适用于Android的Xamarin - 无法从资源文件夹中获取正确大小的图像

Question

作为Xamarin的新手，我创建了一个应用程序，其中包含一些带有少量图像的登录页面。

我将不同大小的图像放在资源中相关的可绘制文件夹中，但无论我为Android测试的设备大小，都会始终选择默认图像。

我的印象（可能是错误的）Android可以确定要使用的正确资源，所以除了在我的XAML页面中设置图像源之外，还有其他“连接”我必须做的才能获得正确的图片？此外，文本也没有调整大小，但猜测是因为我手动设置了字体大小？

- 编辑 -

below is the content from the XAML



 <ContentPage.Content>
            <!-- MAIN WRAPPER -->
            <Grid>
                <!-- ICON BACKGROUND -->
                <Grid.RowDefinitions>
                    <RowDefinition Height="150" />
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <StackLayout Padding="0,0,0,380" VerticalOptions="Center" HorizontalOptions="Center" x:Name="logoStack">
                    <Label Text="" />
                    <Image x:Name="logo" Source="MyLogo.png" 
                           Grid.Row="1"
                        HorizontalOptions="Center"
                        Aspect="AspectFill"
                        VerticalOptions="Center" 
                           />
                    <Label Text="" />

                </StackLayout>

                <StackLayout Padding="0,110,0,0" VerticalOptions="Center" HorizontalOptions="Center" x:Name="imgStack">

                    <Image
                    x:Name="img"
                    Grid.Row="2"
                    Source=""
                    HorizontalOptions="Center"
                        Aspect="AspectFill"
                        VerticalOptions="Center"
                    />
                </StackLayout>

                <Grid 
                    Grid.Row="0"
                    Padding="0"
                    Margin="0,30,0,0"
                    VerticalOptions="Center" >

                    <!--FIRST LEVEL ELLIPSIS-->
                    <Label
                        Style="{DynamicResource WalktrhoughItemTemplateShape}" 
                        FontSize="360"
                        />

                    <!--SECOND LEVEL ELLIPSIS-->
                    <Label
                        Style="{DynamicResource WalktrhoughItemTemplateShape}" 
                        FontSize="260"
                        />

                    <!--SECOND LEVEL ELLIPSIS-->
                    <Label
                        Style="{DynamicResource WalktrhoughItemTemplateShape}" 
                        FontSize="180"
                        />

                    <!--ICON BACKGROUND-->
                    <Label
                        Style="{DynamicResource WalktrhoughItemTemplateShape}" 
                        FontSize="130"
                        Opacity="0.3"
                        />

                    <!--ICON-->
                    <Label
                        x:Name="IconLabel"
                        Style="{DynamicResource WalkthroughStepIconStyle}"
                        VerticalOptions="Center"
                        Text="{ x:Static font:GrialShapesFont.LogoGrial }"
                        />

                </Grid>

                <!--TEXT -->
                <StackLayout x:Name="headerStack"
                        Grid.Row="3" 
                        Padding="20, 40, 20, 0"
                        VerticalOptions="Center" HorizontalOptions="Center">
                    <Label 
                        x:Name="HeaderLabel"
                        HorizontalTextAlignment="Center" 
                        HorizontalOptions="CenterAndExpand"
                        Text="" 
                        FontSize="22" 
                        FontFamily="Helvetica Neue"

                        TextColor="#E9F2F8"/>
                </StackLayout>
                <StackLayout x:Name="txtStack"
                        Grid.Row="4" 
                        Padding="20, 0, 20, 0"
                        VerticalOptions="Center" HorizontalOptions="Center">
                    <Label 
                        x:Name="DescriptionLabel"
                        HorizontalTextAlignment="Center"
                        HorizontalOptions="CenterAndExpand"
                        Opacity="0.7" 
                        Text="" 
                        FontSize="14" 
                        FontFamily="Helvetica Neue"
                        TextColor="#E9F2F8"/>
                </StackLayout>

                <StackLayout Grid.Row="5" x:Name="sIndicator"
                        Padding="20, 25, 20, 0"
                        Spacing="0"
                        >
                    <Image
                    x:Name="indicator"
                    Source=""
                    HorizontalOptions="Center"
                        Aspect="AspectFill"
                        WidthRequest="140" 
                        HeightRequest="10"
                        VerticalOptions="Center"
                    />
                </StackLayout>

                <!--BUTTON-->
                <StackLayout  Grid.Row="6" x:Name="sButton">
                <artina:Button 
                    Grid.Row="6"
                    Margin="20"
                    Style="{DynamicResource PrimaryActionButtonStyle}"
                    x:Name="PrimaryActionButton"
                    BackgroundColor="#FFFFFF"
                    TextColor="#2980B9"
                    VerticalOptions="End"
                    Command="{Binding LoginPageRedirect}"
                    Text="Login"/>
                </StackLayout>
                <!--BUTTON-->
            </Grid>
        </ContentPage.Content>

感谢