Crashing on android

[wocar]

Description

Steps to Reproduce

<sv:SettingsView x:Name="SettingsView1" VerticalOptions="CenterAndExpand" HasUnevenRows="true">

               <sv:Section HeaderHeight="100">
                   <sv:TimePickerCell
                       x:Name="TimeCell"
                       
                       Title="Hour" Format="%h:mm tt" Time="{Binding Reminder.Time}" />
                   
                   <sv:PickerCell Title="Day"
                                  x:Name="PickerCell"
                                  SelectionMode="Single"
                                  ItemsSource="{Binding DayList}"
                                  SelectedItem="{Binding Reminder.Day}"
                                  DisplayMember="Name"
                                  KeepSelectedUntilBack="true"
                                  PageTitle="Day" />

               

               
               </sv:Section>
               <sv:Section IsVisible="{Binding ShowDeleteButton}">
                   <sv:ButtonCell
                       Command="{Binding DeleteCommand}" Title="Delete alarm" TitleColor="Red" />
               </sv:Section>

           </sv:SettingsView>

Expected Behavior

To display the settings view

Actual Behavior

App Crashes

I get an exception:

System.NullReferenceException: Object reference not set to an instance of an object.

07-03 18:31:07.545 F/DEBUG   (10796): Abort message: 'JNI DETECTED ERROR IN APPLICATION: JNI NewString called with pending exception android.runtime.JavaProxyThrowable: System.NullReferenceException: Object reference not set to an instance of an object.
07-03 18:31:07.545 F/DEBUG   (10796):   at MvvmCross.Platforms.Android.Binding.Views.MvxLayoutInflater.Inflate (System.Int32 resource, Android.Views.ViewGroup root, System.Boolean attachToRoot) [0x00006] in D:\a\1\s\MvvmCross\Platforms\Android\Binding\Views\MvxLayoutInflater.cs:123 
07-03 18:31:07.545 F/DEBUG   (10796):   at AiForms.Renderers.Droid.SettingsViewRecyclerAdapter.OnCreateViewHolder (Android.Views.ViewGroup parent, System.Int32 viewType) [0x0003d] in <1e41ed7b2758417684675b42060962c6>:0 
07-03 18:31:07.545 F/DEBUG   (10796):   at AndroidX.RecyclerView.Widget.RecyclerView+Adapter.n_OnCreateViewHolder_Landroid_view_ViewGroup_I (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_parent, System.Int32 viewType) [0x00010] in D:\a\1\s\generated\androidx.recyclerview.recyclerview\obj\Release\monoandroid90\generated\src\AndroidX.RecyclerView.Widget.RecyclerView.cs:470 
07-03 18:31:07.545 F/DEBUG   (10796):   at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.93(intptr,intptr,intptr,int)
07-03 18:31:07.545 F/DEBUG   (10796):   at androidx.recyclerview.widget.RecyclerView$ViewHolder crc6484fad89fba26ff1d.SettingsViewRecyclerAdapter.n_onCreateViewHolder(android.view.ViewGroup, int) (SettingsViewRecyclerAdapter.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at androidx.recyclerview.widget.RecyclerView$ViewHolder crc6484fad89fba26ff1d.SettingsViewRecyclerAdapter.onCreateViewHolder(android.view.ViewGroup, int) (SettingsViewRecyclerAdapter.java:61)
07-03 18:31:07.545 F/DEBUG   (10796):   at androidx.recyclerview.widget.RecyclerView$ViewHolder androidx.recyclerview.widget.RecyclerView$Adapter.createViewHolder(android.view.ViewGroup, int) (RecyclerView.java:7078)
07-03 18:31:07.545 F/DEBUG   (10796):   at androidx.recyclerview.widget.RecyclerView$ViewHolder androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(int, boolean, long) (RecyclerView.java:6235)
07-03 18:31:07.545 F/DEBUG   (10796):   at android.view.View androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(int, boolean) (RecyclerView.java:6118)
07-03 18:31:07.545 F/DEBUG   (10796):   at android.view.View androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(int) (RecyclerView.java:6114)
07-03 18:31:07.545 F/DEBUG   (10796):   at android.view.View androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(androidx.recyclerview.widget.RecyclerView$Recycler) (LinearLayoutManager.java:2303)
07-03 18:31:07.545 F/DEBUG   (10796):   at void androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(androidx.recyclerview.widget.RecyclerView$Recycler, androidx.recyclerview.widget.RecyclerView$State, androidx.recyclerview.widget.LinearLayoutManager$LayoutState, androidx.recyclerview.widget.LinearLayoutManager$LayoutChunkResult) (LinearLayoutManager.java:1627)
07-03 18:31:07.545 F/DEBUG   (10796):   at int androidx.recyclerview.widget.LinearLayoutManager.fill(androidx.recyclerview.widget.RecyclerView$Recycler, androidx.recyclerview.widget.LinearLayoutManager$LayoutState, androidx.recyclerview.widget.RecyclerView$State, boolean) (LinearLayoutManager.java:1587)
07-03 18:31:07.545 F/DEBUG   (10796):   at void androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(androidx.recyclerview.widget.RecyclerView$Recycler, androidx.recyclerview.widget.RecyclerView$State) (LinearLayoutManager.java:665)
07-03 18:31:07.545 F/DEBUG   (10796):   at void androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2() (RecyclerView.java:4134)
07-03 18:31:07.545 F/DEBUG   (10796):   at void androidx.recyclerview.widget.RecyclerView.dispatchLayout() (RecyclerView.java:3851)
