listview - 在Android上出现内存不足错误的缓存图像(ffimageloading)-Xamarin Forms

我在ffimageloading:CachedImage库中有一些图像的 ListView ...。
但是...在测试时，我会重复执行此操作:打开 ListView 并在确定的时间按操作栏上的“后退”按钮，当我按下“后退”按钮时，我有一个异常(exception):



在此错误之前，我还可以在输出中看到:



我更新了ffimageloading，但错误仍然在这里...我尝试了

MONO_GC_PARAMS=bridge-implementation=old

在环境txt中

这是我在PCL中的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="neoFly_Montana.Views.ProdutosView"
         xmlns:local="clr-namespace:neoFly_Montana.LayoutScripts"
         xmlns:interface="clr-namespace:neoFly_Montana.Interface"
         xmlns:ffimageloading="clr-namespace:FFImageLoading.Forms;assembly=FFImageLoading.Forms"
         BackgroundImage="prodBackground.jpg"
         x:Name="ParentHost">

<ContentPage.Content>

        <Grid HorizontalOptions="FillAndExpand" RowSpacing="0" VerticalOptions="FillAndExpand">
        <Grid.RowDefinitions>
            <RowDefinition Height="9.4*"/>
            <RowDefinition Height="0.6*"/>
        </Grid.RowDefinitions>

        <!-- Lista de produtos -->
            <ListView Grid.Row="0" Grid.Column="0" ItemSelected="ListView_ItemSelected" CachingStrategy="RecycleElement" BackgroundColor="Transparent" x:Name="listview_produtos" Margin="10,0,10,0" SeparatorVisibility="None" HasUnevenRows="True" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">

            <ListView.Header>

                <!-- Observação -->
                <StackLayout>
                <StackLayout x:Name="prod_stack_obser" IsVisible="False" Orientation="Horizontal" Spacing="0" HorizontalOptions="FillAndExpand">
                    <Label x:Name="label_observ" HorizontalTextAlignment="Start" VerticalOptions="Center" FontSize="Small" TextColor="White" Style="{StaticResource labelsfont}" Margin="20,10,0,10" />
                    <ffimageloading:CachedImage x:Name="lapis" Source="lapis.png" IsVisible="False" HorizontalOptions="EndAndExpand"/>
                </StackLayout>
                <BoxView HeightRequest="20"/>
                </StackLayout>
            </ListView.Header>

                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>

                        <Grid Margin="20,0,20,20">
                            <ffimageloading:CachedImage Source="texturaCateg.png" BackgroundColor="{Binding FundoColor, Source={x:Reference ParentHost}}" Grid.Row="0" Grid.Column="0" Aspect="Fill" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"/>

                            <StackLayout Grid.Row="0" Grid.Column="0" VerticalOptions="FillAndExpand" x:Name="produtos_stack_color" Spacing="10">

                                <StackLayout Spacing="0" Grid.Row="0" Grid.Column="0" HorizontalOptions="FillAndExpand" VerticalOptions="CenterAndExpand">

                                <StackLayout Orientation="Horizontal" Padding="10,10,10,0" VerticalOptions="Center" HorizontalOptions="FillAndExpand">
                                        <ffimageloading:CachedImage FadeAnimationForCachedImages="True" DownsampleUseDipUnits="True" DownsampleHeight="60" HeightRequest="83" WidthRequest="130" Source="{Binding imagem}" Aspect="Fill" VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand" >
                                            <!--<ffimageloading:CachedImage.CacheKeyFactory>
                                                <interface:CustomCacheKeyFactory/>
                                            </ffimageloading:CachedImage.CacheKeyFactory>-->
                                        </ffimageloading:CachedImage>

                                        <!--HeightRequest="83" WidthRequest="100"-->
                                        <!--DownsampleHeight="83"-->
                                        <!--<StackLayout Orientation="Horizontal" VerticalOptions="Center" HorizontalOptions="EndAndExpand">
                                                <Label Style="{StaticResource labelsfont}" Text="R$" VerticalOptions="CenterAndExpand" TextColor="{Binding TextColor, Source={x:Reference ParentHost}}" FontSize="Medium"/>
                                                <Label Style="{StaticResource labelsfont}" Text="{Binding valor}" TextColor="{Binding TextColor, Source={x:Reference ParentHost}}" FontAttributes="Bold" VerticalOptions="Start" FontSize="30"/>
                                            </StackLayout>-->

                                </StackLayout>

                                        <!--nome-->
                                    <Label Text="{Binding nome}"  Margin="0,10,0,10" Style="{StaticResource labelsfont}" TextColor="{Binding TextColor, Source={x:Reference ParentHost}}" HorizontalTextAlignment="Center" FontAttributes="Bold" FontSize="Medium" HorizontalOptions="CenterAndExpand"/>

                                </StackLayout>
                                <Grid VerticalOptions="FillAndExpand">
                                    <BoxView Grid.Row="0" Grid.Column="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" BackgroundColor="WhiteSmoke" Opacity="0.2"/>
                                    <Label Grid.Row="0" Grid.Column="0" Margin="10,10,10,10" HorizontalTextAlignment="Center" Text="{Binding observacao}" Opacity="1" FontSize="Small" Style="{StaticResource labelsfont}" TextColor="{Binding TextColor, Source={x:Reference ParentHost}}" HorizontalOptions="Center" />
                                </Grid>
                            </StackLayout>
                        </Grid>

