Xamarin PushAsync，一个未处理的异常已经发生-Java 学习之路

我有一个页面，我有一个REST API调用，并在调试时成功地带来了结果，但是我们得到一个未处理的异常，如果我们放一个try catch，没有显示详细信息，

XAML

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="FCR.App.Views.DetailsContactNaPage">
    <ContentPage.Content>
        <Grid VerticalOptions="StartAndExpand" HorizontalOptions="CenterAndExpand">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>

            <ListView x:Name="lstView" Grid.Row="0" VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <TextCell Text="{Binding NombreCompleto}" Detail="{Binding Descripcion}" />
                </DataTemplate>

            </ListView.ItemTemplate>

        </ListView>
        <Label Grid.Row="1" HorizontalOptions="Center" Text="¿Desea continuar registrando el contacto?" FontAttributes="Bold" FontSize="Medium"  />
            <Button Grid.Row="2" HorizontalOptions="Center" x:Name="dismissbutton" Text="Sí" Clicked="OnDismissButtonClicked"></Button>
            <Button Grid.Row="3" HorizontalOptions="Center" x:Name="dismissbutton2" Text="No" Clicked="Clearnextview"></Button>
        </Grid>
    </ContentPage.Content>
</ContentPage>

然后是方法 .

private async void Blurevent(object sender, FocusEventArgs e)
        {

            if (txtPnombre.Text != null && txtPapellido.Text != null)
            {
                var nombre = txtPnombre.Text.Trim();
                var apellido = txtPapellido.Text.Trim();
                var result = await App.NaturalezaManager.GetNombresApellidos(nombre,apellido);
                if (result.Count >= 1)
                {
                   var respuesta = await DisplayAlert("Registros", "Se han encontrado registros, ¿Desea verlos?", "Sí","No");
                    if (respuesta)
                    {
                        var detallepage = new DetailsContactNaPage(result);


                            await Navigation.PushModalAsync(detallepage);



                        //await DisplayAlert("Registrados", result[0].PrimerNombre + " "+ result[0].PrimerApellido+ "", "Sí", "No");
                    }
                }

            }


        }

更新1：

错误

Xamarin引起的：android.runtime.JavaProxyThrowable：System.MissingMethodException：找不到方法'Android.Widget.TextView.SetTextAppearance' . Xamarin.Forms.Platform.Android.BaseCellView.BaseCellView（Context context，Cell cell）：0 Xamarin.Forms.Platform.Android.TextCellRenderer.TextCellView.TextCellRenderer（Context context，Cell cell）：0 Xamarin.Forms.Platform.Android . TextCellRenderer.GetCellCore（Cell item，View convertView，ViewGroup parent，Context context）：0 Xamarin.Forms.Platform.Android.CellRenderer.GetCell（Cell item，View convertView，ViewGroup parent，Context context）：0 Xamarin.Forms.Platform . Android.CellFactory.GetCell（Cell item，View convertView，ViewGroup parent，Context context，View view）：0 Xamarin.Forms.Platform.Android.ListViewAdapter.GetView（int position，View convertView，ViewGroup parent）：0 Android.Widget . BaseAdapter.n_GetView_ILandroid_view_View_Landroid_view_ViewGroup_（IntPtr jnienv，IntPtr native__this，int position，IntPtr native_convertView，IntPtr native_parent）：0 at（wrapper dynamic-method）System.Object：10d75808-73c9-4d3e-9e67-1b2609993ff0（intptr，intptr，int，intptr， intptr）md5b60ffeb829f638581ab2bb9b1a7 f4f3f.ListViewAdapter.n_getView（Native Method）md5b60ffeb829f638581ab2bb9b1a7f4f3f.ListViewAdapter.getView（）ListViewAdapter.java:100 android.widget.HeaderViewListAdapter.getView（）HeaderViewListAdapter.java:220 android.widget.AbsListView.obtainView（）AbsListView.java:2346 android .widget.ListView.makeAndAddView（）ListView.java:1876 android.widget.ListView.fillDown（）ListView.java:702 android.widget.ListView.fillFromTop（）ListView.java:763 android.widget.ListView.layoutChildren（） ListView.java:1685 android.widget.AbsListView.onLayout（）AbsListView.java:2148 android.view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 android.support .v4.widget.SwipeRefreshLayout.onLayout（）SwipeRefreshLayout.java:596 android.view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 md5b60ffeb829f638581ab2bb9b1a7f4f3f.ListViewRenderer.n_onLayout（Native方法）md5b60ffeb829f638581ab2bb9b1a7f4f3f.ListViewRenderer.onLayout（）ListViewRenderer.java:65 android.v iew.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 com.xamarin.forms.platform.android.FormsViewGroup.measureAndLayout（）FormsViewGroup.java:29 md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1 . n_onLayout（本机方法）md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.onLayout（）VisualElementRenderer_1.java:49 android.view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 com.xamarin.forms .platform.android.FormsViewGroup.measureAndLayout（）FormsViewGroup.java:29 md5270abb39e60627f0f200893b490a1ade.Platform_ModalContainer.n_onLayout（Native Method）md5270abb39e60627f0f200893b490a1ade.Platform_ModalContainer.onLayout（）Platform_ModalContainer.java:53 android.view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 md5b60ffeb829f638581ab2bb9b1a7f4f3f.PlatformRenderer.n_onLayout（Native Method）md5b60ffeb829f638581ab2bb9b1a7f4f3f.PlatformRenderer.onLayout（）PlatformRenderer.java:63 andro id.view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 android.widget.RelativeLayout.onLayout（）RelativeLayout.java:1079 android.view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 android.widget.FrameLayout.layoutChildren（）FrameLayout.java:336 android.widget.FrameLayout.onLayout（）FrameLayout.java:273 android . view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 android.widget.LinearLayout.setChildFrame（）LinearLayout.java:1735 android.widget.LinearLayout.layoutVertical（）LinearLayout .java：1579 android.widget.LinearLayout.onLayout（）LinearLayout.java:1488 android.view.View.layout（）View.java:16639 android.view.ViewGroup.layout（）ViewGroup.java:5437 android.widget . FrameLayout.layoutChildren（）FrameLayout.java:336 android.widget.FrameLayout.onLayout（）FrameLayout.java:273 com.android.internal.policy.PhoneWindow $ DecorView.onLayout（）PhoneWindow.java:2934 android.view.View . 布局（）View.java:16639android.view.ViewGroup.layout（）ViewGroup.java:5437 android.view.ViewRootImpl.performLayout（）ViewRootImpl.java:2179 android.view.ViewRootImpl.performTraversals（）ViewRootImpl.java:1939 android.view.ViewRootImpl.doTraversal（）ViewRootImpl.java:1115 android.view.ViewRootImpl $ TraversalRunnable.run（）ViewRootImpl.java:6023 android.view.Choreographer $ CallbackRecord.run（）Choreographer.java:858 android.view.Choreographer.doCallbacks（）Choreographer.java ：670 android.view.Choreographer.doFrame（）Choreographer.java:606 android.view.Choreographer $ FrameDisplayEventReceiver.run（）Choreographer.java:844 android.os.Handler.handleCallback（）Handler.java:739 android.os . Handler.dispatchMessage（）Handler.java:95 android.os.Looper.loop（）Looper.java:148 android.app.ActivityThread.main（）ActivityThread.java:5461 java.lang.reflect.Method.invoke（Native Method ）com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（）ZygoteInit.java:726 com.android.internal.os.ZygoteInit.main（）ZygoteInit.java:616

Xamarin PushAsync，一个未处理的异常已经发生

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