Need help saving data using external storage

343740 pts.
Tags:
SD card
Storage
One of my friends wants to save some data in his external directory (SD card) but he's been having an odd problem. He's using "Environment.getExternalStorageDirectory() which is returning mnt/sdcard. Then he wants to create two folders in the directory so this is what he's using:
File main = new File(getExternalStorageDirectory() + "/my_app/some_data");
if(!main.isDirectory())
    main.mkdirs();
This should make the directory "mnt/sdcard/my_app/some_data" but it's actually creating "mnt/sdcard/my_app/mnt/sdcard/my_app/some_data." Anyone know why this is happening or the proper fix?

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