Flutter资源监控插件resource_monitor的使用
Flutter资源监控插件resource_monitor的使用
resource_monitor
是一个用于在Android和iOS设备上监控CPU和内存使用的Flutter插件。本文将详细介绍如何使用该插件,并提供一个完整的示例Demo。
功能概述
- CPU和内存使用情况:监控应用的CPU和内存使用情况。
- 实时数据:通过定时器定期获取最新的资源使用情况。
- 峰值记录:记录应用运行过程中的CPU和内存使用峰值。
TODO
- ❌ 返回系统整体的CPU和内存使用情况。
- ❌ 实现Android端的插件功能。
- ❌ 添加Android和iOS的监听支持(EventChannel)。
- ❌ 更新README.md文档。
示例代码
以下是一个完整的示例代码,展示了如何使用 resource_monitor
插件来监控应用的CPU和内存使用情况。
示例代码
import 'dart:math';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:resource_monitor/resource_monitor.dart';
void main() => runApp(const MyApp());
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
Resource? _data;
static const double _defaultValue = 0.0;
double _appCpuUsagePeak = _defaultValue, _appMemoryUsagePeak = _defaultValue;
Timer? timer;
[@override](/user/override)
void initState() {
super.initState();
timer = Timer.periodic(const Duration(seconds: 1), (Timer t) => _getResource());
}
[@override](/user/override)
void dispose() {
timer?.cancel();
super.dispose();
}
Future<void> _getResource() async {
try {
final data = await ResourceMonitor.getResourceUsage;
_appCpuUsagePeak = data.cpuInUseByApp > _appCpuUsagePeak
? data.cpuInUseByApp
: _appCpuUsagePeak;
_appMemoryUsagePeak = data.memoryInUseByApp > _appMemoryUsagePeak
? data.memoryInUseByApp
: _appMemoryUsagePeak;
setState(() => _data = data);
} on PlatformException {
throw PlatformException(
code: 'Unknow-error', message: 'getResourceUsage');
}
}
[@override](/user/override)
Widget build(BuildContext context) => MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Plugin example app')),
body: Center(
child: _data != null
? Table(
defaultColumnWidth: const FixedColumnWidth(120.0),
border: TableBorder.all(
color: Colors.black,
style: BorderStyle.solid,
width: 2),
children: [
TableRow(children: [
Column(children: const [
Text('Resource', style: TextStyle(fontSize: 20.0))
]),
Column(children: const [
Text('App', style: TextStyle(fontSize: 20.0))
])
]),
TableRow(children: [
Column(children: const [Text('RAM - Live')]),
Column(children: [
Text(formatBytes(_data!.memoryInUseByApp.toInt(), 2))
])
]),
TableRow(children: [
Column(children: const [Text('CPU - Live')]),
Column(children: [
Text('${_data?.cpuInUseByApp.floorToDouble()} %')
])
]),
TableRow(children: [
Column(children: const [Text('RAM - Peak')]),
Column(children: [
Text(formatBytes(_appMemoryUsagePeak.toInt(), 2))
])
]),
TableRow(children: [
Column(children: const [Text('CPU - Peak')]),
Column(children: [Text('$_appCpuUsagePeak')]),
])
])
: const CircularProgressIndicator()),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.memory), onPressed: _getResource)));
}
String formatBytes(int bytes, int decimals) {
if (bytes <= 0) return "0 B";
const suffixes = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
var i = (log(bytes) / log(1024)).floor();
return ((bytes / pow(1024, i)).toStringAsFixed(decimals)) + ' ' + suffixes[i];
}
代码说明
-
导入依赖:
import 'dart:math'; import 'package:flutter/material.dart'; import 'dart:async'; import 'package:flutter/services.dart'; import 'package:resource_monitor/resource_monitor.dart';
-
初始化状态:
class _MyAppState extends State<MyApp> { Resource? _data; static const double _defaultValue = 0.0; double _appCpuUsagePeak = _defaultValue, _appMemoryUsagePeak = _defaultValue; Timer? timer; [@override](/user/override) void initState() { super.initState(); timer = Timer.periodic(const Duration(seconds: 1), (Timer t) => _getResource()); } [@override](/user/override) void dispose() { timer?.cancel(); super.dispose(); }
-
获取资源使用情况:
Future<void> _getResource() async { try { final data = await ResourceMonitor.getResourceUsage; _appCpuUsagePeak = data.cpuInUseByApp > _appCpuUsagePeak ? data.cpuInUseByApp : _appCpuUsagePeak; _appMemoryUsagePeak = data.memoryInUseByApp > _appMemoryUsagePeak ? data.memoryInUseByApp : _appMemoryUsagePeak; setState(() => _data = data); } on PlatformException { throw PlatformException( code: 'Unknow-error', message: 'getResourceUsage'); } }
