android - 更新到支持工具 23 后再次出现 java.lang.NoClassDefFoundError : android. support.v7.internal.view.menu.i

Question

我实现了 https://code.google.com/p/android/issues/detail?id=78377 上列出的众多解决方案之一对于 4.2.2 手机的这个问题，但现在我已经更新到支持工具 23，这个问题又回来了。如果您查看该问题报告，您会发现自更新以来有很多人遇到同样的问题。 NoClassDefFoundError: android.support.v7.internal.view.menu.MenuBuilder上的解决方案也不起作用，因为它们来自 https://code.google.com/p/android/issues/detail?id=78377

这是我遇到的异常:

java.lang.NoClassDefFoundError: android.support.v7.internal.view.menu.i
       at android.support.v7.widget.ActionMenuView.getMenu(ActionMenuView.java:643)
       at android.support.v7.widget.Toolbar.ensureMenu(Toolbar.java:876)
       at android.support.v7.widget.Toolbar.getMenu(Toolbar.java:847)
       at android.support.v7.internal.widget.ToolbarWidgetWrapper.getMenu(ToolbarWidgetWrapper.java:702)
       at android.support.v7.internal.app.ToolbarActionBar.getMenu(ToolbarActionBar.java:583)
       at android.support.v7.internal.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:441)
       at android.support.v7.internal.app.ToolbarActionBar$1.run(ToolbarActionBar.java:65)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
       at android.view.Choreographer.doCallbacks(Choreographer.java:579)
       at android.view.Choreographer.doFrame(Choreographer.java:547)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
       at android.os.Handler.handleCallback(Handler.java:800)
       at android.os.Handler.dispatchMessage(Handler.java:100)
       at android.os.Looper.loop(Looper.java:194)
       at android.app.ActivityThread.main(ActivityThread.java:5391)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:525)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
       at dalvik.system.NativeStart.main(NativeStart.java)

我的混淆器有这个:

-keep class !android.support.v7.internal.view.menu.**,android.support.** {*;}

有什么解决办法吗？收到大量用户投诉。

Answer 1

您的 ProGuard“保持类”规则需要更新，因为目标类不再被混淆。在支持工具的第 23 版中，Google 将与菜单相关的类移出了内部包。我可以确认以下 ProGuard 规则消除了在某些运行 Android 4.2.2 的三星设备上出现的 NoClassDefFoundError。

# Workaround for conflict with certain OEM-modified versions of the Android appcompat
# support libs, especially Samsung + Android 4.2.2
# See this thread for more info:
#   https://code.google.com/p/android/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars&groupby=&sort=&id=78377
-keepattributes **
# Keep all classes except the ones indicated by the patterns preceded by an exclamation mark
-keep class !android.support.v7.view.menu.**,!android.support.design.internal.NavigationMenu,!android.support.design.internal.NavigationMenuPresenter,!android.support.design.internal.NavigationSubMenu,** {*;}
# Skip preverification
-dontpreverify
# Specifies not to optimize the input class files
-dontoptimize
# Specifies not to shrink the input class files
-dontshrink
# Specifies not to warn about unresolved references and other important problems at all
-dontwarn **
# Specifies not to print notes about potential mistakes or omissions in the configuration, such as
# typos in class names or missing options that might be useful
-dontnote **

我强烈建议您使用 dex2jar 和 jd 来确认所需的混淆已经发生(此处描述:https://stackoverflow.com/a/10191338/315702)。不幸的是，每次升级支持工具时都应该这样做，以防包被再次移动或重命名。

Google 将类从“内部”包中移出，希望这样可以避免导致 NoClassDefFoundError 的类路径冲突。然而，正如 Chris Banes 在该错误 ( https://code.google.com/p/android/issues/detail?id=78377 ) 的线程中所述，他们没有测试以验证修复——许多人已经报告了与您看到的相同的崩溃:

Right, we've decided to do a one-time rename of the internal classes which should fix this. I have done no testing on those devices though, and don't plan on doing any either.