Android开发清理缓存工具类_美一点工具类-优快云博客

本文链接：https://blog.youkuaiyun.com/hhoo3344521/article/details/90374967

本文介绍了如何在Android开发中创建并使用一个实用的缓存清理工具类，包括调用方法获取缓存大小以及执行清理操作，帮助优化应用程序性能。

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package chengying.com.core.util

import android.content.Context
import android.os.Environment

import java.io.File
import java.math.BigDecimal

/**
 * Created by yangfan
 * nrainyseason@163.com
 * 清理缓存
 */
object DataCleanManager {
    /**
     * 获取当前缓存
     *
     * @param context
     * @return
     * @throws Exception
     */
    @Throws(Exception::class)
    fun getTotalCacheSize(context: Context): String {
        var cacheSize = getFolderSize(context.cacheDir)
        if (Environment.getExternalStorageState() == Environment.MEDIA_MOUNTED) {
            cacheSize += getFolderSize(context.externalCacheDir)
        }
        return getFormatSize(cacheSize.toDouble())
    }

    /**
     * 清空缓存
     *
     * @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) {
            val children = dir.list()
            for (i in children.indices) {
                val success = deleteDir(File(dir, children[i]))
                if (!success) {
                    return false
                }
            }
        }
        return dir!!.delete()
    }

    // 获取文件
    //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 = 0
        try {
            val fileList = file!!.listFiles()
            for (i in fileList.indices) {
                // 如果下面还有文件
                if (fileList[i].isDirectory) {
                    size = size + getFolderSize(fileList[i])
                } else {
                    size = size + fileList[i].length()
                }
            }
        } catch (e: Exception) {
            e.printStackTrace()
        }

        return size
    }

    /**
     * 格式化单位
     *
     * @param size
     * @return
     */
    fun getFormatSize(size: Double): String {
        val kiloByte = size / 1024
        if (kiloByte < 1) {
            return "0.00M"
        }

        val megaByte = kiloByte / 1024
        if (megaByte < 1) {
            val result1 = BigDecimal(java.lang.Double.toString(kiloByte))
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "K"
        }

        val gigaByte = megaByte / 1024
        if (gigaByte < 1) {
            val result2 = BigDecimal(java.lang.Double.toString(megaByte))
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "M"
        }

        val teraBytes = gigaByte / 1024
        if (teraBytes < 1) {
            val result3 = BigDecimal(java.lang.Double.toString(gigaByte))
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "G"
        }
        val result4 = BigDecimal(teraBytes)
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB"
    }
}

调用获取缓存大小

DataCleanManager.getTotalCacheSize(ctx)

调用清理缓存

DataCleanManager.clearAllCache(this@SettingActivity)