xamarin.forms中的DefaultRenderer错误(Android)

Question

我正在使用xamarin表单...有时当我尝试回到我的上一页时,我看到了这个(Android设备):

System.NotSupportedException:无法从本机句柄0xbeb4a30c激活Xamarin.Forms.Platform.Android.Platform + DefaultRenderer类型的实例

我在标签渲染器和框渲染器中看到了同样的问题,但我解决了在自定义渲染器中创建构造函数的问题,因为下链接建议:

MonoDroid:调用自定义视图的构造函数时出错 - TwoDScrollView

但是没有关于DefaultRenderer错误的信息,就像我过去30天搜索过的所有内容一样......我疯了......

完全例外:

System.NotSupportedException:无法从本机句柄0xbecdf3ac(key_handle 0x24da7695)激活Xamarin.Forms.Platform.Android.Platform + DefaultRenderer类型的实例.

04-04 11:51:53.914 D/Mono(30832):DllImport尝试加载:'/ system/lib/liblog.so'.04-04 11:51:53.914 D/Mono(30832):DllImport加载库'/system/lib/liblog.so'.04-04 11:51:53.914 D/Mono(30832):DllImport搜索:'/ system/lib/liblog.so'('/ system/lib/liblog.so').04-04 11:51:53.914 D/Mono(30832):搜索'__android_log_print'.04-04 11:51:53.914 D/Mono(30832):探测'__android_log_print'.04-04 11:51:53.914 D/Mono(30832):找到'__android_log_print'.04-04 11:51:53.924 I/MonoDroid(30832):UNHANDLED EXCEPTION:04-04 11:51:53.944 I/MonoDroid(30832):System.NotSupportedException:无法激活Xamarin.Forms.Platform.Android类型的实例.Platform + DefaultRenderer来自本机句柄0xbecdf3ac(key_handle 0x24da7695).---> System.MissingMethodException:找不到Xamarin.Forms.Platform.Android.Platform + DefaultRenderer ::.ctor(System.IntPtr,Android.Runtime.JniHandleOwnership)---> Java.Interop.JavaLocationException的异常:类型'Java.Interop.JavaLocationException'被抛出.04-04 11:51:53.944 I/MonoDroid(30832):---内部异常堆栈跟踪结束--- 04-04 11:51:53.944 I/MonoDroid(30832):at Java.Interop.TypeManager.CreateProxy (System.Type类型,System.IntPtr句柄,Android.Runtime.JniHandleOwnership传输)[0x00054] in:0 04-04 11:51:53.944 I/MonoDroid(30832):at Java.Interop.TypeManager.CreateInstance(System. IntPtr句柄,Android.Runtime.JniHandleOwnership transfer,System.Type targetType)[0x00111] in:0 04-04 11:51:53.944 I/MonoDroid(30832):---内部异常堆栈跟踪结束--- 04- 04 11:51:53.944 I/MonoDroid(30832):at Java.Interop.TypeManager.CreateInstance(System.IntPtr handle,Android.Runtime.JniHandleOwnership transfer,System.Type targetType)[0x0017d] in:0 04-04 11: 51:53.944 I/MonoDroid(30832):在Java.Lang.Object.GetObject(System.IntPtr句柄,Android.Runtime.JniHandleOwnership transfer,System.Type类型)[0x000b9]中:0 04-04 11:51:53.944 I/MonoDroid(30832):在Java.Lang.Object._GetObject [T](System.IntPtr句柄,Android.Runtime.JniHandleOwnership transfer)[0x00017] in:0 04-04 11:51:53.944 I/MonoDroid(30832):at Java.Lang.Object.GetObject [T](System.IntPtr handle,Android.Runtime.JniHandleOwnership transfer) [0x00000] in:0 04-04 11:51:53.944 I/MonoDroid(30832):at Java.Lang.Object.GetObject [T](System.IntPtr jnienv,System.IntPtr handle,Android.Runtime.JniHandleOwnership transfer) [0x00006] in:0 04-04 11:51:53.944 I/MonoDroid(30832):在Android.Views.View.n_DispatchTouchEvent_Landroid_view_MotionEvent_(System.IntPtr jnienv,System.IntPtr native__this,System.IntPtr native_e)[0x00000]中: 0 04-04 11:51:53.944 I/MonoDroid(30832):at(包装器动态方法)System.Object:cce836e4-e6e4-4d51-a0da-36412953d80b(intptr,intptr,intptr)04-04 11:51: 53.964 W/art(30832):JNI RegisterNativeMethods:尝试为android.runtime.JavaProxyThrowable注册0本机方法04-04 11:51:53.964 D/Mono(30832):DllImport搜索:'__ Internal'('(null) ").04-04 11:51:53.964 D/Mono(30832):搜索'java_interop_jnienv_throw'.04-04 11:51:53.964 D/Mono(30832):探测'java_interop_jnienv_throw'.04-04 11:51:53.964 D/Mono(30832):找到'java_interop_jnienv_throw'.未处理的异常:

System.NotSupportedException:无法从本机句柄0xbecdf3ac(key_handle 0x24da7695)激活Xamarin.Forms.Platform.Android.Platform + DefaultRenderer类型的实例.

