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Flutter plugin for accessing information about the battery state(full, charging, discharging).

example/lib/main.dart

// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// ignore_for_file: public_member_api_docs

import 'dart:async';

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, this.title}) : super(key: key);

  final String? title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final Battery _battery = Battery();

  BatteryState? _batteryState;
  StreamSubscription<BatteryState>? _batteryStateSubscription;

  @override
  void initState() {
    super.initState();
    _battery.batteryState.then(_updateBatteryState);
    _batteryStateSubscription =
        _battery.onBatteryStateChanged.listen(_updateBatteryState);
  }

  void _updateBatteryState(BatteryState state) {
    if (_batteryState == state) return;
    setState(() {
      _batteryState = state;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Plugin example app'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('$_batteryState'),
            ElevatedButton(
              onPressed: () async {
                final batteryLevel = await _battery.batteryLevel;
                // ignore: unawaited_futures
                showDialog<void>(
                  context: context,
                  builder: (_) => AlertDialog(
                    content: Text('Battery: $batteryLevel%'),
                    actions: <Widget>[
                      TextButton(
                        onPressed: () {
                          Navigator.pop(context);
                        },
                        child: const Text('OK'),
                      )
                    ],
                  ),
                );
              },
              child: const Text('Get battery level'),
            ),
            ElevatedButton(
                onPressed: () async {
                  final isInPowerSaveMode = await _battery.isInBatterySaveMode;
                  // ignore: unawaited_futures
                  showDialog<void>(
                    context: context,
                    builder: (_) => AlertDialog(
                      content: Text('Is on low power mode: $isInPowerSaveMode'),
                      actions: <Widget>[
                        TextButton(
                          onPressed: () {
                            Navigator.pop(context);
                          },
                          child: const Text('OK'),
                        )
                      ],
                    ),
                  );
                },
                child: const Text('Is on low power mode'))
          ],
        ),
      ),
    );
  }

  @override
  void dispose() {
    super.dispose();
    if (_batteryStateSubscription != null) {
      _batteryStateSubscription!.cancel();
    }
  }
}