Question

我们的Xamarin.Forms项目已经扩展到包含方法计数＆gt; = 64k的库，因此我们必须启用MultiDex。自启用它以来，droid构建在部署到我的android模拟器后立即崩溃。

我搜索了网络，我找到的唯一解决方案是卸载设备上的所有xamarin.android和单一运行时，我已经完成了。这并没有解决它。

我的设备日志在应用崩溃后显示以下错误：

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是双重的：

您的MainApplication没有ACW名称，因此会为您生成一个。

Android Callable Wrappers将基于正在导出类型的程序集限定名称的MD5SUM。

在您发布的示例中，我们看到md5ca27074e405277e6c40e6a6588077a84.MainApplication。因此，当我们在MainApplication上查找dexlist时，我们希望得到确切的名称。因此，将名称更改为更合理的名称（如包名称）有助于此处。

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

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无法找到它，因为它位于辅助classes2.dex中文件。在.dex初始化之前，不会加载辅助Multidex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/

Answer 2

我发现了一个解决方案。在droid项目的MainActivity上指定Name属性解决了这个问题。（我之前没有指定名字）。（还需要清洁和重建）

我不知道为什么你需要在添加MultiDex选项后指定活动名称，我猜这是一个Xamarin错误。

[Activity(    ...    , Name= "com.cii.patrolliveapp",    ...    ]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    ...
}

编辑：在另一个答案中，Jon还向我指出了第二个问题。这是Windows上的android sdk上的第一个dex类列表为空的错误。

修复方法是打开android-sdk\build-tools\<version>\mainDexClasses.bat文件（版本是您安装的最高版本，这是默认版本）并更改：

if DEFINED output goto redirect  
call "%java_exe%" -Djava.ext.dirs="%frameworkdir%" com.android.multidex.MainDexListBuilder "%disableKeepAnnotated%" "%tmpJar%" "%params%"  
goto afterClassReferenceListBuilder  
:redirect
call "%java_exe%" -Djava.ext.dirs="%frameworkdir%" com.android.multidex.MainDexListBuilder "%disableKeepAnnotated%" "%tmpJar%" "%params%" 1>"%output%"  
:afterClassReferenceListBuilder

到此：

SET params=%params:'=%  
if DEFINED output goto redirect  
call "%java_exe%" -Djava.ext.dirs="%frameworkdir%" com.android.multidex.MainDexListBuilder %disableKeepAnnotated% "%tmpJar%" %params%  
goto afterClassReferenceListBuilder  
:redirect
call "%java_exe%" -Djava.ext.dirs="%frameworkdir%" com.android.multidex.MainDexListBuilder %disableKeepAnnotated% "%tmpJar%" %params% 1>"%output%"  
:afterClassReferenceListBuilder

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

2 个答案: