Picture Gallery

What is the best way to show pictures like a phone gallery? I am allready able to add pictures from device gallery and show them but i always want to show 9 pictures in one page without scrolling. What is the best way to do this for all screen sizes?

<ContentPage.Content>
         <StackLayout Margin="10,10,10,10" >
                <Button Text="{i18n:Translate ButtonAdd}" Command="{Binding AddPicture}" BorderRadius="15" TextColor="White"/>
            <flv:FlowListView FlowColumnCount="3" RowHeight="{Binding Height}" SeparatorVisibility="None" HasUnevenRows="True" FlowItemsSource="{Binding ListImages}" FlowItemTappedCommand="{Binding ItemTappedCommand}" FlowLastTappedItem="{Binding LastItem}"
                              Margin="0"> 
                    <flv:FlowListView.FlowColumnTemplate>
                    <DataTemplate>
                        <Image Source="{Binding ImagePath}" Aspect="AspectFill" Margin="5,0,5,5" />
                    </DataTemplate>
                    </flv:FlowListView.FlowColumnTemplate>
                </flv:FlowListView>
            </StackLayout>
    </ContentPage.Content>