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

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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!

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