Working with Lists and Grids in Flutter

 Flutter, Google’s UI toolkit, allows developers to build visually appealing and responsive apps for multiple platforms from a single codebase. One of the most common UI requirements is displaying data in a list or grid format. Flutter offers powerful widgets like ListView and GridView to easily manage and render large sets of items efficiently.

Using ListView in Flutter

ListView is used to display items in a scrollable list. It comes in various forms:

ListView() Constructor

This is ideal for short, fixed lists.

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ListView(

  children: <Widget>[

    ListTile(title: Text('Item 1')),

    ListTile(title: Text('Item 2')),

    ListTile(title: Text('Item 3')),

  ],

)

ListView.builder()

For long or dynamic lists, ListView.builder() is efficient because it builds items on demand.

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ListView.builder(

  itemCount: items.length,

  itemBuilder: (context, index) {

    return ListTile(

      title: Text(items[index]),

    );

  },

)

ListView.separated()

Use this when you want separators (like dividers) between list items.

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ListView.separated(

  itemCount: items.length,

  itemBuilder: (context, index) => ListTile(title: Text(items[index])),

  separatorBuilder: (context, index) => Divider(),

)

Using GridView in Flutter

GridView is ideal for displaying content in a two-dimensional grid, such as a gallery or product list.

GridView.count()

This method sets a fixed number of columns.

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GridView.count(

  crossAxisCount: 2,

  children: List.generate(6, (index) {

    return Center(

      child: Text(

        'Item $index',

        style: TextStyle(fontSize: 18),

      ),

    );

  }),

)

GridView.builder()

More flexible and performance-optimized for large data sets.

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GridView.builder(

  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(

    crossAxisCount: 2,

  ),

  itemCount: items.length,

  itemBuilder: (context, index) {

    return Card(

      child: Center(child: Text(items[index])),

    );

  },

)

When to Use List vs Grid

ListView is best for textual data or vertically scrolling content.

GridView is suitable for image galleries or when you want content in rows and columns.

Conclusion

Lists and grids are fundamental to app UI. Flutter makes it easy to implement them efficiently using ListView and GridView. With just a few lines of code, you can build highly responsive and scrollable layouts that enhance user experience across devices.

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Read More:

Stateful vs Stateless Widgets in Flutter Explained

Flutter Layout Basics: Rows, Columns, and Containers

Building Responsive UI in Flutter for Multiple Screen Sizes

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