[Bug] Android NullReferenceException GetMetaData

[mknotzer]

On Startup MediaElement (Source not set) causes an unhandled Exception:

{System.NullReferenceException: Object reference not set to an instance of an object. at Xamarin.CommunityToolkit.UI.Views.FormsVideoView+<>c__DisplayClass7_0.b__0 () [0x00006] in <08abc6c084af4622851290c7f2f974ff>:0 at System.Threading.Tasks.…}

at Xamarin.CommunityToolkit.UI.Views.FormsVideoView+<>c__DisplayClass7_0.b__0 () [0x00006] in <08abc6c084af4622851290c7f2f974ff>:0
at System.Threading.Tasks.Task.InnerInvoke () [0x0000f] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2476
at System.Threading.Tasks.Task.Execute () [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2319

Xamarin Toolkit 1.0.3

The view works later despite the exception, playing a video is possible.

[AmrAlSayed0]

The only thing that can be null in this function is the Uri itself https://github.com/xamarin/XamarinCommunityToolkit/blob/main/src/CommunityToolkit/Xamarin.CommunityToolkit/Views/MediaElement/Android/FormsVideoView.android.cs#L59-L78

[mknotzer]

the source is not set in the XAML, so why would MediaElement call GetMediaData?

<toolkit:MediaElement
x:Name="xVideo"
AutoPlay="false"
BackgroundColor="Black"
HeightRequest="300"
HorizontalOptions="Center"
ShowsPlaybackControls="False"
WidthRequest="500" />

[AmrAlSayed0]

It's probably this

XamarinCommunityToolkit/src/CommunityToolkit/Xamarin.CommunityToolkit/Views/MediaElement/Android/MediaElementRenderer.android.cs

Line 345 in 0db9352

view.SetVideoURI(null);

Bind Source to a dummy value before switching it to the real value and see if that fixes the issue.

[mknotzer]

issue still exists on Android.

<toolkit:MediaElement
x:Name="xVideo"
AutoPlay="false"
BackgroundColor="Black"
HeightRequest="300"
HorizontalOptions="Center"
ShowsPlaybackControls="False"
Source="{Binding Source, Source={x:Reference xThis}}"
WidthRequest="500" />

Later use of

Source = new Uri(...)

not successful either (iOS and Android), have to use

xVideo.Source = new Uri(...)

instead.

[pictos]

@mknotzer
Could you attach a small repro?