HarmonyOS开发中怎么清除当前应用的缓存？

Question

HarmonyOS开发中怎么清除当前应用的缓存？获取了当前应用的缓存大小，请问怎么清除？使用的StorageStatistics.getCurrentBundleStats()方法获取的cacheSize。

Answer 1

先查询缓存用storageStatistics.getCurrentBundleStats()接口，再清除文件缓存，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。
参考 https://developer.huawei.com/consumer/cn/doc/harmonyos-refere...，关于清理的demo：

import fs from ‘@ohos.file.fs’; 
let cacheDir = context.cacheDir; 
@Entry 
@Component 
struct Clear_cache { 
  clearCache() { 
    // let cacheDir = getContext(this).cacheDir 
    // fs.rmdirSync(cacheDir) 
    // console.log(“delete !!!”) 
 
    fs.listFile(cacheDir).then((filenames) => { 
      for (let i = 0;i < filenames.length; i++) { 
        // let dirPath = cacheDir+filenames[i] 
        let dirPath = ${cacheDir}/${filenames[i]} 
        // 判断是否文件夹 
        let isDirectory 
        try { 
          isDirectory = fs.statSync(dirPath).isDirectory() 
        } 
        catch (e) { 
          console.log(e) 
        } 
 
        if (isDirectory) { 
          fs.rmdirSync(dirPath) 
        } else { 
          fs.unlink(dirPath).then(() => { 
            console.info(“remove file succeed”); 
          }).catch((err) => { 
            console.info("remove file failed with error message: " + err.message + ", error code: " + err.code); 
          }); 
        } 
      } 
 
    }) 
  } 
}