content: /**
   * Copyright 2014 Zhenguo Jin
   * <p/>
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.rsen.github.androidutils;
  
  import android.content.Context;
  import android.os.Environment;
  
  import java.io.File;
  import java.math.BigDecimal;
  
  /**
   * 本应用数据清除管理器
   * 主要功能有清除内/外缓存，清除数据库，清除sharedPreference，清除files和清除自定义目录
   *
   * @author jingle1267@163.com
   */
  public class DataCleanManager {
  
      /**
       * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache)
       *
       * @param context 上下文
       */
      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 上下文
       */
      public static void cleanDatabases(Context context) {
          deleteFilesByDirectory(new File(context.getFilesDir().getPath()
                  + context.getPackageName() + "/databases"));
      }
  
      /**
       * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs)
       *
       * @param context 上下文
       */
      public static void cleanSharedPreference(Context context) {
          deleteFilesByDirectory(new File(context.getFilesDir().getPath()
                  + context.getPackageName() + "/shared_prefs"));
      }
  
      /**
       * 按名字清除本应用数据库
       *
       * @param context 上下文
       * @param dbName 数据库名称
       */
      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 上下文
       */
      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 上下文
       */
      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 文件路径
       */
      public static void cleanCustomCache(String filePath) {
          deleteFilesByDirectory(new File(filePath));
      }
  
      /**
       * 清除本应用所有的数据
       *
       * @param context 上下文
       * @param filePath 文件路径
       */
      public static void cleanApplicationData(Context context, String... filePath) {
          cleanInternalCache(context);
          cleanExternalCache(context);
          cleanDatabases(context);
          cleanSharedPreference(context);
          cleanFiles(context);
          for (String fp : filePath) {
              cleanCustomCache(fp);
          }
      }
  
      /**
       * 删除方法 这里只会删除某个文件夹下的文件。 此操作较危险，请慎用；
       *
       *
       * @param directory 文件夹File对象
       */
      private static void deleteFilesByDirectory(File directory) {
          if (directory != null && directory.exists() && directory.isDirectory()) {
              for (File item : directory.listFiles()) {
                  // delete file and folder. It's dangerous!
                  if (item.isDirectory()) {
                      deleteFilesByDirectory(item);
                  } else {
                      item.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;
      }
  
      public static String getCacheSize(File file) throws Exception {
          return getFormatSize(getFolderSize(file));
      }
  
      /**
       * 格式化单位
       *
       * @param size
       * @return
       */
      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";
      }
  
  }