HoverItemDecoration itemDecoration = new HoverItemDecoration(
        new HoveringCallback() {
            @Override
            public void attachToRecyclerView(@Nullable RecyclerView recyclerView) {
                super.attachToRecyclerView(recyclerView);
                addOnDropListener(new OnDroppedListener() {
                    @Override
                    public void onDroppedOn(RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                        Toast.makeText(
                                MainActivity.this,
                                "Dropped on position " + target.getAdapterPosition(),
                                Toast.LENGTH_SHORT).show();
                    }
                });
            }
        },
        new ItemBackgroundCallback() {
            private int hoverColor = Color.parseColor("#e9effb");

            @Override
            public int getDefaultBackgroundColor(@NonNull RecyclerView.ViewHolder viewHolder) {
                return Color.WHITE;
            }

            @Override
            public int getDraggingBackgroundColor(@NonNull RecyclerView.ViewHolder viewHolder) {
                return Color.WHITE;
            }

            @Override
            public int getHoverBackgroundColor(@NonNull RecyclerView.ViewHolder viewHolder) {
                return hoverColor;
            }
        });
itemDecoration.attachToRecyclerView(recyclerView);

Copyright 2018 Bogdan Kornev.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.