Flutter Listview Not Updating ontap method

Hello Friends Please help my Here i cant update my Listview.Builder When i click on my icons i got api new response but my listing is not updating please help me out ! what is the exact problem when i call my Flag ?? I can get response from my server i got listing ! what i need if data is print i need to change my listview.builder...if u have any idea plase help me

This is my api call

  Future<AllPhotoListing> Photolist() async {
  sharedPreferences = await SharedPreferences.getInstance();
  Map data = {
  "AccessToken": sharedPreferences.getString("AccessToken"),
  "CustomerId":  sharedPreferences.getInt("CustomerId"),
  "CampaignId": sharedPreferences.getInt("PhotographerCampaignId"),
  "Type" : widget.Type,
  "FilterType": Flag
  };
  print(data);

  final http.Response response = await http.post(
  Constants.CUSTOMER_WEBSERVICE_URL + "/photoslist",
  headers: <String, String>{
    'Content-Type': 'application/json; charset=UTF-8',
  },
  body: jsonEncode(data),
);
debugPrint(response.body);
if (response.statusCode == 200) {
  // If the server did return a 201 CREATED response,
  // then parse the JSON.
  print("Response status : ${response.statusCode}");
  print("Response status : ${response.body}");
  return AllPhotoListing.fromJson(json.decode(response.body));
} else {
  // If the server did not return a 201 CREATED response,
  // then throw an exception.
  throw Exception('Failed to load data');
  }
 }

here is my body part

      Scaffold(
      appBar: getAppBar(),
      body: Stack(
      children: <Widget>[
        (_futurePhotoList == null)
            ? Text("No data found. Please try again later.")
            : FutureBuilder<AllPhotoListing>(
          future: _futurePhotoList,
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              List<FolderList> items = snapshot.data.folderList;
              int Like = snapshot.data.totalLikes;
              int comment = snapshot.data.totalComments;
              int share = snapshot.data.totalShared;
              int album = snapshot.data.totalSelectedPhotosForAlbum;
              int totalcount = snapshot.data.totalPhotos;
             
