

1) Go to File and close project.

2) Reopen the same project.

Simple Solution Is That:

1: GoTo File And Close The Project.

2: Then GoTo File And Click On “Open Recent” And Open Your Project.

That Trick Works For Me.

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