Flutter电池信息获取插件battery_plus_ohos的使用

battery_plus_ohos 是一个用于在 OpenHarmony 平台上获取电池状态（如是否充满、正在充电或正在放电）的 Flutter 插件。

使用

首先，在 pubspec.yaml 文件中添加依赖项：

dependencies:
  battery_plus: 5.0.3
  battery_plus_ohos: any

然后，您可以使用以下代码来获取电池信息。

示例代码

// 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.
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({super.key});

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        useMaterial3: true,
        colorSchemeSeed: const Color(0x9f4376f8),
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  [@override](/user/override)
  State<MyHomePage> createState() => _MyHomePageState();
}

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

  BatteryState? _batteryState;
  StreamSubscription<BatteryState>? _batteryStateSubscription;

  [@override](/user/override)
  void initState() {
    super.initState();
    // 获取当前电池状态
    _battery.batteryState.then(_updateBatteryState);
    // 监听电池状态变化
    _batteryStateSubscription =
        _battery.onBatteryStateChanged.listen(_updateBatteryState);
  }

  void _updateBatteryState(BatteryState state) {
    if (_batteryState == state) return;
    // 更新 UI 状态
    setState(() {
      _batteryState = state;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('电池插件示例应用'),
        elevation: 4,
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            // 显示电池状态
            Text(
              '$_batteryState',
              style: const TextStyle(fontSize: 24),
            ),
            const SizedBox(height: 24),
            // 按钮用于获取电池电量
            ElevatedButton(
              onPressed: () {
                _battery.batteryLevel.then(
                  (batteryLevel) {
                    showDialog<void>(
                      context: context,
                      builder: (_) => AlertDialog(
                        content: Text('电量: $batteryLevel%'),
                        actions: <Widget>[
                          TextButton(
                            onPressed: () {
                              Navigator.pop(context);
                            },
                            child: const Text('确定'),
                          )
                        ],
                      ),
                    );
                  },
                );
              },
              child: const Text('获取电池电量'),
            ),
            const SizedBox(height: 24),
            // 按钮用于检查是否处于省电模式
            ElevatedButton(
              onPressed: () {
                _battery.isInBatterySaveMode.then(
                  (isInPowerSaveMode) {
                    showDialog<void>(
                      context: context,
                      builder: (_) => AlertDialog(
                        title: const Text(
                          '是否处于省电模式？',
                          style: TextStyle(fontSize: 20),
                        ),
                        content: Text(
                          "$isInPowerSaveMode",
                          style: const TextStyle(fontSize: 18),
                        ),
                        actions: <Widget>[
                          TextButton(
                            onPressed: () {
                              Navigator.pop(context);
                            },
                            child: const Text('关闭'),
                          )
                        ],
                      ),
                    );
                  },
                );
              },
              child: const Text('是否处于省电模式？'),
            )
          ],
        ),
      ),
    );
  }

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

代码说明

• 初始化：

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

  初始化时，我们获取当前的电池状态，并设置监听器以实时更新电池状态。

• 更新UI：

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

  当电池状态发生变化时，更新UI以反映新的电池状态。

• 获取电池电量：

  _battery.batteryLevel.then(
    (batteryLevel) {
      showDialog<void>(
        context: context,
        builder: (_) => AlertDialog(
          content: Text('电量: $batteryLevel%'),
          actions: <Widget>[
            TextButton(
              onPressed: () {
                Navigator.pop(context);
              },
              child: const Text('确定'),
            )
          ],
        ),
      );
    },
  );
  

  通过调用 _battery.batteryLevel 方法，可以获取当前的电池电量，并通过对话框显示结果。

• 检查是否处于省电模式：

  _battery.isInBatterySaveMode.then(
    (isInPowerSaveMode) {
      showDialog<void>(
        context: context,
        builder: (_) => AlertDialog(
          title: const Text(
            '是否处于省电模式？',
            style: TextStyle(fontSize: 20),
          ),
          content: Text(
            "$isInPowerSaveMode",
            style: const TextStyle(fontSize: 18),
          ),
          actions: <Widget>[
            TextButton(
              onPressed: () {
                Navigator.pop(context);
              },
              child: const Text('关闭'),
            )
          ],
        ),
      );
    },
  );