HarmonyOS 鸿蒙Next如何获取应用缓存并清理

查询缓存用storageStatistics.getCurrentBundleStats()接口， 清除文件缓存，需要调用context的cacheDir获取缓存，然后调用系统文件fs接口，判断是文件或者文件夹，再分别消除缓存。 详细用法见下面的链接： https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V2/js-apis-file-storage-statistics-0000001544584041-V2 https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/app-fs-space-statistics-V5 https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-file-fs-V5#fsrmdirsync

demo如下：

import { storageStatistics } from '@kit.CoreFileKit';
import fs from '@ohos.file.fs';
import { Context } from '@kit.AbilityKit';
import { BusinessError } from '@ohos.base';

//获取缓存
  getCacheSize() {
    storageStatistics.getCurrentBundleStats((error: BusinessError, bundleStats: storageStatistics.BundleStats) => {
      if (error) {
        console.error("getCurrentBundleStats failed with error:" + JSON.stringify(error));
      } else {
        let cacheSize = parseFloat((bundleStats.cacheSize / (1024*1024)).toFixed(1))
        console.info('cacheSize:' + cacheSize);
      }
    })
  }

//清理缓存
  clearCache() {
    const context: Context = getContext(this);
    let cacheDir = context.cacheDir
    fs.listFile(cacheDir).then((filenames) => {
      for (let i = 0;i < filenames.length; i++) {
        let dirPath = cacheDir+filenames[i]
        try {
          // 判断是否文件夹
          let isDirectory = fs.statSync(dirPath).isDirectory()
          if (isDirectory) {
            fs.rmdirSync(dirPath)
          } else {
            fs.unlink(dirPath).then(() => {
              console.info('remove file succeed');
            }).catch((err: BusinessError) => {
              console.info("remove file failed with error message: " + err.message + ", error code: " + err.code);
            });
          }
        }catch (e) {
          console.log(e)
        }
      }
    })
  }