-
构建UI:
[@override](/user/override) Widget build(BuildContext context) => MaterialApp( home: Scaffold( appBar: AppBar(title: const Text('Plugin example app')), body: Center( child: _data != null ? Table( defaultColumnWidth: const FixedColumnWidth(120.0), border: TableBorder.all( color: Colors.black, style: BorderStyle.solid, width: 2), children: [ TableRow(children: [ Column(children: const [ Text('Resource', style: TextStyle(fontSize: 20.0)) ]), Column(children: const [ Text('App', style: TextStyle(fontSize: 20.0)) ]) ]), TableRow(children: [ Column(children: const [Text('RAM - Live')]), Column(children: [ Text(formatBytes(_data!.memoryInUseByApp.toInt(), 2)) ]) ]), TableRow(children: [ Column(children: const [Text('CPU - Live')]), Column(children: [ Text('${_data?.cpuInUseByApp.floorToDouble()} %') ]) ]), TableRow(children: [ Column(children: const [Text('RAM - Peak')]), Column(children: [ Text(formatBytes(_appMemoryUsagePeak.toInt(), 2)) ]) ]), TableRow(children: [ Column(children: const [Text('CPU - Peak')]), Column(children: [Text('$_appCpuUsagePeak')]), ]) ]) : const CircularProgressIndicator()), floatingActionButton: FloatingActionButton( child: const Icon(Icons.memory), onPressed: _getResource)));
-
格式化字节:
String formatBytes(int bytes, int decimals) { if (bytes <= 0) return "0 B"; const suffixes = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]; var i = (log(bytes) / log(1024)).floor(); return ((bytes / pow(1024, i)).toStringAsFixed(decimals)) + ' ' + suffixes[i]; }
贡献
欢迎提交Pull Request。对于重大更改,请先创建一个Issue进行讨论。
请确保在适当的情况下更新测试用例。
许可证
MIT License - 查看许可证
希望这个示例能帮助你更好地理解和使用 resource_monitor
插件。如果有任何问题或建议,欢迎随时提出。
更多关于Flutter资源监控插件resource_monitor的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter资源监控插件resource_monitor的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,下面是一个关于如何使用Flutter资源监控插件resource_monitor
的代码案例。这个插件允许你监控设备的CPU、内存使用情况以及电池状态等。
首先,你需要在pubspec.yaml
文件中添加resource_monitor
依赖:
dependencies:
flutter:
sdk: flutter
resource_monitor: ^latest_version # 请替换为实际的最新版本号
然后,运行flutter pub get
来获取依赖。
接下来,在你的Flutter应用中,你可以按照以下方式使用resource_monitor
插件:
import 'package:flutter/material.dart';
import 'package:resource_monitor/resource_monitor.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late ResourceMonitor _resourceMonitor;
late StreamSubscription<CpuUsageData> _cpuSubscription;
late StreamSubscription<MemoryUsageData> _memorySubscription;
late StreamSubscription<BatteryStatusData> _batterySubscription;
@override
void initState() {
super.initState();
_resourceMonitor = ResourceMonitor();
// 监听CPU使用情况
_cpuSubscription = _resourceMonitor.cpuUsage.listen((CpuUsageData data) {
print('CPU Usage: ${data.userPercentage}% user, ${data.systemPercentage}% system');
});
// 监听内存使用情况
_memorySubscription = _resourceMonitor.memoryUsage.listen((MemoryUsageData data) {
print('Memory Usage: ${data.usedBytes} bytes used, ${data.totalBytes} bytes total');
});
// 监听电池状态
_batterySubscription = _resourceMonitor.batteryStatus.listen((BatteryStatusData data) {
print('Battery Status: ${data.level}% level, ${data.isCharging ? 'Charging' : 'Not Charging'}');
});
}
@override
void dispose() {
// 取消订阅
_cpuSubscription.cancel();
_memorySubscription.cancel();
_batterySubscription.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Resource Monitor Demo'),
),
body: Center(
child: Text('Check the console for resource monitor data.'),
),
),
);
}
}
在这个示例中,我们创建了一个Flutter应用,并在initState
方法中初始化了ResourceMonitor
实例,并订阅了CPU使用情况、内存使用情况和电池状态的流。每当数据发生变化时,相应的监听器会打印出最新的数据。
请注意,由于资源监控数据是实时变化的,因此在控制台中你会看到不断更新的数据输出。
此外,别忘了在dispose
方法中取消订阅,以避免内存泄漏。
这个示例展示了如何使用resource_monitor
插件来获取设备的资源使用情况。根据你的需求,你可以进一步处理这些数据,例如在UI中显示它们,或者根据资源使用情况触发某些操作。