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Android开发获取缓存，删除缓存

app设置中往往有清理缓存的功能。会显示当前缓存时多少，然后可以点击清理缓存

直接上代码：

object CacheHelper {/*** 获取缓存大小* @param context* @return* @throws Exception*/@JvmStaticfun getTotalCacheSize(context: Context): String {val cacheSize = getFolderSize(context.cacheDir)if (Environment.getExternalStorageState() == Environment.MEDIA_MOUNTED) {// cacheSize += getFolderSize(context.getExternalCacheDir());}return getFormatSize(cacheSize.toDouble())}/*** 清除缓存* @param context*/fun clearAllCache(context: Context) {deleteDir(context.cacheDir)if (Environment.getExternalStorageState() == Environment.MEDIA_MOUNTED) {deleteDir(context.externalCacheDir)}}private fun deleteDir(dir: File?): Boolean {if (dir != null && dir.isDirectory) {if (dir.list() == null) {return false}val children = dir.list() ?: return falsefor (i in children.indices) {val success = deleteDir(File(dir, children[i]))if (!success) {return false}}}return dir?.delete() ?: false}// 获取文件大小//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//Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据@Throws(Exception::class)fun getFolderSize(file: File): Long {var size: Long = 0try {val fileList = file.listFiles()for (i in fileList.indices) {// 如果下面还有文件size += if (fileList[i].isDirectory) {getFolderSize(fileList[i])} else {fileList[i].length()}}} catch (e: Exception) {e.printStackTrace()}return size}/*** 格式化单位* @param size* @return*/private fun getFormatSize(size: Double): String {val kiloByte = size / 1024if (kiloByte < 1) {// return size + "Byte";return "0K"}val megaByte = kiloByte / 1024if (megaByte < 1) {val result1 = BigDecimal(java.lang.Double.toString(kiloByte))return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "K"}val gigaByte = megaByte / 1024if (gigaByte < 1) {val result2 = BigDecimal(java.lang.Double.toString(megaByte))return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "M"}val teraBytes = gigaByte / 1024if (teraBytes < 1) {val result3 = BigDecimal(java.lang.Double.toString(gigaByte))return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB"}val result4 = BigDecimal(teraBytes)return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB"}
}

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