Android 7.0中的android.webkit.WebViewFactory$MissingWebViewPackageException

Question

以下崩溃偶尔（很少）报告，仅来自Android 7.0设备：

android.util.AndroidRuntimeException: 
  at android.webkit.WebViewFactory.getProviderClass (WebViewFactory.java:371)
  at android.webkit.WebViewFactory.getProvider (WebViewFactory.java:194)
  at android.webkit.WebViewDatabase.getInstance (WebViewDatabase.java:38)
  at com.amazon.device.ads.AdLayout.isWebViewDatabaseNull (SourceFile:352)
  at com.amazon.device.ads.AdLayout.initializeIfNecessary (SourceFile:260)
  at com.amazon.device.ads.AdLayout.getAdController (SourceFile:303)
  at com.amazon.device.ads.AdLayout.onLayout (SourceFile:478)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.RelativeLayout.onLayout (RelativeLayout.java:1189)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.RelativeLayout.onLayout (RelativeLayout.java:1189)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1982)
  at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1826)
  at android.widget.LinearLayout.onLayout (LinearLayout.java:1735)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:383)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:321)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:383)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:321)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1982)
  at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1826)
  at android.widget.LinearLayout.onLayout (LinearLayout.java:1735)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:383)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:321)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1982)
  at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1826)
  at android.widget.LinearLayout.onLayout (LinearLayout.java:1735)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.widget.FrameLayout.layoutChildren (FrameLayout.java:383)
  at android.widget.FrameLayout.onLayout (FrameLayout.java:321)
  at com.android.internal.policy.DecorView.onLayout (DecorView.java:751)
  at android.view.View.layout (View.java:17838)
  at android.view.ViewGroup.layout (ViewGroup.java:5754)
  at android.view.ViewRootImpl.performLayout (ViewRootImpl.java:2698)
  at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2371)
  at android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1462)
  at android.view.ViewRootImpl$TraversalRunnable.run (ViewRootImpl.java:6960)
  at android.view.Choreographer$CallbackRecord.run (Choreographer.java:907)
  at android.view.Choreographer.doCallbacks (Choreographer.java:709)
  at android.view.Choreographer.doFrame (Choreographer.java:644)
  at android.view.Choreographer$FrameDisplayEventReceiver.run (Choreographer.java:893)
  at android.os.Handler.handleCallback (Handler.java:836)
  at android.os.Handler.dispatchMessage (Handler.java:103)
  at android.os.Looper.loop (Looper.java:208)
  at android.app.ActivityThread.main (ActivityThread.java:6267)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1063)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:924)
Caused by: android.webkit.WebViewFactory$MissingWebViewPackageException: 
  at android.webkit.WebViewFactory.getWebViewContextAndSetProvider (WebViewFactory.java:270)
  at android.webkit.WebViewFactory.getProviderClass (WebViewFactory.java:330)

堆栈跟踪中没有包含任何与应用程序相关的内容，因此我不知道在哪里查找。有谁能够帮忙解决这个问题吗？如何预防这种情况发生？

- Hong

Answer 1

这是因为在您尝试在应用程序中使用Webview时，Webview会同时通过Google Play进行更新。

更多信息请参见： https://bugs.chromium.org/p/chromium/issues/detail?id=506369

- Magnus

---

不是建议（因为你将会捕获运行时异常）：我猜你应该能够捕获MissingWebViewPackageException并显示一个进度条，然后每秒轮询你尝试使用的组件，当异常不再发生时，你就可以安全地使用webview了。但这似乎是亚马逊的广告包表现不佳？ - Magnus

谢谢。由于亚马逊广告导致各种崩溃和ANR，我已经将其禁用。这只是其中之一。 - Hong

它会因为在onCreate()之上被声明为类对象而崩溃，还是只有在实际使用时才会崩溃？ - isJulian00

Answer 2

检查您是否安装了包com.google.android.webview并且它是否处于活动状态。

有可能为了“去除手机垃圾”，您禁用了它，例如通过pm disable com.google.android.webview（如果已获取root权限）或pm disable-user --user 0 com.google.android.webview（如果未获取root权限）。

可以通过设置>应用程序（显示系统应用程序）>Android系统WebView>启用或通过终端（需要在设置中启用adb调试）重新启用它：

pm enable com.google.android.webview

如果WebView已启用，请尝试“设置>应用程序”中的“卸载更新”选项 - 有时系统升级或通过Google Play的升级可能会安装有缺陷的WebView版本。

另一个选择是访问 https://play.google.com/store/apps/details?id=com.google.android.webview 并安装可用的更新。如果它不能解决错误，则卸载它，以便您的设备返回到随机ROM提供的原始系统WebView。

- ccpizza

Answer 3

手动更新Chrome可能会导致此问题。 我们的模拟器运行的是非Play版本的安卓系统，所以我们不得不使用APK文件手动更新Chrome以完成其他任务。可能选择了错误的文件。任何使用WebView的应用都会崩溃，包括其自身的应用程序。

移除Chrome的更新后，WebView又可以正常工作了。

- Mike Game Dev