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当我尝试使用 Android.Gms.Maps.Model.Marker 类实例化 Dictionary 时，我得到一个System.MissingMethodException如下所示：

Dictionary<Marker, MyInnerClass> _markers = new Dictionary<Marker, MyInnerClass>();

我怀疑以某种方式没有加载所需的 dll，但不知道为什么。该问题似乎特定于我的特定开发环境，因为具有相同代码的其他开发人员没有看到此问题。我可以在运行 Android 4.2.2 的 Genymotion、华硕平板电脑和 GS4 中重现该问题。

应用程序输出报告以下内容：

[] Missing method Android.Runtime.JNIEnv::AllocObject(Type) in assembly Mono.Android.dll, referenced in assembly GooglePlayServices.dll

这是堆栈跟踪：

System.MissingMethodException: Method not found: 'Android.Runtime.JNIEnv.AllocObject'.
at MyProduct.Maps.MyMapFragment..ctor () [0x00013] in /Users/me/code/my.domain/MyProduct/Maps/MyMapFragment.cs:48
at at (wrapper dynamic-method) object.ffa689fb-fdde-4e08-abd8-3bdf6ae641fb (intptr,object[]) <IL 0x00018, 0x00037>
at Java.Interop.TypeManager.n_Activate (intptr,intptr,intptr,intptr,intptr,intptr) [0x00070] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.2-branch/a25a31d0/source/monodroid/src/Mono.Android/src/Java.Interop/TypeManager.cs:141
at at (wrapper native-to-managed) Java.Interop.TypeManager.n_Activate (intptr,intptr,intptr,intptr,intptr,intptr) <IL 0x00020, 0x0007f>
at at (wrapper managed-to-native) object.wrapper_native_0xb65e0e20 (intptr,intptr,intptr,intptr,Android.Runtime.JValue[]) <0x00003>
at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (intptr,intptr,intptr,Android.Runtime.JValue[]) [0x00000] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.2-branch/a25a31d0/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:612
at Android.App.Activity.SetContentView (int) [0x00070] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.2-branch/a25a31d0/source/monodroid/src/Mono.Android/platforms/android-15/src/generated/Android.App.Activity.cs:3824
at MyProduct.MyListActivity.OnCreate (Android.OS.Bundle) [0x00079] in /Users/me/code/my.domain/MyProduct/MyListActivity.cs:83
at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (intptr,intptr,intptr) [0x00011] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.2-branch/a25a31d0/source/monodroid/src/Mono.Android/platforms/android-15/src/generated/Android.App.Activity.cs:1937
at at (wrapper dynamic-method) object.24a01956-09ee-4dec-9155-eff468f7249c (intptr,intptr,intptr) <IL 0x00017, 0x0001f>
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1 回答 1

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Android.Runtime.JNIEnv.AllocObject()是添加到 Xamarin.Android 4.10.1 的方法。

它似乎GooglePlayServices.dll是针对 4.10 构建的，而您的应用程序是针对 4.8（不包含AllocObject()）打包的。这将解释MissingMethodException.

Xamarin.Android 4.10.1 现已稳定；请升级。

于 2013-11-13T03:04:01.830 回答