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

Question

The Android Studio 3.1 layout preview fails to find style \'coordinatorLayoutStyle\' in the current theme.

Failed to instantiated one or more classes.
 Excep         


        

Answer 1

Update

1. com.android.support:appcompat stable version 28.0.0 is released. So no need to downgrade version. Just use 28.0.0.

def supportVersion = "28.0.0"
implementation "com.android.support:appcompat-v7:$supportVersion"
implementation "com.android.support:design:$supportVersion"

You can ignore design library if you don't need it.

2: You also need to update your compileSdkVersion & targetSdkVersion to remove some gradle warnings.

compileSdkVersion 28
targetSdkVersion 28

Never use alpha versions of any library, because alpha, beta and rc versions may have bugs. And you don't want to face these types of errors often.

Important Suggestion

I suggest you migrate to androidx because android will not update support library after 28.0.0, all updates will be available to androidx package only. Check related answer.