Android开发:计算缓存大小并且清空缓存

项目中碰到了计算缓存大小和清空缓存的功能,这个很常见的功能,几乎每个APP都有,以为实现很简单,网上搜了一大堆,发现都不是符合我需要的,而且经常删除的没有效果,于是又另外找了一些资料,折腾了蛮久,终于完成了

以下的这个类的功能很简单,计算你的缓存总大小,不管内部缓存还是外部缓存,和清空缓存,包括内部和外部的缓存一起清空,请本人亲测,效果杠杠的。

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public class DataCleanManager {
     
      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);
         }
   
   
     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 
     //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() + "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"
    
       
       
    
}
当你在项目中需要查下缓存大小,就使用getTotalCacheSize(Context)方法,清空缓存,就使用clearAllCache(Context)方法

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转载自blog.csdn.net/TTHHVV/article/details/78772707