04-04 11:51:57.014 I/art(30832):线程[2,tid = 30839,WaitingInMainSignalCatcherLoop,Thread*= 0xaf90e400,peer = 0x12c4d080,"Signal Catcher"]:对信号做出反应3 04-04 11:51 :57.584 I/art(30832):将堆栈跟踪写入'/data/anr/traces.txt'04-04 11:52:07.844 I/MonoDroid(30832):UNHANDLED EXCEPTION:04-04 11:52:07.894 I/MonoDroid(30832):System.NotSupportedException:无法从本机句柄0xbecdf3ac(key_handle 0x24da7695)激活Xamarin.Forms.Platform.Android.Platform + DefaultRenderer类型的实例.---> System.MissingMethodException:找不到Xamarin.Forms.Platform.Android.Platform + DefaultRenderer ::.ctor(System.IntPtr,Android.Runtime.JniHandleOwnership)---> Java.Interop.JavaLocationException的异常:类型'Java.Interop.JavaLocationException'被抛出.04-04 11:52:07.894 I/MonoDroid(30832):---内部异常堆栈跟踪结束--- 04-04 11:52:07.894 I/MonoDroid(30832):at Java.Interop.TypeManager.CreateProxy (System.Type类型,System.IntPtr句柄,Android.Runtime.JniHandleOwnership transfer)[0x00054] in:0 04-04 11:52:07.894 I/MonoDroid(30832):at Java.Interop.TypeManager.CreateInstance(System. IntPtr句柄,Android.Runtime.JniHandleOwnership transfer,System.Type targetType)[0x00111] in:0 04-04 11:52:07.894 I/MonoDroid(30832):---内部异常堆栈跟踪结束--- 04- 04 11:52:07.894 I/MonoDroid(30832):at(包装器动态方法)System.Object:cce836e4-e6e4-4d51-a0da-36412953d80b(intptr,intptr,intptr)04-04 11:52:07.894 I/MonoDroid(30832):at(包装器托管到本机)Java.Interop.NativeMethods:java_interop_jnienv_call_nonvirtual_void_method_a(intptr,intptr&,intptr,intptr,intptr,Java.Interop.JniArgumentValue*)04-04 11:52:07.894 I/MonoDroid (30832):at Java.Interop.JniEnvironment + InstanceMethods.CallNonvirtualVoidMeth od(Java.Interop.JniObjectReference实例,Java.Interop.JniObjectReference类型,Java.Interop.JniMethodInfo方法,Java.Interop.JniArgumentValue*args)[0x00073] in:0 04-04 11:52:07.894 I/MonoDroid(30832) ):at Java.Interop.JniPeerMembers + JniInstanceMethods.InvokeVirtualVoidMethod(System.String encodedMember,Java.Interop.IJavaPeerable self,Java.Interop.JniArgumentValue*parameters)[0x0005d] in:0 04-04 11:52:07.894 I/MonoDroid (30832):在Android.Views.ViewGroup.RemoveAllViews()[0x0000a] in:0 04-04 11:52:07.894 I/MonoDroid(30832):at Xamarin.Forms.Platform.Android.VisualElementRenderer 1[TElement].Dispose (System.Boolean disposing) [0x00088] in D:\agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:238 04-04 11:52:07.894 I/MonoDroid(30832): at Java.Lang.Object.Dispose () [0x00000] in <e79c73bcbbb547688bef6c7e9665c95e>:0 04-04 11:52:07.894 I/MonoDroid(30832): at Xamarin.Forms.Platform.Android.ListViewRenderer.ClearRenderer (Android.Views.View renderedView) [0x00032] in D:\agent_work\1\s\Xamarin.Forms.Platform.Android\Renderers\ListViewRenderer.cs:295 04-04 11:52:07.894 I/MonoDroid(30832): at Xamarin.Forms.Platform.Android.ListViewRenderer.Dispose (System.Boolean disposing) [0x0001e] in D:\agent_work\1\s\Xamarin.Forms.Platform.Android\Renderers\ListViewRenderer.cs:59 04-04 11:52:07.894 I/MonoDroid(30832): at Java.Lang.Object.Dispose () [0x00000] in <e79c73bcbbb547688bef6c7e9665c95e>:0 