package com.example.firstapp.utils
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import android.content.Context
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import android.os.Environment
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import java.io.File
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import java.math.BigDecimal
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@Suppress("DEPRECATION")
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class CacheUtils private constructor() {
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companion object {
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/**
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* 获取缓存大小
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*
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* @param context 上下文
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* @return 缓存大小
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*/
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fun getTotalCacheSize(context: Context): String {
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return try {
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var cacheSize = getFolderSize(context.cacheDir)
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if (Environment.getExternalStorageState() == Environment.MEDIA_MOUNTED) {
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cacheSize += getFolderSize(context.externalCacheDir)
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}
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getFormatSize(cacheSize.toDouble())
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} catch (e: Exception) {
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e.printStackTrace()
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Log.e("CacheUtils", "getTotalCacheSize: ${e.message}")
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"0KB"
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}
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}
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/***
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* 清理所有缓存
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* @param context 上下文
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*/
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fun clearAllCache(context: Context) {
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deleteDir(context.cacheDir)
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if (Environment.getExternalStorageState() == Environment.MEDIA_MOUNTED) {
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deleteDir(context.externalCacheDir)
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}
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}
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private fun deleteDir(dir: File?): Boolean {
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if (dir != null && dir.isDirectory) {
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val children = dir.list()!!
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for (child in children) {
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val success = deleteDir(File(dir, child))
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if (!success) {
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return false
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}
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}
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}
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assert(dir != null)
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return dir!!.delete()
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}
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// 获取文件
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//Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据
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//Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
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private fun getFolderSize(file: File?): Long {
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var size: Long = 0
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try {
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val fileList = file!!.listFiles()!!
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for (value in fileList) {
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// 如果下面还有文件
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size = if (value.isDirectory) {
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size + getFolderSize(value)
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} else {
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size + value.length()
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}
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}
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} catch (e: Exception) {
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e.printStackTrace()
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Log.e("CacheUtils", "getFolderSize: ${e.message}")
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}
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return size
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}
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/**
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* 格式化单位
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*
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* @param size 文件大小
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* @return 结果
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*/
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private fun getFormatSize(size: Double): String {
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val kiloByte = size / 1024
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if (kiloByte < 1) {
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return "0KB"
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}
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val megaByte = kiloByte / 1024
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if (megaByte < 1) {
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val result1 = BigDecimal(kiloByte.toString())
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return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB"
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}
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val gigaByte = megaByte / 1024
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if (gigaByte < 1) {
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val result2 = BigDecimal(megaByte.toString())
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return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB"
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}
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val teraBytes = gigaByte / 1024
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if (teraBytes < 1) {
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val result3 = BigDecimal(gigaByte.toString())
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return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB"
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}
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val result4 = BigDecimal(teraBytes)
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return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB"
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}
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}
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}
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