How to Show a Bottom Sheet with Dropdown Options on Dropdown Click in Flutter

Dropdowns are a common UI element in mobile apps, allowing users to select options from a list. By default, Flutter provides the DropdownMenuItem widget to display options in a dropdown. However, if you want to create a more interactive and visually appealing dropdown experience, you can replace the DropdownMenuItem with a Bottom Sheet that shows all the options when the user clicks on the dropdown.

In this tutorial, we will guide you through the process of implementing a dropdown with a Bottom Sheet in Flutter. Let’s get started!

Step 1: Set up the Flutter Project

Before we begin, make sure you have a Flutter project set up and ready to go. If you haven’t done this yet, you can follow the official Flutter documentation to set up your development environment.

Step 2: Import the Required Flutter Packages

In your Flutter project, open the pubspec.yaml file and add the following packages to your dependencies:

code



dependencies:
  flutter:
    sdk: flutter
  flutter/cupertino.dart

Save the file, and then run flutter pub get in your terminal to fetch the packages.

Step 3: Implement the Dropdown with a Bottom Sheet

Now let’s implement the dropdown with a Bottom Sheet. We will create a stateful widget called ModalDropDown that encapsulates the functionality.

code






















































import 'package:flutter/material.dart';

class ModalDropDown extends StatefulWidget {
  @override
  _ModalDropDownState createState() => _ModalDropDownState();
}

class _ModalDropDownState extends State<ModalDropDown> {
  String _selected = '';
  List<String> _options = ['Option 1', 'Option 2', 'Option 3', 'Option 4'] 





;

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
        children: 










[
          ListTile(
            title: Text('Dropdown'),
            onTap: () {
              showModalBottomSheet(
                context: context,
                builder: (BuildContext context) {
                  return ListView.builder(
                    itemCount: _options.length,
                    itemBuilder: (BuildContext context, int index) {
                      return ListTile(
                        title: Text(_options[index] 


),
                        onTap: () {
                          setState(() {
                            _selected = _options[index] 















;
                          });
                          Navigator.pop(context);
                        },
                      );
                    },
                  );
                },
              );
            },
          ),
          Text('Selected Option: $_selected'),
        ],
      ),
    );
  }
}

In the code above, we create a ModalDropDown widget that displays a ListTile. When the user taps on the ListTile, a Bottom Sheet is displayed using the showModalBottomSheet method. The Bottom Sheet contains a ListView.builder that shows all the options. When the user selects an option, the _selected variable is updated, and the Bottom Sheet is dismissed.

Step 4: Implement the Dropdown in Your App

To use the ModalDropDown widget in your app, simply add it to your desired screen or widget. For example:

dartCopy code














import 'package:flutter/material.dart';

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Dropdown with Bottom Sheet'),
      ),
      body: Center(
        child: ModalDropDown(),
      ),
    );
  }
}

Step 5: Run Your Flutter App

Now it’s time to run your Flutter app and see the dropdown with the Bottom Sheet in action. Open your terminal and run the following command:

code
flutter run

Wait for the app to build and launch on your connected device or emulator. You should see the dropdown on the screen. When you tap on it, the Bottom Sheet will appear with all the options. Selecting an option will update the selected option text accordingly.

Congratulations! You have successfully implemented a dropdown with a Bottom Sheet in your Flutter app.

Conclusion

In this tutorial, you learned how to enhance your Flutter app by replacing the default DropdownMenuItem with a Bottom Sheet that displays all the options when the user clicks on the dropdown. This customization allows for a more interactive and visually appealing user experience. By following the step-by-step guide, you can easily implement this feature in your Flutter app and provide a seamless dropdown selection process for your users.

Remember to experiment with different UI designs and styles to match your app’s overall theme. With Flutter’s flexible and powerful widgets, the possibilities are endless. Happy coding!

That’s it for this tutorial. If you have any questions or feedback, feel free to leave a comment below.