Failed to find style 'coordinatorLayoutStyle' in current theme In Android Studio 3.1

This happened due to use of alpha version SDK 28

We need to change the android { ... } in "build.gradle" in app file
compileSdkVersion 28 to compileSdkVersion 27
targetSdkVersion 28 to targetSdkVersion 27

Also, try to change implementations like
implementation 'com.android.support:appcompat-v7:28.0.0-alpha3' to
implementation 'com.android.support:appcompat-v7:27.1.1'

Hope this works!

For Android Studio v3.1.*, in addition we need change:
implementation 'com.android.support:design:28.0.0-alpha3' to
implementation 'com.android.support:design:27.1.1'

you can fix this issue by adding this script to the app module build.gradle, in the android section

configurations.all {resolutionStrategy.eachDependency { DependencyResolveDetails details ->    def requested = details.requested    if (requested.group == "com.android.support") {        if (!requested.name.startsWith("multidex")) {            details.useVersion "27.+"        }     }   }}

This appears to be a bug in the current version of Android Studio (3.1.3) as I was encountering the same thing. I downloaded the beta build from here and opened my existing project and the errors disappeared.

https://developer.android.com/studio/preview/?utm_source=android-studio

Not exactly a fix but hopefully it will get you back up and running.