Android Studio 3.1 does not render xml file due to a java class missing

Question

Always shows me the error in the massages

java.lang.ClassNotFoundException: android.view.View$OnUnhandledKeyEventListener

My pr

Answer 1

- Use Alpha/Beta at your Own Risk

• You are developing an app, so you don't want to face these types of issues. So I suggest you use always stable version of every dependency.

The issue you faced was due to using alpha version of AppCompat library. Use stable version to get rid of this issue now and in future.

1. Use android.support stable version

Currently 27.1.1 is latest version of AppComactV7. You can see Maven Repo link to find out latest.

final def SUPPORT_VERSION = "27.1.1"
implementation "com.android.support:appcompat-v7:$SUPPORT_VERSION"
implementation "com.android.support:design:$SUPPORT_VERSION" // use only if already using

I use definitions to have same version for all support versions. Also ignore design library if you are not already using it.

2. Downgrade compileSdkVersion and targetSdkVersion (Optional)

You also need to downgrade your compileSdkVersion & targetSdkVersion to remove some gradle warnings.

so use below versions

compileSdkVersion 27 
targetSdkVersion 27

Read about Alpha & Beta releases.