Use writeStringList for selection parceling.

        /**

         * Used by CREATOR.

         */

        private Selection(String directoryKey, List<String> selection) {

        private Selection(String directoryKey, Set<String> selection) {

            mDirectoryKey = directoryKey;

            mSelection = new HashSet<String>(selection);

            mSelection = selection;

            mProvisionalSelection = new HashSet<String>();

        }

        public void writeToParcel(Parcel dest, int flags) {

            dest.writeString(mDirectoryKey);

            dest.writeList(new ArrayList<>(mSelection));

            dest.writeStringList(new ArrayList<>(mSelection));

            // We don't include provisional selection since it is

            // typically coupled to some other runtime state (like a band).

        }

            @Override

            public Selection createFromParcel(Parcel in, ClassLoader loader) {

                return new Selection(

                        in.readString(),

                        in.readArrayList(loader));

                String directoryKey = in.readString();

                ArrayList<String> selected = new ArrayList<>();

                in.readStringList(selected);

                return new Selection(directoryKey, new HashSet<String>(selected));

            }

            @Override