How to check battery status with battery plus flutter package

dependencies:
  flutter:
    sdk: flutter
  battery_plus: ^2.0.0

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

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

class MyApp extends StatelessWidget {
  final Battery battery = Battery();
  
  // ...
}

class MyApp extends StatelessWidget {
  final Battery battery = Battery();

  Future<int> fetchBatteryLevel() async {
    final int batteryLevel = await battery.batteryLevel;
    print('Battery level: $batteryLevel%');
    return batteryLevel;
  }

  // ...
}

class MyApp extends StatelessWidget {
  final Battery battery = Battery();

  Future<BatteryState> checkBatteryState() async {
    final BatteryState batteryState = await battery.batteryState;
    print('Battery state: $batteryState');
    return batteryState;
  }

  // ...
}

class MyApp extends StatelessWidget {
  final Battery battery = Battery();

  Future<int> fetchBatteryLevel() async {
    final int batteryLevel = await battery.batteryLevel;
    print('Battery level: $batteryLevel%');
    return batteryLevel;
  }

  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Battery Status'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              ElevatedButton(
                onPressed: () async {
                  final batteryLevel = await fetchBatteryLevel();
                  final batteryState = await checkBatteryState();

                  // Update UI with batteryLevel and batteryState
                },
                child: Text('Fetch Battery Info'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

StreamSubscription<BatteryState> batteryStateSubscription;

void subscribeToBatteryStateChanges() {
  batteryStateSubscription = battery.onBatteryStateChanged.listen((BatteryState state) {
    print('Battery state changed: $state');
  });
}

void unsubscribeFromBatteryStateChanges() {
  batteryStateSubscription.cancel();
}

Future<void> performTaskBasedOnBatteryLevel() async {
  final int batteryLevel = await battery.batteryLevel;

  if (batteryLevel > 20) {
    // Perform energy-intensive task
  } else {
    // Optimize for low battery level
  }
}

class BatteryIndicator extends StatelessWidget {
  final int batteryLevel;

  BatteryIndicator(this.batteryLevel);

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Icon(Icons.battery_full),
        SizedBox(width: 5),
        Text('$batteryLevel%'),
      ],
    );
  }
}