How can I get the size of a folder on SD card in Android?

Question

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?

Answer 1

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();         if (fileList != null) {             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; } 

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

Answer 2

Here's some code that avoids recursion, and also calculates the physical size instead of the logical size:

public static long getFileSize(final File file) {     if (file == null || !file.exists())         return 0;     if (!file.isDirectory())         return file.length();     final List<File> dirs = new LinkedList<>();     dirs.add(file);     long result = 0;     while (!dirs.isEmpty()) {         final File dir = dirs.remove(0);         if (!dir.exists())             continue;         final File[] listFiles = dir.listFiles();         if (listFiles == null || listFiles.length == 0)             continue;         for (final File child : listFiles) {             result += child.length();             if (child.isDirectory())                 dirs.add(child);         }     }     return result; }