如何开发xamarin表单中的响应页面

XAML

<RelativeLayout x:Name="outer_Layout" HorizontalOptions="FillAndExpand" 
                    VerticalOptions="FillAndExpand" 
                    BackgroundColor="#14C2F4" >
        <AbsoluteLayout  RelativeLayout.WidthConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Width,Factor=1}"
            RelativeLayout.HeightConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Height,Factor=1,Constant=50}"
            RelativeLayout.XConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Width,Factor=0,Constant=0}"
            RelativeLayout.YConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Height,Factor=0,Constant=0}"
                          BackgroundColor="#14C2F4">
            <Frame HorizontalOptions="FillAndExpand"
               VerticalOptions="FillAndExpand" 
               AbsoluteLayout.LayoutBounds="0,0,1,0.13"
               BackgroundColor="#14C2F4"
               HasShadow="True"                   
               AbsoluteLayout.LayoutFlags="All">
                <Image Source="hambuger" Aspect="AspectFill"
                       WidthRequest="30" HeightRequest="20"
                       HorizontalOptions="StartAndExpand" 
                       VerticalOptions="EndAndExpand"/>
            </Frame>

            <Frame x:Name="frm_Search"
                       AbsoluteLayout.LayoutBounds="0,0.15,1,0.1"
                       AbsoluteLayout.LayoutFlags="All"
                       HorizontalOptions="FillAndExpand" 
                       MinimumHeightRequest="30"
                       VerticalOptions="FillAndExpand"
                       Padding="10,0,10,0"  BorderColor="White"
                       BackgroundColor="#14C2F4" CornerRadius="0"
                       HasShadow="False" Margin="20,10,20,10">
                <StackLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" Orientation="Horizontal">
                    <Image Source="search_white" IsVisible="False"
                           HeightRequest="20" WidthRequest="20"
                          />
                    <local:CustomEntry x:Name="ent_Search" Placeholder="Search..." 
                                       TextColor="White"
                                       PlaceholderColor="White"
                                       FontSize="15"
                                       Text="David Ro"
                                       HorizontalOptions="FillAndExpand" 
                                       VerticalOptions="Center"                                          
                                       Margin="0,5,0,0"/>
                </StackLayout>
            </Frame>
            <ListView x:Name="lv_Favorites" ItemsSource="{Binding _list}"  
                      VerticalOptions="FillAndExpand" SeparatorVisibility="None"
                      AbsoluteLayout.LayoutBounds="0,0.62,1,0.64"
                      AbsoluteLayout.LayoutFlags="All" BackgroundColor="#14C2F4" 
                      RowHeight="70"
                      Margin="0,0,0,10">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <AbsoluteLayout HorizontalOptions="FillAndExpand" 
                                            BackgroundColor="Transparent"
                                            Margin="5"
                                            Padding="0">


                                <StackLayout AbsoluteLayout.LayoutBounds="0.5,0,1,1" AbsoluteLayout.LayoutFlags="All" 
                                                 HorizontalOptions="FillAndExpand" BackgroundColor="White"
                                                 Orientation="Horizontal" Margin="25,2,5,2">
                                    <StackLayout HorizontalOptions="EndAndExpand" VerticalOptions="StartAndExpand" Margin="-10,5,10,0">
                                        <Label Text="{Binding Name}" HorizontalOptions="FillAndExpand" VerticalOptions="CenterAndExpand" />
                                        <Label Text="{Binding Location}" TextColor="Black" HorizontalOptions="FillAndExpand" VerticalOptions="EndAndExpand" />
                                    </StackLayout>
                                    <local:CustomButton 
                                            Text="FOLLOW"
                                            TextColor="White"
                                            HorizontalOptions="EndAndExpand"
                                            VerticalOptions="CenterAndExpand" 
                                            CustomBackgroundColor="#14C2F4"
                                            CustomBorderRadius="5"
                                            Padding="10,0,10,0"
                                            Margin="10,10,10,10"/>
                                </StackLayout>

                                <ci:CircleImage Source="{Binding ImageName}" Aspect="AspectFit"
                                                AbsoluteLayout.LayoutBounds="0,0,0.3,1"
                                                AbsoluteLayout.LayoutFlags="All"
                                                HorizontalOptions="StartAndExpand"
                                                BackgroundColor="Transparent"
                                                Margin="-10,0,0,0"
                                                VerticalOptions="CenterAndExpand"/>
                            </AbsoluteLayout>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </AbsoluteLayout>

        <Grid ColumnSpacing="0" RowSpacing="0" HorizontalOptions="FillAndExpand"
              RelativeLayout.YConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Height,Factor=1,Constant=-55}"
            RelativeLayout.XConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Width,Factor=0,Constant=0}"
            RelativeLayout.HeightConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Width,Factor=0,Constant=60}"
            RelativeLayout.WidthConstraint="{ConstraintExpression
                Type=RelativeToParent,Property=Width,Factor=1}">

            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>                    
            </Grid.ColumnDefinitions>

            <StackLayout x:Name="stack_Home" Spacing="0" Grid.Column="0" BackgroundColor="White">
                <Image x:Name="img_home" HeightRequest="30" Source="home_gray"/>
                <Label Text="Home" HorizontalOptions="Center"/>
                <StackLayout.GestureRecognizers>
                    <TapGestureRecognizer Tapped="Home_Tapped"/>
                </StackLayout.GestureRecognizers>
            </StackLayout>

            <StackLayout x:Name="stack_favorites" Spacing="0" Grid.Column="1" BackgroundColor="White">
                <Image x:Name="img_favorites" HeightRequest="30" Source="logo"/>
                <Label Text="Favorites" HorizontalOptions="Center"/>
                <StackLayout.GestureRecognizers>
                    <TapGestureRecognizer Tapped="Favorites_Tapped"/>
                </StackLayout.GestureRecognizers>
            </StackLayout>
        </Grid>
    </RelativeLayout>

请帮帮我。。