Create a reorderable listview in Flutter

ReorderableListView() is a built-in widget in the flutter that enables the user to change the order of the items placed in the ListView through a long tap and drag.

A reminder app or a task manager app would be the perfect example of this. These apps usually provide reorder or sort functionalities. As in these apps, the user needs to be able to arrange/sort items based on his/her preferences or order priority.

This is pretty easy to implement in the flutter. So, let’s check how to implement Reorderable ListView in Flutter.

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Step 1: Create a flutter project.

Step 2: First, we will create a list that has data. So, we will create a list of strings and names as tasks.

List<String> tasks = ["A Task", "B Task", "C Task", "D Task", "E Task",
  "F Task","G Task","H Task"];

1 2	List<String> tasks = ["A Task", "B Task", "C Task", "D Task", "E Task", "F Task","G Task","H Task"];

Step 3: Add the ReorderableListView() widget and add the key in the children of the ReorderableListView widget. The key is expected to distinguish the items after their position is changed.

 Container(padding: const EdgeInsets.all(8.0), child:
        ReorderableListView(
        children: [
          for(final task in tasks) Card(color: Colors.lightBlueAccent.shade100,
            key: ValueKey(task),
            elevation: 5.0,
            child: ListTile(title: Text(task),
              leading: const Icon(Icons.work, color: Colors.black),),),
        ],))

Container(padding: const EdgeInsets.all(8.0), child:

ReorderableListView(

children: [

for(final task in tasks) Card(color: Colors.lightBlueAccent.shade100,

key: ValueKey(task),

elevation: 5.0,

child: ListTile(title: Text(task),

leading: const Icon(Icons.work, color: Colors.black),),),

],))

Step 4: Add the reorder function. It is a callback function used by the list to report that a list item has been dragged to a new location in the list and the application should update the order of the items.

onReorder:(oldIndex,newIndex ){
            setState(() {
              if(newIndex > oldIndex){
                newIndex = newIndex-1;
              }
            });
            final task = tasks.removeAt(oldIndex);
            tasks.insert(newIndex, task);
          }