AndroidX:Appcompat I:art error android.view.View$OnUnhandledKeyEventListener

In a newly created project with Androidx:appcompat:appcompat:1.0.0-rc01, I'm getting the

java.lang.ClassNotFoundException: Didn't find class 
"android.view.View$OnUnhandledKeyEventListener" on path: DexPathList

I had also added configuration.all

configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == "androidx.appcompat") {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion "1.+"
            }
        }
    }
}

This one is not affecting the app functionality or crashes. But it always have this error when the app is running. Kindly help me to solve the error. The entire stack trace is as follows.

I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
I/art:     at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
        at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
        at java.lang.Object java.lang.reflect.Constructor.newInstance0!(java.lang.Object[]) (Constructor.java:-2)
        at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:430)
        at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:645)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:787)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:727)
        at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:858)
        at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:821)
        at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:518)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:426)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:377)
        at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
        at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
        at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
        at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
        at void com.connectdb.truckish.common.base.BaseActivity.onCreate(android.os.Bundle) (BaseActivity.java:44)
        at void com.connectdb.truckish.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:14)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6672)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1140)
        at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2612)
        at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2724)
        at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
        at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1473)
        at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
        at void android.os.Looper.loop() (Looper.java:154)
        at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6123)
        at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
        at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:867)
        at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:757)
    Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.connectdb.truckish-2/base.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_dependencies_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_0_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_1_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_2_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_3_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_4_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_5_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_6_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_7_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_8_apk.apk", zip file "/data/app/com.connectdb.truckish-2/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[        at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:56)        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:380)        at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)        at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)        at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)        at java.lang.Object java.lang.reflect.Constructor.newInstance0!(java.lang.Object[]) (Constructor.java:-2)
        at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:430)
        at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:645)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:787)
        at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:727)
        at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:858)
        at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:821)
        at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:518)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:426)
        at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:377)
        at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
        at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
        at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
        at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
        at void com.connectdb.truckish.common.base.BaseActivity.onCreate(android.os.Bundle) (BaseActivity.java:44)
        at void com.connectdb.truckish.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:14)
        at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6672)
        at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1140)
        at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2612)
        at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2724)
        at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
        at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1473)
        at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
        at void android.os.Looper.loop() (Looper.java:154)
        at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6123)
        at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
        at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:867)
        at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:757)

As A.L.Flanagan mentioned in a comment the problem is that android.support.v4.view.ViewCompat does not implement View.OnUnhandledKeyEventListener in the new androidx package structure and only implements it starting on API 28 in the support lib structure (at least in version 28.0.0). Therefore the warning appears on devices with API <28 and does not appear on those >=28.

This is the related code in the ViewCompat.class class from the support package structure:

@RequiresApi(28)
private static class OnUnhandledKeyEventListenerWrapper implements OnUnhandledKeyEventListener {
    private ViewCompat.OnUnhandledKeyEventListenerCompat mCompatListener;

    OnUnhandledKeyEventListenerWrapper(ViewCompat.OnUnhandledKeyEventListenerCompat listener) {
        this.mCompatListener = listener;
    }

    public boolean onUnhandledKeyEvent(View v, KeyEvent event) {
        return this.mCompatListener.onUnhandledKeyEvent(v, event);
    }
}

I can not think about any easy fix to solve this warning.

I am facing same issue but just tried to upgrade dependency for appcompat and it worked no more error logs. I hope there will be new stable release soon. https://developer.android.com/jetpack/androidx/releases/appcompat#1.3.0-alpha02

implementation 'androidx.appcompat:appcompat:1.3.0-alpha02'

This is a bug in androidx. I've found the error causes lag in debug builds but doesn't show or slow down production builds. You can just ignore it for now.

you can use aspectJ to void this issue by modify androidx byte code.

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class UnHandleKeyEventAspectJ {
    public static final String TAG="UnHandleKeyEventAspectJ";
    @Pointcut("execution(* androidx.core.view.ViewCompat.setOnApplyWindowInsetsListener(android.view.View, androidx.core.view.OnApplyWindowInsetsListener))")
public void kotlinClassInit() {

}
    @Around("kotlinClassInit()")
    public void addTransaction(ProceedingJoinPoint joinPoint){
        try {
            joinPoint.proceed();
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
    }
}

The answers above are correct. The only way to avoid this is to remove references to AppCompat - e.g. I changed to FragmentActivity. The bad news is the new material libraries all reference and experience the problem. I didn't want this occurring on my startup - the hit is not so bad later on. It's only a warning - but does have a performance impact and it's pretty bogus and poorly handled by the big G.

The annotation @RequiresApi(28) actually means, that the only build.gradle configuration which would get one rid of the log-spam would be to raise the minSdkVersion to at least 28.

android {    
    defaultConfig {
        targetSdkVersion 28
        compileSdkVersion 28
        minSdkVersion 28
    }
}

From the bug-tracker:

> This bug is closed as Won't Fix (Intended Behavior), these errors can be ignored.

You can avoid it because that specific class only in Android 9.