Flutter Switch – Active Thumb Image

Active Thumb Image for Switch

Flutter Active Thumb Image is the image used to display in the thumb area of the Switch when the Switch is in ON state.

To set a specific image for the Switch’s thumb, when the Switch is ON/active, set activeThumbImage of Switch with the required ImageProvider object.

Code Snippet

Switch(
  activeThumbImage: Image.network('url').image,
),

Example

In the following example, we shall implement a Switch widget with active thumb image set to an image from the network.

main.dart

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

/// main application widget
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Application';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}

/// stateful widget that the main application instantiates
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

/// private State class that goes with MyStatefulWidget
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  bool isSwitched = false;
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        children: <Widget>[
          Padding(
            padding: const EdgeInsets.all(50.0),
            child: Switch(
              activeThumbImage: Image.network('https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Apple_logo_black.svg/256px-Apple_logo_black.svg.png').image,
              activeColor: Colors.amber,
              value: isSwitched,
              onChanged: (value) {
                setState(() {
                  isSwitched = value;
                });
              },
            ),
          ),
        ],
      ),
    );
  }
}

iPhone Screenshot

Summary

In this Flutter Tutorial, we learned how to set image for Switch widget’s thumb area when the state of the Switch is active.