How To Hide Show Password Icon Input Field Using Flutter

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => MyHomePageState();
}

class MyHomePageState extends State<MyHomePage> {
  bool passwordVisible = false;

  @override
  void initState() {
    passwordVisible = false;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.blue[900],
        title: Text("Hide Show Password Icon Input Field"),
      ),
      body: Column(
        children: <Widget>[
          _buildPasswordTextField(),
        ],
      ),
    );
  }

  Widget _buildPasswordTextField() {
    return Padding(
      padding: const EdgeInsets.all(15.0),
      child: Container(
        child: TextFormField(
          keyboardType: TextInputType.text,
          obscureText: passwordVisible,
          decoration: InputDecoration(
            labelText: 'Password',
            hintText: 'Enter your password',
            // Here is key idea
            suffixIcon: IconButton(
              icon: Icon(
                passwordVisible
                    ? Icons.visibility
                    : Icons.visibility_off,
                color: Theme.of(context).primaryColorDark,
              ),
              onPressed: () {
                setState(() {
                  passwordVisible = !passwordVisible;
                });
              },
            ),
          ),
        ),
      ),
    );
  }
}