demo/xinhuaribao/lib/util/cache_util.dart

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

class CacheUtil {
  // 获取缓存大小
  static Future<int> getCacheSize() async {
    Directory tempDir = await getTemporaryDirectory();
    if (!await tempDir.exists()) return 0;
    return await _calculateSize(tempDir);
  }

  // 递归计算目录大小
  static Future<int> _calculateSize(FileSystemEntity file) async {
    if (file is File) return await file.length();
    if (file is Directory) {
      int total = 0;
      final children = file.listSync();
      for (final child in children) {
        total += await _calculateSize(child);
      }
      return total;
    }
    return 0;
  }

  // 清理缓存
  static Future<void> clearCache() async {
    Directory tempDir = await getTemporaryDirectory();
    if (await tempDir.exists()) {
      await _deleteDirectory(tempDir);
    }
  }

  // 递归删除目录
  static Future<void> _deleteDirectory(FileSystemEntity file) async {
    if (file is Directory) {
      final children = file.listSync();
      for (final child in children) {
        await _deleteDirectory(child);
      }
      await file.delete();
    } else if (file is File) {
      await file.delete();
    }
  }
}