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错误描述

使用androidx时，activity初始化时就报如下错误：

2019-03-05 16:24:58.278 28899-28899/? I/zygote: Rejecting re-init on previously-failed class java.lang.Class
   
    : java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at void androidx.core.view.ViewCompat.setOnApplyWindowInsetsListener(android.view.View, androidx.core.view.OnApplyWindowInsetsListener) (ViewCompat.java:2423)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:638)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:519)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:467)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:141)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at androidx.databinding.ViewDataBinding androidx.databinding.DataBindingUtil.setContentView(android.app.Activity, int, androidx.databinding.DataBindingComponent) (DataBindingUtil.java:303)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at androidx.databinding.ViewDataBinding androidx.databinding.DataBindingUtil.setContentView(android.app.Activity, int) (DataBindingUtil.java:284)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at void com.google.samples.apps.sunflower.GardenActivity.onCreate(android.os.Bundle) (GardenActivity.kt:41)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)2019-03-05 16:24:58.278 28899-28899/? I/zygote:     at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void android.os.Looper.loop() (Looper.java:164)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)2019-03-05 16:24:58.279 28899-28899/? I/zygote: Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.google.samples.apps.sunflower-GA9rYbqJxy2r-Lp_2xsaIA==/base.apk"],nativeLibraryDirectories=[/data/app/com.google.samples.apps.sunflower-GA9rYbqJxy2r-Lp_2xsaIA==/lib/x86, /system/lib, /vendor/lib]]2019-03-05 16:24:58.279 28899-28899/? I/zygote:     at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:93)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:379)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at void androidx.core.view.ViewCompat.setOnApplyWindowInsetsListener(android.view.View, androidx.core.view.OnApplyWindowInsetsListener) (ViewCompat.java:2423)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:638)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:519)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:467)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:141)2019-03-05 16:24:58.280 28899-28899/? I/zygote:     at androidx.databinding.ViewDataBinding androidx.databinding.DataBindingUtil.setContentView(android.app.Activity, int, androidx.databinding.DataBindingComponent) (DataBindingUtil.java:303)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at androidx.databinding.ViewDataBinding androidx.databinding.DataBindingUtil.setContentView(android.app.Activity, int) (DataBindingUtil.java:284)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void com.google.samples.apps.sunflower.GardenActivity.onCreate(android.os.Bundle) (GardenActivity.kt:41)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.os.Looper.loop() (Looper.java:164)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)2019-03-05 16:24:58.281 28899-28899/? I/zygote:     at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)2019-03-05 16:24:58.282 28899-28899/? I/zygote:     at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
   

分析

经过仔细确认，发现在API 28（安卓9.0）无此问题，低于此版本的都有问题。

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