RecyclerView implementation

Activity.java

// USAGE

// Data set
final ArrayList<ViewModel> viewModelArrayList = new ArrayList<>();
for (int i = 0; i < 100; i++) {
    viewModelArrayList.add(new Order(i, "VM Name " + i));
}

// Recyclerview 
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rv);
// Optimization
recyclerView.setHasFixedSize(true);
// Adapter
OrderAdapter adapter = new OrderAdapter(orderArrayList);
recyclerView.setAdapter(adapter);
// Setup onItemTouchHandler
ItemTouchHelper.Callback callback = new RVOnItemtouchHelper(adapter);
ItemTouchHelper helper = new ItemTouchHelper(callback);
helper.attachToRecyclerView(recyclerView);
// Layout Manager
recyclerView.setLayoutManager(new LinearLayoutManager(this));
// Set the divider
recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
// Handle on item click
recyclerView.addOnItemTouchListener(
        new RecyclerItemClickListener(this, new RecyclerItemClickListener
                .OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
              // Do something
            }
        })
);

DividerItemDecoration.java

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;

    private int mOrientation;

    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        setOrientation(orientation);
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }
    }

    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin +
                    Math.round(ViewCompat.getTranslationY(child));
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin +
                    Math.round(ViewCompat.getTranslationX(child));
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }
}

RecyclerItemClickListener.java

public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
    private OnItemClickListener mListener;

    public interface OnItemClickListener {
        public void onItemClick(View view, int position);
    }

    GestureDetector mGestureDetector;

    public RecyclerItemClickListener(Context context, OnItemClickListener listener) {
        mListener = listener;
        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
        View childView = view.findChildViewUnder(e.getX(), e.getY());
        if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
            mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
            return true;
        }
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }
}

rv_layout.xml

<android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/rv"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

<!--Add the below attribute when working with collapsible toolbar, donot put recyclerview under NestedScrollView-->
<!--app:layout_behavior="@string/appbar_scrolling_view_behavior"-->

RVAdapter.java

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.Viewholder> {
    private List<ViewModel> viewModelList;

    public RVAdapter(List<ViewModel> viewModelList) {
        this.viewModelList = viewModelList;
    }

    @Override
    public Viewholder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());

        View modelView = inflater.inflate(R.layout.item_view_rv, parent, false);

        return new Viewholder(modelView);
    }

    @Override
    public void onBindViewHolder(Viewholder holder, int position) {
        ViewModel viewModel = viewModelList.get(position);
        holder.txt_name.setText(viewModel.getName());
        holder.txt_id.setText(String.valueOf(viewModel.get_id()));
    }

    @Override
    public int getItemCount() {
        return viewModelList.size();
    }

    public static class Viewholder extends RecyclerView.ViewHolder{
        TextView txt_name, txt_id;

        public Viewholder(View itemView) {
            super(itemView);
            txt_id = (TextView) itemView.findViewById(R.id.textView_id);
            txt_name = (TextView) itemView.findViewById(R.id.textView_name);
        }
    }
    
    public void remove(int position) {
        viewModelList.remove(position);
        notifyItemRemoved(position);
    }

    public void swap(int firstPosition, int secondPosition) {
        Collections.swap(viewModelList, firstPosition, secondPosition);
        notifyItemMoved(firstPosition, secondPosition);
    }
}

RVOnItemtouchHelper.java

public class RVOnItemtouchHelper extends ItemTouchHelper.SimpleCallback {
    private RVAdapter rvAdapter;

    public RVOnItemtouchHelper(RVAdapter rvAdapter) {
        super(ItemTouchHelper.UP | ItemTouchHelper.DOWN, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);
        this.rvAdapter = rvAdapter;
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder dragged, RecyclerView.ViewHolder target) {
        rvAdapter.swap(dragged.getAdapterPosition(), target.getAdapterPosition());
        return false;
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder swipped, int direction) {
        switch (direction) {
            case ItemTouchHelper.LEFT:
                //Remove item
                rvAdapter.remove(swipped.getAdapterPosition());
                System.out.println("Swipped Left");
                break;
            case ItemTouchHelper.RIGHT:
                System.out.println("Swipped Right");
                break;
        }
    }
}

ViewModel.java

public class ViewModel {
    int _id;
    String name;

    public ViewModel(int _id, String name) {
        this._id = _id;
        this.name = name;
    }


    public int get_id() {
        return _id;
    }

    public String getName() {
        return name;
    }
}