find path of external SD card

/**
     * Returns all available external SD-Card roots in the system.
     *
     * @return paths to all available external SD-Card roots in the system.
     */
    public static String[] getStorageDirectories() {
        String[] storageDirectories;
        String rawSecondaryStoragesStr = System.getenv("SECONDARY_STORAGE");

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            List<string> results = new ArrayList<string>();
            File[] externalDirs = myContext.getExternalFilesDirs(null);
            for (File file : externalDirs) {
                String path = null;
                try {
                    path = file.getPath().split("/Android")[0];
                } catch (Exception e) {
                    e.printStackTrace();
                    path = null;
                }
                if (path != null) {
                    if ((Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && Environment.isExternalStorageRemovable(file))
                            || rawSecondaryStoragesStr != null && rawSecondaryStoragesStr.contains(path)) {
                        results.add(path);
                    }
                }
            }
            storageDirectories = results.toArray(new String[0]);
        } else {
            final Set<string> rv = new HashSet<string>();

            if (!TextUtils.isEmpty(rawSecondaryStoragesStr)) {
                final String[] rawSecondaryStorages = rawSecondaryStoragesStr.split(File.pathSeparator);
                Collections.addAll(rv, rawSecondaryStorages);
            }
            storageDirectories = rv.toArray(new String[rv.size()]);
        }
        return storageDirectories;
    }


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