Android 获得本应用的缓存和清除缓存的代码实例

android 获得本应用的缓存和清除缓存的代码实例

package com.luoy.blocklover.common.untils;

import android.content.context;
import android.os.environment;

import java.io.file;
import java.math.bigdecimal;

/**
 * created by luoy on 2018/7/24 0024.
 */

public class datacleanmanager {/**
 * 获取缓存大小
 * @param context
 * @return
 * @throws exception
 */
public static string gettotalcachesize(context context) throws exception {
 long cachesize = getfoldersize(context.getcachedir());
 if (environment.getexternalstoragestate().equals(environment.media_mounted)) {
  cachesize += getfoldersize(context.getexternalcachedir());
 }
 return getformatsize(cachesize);
}

 /**
  * 清除缓存
  * @param context
  */
 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 (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
 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() + "k";
  }

  double gigabyte = megabyte / 1024;
  if (gigabyte < 1) {
bigdecimal result2 = new bigdecimal(double.tostring(megabyte));
return result2.setscale(2, bigdecimal.round_half_up)
  .toplainstring() + "m";
  }

  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";
 }
}