如何获取缓存目录的确切大小:android [英] How to get the exact size of cache directory : android

问题描述

需要:我只是想获取手机中安装的每个应用程序的占用缓存大小.

NEED: I simply trying to get occupied cache size of each application which is installed in my phone.

我的方法:

PackageManager packageManager = getPackageManager();
List<ApplicationInfo> packages = packageManager.getInstalledApplications(PackageManager.GET_META_DATA);

for (ApplicationInfo packageInfo : packages) 
{
    try 
    {
        Context mContext = createPackageContext(packageInfo.packageName, CONTEXT_IGNORE_SECURITY);
        File cacheDirectory = mContext.getCacheDir();
        if(cacheDirectory==null)
        {
            cacheArrayList.add("0");
        }
        else
        {
            cacheArrayList.add(String.valueOf(cacheDirectory.length()/1024));
        }
    }
    catch (NameNotFoundException e)
    {
        e.printStackTrace();
    }
}

结果:如果目录为null，则返回0(作为条件).但是如果目录存在，则总是返回4 Kb.我按照以下过程签出了我的应用程序的缓存:

RESULT: If directory is null it returning 0 (as condition). But if directory existing its returning 4 Kb always. I checked out cache of my apps by following the process:

设置:->应用程序:->应用程序名称

Settings:->Apps:->ApplicationName

但是我在那里找到了它的0B.

But I found its 0B there.

为什么有人可以解释它的发生?以及如何获取缓存的确切大小?

Why its happening can someone explain? and How do I get exact size of cache?

推荐答案

目录的调用长度并不总是返回正确的大小.您可以尝试遍历文件列表并累加所有文件大小以获得总目录大小.

Calling length on a directory doesn't always return the correct size. You could try to iterate over the file list and add up all file sizes to get the total directory size.

赞:

long size = 0;
File[] files = cacheDirectory.listFiles();
for (File f:files) {
    size = size+f.length();
}

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