Android Studio 3.1 Cannot Resolve Symbol (Themes, Widget, Attr, etc.)

Android Studio 3.1 Cannot Resolve Symbol (Themes, Widget, attr, etc.)

Close the project and import it again. Worked for me today.

In android studio 3.1 stable gives error on Theme and ?attr/actionBarSize attribute?

close project -> import gradle project.

It's a stupid solution but somehow worked for me.

It's solution from other question btw, but i can't find it right now, Ill update if i find it.

Update
found it:
Original issue with this solution

Update 2
It addresses only issue with ?attr/actionBarSize

Android Studio: Unresolved symbol Theme in styles.xml

Did you try to update the compileSDK Version? According to this post the reason can be both in the compileSDK or that the library is out of sync, or even you have to cancel .idea, or the google repository that is not set.

Cannot resolve symbol '?attr/actionBarSize' after updating Android Studio from 2.3 to 3.0 for buildToolsVersion '26.0.2'

Nothing helped, but changing:

?attr/actionBarSize to ?android:attr/actionBarSize did the job.

That's actually a bug in few versions. Even if you won't fix it, Android will automatically fix it at runtime.

Cannot resolve symbol 'Theme' Validates resource references inside Android XML files

Close the project from the File menu and open the project again as existing Android Studio project. This worked for me.

android studio 3.1 always getting error about unable to resolve dependency

Failed to resolve: com.github.florent37:android-slidr:1.0.4

Make sure you added below in your Project Level build.gradle section.

 allprojects {
    repositories {
      .........
        maven {
            url  "http://dl.bintray.com/florent37/maven"
        }
    }

FYI

If same problem coming, You can use OLD version

compile 'com.github.florent37:android-slidr:1.0.3'

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