Find location of a removable SD card

Question

Is there an universal way to find the location of an external SD card?

Please, do not be confused with External Storage.

Environment.getExternalStorage

Answer 1

Since my original answer above, scanning vold is no longer viable across the various manufacturers.

I've developed a more reliable and straight forward method.

File mnt = new File("/storage");
if (!mnt.exists())
    mnt = new File("/mnt");

File[] roots = mnt.listFiles(new FileFilter() {

    @Override
    public boolean accept(File pathname) {
        return pathname.isDirectory() && pathname.exists()
                && pathname.canWrite() && !pathname.isHidden()
                && !isSymlink(pathname);
    }
});

roots will contain all the writeable root directories on the system, including any usb connected usb devices.

NOTE: The canWrite method needs the android.permission.WRITE_EXTERNAL_STORAGE permission.