c# - Xamarin.Forms (droid build) MultiDex 选项导致应用程序崩溃

Question

我们的 Xamarin.Forms 项目已扩展到包括方法计数 >= 64k 的库，因此我们必须启用 MultiDex。 自启用它以来，机器人构建在部署到我的 Android 模拟器后立即崩溃。

我在网上搜索过，发现的唯一解决方案是卸载设备上的所有 xamarin.android 和 mono 运行时，我已经这样做了。这并没有解决它。

应用程序崩溃后，我的设备日志显示以下错误:

01-10 08:38:44.593 5" KitKat (4.4) XXHDPI Phone Error 1966 memtrack Couldn't load memtrack module (No such file or directory)
01-10 08:38:44.593 5" KitKat (4.4) XXHDPI Phone Error 1966 android.os.Debug failed to load memtrack module: -2
01-10 08:38:44.565 5" KitKat (4.4) XXHDPI Phone Error 1966 cutils-trace Error opening trace file: No such file or directory (2)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.app.ActivityThread.main(ActivityThread.java:5001)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime Caused by: java.lang.ClassNotFoundException: Didn't find class "md5ca27074e405277e6c40e6a6588077a84.MainApplication" on path: DexPathList[[zip file "/data/app/com.cii.patrollive-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.cii.patrollive-1, /system/lib]]
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.os.Looper.loop(Looper.java:136)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime ... 11 more
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.app.ActivityThread.access$1500(ActivityThread.java:135)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.app.LoadedApk.makeApplication(LoadedApk.java:507)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at java.lang.reflect.Method.invoke(Method.java:515)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.os.Handler.dispatchMessage(Handler.java:102)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.app.Instrumentation.newApplication(Instrumentation.java:975)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime Process: com.cii.patrollive, PID: 1948
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4301)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime java.lang.RuntimeException: Unable to instantiate application md5ca27074e405277e6c40e6a6588077a84.MainApplication: java.lang.ClassNotFoundException: Didn't find class "md5ca27074e405277e6c40e6a6588077a84.MainApplication" on path: DexPathList[[zip file "/data/app/com.cii.patrollive-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.cii.patrollive-1, /system/lib]]
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at java.lang.reflect.Method.invokeNative(Native Method)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime FATAL EXCEPTION: main
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at dalvik.system.NativeStart.main(Native Method)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at android.app.LoadedApk.makeApplication(LoadedApk.java:502)
01-10 08:38:39.201 5" KitKat (4.4) XXHDPI Phone Error 1948 AndroidRuntime at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
01-10 08:38:38.917 5" KitKat (4.4) XXHDPI Phone Error 1938 memtrack Couldn't load memtrack module (No such file or directory)
01-10 08:38:38.917 5" KitKat (4.4) XXHDPI Phone Error 1938 android.os.Debug failed to load memtrack module: -2
01-10 08:38:38.845 5" KitKat (4.4) XXHDPI Phone Error 1938 cutils-trace Error opening trace file: No such file or directory (2)
01-10 08:38:38.541 5" KitKat (4.4) XXHDPI Phone Error 1926 cutils-trace Error opening trace file: No such file or directory (2)
01-10 08:38:38.469 5" KitKat (4.4) XXHDPI Phone Error 1926 memtrack Couldn't load memtrack module (No such file or directory)
01-10 08:38:38.469 5" KitKat (4.4) XXHDPI Phone Error 1926 android.os.Debug failed to load memtrack module: -2
01-10 08:38:34.757 5" KitKat (4.4) XXHDPI Phone Error 1896 android.os.Debug failed to load memtrack module: -2
01-10 08:38:34.757 5" KitKat (4.4) XXHDPI Phone Error 1896 memtrack Couldn't load memtrack module (No such file or directory)
01-10 08:38:34.729 5" KitKat (4.4) XXHDPI Phone Error 1896 cutils-trace Error opening trace file: No such file or directory (2)
01-10 08:38:34.445 5" KitKat (4.4) XXHDPI Phone Error 1880 android.os.Debug failed to load memtrack module: -2
01-10 08:38:34.445 5" KitKat (4.4) XXHDPI Phone Error 1880 memtrack Couldn't load memtrack module (No such file or directory)
01-10 08:38:34.421 5" KitKat (4.4) XXHDPI Phone Error 1880 cutils-trace Error opening trace file: No such file or directory (2)
01-10 08:38:34.145 5" KitKat (4.4) XXHDPI Phone Error 1866 android.os.Debug failed to load memtrack module: -2
01-10 08:38:34.145 5" KitKat (4.4) XXHDPI Phone Error 1866 memtrack Couldn't load memtrack module (No such file or directory)
01-10 08:38:34.113 5" KitKat (4.4) XXHDPI Phone Error 1866 cutils-trace Error opening trace file: No such file or directory (2)

Answer 1

您的应用程序崩溃的原因可能有两个:

1. 您的 MainApplication 没有 ACW 名称，因此会为您生成一个。

Android Callable Wrappers will be based on the MD5SUM of the assembly-qualified name of the type being exported.

在您发布的示例中，我们看到了 md5ca27074e405277e6c40e6a6588077a84.MainApplication。因此，当我们在 dexlist 上查找 MainApplication 时，我们希望得到准确的名称。因此，将名称更改为更理想的名称(例如包名称)会有所帮助。

https://developer.xamarin.com/releases/android/xamarin.android_5/xamarin.android_5.1/#Android_Callable_Wrapper_Naming

1. MainApplication 类未放在主 classes.dex 列表中，因此在启动时，它会尝试查找该类但找不到，因为它在辅助列表中classes2.dex 文件。在初始化 Multidex 之前，不会加载辅助 .dex 文件。您可以在此处阅读有关 Multidex 的更多信息:

http://www.jon-douglas.com/2016/09/05/xamarin-android-multidex/

http://www.jon-douglas.com/2016/09/23/xamarin-android-multidex-keep/