DataCleanManager.java

package com.pandaq.pandaeye.utils;

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

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

/**
 * Created by PandaQ on 2017/3/24.
 * 应用数据清除管理器
 */


public class DataCleanManager {

    public static String getTotalCacheSize(Context context) {
        long cacheSize = 0;
        try {
            cacheSize = getFolderSize(context.getCacheDir());
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                cacheSize += getFolderSize(context.getExternalCacheDir());
            }
        } catch (Exception e) {
            Toast.makeText(context, "Get Cache Size Fail", Toast.LENGTH_LONG).show();
            e.printStackTrace();
        }
        return getFormatSize(cacheSize);
    }


    public static void clearAllCache(Context context) {
        deleteDir(context.getCacheDir());
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            deleteDir(context.getExternalCacheDir());
        }
    }

    private static boolean deleteDir(File dir) {
        if (dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for (String aChildren : children) {
                boolean success = deleteDir(new File(dir, aChildren));
                if (!success) {
                    return false;
                }
            }
        }
        return dir != null && 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 (File aFileList : fileList) {
                // 如果下面还有文件
                if (aFileList.isDirectory()) {
                    size = size + getFolderSize(aFileList);
                } else {
                    size = size + aFileList.length();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return size;
    }

    /**
     * 格式化单位
     *
     * @param size 传入的 byte大小
     * @return 常规 kb mb gb tb 单位的大小
     */
    public static String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            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";
    }
}