07-03 18:31:07.545 F/DEBUG   (10796):   at void androidx.recyclerview.widget.RecyclerView.onLayout(boolean, int, int, int, int) (RecyclerView.java:4404)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.ViewRenderer_2.n_onLayout(boolean, int, int, int, int) (ViewRenderer_2.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.ViewRenderer_2.onLayout(boolean, int, int, int, int) (ViewRenderer_2.java:47)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void com.xamarin.forms.platform.android.FormsViewGroup.measureAndLayout(int, int, int, int, int, int) (FormsViewGroup.java:37)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.Platform_DefaultRenderer.n_onLayout(boolean, int, int, int, int) (Platform_DefaultRenderer.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.Platform_DefaultRenderer.onLayout(boolean, int, int, int, int) (Platform_DefaultRenderer.java:72)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void com.xamarin.forms.platform.android.FormsViewGroup.measureAndLayout(int, int, int, int, int, int) (FormsViewGroup.java:37)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.PageRenderer.n_onLayout(boolean, int, int, int, int) (PageRenderer.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.PageRenderer.onLayout(boolean, int, int, int, int) (PageRenderer.java:72)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void com.xamarin.forms.platform.android.FormsViewGroup.measureAndLayout(int, int, int, int, int, int) (FormsViewGroup.java:37)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc64720bb2db43a66fe9.NavigationPageRenderer.n_onLayout(boolean, int, int, int, int) (NavigationPageRenderer.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc64720bb2db43a66fe9.NavigationPageRenderer.onLayout(boolean, int, int, int, int) (NavigationPageRenderer.java:65)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void com.xamarin.forms.platform.android.FormsViewGroup.measureAndLayout(int, int, int, int, int, int) (FormsViewGroup.java:37)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc64720bb2db43a66fe9.Platform_ModalContainer.n_onLayout(boolean, int, int, int, int) (Platform_ModalContainer.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc64720bb2db43a66fe9.Platform_ModalContainer.onLayout(boolean, int, int, int, int) (Platform_ModalContainer.java:53)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.PlatformRenderer.n_onLayout(boolean, int, int, int, int) (PlatformRenderer.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at void crc643f46942d9dd1fff9.PlatformRenderer.onLayout(boolean, int, int, int, int) (PlatformRenderer.java:63)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.RelativeLayout.onLayout(boolean, int, int, int, int) (RelativeLayout.java:1103)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.layoutChildren(int, int, int, int, boolean) (FrameLayout.java:332)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.onLayout(boolean, int, int, int, int) (FrameLayout.java:270)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.layoutChildren(int, int, int, int, boolean) (FrameLayout.java:332)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.onLayout(boolean, int, int, int, int) (FrameLayout.java:270)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.layoutChildren(int, int, int, int, boolean) (FrameLayout.java:332)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.onLayout(boolean, int, int, int, int) (FrameLayout.java:270)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.LinearLayout.setChildFrame(android.view.View, int, int, int, int) (LinearLayout.java:1829)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.LinearLayout.layoutVertical(int, int, int, int) (LinearLayout.java:1673)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.LinearLayout.onLayout(boolean, int, int, int, int) (LinearLayout.java:1582)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.layoutChildren(int, int, int, int, boolean) (FrameLayout.java:332)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.widget.FrameLayout.onLayout(boolean, int, int, int, int) (FrameLayout.java:270)
07-03 18:31:07.545 F/DEBUG   (10796):   at void com.android.internal.policy.DecorView.onLayout(boolean, int, int, int, int) (DecorView.java:776)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.View.layout(int, int, int, int) (View.java:22826)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewGroup.layout(int, int, int, int) (ViewGroup.java:6316)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewRootImpl.performLayout(android.view.WindowManager$LayoutParams, int, int) (ViewRootImpl.java:3434)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewRootImpl.performTraversals() (ViewRootImpl.java:2907)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewRootImpl.doTraversal() (ViewRootImpl.java:1934)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.ViewRootImpl$TraversalRunnable.run() (ViewRootImpl.java:8127)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.Choreographer$CallbackRecord.run(long) (Choreographer.java:972)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.Choreographer.doCallbacks(int, long) (Choreographer.java:796)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.Choreographer.doFrame(long, int) (Choreographer.java:731)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.view.Choreographer$FrameDisplayEventReceiver.run() (Choreographer.java:957)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.os.Handler.handleCallback(android.os.Message) (Handler.java:938)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:99)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.os.Looper.loop() (Looper.java:223)
07-03 18:31:07.545 F/DEBUG   (10796):   at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:7523)
07-03 18:31:07.545 F/DEBUG   (10796):   at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
07-03 18:31:07.545 F/DEBUG   (10796):   at void com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run() (RuntimeInit.java:592)
07-03 18:31:07.545 F/DEBUG   (10796):   at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:941)

