Flutter日志处理插件flutter_native_log_handler的使用

Flutter日志处理插件flutter_native_log_handler的使用

flutter_native_log_handler

• 功能：监听Android和iOS的日志。
• 动机：在开发过程中，我们可能需要将所有应用的日志发送到一个日志后端。Dart的zones特性可以轻松捕获Flutter的日志。但是，对于Android原生插件和Android本身以及iOS原生的日志呢？这个包提供了监听这些日志消息并按需处理它们的能力（我不会打印它们，因为无限循环通常不是一个好事情😉）。

安装

• 通过命令行安装：

  dart pub add flutter_native_log_handler
  

• 或者手动添加到pubspec.yaml文件中：

  dependencies:
    flutter_native_log_handler: ^1ersion
  

使用示例

import 'package:flutter/material.dart';
import 'package:flutter/native_logs/flutter_native_logs.dart';

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

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

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _flutterNativeLogsPlugin = FlutterNativeLogs();
  StreamSubscription<NativeLogMessage>? _logStreamSubscription;
  String _logs = '';

  [@override](/user/override)
  void initState() {
    super.initState();
    initPlatformState();
    _periodicPrint();
  }

  Future<void> _periodicPrint() async {
    while (true) {
      // ignore: avoid_print
      print('Test periodic print');
      await Future.delayed(Duration(seconds: 3));
    }
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      platformVersion = await _flutterNativeLogsPlugin.getPlatformVersion() ?? 'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  [@override](/user/override)
  void dispose() {
    super.dispose();
    _logStreamSubscription?.cancel();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Column(
          children: [
            Text('Running on: $_platformVersion\n'),
            ElevatedButton(
              onPressed: () {
                setState(() {
                  if (_logStreamSubscription == null) {
                    _logStreamSubscription =
                        _flutterNativeLogsPlugin.logStream.listen(
                          (NativeLogMessage message) {
                            _doSomethingWithLogMessage(message: message.message);
                          },
                        );
                  } else {
                    _logStreamSubscription?.cancel();
                    _logStreamSubscription = null;
                  }
                });
              },
              child: Text(_logStreamSubscription != null ? 'Stop' : 'Start'),
            ),
            Flexible(
              child: SingleChildScrollView(
                reverse: true,
                child: Text(_logs),
              ),
            )
          ],
        ),
      ),
    );
  }

  void _doSomethingWithLogMessage({required String message}) {
    setState(() {
      _logs = '$_logs\n$message';
    });
  }
}