Android开发：计算缓存大小并且清空缓存

来源：互联网发布：心理学与生活知乎编辑：程序博客网时间：2024/05/17 09:09

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 {
     
     publicstatic String getTotalCacheSize(Context context)throws Exception {
            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 booleandeleteDir(File dir) {
        if(dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for(int i = 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) throws Exception {  
        longsize = 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(); 
        } 
        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 =new BigDecimal(Double.toString(kiloByte)); 
            returnresult1.setScale(2, BigDecimal.ROUND_HALF_UP) 
                    .toPlainString() +"KB";  
        } 
   
        doublegigaByte = megaByte / 1024; 
        if(gigaByte < 1) { 
            BigDecimal result2 =new BigDecimal(Double.toString(megaByte)); 
            returnresult2.setScale(2, BigDecimal.ROUND_HALF_UP) 
                    .toPlainString() +"MB";  
        } 
   
        doubleteraBytes = gigaByte / 1024; 
        if(teraBytes < 1) { 
            BigDecimal result3 =new BigDecimal(Double.toString(gigaByte)); 
            returnresult3.setScale(2, BigDecimal.ROUND_HALF_UP) 
                    .toPlainString() +"GB";  
        } 
        BigDecimal result4 =new BigDecimal(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

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