【MVP】CacheUtil缓存工具类，获得缓存大小和清除缓存

package com.example.chen.lolhelper.util;

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

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

/**
* Created by chen on 2017/8/24.
*
* 缓存类
*/

public class CacheUtil {

/**
* * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * *
*
* @param context
*/
public static void cleanInternalCache(Context context) {
deleteFilesByDirectory(context.getCacheDir());
}

/**
* 清除本应用所有数据库(/data/data/com.xxx.xxx/databases)
* @param context
*/
public static void cleanDatabases(Context context){
deleteFilesByDirectory(new File("/data/data/"
+context.getPackageName()+"/databases"));
}

/**
* * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) *
*
* @param context
*/
public static void cleanSharedPreference(Context context){
deleteFilesByDirectory(new File("/data/data/"
+context.getPackageName()+"/shared_prefs"));
}

/**
* * 按名字清除本应用数据库 * *
*
* @param context
* @param dbname
*/
public static void cleanDatabaseByName(Context context,String dbname){
context.deleteDatabase(dbname);
}

/**
* * 清除/data/data/com.xxx.xxx/files下的内容 * *
*
* @param context
*/
public static void cleanFiles(Context context) {
deleteFilesByDirectory(context.getFilesDir());
}

/**
* * 清除外部cache下的内容(/mnt/sdcard/android/data/com.xxx.xxx/cache)
*
* @param context
*/
public static void cleanExternalCache(Context context){
if (Environment.getExternalStorageState()
.equals(Environment.MEDIA_MOUNTED)){
deleteFilesByDirectory(context.getExternalCacheDir());
}
}

/**
* * 清除自定义路径下的文件，使用需小心，请不要误删。而且只支持目录下的文件删除 * *
*
* @param filePath
*/
public static void cleanCustomCache(String filePath){
deleteFilesByDirectory(new File(filePath));
}

/**
* * 清除本应用所有的数据 * *
*
* @param context
* @param filepath
*/
public static void cleanApplicationData(Context context, String... filepath) {
cleanInternalCache(context);
cleanExternalCache(context);
cleanDatabases(context);
cleanSharedPreference(context);
cleanFiles(context);
if (filepath == null) {
return;
}
for (String filePath : filepath) {
cleanCustomCache(filePath);
}
}

/**
* * 删除方法 这里只会删除某个文件夹下的文件，如果传入的directory是个文件，将不做处理 * *
*
* @param directory
*/
public static void deleteFilesByDirectory(File directory){
if(directory != null && directory.exists() && directory.isDirectory()){
for (File item:directory.listFiles()){
if (item.isFile()){
item.delete();
}else if (item.isDirectory()){
deleteFilesByDirectory(item);
}
}
}
}

/**
*
* 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
*
* 计算文件夹的大小
* @param file
* @return
* @throws Exception
*/
public static long getFolderSize(File file)throws Exception{
long szie = 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()){
szie = szie + getFolderSize(fileList[i]);
}else {
szie = szie + fileList[i].length();
}
}
}catch (Exception e){
e.printStackTrace();
}
return szie;
}

public static String getFormatSize(double size){
double kiloByte = size/1024;
if (kiloByte < 1){
return size+"Byte";
}
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";
}
public static String  getCacheSize(File file)throws Exception{
return getFormatSize(getFolderSize(file));
}
}