How To Add Color Picker In Flutter Android App

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_colorpicker: ^0.3.4

flutter pub get

import 'package:flutter_colorpicker/flutter_colorpicker.dart';

import 'package:flutter/material.dart';
import 'package:flutter_colorpicker/flutter_colorpicker.dart';

void main() {
  runApp(MaterialApp(
    debugShowCheckedModeBanner: false,
      home: MyApp(
      )));
}

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool lightTheme = true;
  Color currentColor = Colors.limeAccent;

  void changeColor(Color color) => setState(() => currentColor = color);

  @override
  Widget build(BuildContext context) {
    return Theme(
      data: lightTheme ? ThemeData.light() : ThemeData.dark(),
      child: DefaultTabController(
        length: 3,
        child: Scaffold(
          appBar: AppBar(
            centerTitle: true,
            backgroundColor: Colors.orangeAccent,
            title: GestureDetector(
              child: Text('Color Picker'),
              onDoubleTap: () => setState(() => lightTheme = !lightTheme),
            ),
            bottom: TabBar(
              tabs: <Widget>[
                const Tab(text: 'HSV'),
                const Tab(text: 'Material'),
                const Tab(text: 'Block'),
              ],
            ),
          ),
          body: TabBarView(
            physics: const NeverScrollableScrollPhysics(),
            children: <Widget>[
              Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  RaisedButton(
                    elevation: 3.0,
                    onPressed: () {
                      showDialog(
                        context: context,
                        builder: (BuildContext context) {
                          return AlertDialog(
                            titlePadding: const EdgeInsets.all(0.0),
                            contentPadding: const EdgeInsets.all(0.0),
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(25.0),
                            ),
                            content: SingleChildScrollView(
                              child: SlidePicker(
                                pickerColor: currentColor,
                                onColorChanged: changeColor,
                                paletteType: PaletteType.rgb,
                                enableAlpha: false,
                                displayThumbColor: true,
                                showLabel: false,
                                showIndicator: true,
                                indicatorBorderRadius:
                                const BorderRadius.vertical(
                                  top: const Radius.circular(25.0),
                                ),
                              ),
                            ),
                          );
                        },
                      );
                    },
                    child: const Text('Change Button Color'),
                    color: currentColor,
                    textColor: useWhiteForeground(currentColor)
                        ? const Color(0xffffffff)
                        : const Color(0xff000000),
                  ),
                ],
              ),
              Center(
                child: RaisedButton(
                  elevation: 3.0,
                  onPressed: () {
                    showDialog(
                      context: context,
                      builder: (BuildContext context) {
                        return AlertDialog(
                          titlePadding: const EdgeInsets.all(0.0),
                          contentPadding: const EdgeInsets.all(0.0),
                          content: SingleChildScrollView(
                            child: MaterialPicker(
                              pickerColor: currentColor,
                              onColorChanged: changeColor,
                              enableLabel: true,
                            ),
                          ),
                        );
                      },
                    );
                  },
                  child: const Text('Change Button Color'),
                  color: currentColor,
                  textColor: useWhiteForeground(currentColor)
                      ? const Color(0xffffffff)
                      : const Color(0xff000000),
                ),
              ),
              Center(
                child: RaisedButton(
                  elevation: 3.0,
                  onPressed: () {
                    showDialog(
                      context: context,
                      builder: (BuildContext context) {
                        return AlertDialog(
                          title: Text('Select Color'),
                          content: SingleChildScrollView(
                            child: BlockPicker(
                              pickerColor: currentColor,
                              onColorChanged: changeColor,
                            ),
                          ),
                        );
                      },
                    );
                  },
                  child: const Text('Change me'),
                  color: currentColor,
                  textColor: useWhiteForeground(currentColor)
                      ? const Color(0xffffffff)
                      : const Color(0xff000000),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}