Create a TabBar View in flutter with fully functional stepwise

To create a TabBar view in Flutter where each tab displays different content and the tab’s color and text color change when selected, you can follow these steps. We’ll implement three tabs and customize their appearance and behavior.

Step-by-Step Guide to Creating a TabBar View in Flutter

Step 1: Set Up Your Flutter Project

First, make sure you have Flutter installed, and then create a new Flutter project:

bashCopy codeflutter create tabbar_example
cd tabbar_example

Step 2: Update Dependencies (Optional)

For this example, we are using Flutter’s built-in widgets and do not need additional dependencies, so no changes are needed in the pubspec.yaml.

Step 3: Implement the TabBar in main.dart

Edit the lib/main.dart file to implement the TabBar and TabBarView. Here’s how to set it up:

To display a list of data in the first tab that includes an image and text name in each row, we’ll modify the existing code by adding a ListView to the first tab’s content. Each item in the ListView will have an image and text arranged in a Row widget. We will also include a total count of the list items at the top of the tab.

Here’s how you can modify the main.dart code to implement this:

Step-by-Step Code Modification to Display a List with Images and Text

1. Add Sample Data

Let’s add some sample data for the list. You can create a simple model for the data items that contain an image URL and a name.

class Item {
  final String imageUrl;
  final String name;

  Item(this.imageUrl, this.name);
}

// Sample data
final List<Item> items = List.generate(
  10,
  (index) => Item(
    'https://via.placeholder.com/150', // Sample image URL
    'Item ${index + 1}',
  ),
);

2. Modify the First Tab to Display a List

Update the _buildTabContent method to handle the list of items for the first tab. We’ll create a separate widget function to build the list view.

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'TabBar Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: TabBarExample(),
    );
  }
}

class TabBarExample extends StatefulWidget {
  @override
  _TabBarExampleState createState() => _TabBarExampleState();
}

class _TabBarExampleState extends State<TabBarExample> with SingleTickerProviderStateMixin {
  late TabController _tabController; // Initialize the tab controller

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this); // Set up the TabController with 3 tabs
  }

  @override
  void dispose() {
    _tabController.dispose(); // Dispose the controller when the widget is disposed
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('TabBar Example'),
        bottom: TabBar(
          controller: _tabController,
          indicatorColor: Colors.black, // Set the bottom border color to black
          labelColor: Colors.black, // Set the selected tab text color to black
          unselectedLabelColor: Colors.grey, // Set the unselected tab text color to grey
          tabs: [
            Tab(text: 'Tab 1'),
            Tab(text: 'Tab 2'),
            Tab(text: 'Tab 3'),
          ],
          onTap: (index) {
            setState(() {
              _tabController.index = index; // Changes the tab index on tap
            });
          },
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: [
          _buildListTab(), // Use a separate method to build the list for Tab 1
          _buildTabContent('Content for Tab 2', Colors.green),
          _buildTabContent('Content for Tab 3', Colors.blue),
        ],
      ),
    );
  }

  // Method to build list for Tab 1
  Widget _buildListTab() {
    return Column(
      children: [
        Padding(
          padding: const EdgeInsets.all(16.0),
          child: Text(
            'Total Items: ${items.length}', // Display the total count of items
            style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
          ),
        ),
        Expanded(
          child: ListView.builder(
            itemCount: items.length,
            itemBuilder: (context, index) {
              return ListTile(
                leading: Image.network(items[index].imageUrl), // Display the image
                title: Text(items[index].name), // Display the text
              );
            },
          ),
        ),
      ],
    );
  }

  // Reuse the _buildTabContent method for Tabs 2 and 3
  Widget _buildTabContent(String text, Color color) {
    return Container(
      color: color,
      child: Center(
        child: Text(
          text,
          style: TextStyle(fontSize: 24, color: Colors.white),
        ),
      ),
    );
  }
}

// Sample item data model
class Item {
  final String imageUrl;
  final String name;

  Item(this.imageUrl, this.name);
}

// Sample data for the list
final List<Item> items = List.generate(
  10,
  (index) => Item(
    'https://via.placeholder.com/150', // Placeholder image URL
    'Item ${index + 1}',
  ),
);

Output

Explanation of Key Changes

1. Data Model (Item):

• Created a simple Item class that has an imageUrl and name to represent each list item.

1. Sample Data (items List):

• Generated a sample list of Item objects with placeholder images and names.

1. Custom Tab 1 Content:

• Used the _buildListTab method to create a custom layout for the first tab. This layout includes:
  • A Text widget at the top to display the total number of items.
  • An Expanded widget with a ListView.builder to create a scrollable list of items.
• ListTile is used to display each item in the list with an image (leading) and a text name (title).

1. Reused _buildTabContent for Other Tabs:

• The _buildTabContent function is used for the second and third tabs, maintaining the same content as before. TabBar View in flutter

Step-by-Step Guide to Run the App

1. Save the Code: Make sure to save the changes to main.dart.
2. Run the App: Use the following command to run the app on a connected device or emulator:

   flutter run

What to Expect

When you run the app, the first tab will display a list of 10 items, each with an image and a name. The total count of items will be displayed at the top. Clicking the other tabs will display the content specified for each tab. The selected tab’s text color and the bottom border color will be black, and the unselected tab’s text color will be grey, as per the requirements.

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