清除缓存工具类

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package com.bwie.topnewsnormal.utils;

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

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

/**
* Created by Shadow on 2017/8/22.
*/

public class DataCleanManager {

//获得getCacheDir文件夹的大小public static String getTotalCacheSize(Context context) throws Exception {    long cacheSize = getFolderSize(context.getCacheDir());    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {        cacheSize += getFolderSize(context.getExternalCacheDir());    }    //格式化大小    return getFormatSize(cacheSize);}//删除所有缓存public static void clearAllCache(Context context) {    deleteDir(context.getCacheDir());    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {        deleteDir(context.getExternalCacheDir());    }}//删除一个文件夹下的所有文件private static boolean deleteDir(File dir) {    if (dir != null && dir.isDirectory()) {        String[] children = dir.list();        for (int i = 0; i < children.length; i++) {            boolean success = deleteDir(new 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public static long getFolderSize(File file) throws Exception {    long size = 0;    try {        File[] fileList = file.listFiles();        for (int i = 0; i < fileList.length; i++) {            // 如果下面还有文件            if (fileList[i].isDirectory()) {                size = size + getFolderSize(fileList[i]);            } else {                size = size + fileList[i].length();            }        }    } catch (Exception e) {        e.printStackTrace();    }    return size;}/** * 格式化单位 * * @param size * @return */public static String getFormatSize(double size) {    double kiloByte = size / 1024;    if (kiloByte < 1) {

// return size + “Byte”;
return “0K”;
}

    double megaByte = kiloByte / 1024;    if (megaByte < 1) {        BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));        return result1.setScale(2, BigDecimal.ROUND_HALF_UP)                .toPlainString() + "KB";    }    double gigaByte = megaByte / 1024;    if (gigaByte < 1) {        BigDecimal result2 = new BigDecimal(Double.toString(megaByte));        return result2.setScale(2, BigDecimal.ROUND_HALF_UP)                .toPlainString() + "MB";    }    double teraBytes = gigaByte / 1024;    if (teraBytes < 1) {        BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));        return result3.setScale(2, BigDecimal.ROUND_HALF_UP)                .toPlainString() + "GB";    }    BigDecimal result4 = new BigDecimal(teraBytes);    return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()            + "TB";}

}

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