Steps to Reproduce

1. Create a Xamarin android project with the following versions:

Xamarin v4.8.0.753
Android SDK v8.1.0.25

2. install nugget Xamarin.Android.Support.v7.AppCompat (v26.1.0.1)
3. Create a layout and add a date picker.

Expected Behavior

date picker is rendered on the layout viewer

Actual Behavior

Throws an exception.

Version Information

Xamarin v4.8.0.753
Android SDK v8.1.0.25
Xamarin.Android.Support.v7.AppCompat (v26.1.0.1)

Log File

Trying to load class android.support.v7.widget.AppCompatTextView

Failed to process message RenderLayout
mono.android.DesignerException: java.lang.NullPointerException
at mono.android.DesignerException.fromThrowable(DesignerException.java:46)
at mono.android.DesignerSession.checkRenderResultForError(DesignerSession.java:190)
at mono.android.DesignerSession.renderInternal(DesignerSession.java:343)
at mono.android.SessionProjectCallback.computeInMonoDroidContextUnsafe(SessionProjectCallback.java:112)
at mono.android.DesignerSession.render(DesignerSession.java:335)
at mono.android.DesignerSession.processMessage(DesignerSession.java:721)
at mono.android.MessageListener.executeMessage(MessageListener.java:88)
at mono.android.MessageListener$Runner.run(MessageListener.java:44)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at android.content.res.Resources_Delegate.getValue(Resources_Delegate.java:788)
at android.content.res.Resources.getValue(Resources.java:1286)
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:212)
at android.support.v4.content.res.ResourcesCompat.getFont(ResourcesCompat.java:206)
at android.support.v7.widget.TintTypedArray.getFont(TintTypedArray.java:119)
at android.support.v7.widget.AppCompatTextHelper.updateTypefaceAndStyle(AppCompatTextHelper.java:208)
at android.support.v7.widget.AppCompatTextHelper.onSetTextAppearance(AppCompatTextHelper.java:242)
at android.support.v7.widget.AppCompatTextView.setTextAppearance(AppCompatTextView.java:161)
at android.widget.TextView.setTextAppearance(TextView.java:2791)
at android.widget.YearPickerView$YearAdapter.getView(YearPickerView.java:192)
at android.widget.AbsListView.obtainView(AbsListView.java:2362)
at android.widget.ListView.onMeasure(ListView.java:1203)
at android.view.View.measure(View.java:19734)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at com.android.internal.widget.DialogViewAnimator.onMeasure(DialogViewAnimator.java:64)
at android.view.View.measure(View.java:19734)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19734)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19734)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19734)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1293)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.widget.ScrollView.onMeasure(ScrollView.java:340)
at android.view.View.measure(View.java:19734)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
at android.view.View.measure(View.java:19734)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:400)
at android.view.View.measure(View.java:19734)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:19734)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:589)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.doLayout(RenderSessionImpl.java:379)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.renderAndBuildResult(RenderSessionImpl.java:534)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:422)
at com.android.layoutlib.bridge.BridgeRenderSession.render(BridgeRenderSession.java:104)
at mono.android.DesignerSession.renderInternal(DesignerSession.java:342)