应用程序恢复导致 FormsAppCompatActivity 崩溃 [英] App resuming results in crash with FormsAppCompatActivity

查看：25
本文介绍了应用程序恢复导致 FormsAppCompatActivity 崩溃的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个 Xamarin Forms 应用，目前正在为 Android 构建.我有一个 MainActivity 用于扩展 FormsApplicationActivity，但是因为我想使用自定义主题，所以我不得不更改它以扩展 FormsAppCompatActivity(请参阅我的另一个问题:Xamarin Forms 自定义主题不起作用).

I have a Xamarin Forms app, currently being built for Android. I have a MainActivity that used to extend FormsApplicationActivity, but because I want to use a custom theme I had to change it to extend FormsAppCompatActivity (see my other question: Xamarin Forms custom theme not working).

自从从 FormsApplicationActivity 更改为 FormsAppCompatActivity 后，每当我切换出应用程序然后再切换回应用程序时，应用程序就会崩溃.它在 OnResume 方法的 App.xaml.cs 类中引发错误，我尝试将 MainPage 设置为新的导航页面:

Ever since changing from FormsApplicationActivity to FormsAppCompatActivity the app crashes whenever I switch out of the app and then back into the app. It throws an error in the App.xaml.cs class in the OnResume method, where I try to set the MainPage to a new navigation page:

protected override void OnResume()
{
    bool isRegistered = _authenticationService.IsRegistered();

    MainPage = isRegistered 
        ? new NavigationPage(new LoginPage()) 
        : new NavigationPage(new RegisterPage()); // this results in the crash
}

我得到的错误是:

Java.Lang.IllegalStateException: 之后无法执行此操作onSaveInstanceState

Java.Lang.IllegalStateException: Can not perform this action after onSaveInstanceState

这是堆栈跟踪:

03-09 13:43:52.098 I/MonoDroid( 1243): Java.Lang.IllegalStateException: Can not perform this action after onSaveInstanceState
03-09 13:43:52.098 I/MonoDroid( 1243):   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Android.Runtime.JNIEnv.CallIntMethod (IntPtr jobject, IntPtr jmethod) [0x00063] in /Users/builder/data/lanes/2098/3efa14c4/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:386 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Android.Support.V4.App.FragmentTransactionInvoker.Commit () [0x00033] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.AppCompat.NavigationPageRenderer.SwitchContentAsync (Xamarin.Forms.Page view, Boolean animated, Boolean removed, Boolean popToRoot) [0x000e1] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.AppCompat.NavigationPageRenderer.OnPushAsync (Xamarin.Forms.Page view, Boolean animated) [0x00000] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.AppCompat.NavigationPageRenderer.PushViewAsync (Xamarin.Forms.Page page, Boolean animated) [0x00000] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.AppCompat.NavigationPageRenderer.<OnElementChanged>b__13_0 (Xamarin.Forms.Page p) [0x00000] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.EnumerableExtensions.ForEach[T] (IEnumerable`1 enumeration, System.Action`1 action) [0x00010] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.AppCompat.NavigationPageRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1 e) [0x001af] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (Xamarin.Forms.Platform.Android.TElement element) [0x000fc] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.RendererFactory.GetRenderer (Xamarin.Forms.VisualElement view) [0x00000] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.AppCompat.Platform.AddChild (Xamarin.Forms.Page page, Boolean layout) [0x00015] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x00090] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage (Xamarin.Forms.Page page) [0x0001a] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.AppOnPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs args) [0x0001e] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x00012] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Application.set_MainPage (Xamarin.Forms.Page value) [0x0008b] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Smartbit.App.OnResume () [0x00020] in C:UsersleoncDocumentsVisual Studio 2015ProjectsSmartbitSmartbitSmartbitApp.xaml.cs:52 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Application.SendResume () [0x00006] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnStateChanged () [0x00039] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnRestart () [0x00019] in <filename unknown>:0 
03-09 13:43:52.098 I/MonoDroid( 1243):   at Android.App.Activity.n_OnRestart (IntPtr jnienv, IntPtr native__this) [0x00009] in /Users/builder/data/lanes/2098/3efa14c4/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.App.Activity.cs:4539 
03-09 13:43:52.098 I/MonoDroid( 1243):   at (wrapper dynamic-method) System.Object:cba7a870-1435-4f70-9059-e10915aba0c0 (intptr,intptr)
03-09 13:43:52.098 I/MonoDroid( 1243):   --- End of managed exception stack trace ---
03-09 13:43:52.098 I/MonoDroid( 1243): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1448)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1466)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:634)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:613)
03-09 13:43:52.098 I/MonoDroid( 1243):  at md5b60ffeb829f638581ab2bb9b1a7f4f3f.FormsAppCompatActivity.n_onRestart(Native Method)
03-09 13:43:52.098 I/MonoDroid( 1243):  at md5b60ffeb829f638581ab2bb9b1a7f4f3f.FormsAppCompatActivity.onRestart(FormsAppCompatActivity.java:86)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.app.Instrumentation.callActivityOnRestart(Instrumentation.java:1181)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.app.Activity.performRestart(Activity.java:5291)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.app.Activity.performResume(Activity.java:5302)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2764)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2803)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.os.Handler.dispatchMessage(Handler.java:102)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.os.Looper.loop(Looper.java:136)
03-09 13:43:52.098 I/MonoDroid( 1243):  at android.app.ActivityThread.main(ActivityThread.java:5001)
03-09 13:43:52.098 I/MonoDroid( 1243):  at java.lang.reflect.Method.invokeNative(Native Method)
03-09 13:43:52.098 I/MonoDroid( 1243):  at java.lang.reflect.Method.invoke(Method.java:515)
03-09 13:43:52.098 I/MonoDroid( 1243):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
03-09 13:43:52.098 I/MonoDroid( 1243):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
03-09 13:43:52.098 I/MonoDroid( 1243):  at dalvik.system.NativeStart.main(Native Method)

推荐答案

我通过在设置 MainPage 之前在我的 OnResume 方法中添加一个线程 sleep 来解决它.我的 OnResume 现在看起来像这样:

I solved it by adding a thread sleep in my OnResume method before setting the MainPage. My OnResume now looks like this:

protected override void OnResume()
{
    base.OnResume();

    Task.Delay(10).Wait();

    bool isRegistered = _authenticationService.IsRegistered();

    MainPage = isRegistered 
        ? new NavigationPage(new LoginPage()) 
        : new NavigationPage(new RegisterPage());
}

有关此变通方法，请参阅此错误报告.

See this bug report for this workaround.

这篇关于应用程序恢复导致 FormsAppCompatActivity 崩溃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

查看全文
相关文章
移动开发最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