Android 如何获取设备唯一标识

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<application
  ...
  android:requestLegacyExternalStorage="true">

import 'dart:io';
import 'package:uuid/uuid.dart';

// 本地持久化存储uuid代码实践
class Storage {
 static File file;

 // 入口
 static Future<String> init() async {
  bool boolCreateFile = await createFile();
  if (boolCreateFile) {
   String uuid = await readData();
   return uuid;
  } else {
   await writeData();
   String uuid = await readData();
   return uuid;
  }
 }

 // 创建文件
 static Future<bool> createFile() async {
  file = File('/storage/emulated/0/uuid.ini'); // 指向根目录下的文件uuid
  bool exists = await file.exists();
  return exists;
 }

 // 写入数据
 static writeData() async {
  // 如果文件存在，会将原来的内容覆盖, 如果不存在，则创建文件
  String uuid = await getUuid();
  file.writeAsString('$uuid');
 }

 // 读取文件
 static Future<String> readData() async {
  try {
   String uuid = await file.readAsString();
   return uuid;
  } catch (e) {
   return null;
  }
 }

 // 获取uuid，采用的插件:uuid
 static Future<String> getUuid() async {
  Uuid uuidObj = Uuid();
  String uuid = uuidObj.v1();
  return uuid;
 }
}