                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
                <ListView.Footer>

                <StackLayout>
                    <Grid x:Name="prod_rl_fundo" >
                    <Grid.Margin>
                        <OnPlatform x:TypeArguments="Thickness"
                                 iOS="20,0,20,0"
                                 Android="20,10,20,10"/>
                    </Grid.Margin>
                        <ffimageloading:CachedImage x:Name="prod_acomp_img" Source="texturaCateg.png" Grid.Row="0" Grid.Column="0" HorizontalOptions="FillAndExpand" Aspect="Fill" VerticalOptions="FillAndExpand"></ffimageloading:CachedImage>

                        <!--Acompanhamentos-->
                    <StackLayout x:Name="stack_acompanhamentos" Spacing="0" Grid.Row="0" Grid.Column="0">

                        <Grid x:Name="prod_acompanhamentos_title" HorizontalOptions="FillAndExpand">
                            <BoxView Grid.Row="0" Grid.Column="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" BackgroundColor="WhiteSmoke" Opacity="0.2"/>
                            <Label x:Name="produtos_acomp_title" Text="+ Dois Acompanhamentos" Grid.Row="0" Grid.Column="0" Style="{StaticResource labelsfont}" Margin="20,20,20,20" FontAttributes="Bold" VerticalOptions="CenterAndExpand" HorizontalOptions="Center" />
                        </Grid>

                    </StackLayout>
                    </Grid>

                <BoxView HeightRequest="50"></BoxView>
                </StackLayout>

            </ListView.Footer>

            </ListView>

            <!--Rodapé Grid-->
            <Grid Grid.Row="1" Grid.Column="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
            <ffimageloading:CachedImage Source="rodape.png"
                       HorizontalOptions="FillAndExpand"
                       Aspect="AspectFill"
                       VerticalOptions="FillAndExpand"
                   Grid.Row="0"/>

            <!--Escrito Rodapé-->
            <StackLayout Orientation="Horizontal"
                   Margin ="5,5,5,5" VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand" Grid.Row="0">
                    <Label
                   FontSize="Micro"
                   Text="Você está em:"
                   Style="{StaticResource labelsfont}"
                   VerticalOptions="CenterAndExpand"
                   TextColor="White"/>

                    <Label FontSize="Micro"
                   Text="loja"
                   x:Name="prod_lbl_lojaprox"
                   Style="{StaticResource labelsfont}"
                   VerticalOptions="CenterAndExpand"
                   TextColor="{StaticResource laranjacolor}"
                   LineBreakMode="TailTruncation"
                   FontAttributes="Bold" />
                </StackLayout>
            </Grid>
        </Grid>

</ContentPage.Content>

我的mainActivity:

  protected override void OnCreate(Bundle bundle)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(bundle);

        global::Xamarin.Forms.Forms.Init(this, bundle);

        //inicializa imageCircle
        ImageCircleRenderer.Init();

        //shared Preferences
        App.Init(new AndroidUserPreferences());

        //Gerenciador de memória
        CachedImageRenderer.Init(true);
        var config = new FFImageLoading.Config.Configuration()
        {
            VerboseLogging = false,
            VerbosePerformanceLogging = false,
            VerboseMemoryCacheLogging = false,
            VerboseLoadingCancelledLogging = false,
            FadeAnimationForCachedImages = false,
            MaxMemoryCacheSize = 50000000,
            FadeAnimationDuration = 500

            //Logger = new CustomLogger(),
        };
        FFImageLoading.ImageService.Instance.Initialize(config);

        LoadApplication(new App());
    }

     public override void OnTrimMemory([GeneratedEnum] TrimMemory level)
    {
        FFImageLoading.ImageService.Instance.InvalidateMemoryCache();
        GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

        base.OnTrimMemory(level);
    }

    public override void OnLowMemory()
    {
        FFImageLoading.ImageService.Instance.InvalidateMemoryCache();
        GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

        base.OnLowMemory();
    }

我的图片是base64(png)
他们有8kb，它们是150x84像素

其中之一:



更新:我已经搜索了很多...我需要缓存键吗？

最佳答案

您是否在MainActivity中实现了InvalidateMemoryCache？在https://github.com/luberda-molinet/FFImageLoading/wiki/Advanced-Usage#clear-cache-and-memory-considerations上阅读更多内容

    public override void OnTrimMemory([GeneratedEnum] TrimMemory level)
    {
        FFImageLoading.ImageService.Instance.InvalidateMemoryCache();
        GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

        base.OnTrimMemory(level);
    }

    public override void OnLowMemory()
    {
        FFImageLoading.ImageService.Instance.InvalidateMemoryCache();
        GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

        base.OnLowMemory();
    }

我认为问题出在您的base64逻辑上，但是让我们尝试一下。

关于listview - 在Android上出现内存不足错误的缓存图像(ffimageloading)-Xamarin Forms，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/48990718/