本次主要實(shí)現(xiàn)文件/文件夾的創(chuàng)建拦耐、刪除空民、寫入狡耻、讀取具體代碼如下：

1.在pubsec.ymal引入"path_provider: ^2.0.7"

path_provider: ^2.0.7

2.廢話不多說淮悼，直接上代碼（注意同步異步問題即可）

import 'package:flutter/cupertino.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:io';

class Fileutil {
  static Fileutil shared = Fileutil._instance();
  Fileutil._instance();
   ///getExternalStorageDirectory()：獲取存儲卡目錄陪踩，僅支持Android杖们；
  /// 找到正確的本地路徑
  /// getApplicationDocumentsDirectory 類似iOS的NSDocumentDirectory和Android上的AppData目錄
  get localDocPath async {
    final directory = await getApplicationDocumentsDirectory();
    return directory.path;
  }

  /// getTemporaryDirectory 類似iOS的NSTemporaryDirectory和Android的getCacheDir
  get localTempPath async {
    final directory = await getTemporaryDirectory();
    return directory.path;
  }

  ///創(chuàng)建文件夾
 setFileFolder(String path) async{
    Directory directory = new Directory('$path');
    if (!directory.existsSync()) {
      directory.createSync();
      debugPrint('文件夾初始化成功悉抵，文件保存路徑為 ${directory.path}');
    } else {
      debugPrint('文件夾已存在');
    }
    return directory.path;
  }

  ///創(chuàng)建文件
  setFile(String path) {
    File file = new File('$path');
    if (!file.existsSync()) {
      file.createSync();
      debugPrint('創(chuàng)建成功');
    } else {
      debugPrint('文件已存在');
    }
    return file;
  }

  /// 將數(shù)據(jù)寫入文件
  void writeCounter(String path, String content) async{
    // Write the file
    File file = await setFile(path);
    try {
      file.writeAsStringSync('$content');
      debugPrint('文件寫入成功');
    } catch (e) {
      debugPrint('文件寫入失敗');
    }
  }

  /// 從文件中讀取數(shù)據(jù)
  readCounter(String path) async {
    File file = await setFile(path);
    try {
      // Read the file
      String contents = file.readAsStringSync();
      debugPrint('文件讀取成功:$contents');
      return contents;
    } catch (e) {
      debugPrint('文件讀取失敗');
      return '';
    }
  }

  ///文件/文件夾刪除
  deleteFilefloder(String path) {
    Directory directory = new Directory(path);
    if (directory.existsSync()) {
      List<FileSystemEntity> files = directory.listSync();
      if (files.length > 0) {
        files.forEach((file) {
        file.deleteSync();
        });
      }
      directory.deleteSync();
      debugPrint('文件夾刪除成功');
    }
  }

  ///刪除文件
  deleteFile(String path) {
    File file = new File('$path');
    if (file.existsSync()) {
      try {
        file.deleteSync();
        debugPrint('文件刪除成功');
      } catch (e){
        debugPrint('文件刪除失敗');
      }
    }
  }

  ///遍歷所有文件
  getAllSubFile(String path) async{
    Directory directory = new Directory(path);
    if (directory.existsSync()) {
      return directory.listSync();
    }
    return [];
  }
}