是否有可能很容易地在SD卡上的文件夹的大小？我用一个文件夹的图像缓存，并想present所有缓存图像的总大小。有没有办法来此除了遍历每个文件？它们都位于同一个文件夹内？

Is it possible to easily get the size of a folder on the SD card? I use a folder for caching of images, and would like to present the total size of all cached images. Is there a way to this other than iterating over each file? They all reside inside the same folder?

推荐答案

刚刚经历的所有文件，总结它们的长度：

Just go through all files and sum the length of them:

/**
 * Return the size of a directory in bytes
 */
private static long dirSize(File dir) {

    if (dir.exists()) {
        long result = 0;
        File[] fileList = dir.listFiles();
        for(int i = 0; i < fileList.length; i++) {
            // Recursive call if it's a directory
            if(fileList[i].isDirectory()) {
                result += dirSize(fileList [i]);
            } else {
                // Sum the file size in bytes
                result += fileList[i].length();
            }
        }
        return result; // return the file size
    }
    return 0;
}

注：功能手写的，因此无法编译

NOTE: Function written by hand so it could not compile!

编辑：。递归调用固定

编辑：dirList.length改为fileList.length

EDITED: dirList.length changed to fileList.length.