计算缓存大小并且清空缓存

来源：互联网发布：淘宝客服售前做什么编辑：程序博客网时间：2024/04/30 11:18

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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publicclass DataCleanManager {
     
     publicstatic String getTotalCacheSize(Context context) throwsException {
            longcacheSize = getFolderSize(context.getCacheDir());
            if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
                cacheSize += getFolderSize(context.getExternalCacheDir());
            } 
            returngetFormatSize(cacheSize);
        }
   
   
    publicstatic void clearAllCache(Context context) {
        deleteDir(context.getCacheDir());
        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
            deleteDir(context.getExternalCacheDir());
        } 
    }
   
    privatestatic boolean deleteDir(File dir) {
        if(dir != null&& dir.isDirectory()) {
            String[] children = dir.list();
            for(inti = 0; i < children.length; i++) {
                booleansuccess = deleteDir(newFile(dir, children[i]));
                if(!success) {
                    returnfalse;
                }
            }
        }
        returndir.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  
    publicstatic long getFolderSize(File file) throwsException {  
        longsize = 0; 
        try{  
            File[] fileList = file.listFiles();  
            for(inti = 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(); 
        } 
        returnsize;  
    } 
       
    /**
     * 格式化单位 
     * 
     * @param size 
     * @return 
     */ 
    publicstatic String getFormatSize(doublesize) {  
        doublekiloByte = size / 1024; 
        if(kiloByte < 1) {  
//            return size + "Byte";  
            return"0K";
        } 
   
        doublemegaByte = kiloByte / 1024; 
        if(megaByte < 1) {  
            BigDecimal result1 = newBigDecimal(Double.toString(kiloByte));  
            returnresult1.setScale(2, BigDecimal.ROUND_HALF_UP)  
                    .toPlainString() + "KB"; 
        } 
   
        doublegigaByte = megaByte / 1024; 
        if(gigaByte < 1) {  
            BigDecimal result2 = newBigDecimal(Double.toString(megaByte));  
            returnresult2.setScale(2, BigDecimal.ROUND_HALF_UP)  
                    .toPlainString() + "MB"; 
        } 
   
        doubleteraBytes = gigaByte / 1024; 
        if(teraBytes < 1) {  
            BigDecimal result3 = newBigDecimal(Double.toString(gigaByte));  
            returnresult3.setScale(2, BigDecimal.ROUND_HALF_UP)  
                    .toPlainString() + "GB"; 
        } 
        BigDecimal result4 = newBigDecimal(teraBytes);  
        returnresult4.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

之前在网上查了很多别人写的方法，查询可以用，当清空往往是无效的，这个无效的方法如下：

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privatestatic void deleteFilesByDirectory(File directory) {  
        if(directory != null&& directory.exists() && directory.isDirectory()) {  
            for(File item : directory.listFiles()) {  
                item.delete(); 
            } 
        } 
    }

应该是directory的问题，相关的链接在此

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