04-04 11:52:07.894 I/MonoDroid(30832): at Xamarin.Forms.Platform.Android.VisualElementRenderer1 [TElement]. Dispose(System.Boolean disposing)[0x0007b]在D:\ agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:234 04-04 11:52:07.894 I/MonoDroid(30832):at Java .Lang.Object.Dispose()[0x00000] in:0 04-04 11:52:07.894 I/MonoDroid(30832):at Xamarin.Forms.Platform.Android.VisualElementRenderer`1 [TElement] .Dispose(System.Boolean在D:\ agent_work\1\s\X中处理)[0x0007b] amarin.Forms.Platform.Android\VisualElementRenderer.cs:234 04-04 11:52:07.894 I/MonoDroid(30832):在Xamarin.Forms.Platform.Android.PageRenderer.Dispose(System.Boolean disposing)[0x00011] in D:\ agent_work\1\s\Xamarin.Forms.Platform.Android\Renderers\PageRenderer.cs:33 04-04 11:52:07.894 I/MonoDroid(30832):at Java.Lang.Object.Dispose()[ 0x00000] in:0 04-04 11:52:07.894 I/MonoDroid(30832):D:\ agent_work\1\s\Xamarin中的Xamarin.Forms.Platform.Android.AppCompat.FragmentContainer.OnDestroyView()[0x0003c] .Forms.Platform.Android\AppCompat\FragmentContainer.cs:91 04-04 11:52:07.894 I/MonoDroid(30832):at Android.Support.V4.App.Fragment.n_OnDestroyView(System.IntPtr jnienv,System.IntPtr native__this)[0x00008] in <1e89c43d3c7d48b5ba69bfc0b1bdf114>:0 04-04 11:52:07.894 I/MonoDroid(30832):at(wrapper dynamic-method)System.Object:1df32498-cacf-4686-8c6a-cd4a5d878faf(intptr,intptr )04-04 11:52:07.914 E/mono-rt(30832):Stacktrace:04-04 11:52:07.914 E/mono-rt(30832):04-04 11:52:07.9 14 E/mono-rt(30832):at <0xffffffff> 04-04 11:52:07.914 E/mono-rt(30832):at(包装器托管到原生)Java.Interop.NativeMethods.java_interop_jnienv_new_string(intptr, intptr&,char*,int)<0x00043> 04-04 11:52:07.914 E/mono-rt(30832):at Java.Interop.JniEnvironment/Strings.NewString(char*,int)[0x00009] in:0 04 -04 11:52:07.924 E/mono-rt(30832):at Java.Interop.JniEnvironment/Strings.NewString(string)[0x00024] in:0 04-04 11:52:07.924 E/mono-rt(30832) ):在Android.Runtime.JNIEnv.NewString(string)[0x0000a] in:0 04-04 11:52:07.924 E/mono-rt(30832):at Java.Lang.Error..ctor(string)[0x00020 ] in:0 04-04 11:52:07.924 E/mono-rt(30832):在Android.Runtime.JavaProxyThrowable..ctor(System.Exception)[0x00007] in:0 04-04 11:52:07.924 E/mono-rt(30832):at Java.Lang.Throwable.FromException(System.Exception)[0x0001e] in:0 04-04 11:52:07.924 E/mono-rt(30832):at Android.Runtime.AndroidEnvironment .UnhandledException(System.Exception)[0x00068] in:0 04-04 11:52:07.924 E/mono-r t(30832):at(wrapper dynamic-method)object.1df32498-cacf-4686-8c6a-cd4a5d878faf(intptr,intptr)[0x00029] in <657aa8fea4454dc898a9e5f379c58734>:0 04-04 11:52:07.924 E/mono-rt (30832):at(包装器本机到托管)object.1df32498-cacf-4686-8c6a-cd4a5d878faf(intptr,intptr)[0x00021] in <657aa8fea4454dc898a9e5f379c58734>:0 04-04 11:52:07.924 E/mono- rt(30832):/ proc/self/maps:

Answer 1

这应该通过使用旧的 JNI 构造函数和遗留渲染器来解决

public MyLabelRenderer(IntPtr handle, JniHandleOwnership transfer)
{
}

并通过设置 UseLegacyRenderers 标志MainActivity

Forms.SetFlags("UseLegacyRenderers");