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   开发中，系统空间不足、缓存目录配额限制等问题可能导致应用崩溃或功能异常。所以如何获取和监控文件系统空间及应用自身存储使用情况，可以帮助构建更健壮的应用。

二、核心 API 模块

2.1 两大核心模块

三、API 说明

3.1 文件系统空间统计接口

3.2 应用空间统计接口

四、BundleStats 属性

4.1 属性说明

4.2 沙箱目录

进入应用沙箱命令：

# 1. 连接设备
hdc shell

# 2. 进入指定进程的沙箱空间
nsenter -t {pid} -m sh

# 示例：进入进程ID为1234的应用沙箱
nsenter -t 1234 -m sh

EL级别说明：

• el1-el5 表示不同安全等级的沙箱目录

• 不同EL级别对应不同的数据隔离级别

五、代码示例

5.1 获取文件系统剩余空间

import { statfs } from '@kit.CoreFileKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';

// 获取应用上下文
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let path = context.filesDir;

// 获取文件系统剩余空间
statfs.getFreeSize(path, (err: BusinessError, number: number) => {
  if (err) {
    console.error(`Invoke getFreeSize failed, code is ${err.code}, message is ${err.message}`);
  } else {
    console.info(`Invoke getFreeSize succeeded, size is ${number}`);
  }
});

5.2 获取当前应用存储空间

import { storageStatistics } from '@kit.CoreFileKit';
import { BusinessError } from '@kit.BasicServicesKit';

// 获取当前应用存储统计
storageStatistics.getCurrentBundleStats((err: BusinessError, bundleStats: storageStatistics.BundleStats) => {
  if (err) {
    console.error(`Invoke getCurrentBundleStats failed, code is ${err.code}, message is ${err.message}`);
  } else {
    console.info(`Invoke getCurrentBundleStats succeeded, appsize is ${bundleStats.appSize}`);
    console.info(`Cache size: ${bundleStats.cacheSize}`);
    console.info(`Data size: ${bundleStats.dataSize}`);
  }
});

5.3 异步获取内置存储空间

import { storageStatistics } from '@kit.CoreFileKit';
import { BusinessError } from '@kit.BasicServicesKit';

// 异步获取总空间
storageStatistics.getTotalSize().then((number: number) => {
  console.info(`getTotalSize successfully, number is ${number}`);
}).catch((err: BusinessError) => {
  console.error(`getTotalSize failed with error, code is ${err.code}, message is ${err.message}`);
});

// 异步获取可用空间
storageStatistics.getFreeSize().then((number: number) => {
  console.info(`getFreeSize successfully, number is ${number}`);
}).catch((err: BusinessError) => {
  console.error(`getFreeSize failed with error, code is ${err.code}, message is ${err.message}`);
});

5.4 同步获取内置存储空间

import { storageStatistics } from '@kit.CoreFileKit';
import { BusinessError } from '@kit.BasicServicesKit';

// 同步获取总空间
try {
  let number = storageStatistics.getTotalSizeSync();
  console.info(`getTotalSizeSync successfully, number is ${number}`);
} catch (err) {
  let error: BusinessError = err as BusinessError;
  console.error(`getTotalSizeSync failed with error, code is ${error.code}, message is ${error.message}`);
}

// 同步获取可用空间
try {
  let number = storageStatistics.getFreeSizeSync();
  console.info(`getFreeSizeSync successfully, number is ${number}`);
} catch (err) {
  let error: BusinessError = err as BusinessError;
  console.error(`getFreeSizeSync failed with error, code is ${error.code}, message is ${error.message}`);
}