Android 获取应用缓存大小与清除缓存的方法

如下所示：

package com.lucasey.littleant.frame;

 

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

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

 
public class FileCacheUtils { 
  
 public static void cleanInternalCache(Context context) { 
 deleteFilesByDirectory(context.getCacheDir()); 
 } 

  
 public static void cleanDatabases(Context context) { 
 deleteFilesByDirectory(new File("/data/data/" 
  + context.getPackageName() + "/databases")); 
 } 

  
 public static void cleanSharedPreference(Context context) { 
 deleteFilesByDirectory(new File("/data/data/" 
  + context.getPackageName() + "/shared_prefs")); 
 } 

  
 public static void cleanDatabaseByName(Context context, String dbName) { 
 context.deleteDatabase(dbName); 
 } 

  
 public static void cleanFiles(Context context) { 
 deleteFilesByDirectory(context.getFilesDir()); 
 } 

  
 public static void cleanExternalCache(Context context) { 
 if (Environment.getExternalStorageState().equals( 
  Environment.MEDIA_MOUNTED)) { 
  deleteFilesByDirectory(context.getExternalCacheDir()); 
 } 
 } 
  
 public static void cleanCustomCache(String filePath) { 
 deleteFilesByDirectory(new File(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); 
 } 
 } 

  
 private static void deleteFilesByDirectory(File directory) { 
 if (directory != null && directory.exists() && directory.isDirectory()) { 
  for (File item : directory.listFiles()) { 
  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 void deleteFolderFile(String filePath, boolean deleteThisPath) { 
 if (!TextUtils.isEmpty(filePath)) { 
  try { 
  File file = new File(filePath); 
  if (file.isDirectory()) {// 如果下面还有文件 
   File files[] = file.listFiles(); 
   for (int i = 0; i < files.length; i++) { 
   deleteFolderFile(files[i].getAbsolutePath(), true); 
   } 
  } 
  if (deleteThisPath) { 
   if (!file.isDirectory()) {// 如果是文件，删除 
   file.delete(); 
   } else {// 目录 
   if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除 
    file.delete(); 
   } 
   } 
  } 
  } catch (Exception e) { 
  // TODO Auto-generated catch block 
  e.printStackTrace(); 
  } 
 } 
 } 

  
 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)); 
 } 

} 

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