Platforms

• Android Emulator
• iOS

Basic Information

• AiForms.SettingsView 1.2.14-pre

• Xamarin.Forms 4.7.0.813-pre2

    <PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData" Version="2.2.0.1" />
    <PackageReference Include="Xamarin.AndroidX.Browser" Version="1.2.0.1" />
    <PackageReference Include="Xamarin.Google.Android.Material" Version="1.0.0" />
    <PackageReference Include="Xamarin.AndroidX.Legacy.Support.V4" Version="1.0.0.1" />
    <PackageReference Include="Xamarin.AndroidX.AppCompat.AppCompatResources" Version="1.1.0.1" />
    <PackageReference Include="Xamarin.AndroidX.AppCompat.Resources" Version="1.1.0.1" />
    <PackageReference Include="Xamarin.AndroidX.MediaRouter" Version="1.1.0.1" />
    <PackageReference Include="Xamarin.Android.Support.Design" Version="28.0.0.3" />
    <PackageReference Include="MvvmCross" Version="6.4.2" />
    <PackageReference Include="MvvmCross.Forms" Version="6.4.2" />
  
    <TargetFrameworkVersion>v9.0</TargetFrameworkVersion>
  

[Jakar510]

This should fix the issue:

Inside of the SettingsView init, capture the context.

[Android.Runtime.Preserve(AllMembers = true)]
public static class SettingsViewInit
{
	internal static Xamarin.Forms.Platform.Android.FormsAppCompatActivity Current { get; set; }

	public static void Init( Xamarin.Forms.Platform.Android.FormsAppCompatActivity activity ) => Current = activity;
}

Change the constructor in SettingsView.Droid.Cells.CellBaseView to use the captured android context:

public CellBaseView( IntPtr javaReference, JniHandleOwnership transfer ) : base(javaReference, transfer) => _Context = SettingsViewInit.Current;

[mattiasskog]

Any progress o nthe merge of the fix? This also occurs on iOS.
Workaround seems to be not to bind to the SelectedItem.
I can get it to work if I add the SelectedItem in XAML at runtime with hotreload, but if i restart the project it crashes.