Flutter系统文件夹访问插件open_system_folder_platform_interface的使用

open_system_folder_platform_interface 是一个用于 open_system_folder 插件的通用平台接口。

该接口允许特定平台实现 open_system_folder 插件，并确保它们支持相同的接口。

使用

要为 open_system_folder 实现一个新的平台特定实现，可以扩展 OpenSystemFolderPlatform 类，并添加执行平台特定行为的实现。

示例代码

以下是一个简单的示例，展示了如何在 Flutter 中使用 open_system_folder 插件来打开系统文件夹。

步骤 1: 添加依赖

在 pubspec.yaml 文件中添加 open_system_folder 依赖：

dependencies:
  flutter:
    sdk: flutter
  open_system_folder: ^1.0.0 # 请根据实际版本号进行修改

步骤 2: 创建平台特定实现

创建一个新的类，继承自 OpenSystemFolderPlatform 并实现所需的方法。例如，在 Android 平台上：

// lib/src/android_open_system_folder.dart
import 'package:open_system_folder_platform_interface/open_system_folder_platform_interface.dart';
import 'package:flutter/services.dart';

class AndroidOpenSystemFolder extends OpenSystemFolderPlatform {
  static const MethodChannel _channel = MethodChannel('open_system_folder');

  @override
  Future<void> openSystemFolder(String folderPath) async {
    await _channel.invokeMethod('openSystemFolder', {'folderPath': folderPath});
  }
}

在 iOS 平台上：

// lib/src/ios_open_system_folder.dart
import 'package:open_system_folder_platform_interface/open_system_folder_platform_interface.dart';
import 'package:flutter/services.dart';

class IosOpenSystemFolder extends OpenSystemFolderPlatform {
  static const MethodChannel _channel = MethodChannel('open_system_folder');

  @override
  Future<void> openSystemFolder(String folderPath) async {
    await _channel.invokeMethod('openSystemFolder', {'folderPath': folderPath});
  }
}

步骤 3: 配置平台特定实现

在 MainActivity.kt (Android) 和 AppDelegate.swift (iOS) 中配置平台特定实现。

Android:

// android/app/src/main/kotlin/com/example/yourapp/MainActivity.kt
import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.plugin.common.MethodChannel
import android.content.Intent
import android.os.Bundle

class MainActivity: FlutterActivity() {
  private val CHANNEL = "open_system_folder"

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    MethodChannel(flutterEngine?.dartExecutor?.binaryMessenger, CHANNEL).setMethodCallHandler { call, result ->
      if (call.method == "openSystemFolder") {
        val folderPath = call.argument<String>("folderPath")
        openFolder(folderPath)
        result.success(null)
      } else {
        result.notImplemented()
      }
    }
  }

  private fun openFolder(path: String?) {
    val intent = Intent(Intent.ACTION_VIEW)
    intent.setDataAndType(android.net.Uri.parse("file://" + path), "*/*")
    startActivity(intent)
  }
}

iOS:

// ios/Runner/AppDelegate.swift
import UIKit
import Flutter
import open_system_folder

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    let channel = FlutterMethodChannel(name: "open_system_folder", binaryMessenger: controller.binaryMessenger)

    channel.setMethodCallHandler({
      (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
      if call.method == "openSystemFolder" {
        let folderPath = call.arguments as? String
        self.openFolder(folderPath: folderPath)
        result(nil)
      } else {
        result(FlutterMethodNotImplemented)
      }
    })

    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  private func openFolder(folderPath: String?) {
    guard let folderPath = folderPath else { return }
    let url = URL(fileURLWithPath: folderPath)
    NSWorkspace.shared.open(url)
  }
}

步骤 4: 在 Flutter 项目中调用插件

在 Flutter 项目的 Dart 代码中调用插件方法：

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();
    // 初始化插件
    OpenSystemFolderPlatform.instance.openSystemFolder('/path/to/folder');
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('open_system_folder Example'),
        ),
        body: Center(
          child: Text('尝试打开文件夹'),
        ),
      ),
    );
  }
}

以上代码展示了如何在 Flutter 项目中使用 open_system_folder 插件来打开系统文件夹。