Root folderName

[ThePunisher569]

I'm trying to access the root folder name which is '/storage/emulated/0' but the foldername field in json array for is null and the following error was thrown:

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following assertion was thrown building Builder(dirty):
A non-null String must be provided to a Text widget.
'package:flutter/src/widgets/text.dart':
Failed assertion: line 360 pos 10: 'data != null'

The relevant error-causing widget was:
Builder file:///C:/Users/Aatif/AndroidStudioProjects/gallery_app/lib/main.dart:59:32
When the exception was thrown, this was the stack:
#2 new Text (package:flutter/src/widgets/text.dart:360:10)
#3 _HomeState.build.. (package:gallery_app/main.dart:66:36)
#4 Builder.build (package:flutter/src/widgets/basic.dart:7166:48)
#5 StatelessElement.build (package:flutter/src/widgets/framework.dart:4631:28)
#6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4557:15)
...

JSON array:
**_{files: [/storage/emulated/0/IMG_20160709_181323981.jpg]}, {files: [/storage/emulated/0/IMG_20160709_174128028.jpg]}_**, {files: [/storage/emulated/0/timetable/IMG-20200107-WA0002.jpg], folderName: timetable}, {files: [/storage/emulated/0/Fake Tweets/Image-6156.jpg, /storage/emulated/0/Fake Tweets/Image-3012.jpg, /storage/emulated/0/Fake Tweets/IMG_20180703_141329.jpg], folderName: Fake Tweets},

as you can see there's no folderName field.

[mohitjadav86]

Hope This one can help.
https://stackoverflow.com/a/56353311

[ThePunisher569]

Hope This one can help.
https://stackoverflow.com/a/56353311

I've filtered the list of images which are in root folder and added folderName

      _imagesPath = await StoragePath.imagesPath;
      //images list with files and folder name

      var imagesList = jsonDecode(_imagesPath) as List;

      //root folderName handling********************
      Map<String,dynamic> rootObject = {'files':[],'folderName':'0'};
      for(Map<String,dynamic> a in imagesList){
        if (a['folderName']==null){
          a['folderName'] = '0';
          rootObject['files']=rootObject['files']+a['files'];
        }
      }
      imagesList.removeWhere((element) => element['folderName']=='0');
      imagesList.insert(0,rootObject);
      //***********************