              return  Form(
                key: _formKey,
                child: Stack(
                  children: <Widget>[
                   Positioned(
                        top: 2,
                        left: 1,
                        right: 3,
                        child: Container(
                          height: 50,
                          child: Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: <Widget>[
                              Padding(
                                padding: const EdgeInsets.all(4.0),
                                child: Text(widget.catogry,
                                    style: TextStyle(
                                      fontFamily: "Nunito",
                                      fontSize: 15,
                                      color: Colors.black,
                                    )
                                ),
                              ),
                              Padding(
                                padding: const EdgeInsets.only(left: 1),
                                child: Text("($totalcount)"),
                              ),
                                 Padding(
                                padding: EdgeInsets.only(left: 80,top: 5,bottom: 5),
                                child:  InkWell(
                                  onTap: (){
                               setState(() {
                                 Flag = "L";
                                 Photolist();
                                 print(Flag);
                                     // I cant update my Listview.builder From here
                               });
                                  },
                                  child: Column(
                                      children: <Widget>[
                                        Icon(Icons.thumb_up,color: Color(0xfff58634)),
                                        Text("$Like",
                                          style: TextStyle(color: Colors.black45,),),
                                      ]
                                  ),
                                ),
                              ),
                              Padding(
                                padding: EdgeInsets.only(left: 20,top: 5,bottom: 5),
                                child:  InkWell(
                                  onTap: (){
                                    setState(() {
                                      Flag = "C";
                                      Photolist();
                                      // I cant update my Listview.builder From here
                                    });
                                    print(Flag);
                                  },
                                  child: Column(
                                      children: <Widget>[
                                        Icon(Icons.chat_bubble,color: Color(0xfff58634)),
                                        Text("$comment",style: TextStyle(color: Colors.black45,),),
                                      ]
                                  ),
                                ),
                              ),
                              Padding(
                                padding: EdgeInsets.only(left: 20,top: 5,bottom: 5),
                                child:  InkWell(
                                  onTap: (){
                                    setState(() {
                                      Flag = "S";
                                      Photolist();
                                    // I cant update my Listview.builder From here
                                    });
                                    print(Flag);
                                  },
                                  child: Column(
                                      children: <Widget>[
                                        Icon(Icons.share,color: Color(0xfff58634)),
                                        Text("$share",style: TextStyle(color: Colors.black45,),),
                                      ]
                                  ),
                                ),
                              ),
                              Padding(
                                padding: EdgeInsets.only(left: 20,top: 5,bottom: 5),
                                child: InkWell(
                                    onTap: (){
                                      setState(() {
                                        Flag = "A";
                                        _isLoading = true;
                                        Photolist();
                                       // I cant update my Listview.builder From here
                                      });
                                    },
                                    child: Column(
                                        children: <Widget>[
                                          Icon(Icons.photo_album,color: Color(0xfff58634),),
                                          Text("$album",style: TextStyle(color: Colors.black45,),),
                                        ]
                                  ),
                                ),
                              )
                            ],
                          )
                        ),
                    ),
                    Padding(
                      padding: const EdgeInsets.only(top: 55),
                      child: DraggableScrollbar.semicircle(
                        alwaysVisibleScrollThumb: true,
                        controller: myScrollController,
                        child: ListView.builder(
                          controller: myScrollController,
                          itemCount: items.length,
                          itemBuilder: (context,index){
                            List<PhotoList> listing = items[index].photoList;
                            int totalcount = items[index].totalCount;
                            return Container(
                              decoration: new BoxDecoration(color: Colors.white12),
                              child: ExpansionTile(
                                initiallyExpanded: true,
                                trailing: Icon(Icons.arrow_drop_down, color: Colors.red),
                                title: Row(
                                  children: <Widget>[
                                    Text(
                                      "" + items[index].title,
                                      style: new TextStyle(
                                          fontSize: 18.0,
                                          fontWeight: FontWeight.w400,
                                          color: Colors.black),
                                    ),
                                    Padding(
                                      padding: const EdgeInsets.only(left: 10.0),
                                      child: Text(
                                         "($totalcount)",
                                        style: new TextStyle(
                                            fontSize: 15.0,
                                            fontWeight: FontWeight.w400,
                                            color: Colors.black45),
                                      ),
                                    ),
                                  ],
                                ),
                                children: <Widget>[
                                  Container(
                                    decoration: new BoxDecoration(color: Color(0xFFFFFFFF)),
                                    padding: EdgeInsets.all(2.0),
                                    child: StaggeredGridView.countBuilder(
                                      crossAxisCount: countValue,
                                      shrinkWrap: true,
                                      primary: false,
                                      crossAxisSpacing: 4,
                                      mainAxisSpacing: 4,
                                      itemCount: listing.length,
                                      itemBuilder: (context , int index)
                                      {
                                        if (_selectionMode) {
                                          return GridTile(
                                            header: GridTileBar(
                                              trailing: Icon(
                                                _selectedIndexList.contains(listing[index].photoId) ? Icons
                                                    .check_circle_outline : Icons
                                                    .radio_button_unchecked,
                                                color: _selectedIndexList.contains(listing[index].photoId) ? Colors
                                                    .green : Colors.black,
                                              ),
                                            ),
                                            child: GestureDetector(
                                              child: Container(
                                                decoration: BoxDecoration(
                                                  color: Colors.transparent,
                                                ),
                                                child: Image.network(listing[index].photoThumbnailImagePath,
                                                  height: 50,
                                                  width: 100,
                                                  fit: BoxFit.cover,
                                                ),
                                              ),
                                              onLongPress: () {
                                                setState(() {
                                                  _changeSelection(enable: false, index: index,listing: listing);
                                                });
                                              },
                                              onTap: () {
                                                setState(() {
                                                  if (_selectedIndexList.contains(listing[index].photoId)) {
                                                    _selectedIndexList.remove(listing[index].photoId);
                                                  } else {
                                                    //_selectedIndexList.add(index);
                                                    _selectedIndexList.add(listing[index].photoId);
                                                    print(_selectedIndexList);
                                                    //_changeSelection(enable: false, index: list[index].photoId);
                                                  }
                                                });
                                              },
                                            ),
                                          );
                                        }
                                        else
                                        {
                                          return GridTile(
                                            child: InkResponse(
                                              child: Image.network(listing[index].photoThumbnailImagePath,
                                                height: 50,
                                                width: 100,
                                                fit: BoxFit.cover,
                                                alignment: Alignment.center,
                                                loadingBuilder:(BuildContext context, Widget child,ImageChunkEvent loadingProgress) {
                                                  if (loadingProgress == null) return child;
                                                  return Center(
                                                    child: CircularProgressIndicator(
                                                      value: loadingProgress.expectedTotalBytes != null ?
                                                      loadingProgress.cumulativeBytesLoaded / loadingProgress.expectedTotalBytes
                                                          : null,
                                                    ),
                                                  );
                                                },
                                              ),
                                              onLongPress: () {
                                                setState(() {
                                                  _changeSelection(enable: true, index: index,listing: listing);
                                                });
                                              },
                                              onTap:(){
                                                setState(() {
                                                  Navigator.push(context, PageTransition(type: PageTransitionType.fade,
                                                      child:CampaignSinglePhotos(
                                                        currentindex: index,
                                                        ImageId: listing,
                                                        images: listing,
                                                      ),duration: Duration(milliseconds: 500)));
                                                });
                                              },
                                            ),
                                          );
                                        }
                                      },
                                      staggeredTileBuilder: (int index) => StaggeredTile.count(1, index.isEven ? liting : 1.3),
                                    ),
                                  )
                                ],
                              ),
                            );
                          },
                        ),
                      )
                    ),

                  ],
                ),
              );
            }
            else {
              return Center(child: CircularProgressIndicator()
              );
            }
          },
        ),
        Positioned(
            right: 13,
            bottom: 80,
            child: Center(
              child: InkWell(
                onTap: (){
                  changeMode();
                },
                child: CircleAvatar(
                  child: Icon(Icons.crop_free,color: Colors.red,),
                  backgroundColor: Colors.white,
                  maxRadius: 22,
                ),
              ),
            )
        ),
      ],
    ),
    );