具体内容如下

import android.content.Context;import android.os.Environment;import java.io.File;import java.math.BigDecimal;/** * 获取缓存大小并清理缓存 */public class DataCleanManagerUtils { /**  * 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  */ /**  * 获取缓存值  */ public static String getTotalCacheSize(Context context) {  long cacheSize = getFolderSize(context.getCacheDir());  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {   cacheSize += getFolderSize(context.getExternalCacheDir());  }  return getFormatSize(cacheSize); } /**  * 清除所有缓存  */ public static void clearAllCache(Context context) {  deleteDir(context.getCacheDir());  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {   deleteDir(context.getExternalCacheDir());   //TODO 有网页清理时注意排错，是否存在/data/data/应用package目录下找不到database文件夹的问题   context.deleteDatabase("webview.db");   context.deleteDatabase("webviewCache.db");  } } /**  * 删除某个文件  */ 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();  }  if (dir != null) {   return dir.delete();  } else {   return false;  } } /**  * 获取文件  */ public static long getFolderSize(File file) {  long size = 0;  if (file != null) {   File[] fileList = file.listFiles();   if (fileList != null && fileList.length > 0) {    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();     }    }   }  }  return size; } /**  * 格式化单位  */ public static String getFormatSize(double size) {  double kiloByte = size / 1024;  double megaByte = kiloByte / 1024;  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 = BigDecimal.valueOf(teraBytes);  return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()   + "TB"; }}