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crash on Android using Xamarin.Forms 2.4.0 and FFImageLoading 2.2.22

See original GitHub issue

Hello,

I get crash on Android using Xamarin.Forms 2.4.0 and FFImageLoading 2.2.22:

My xaml-page:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:ffimageloading="clr-namespace:FFImageLoading.Forms;assembly=FFImageLoading.Forms"
             xmlns:local="clr-namespace:Bug"
             x:Class="Bug.ImgList">
    <AbsoluteLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">        
                               <ListView
                                               HasUnevenRows="True"
                                               SeparatorVisibility="None"
                                               SeparatorColor="Transparent"
                                               IsGroupingEnabled="True"
                                               ItemsSource="{Binding ImageSrc}"
                                               ItemSelected="OnItemSelected"
                                               CachingStrategy="RecycleElement"
                                               VerticalOptions="FillAndExpand">
                                               <ListView.ItemTemplate>
                                                               <DataTemplate>
                                                                              <local:ViewCell/>
                                                               </DataTemplate>
                                               </ListView.ItemTemplate>
                               </ListView>
    </AbsoluteLayout>
</ContentPage>

Where ViewCell:

<ViewCell xmlns="http://xamarin.com/schemas/2014/forms" 
          xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
          xmlns:ffimageloading="clr-namespace:FFImageLoading.Forms;assembly=FFImageLoading.Forms"
          xmlns:ffimagetransforms="clr-namespace:FFImageLoading.Transformations;assembly=FFImageLoading.Transformations"
          x:Class="Bug.ViewCell">
    <Grid x:Name="ViewCell" Margin="0, 0, 0, 22" RowSpacing="0">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="72" />
            <ColumnDefinition Width="*"/> 
        </Grid.ColumnDefinitions>

        <AbsoluteLayout HorizontalOptions="FillAndExpand" VerticalOptions="StartAndExpand" Grid.Column="0">
            <ffimageloading:CachedImage 
                Aspect="AspectFit"
                HeightRequest="40"
                WidthRequest="40"
                AbsoluteLayout.LayoutBounds="0.5, 0.5, AutoSize, AutoSize"
                AbsoluteLayout.LayoutFlags="PositionProportional"
                Source="{Binding Img}">
                <ffimageloading:CachedImage.Transformations>
                    <ffimagetransforms:CircleTransformation/>
                </ffimageloading:CachedImage.Transformations>
            </ffimageloading:CachedImage>
            <Label
                Text="{Binding Text}"
                FontSize="16"
                TextColor="White"
                AbsoluteLayout.LayoutBounds="0.5, 0.5, AutoSize, AutoSize" 
                AbsoluteLayout.LayoutFlags="PositionProportional"
                IsVisible="{Binding HasText}"/>
        </AbsoluteLayout>
    </Grid>
</ViewCell>

ImageSrc class:

public class ImageSrc
{
        public bool HasText { get; }

        public string Text
        {
                get
                {
                      return "TT";
                }
       }

       public ImageSource Img { get; } //here some different source values - some from Android resources, some from stream.
}

Create at least several hundreds of items and start scrolling list view up and down – you’ll get crash (on Android 7.0) with one of the following errors:

“JNI ERROR (app bug): attempt to use stale global reference” Or “JNI ERROR (app bug): accessed deleted global reference”

Seems to be race condition somewhere in image loading.

I don’t have any crashes when I use FFImageLoading version 2.2.6 and 2.2.11.