Recyclerview Helper

Divider.java

public class Divider extends RecyclerView.ItemDecoration {

    private Drawable mDivider;
    private int mOrientation;

    public Divider(Context context, int orientation) {
        mDivider = ContextCompat.getDrawable(context, R.drawable.divider);
        if (orientation != LinearLayoutManager.VERTICAL) {
            throw new IllegalArgumentException("This Item Decoration can be used only with a RecyclerView that uses a LinearLayoutManager with vertical orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == LinearLayoutManager.VERTICAL) {
            drawHorizontalDivider(c, parent, state);
        }
    }

    private void drawHorizontalDivider(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left, top, right, bottom;
        left = parent.getPaddingLeft();
        right = parent.getWidth() - parent.getPaddingRight();
        int count = parent.getChildCount();
        for (int i = 0; i < count; i++) {
            View current = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) current.getLayoutParams();
            top = current.getBottom() + params.bottomMargin;
            bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == LinearLayoutManager.VERTICAL) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        }
    }
}

ItemOffsetDecoration

public class ItemOffsetDecoration extends RecyclerView.ItemDecoration {

    private int mItemOffset;
    private int spanCount;

    public ItemOffsetDecoration(int itemOffset) {
        mItemOffset = itemOffset;
    }

    public ItemOffsetDecoration(@NonNull Context context, @DimenRes int itemOffsetId, int spanCount) {
        this(context.getResources().getDimensionPixelSize(itemOffsetId));
        this.spanCount = spanCount;
    }

    @Override
    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent,
                               @NonNull RecyclerView.State state) {

        int position = parent.getChildAdapterPosition(view); // item position
        int column = position % spanCount; // item column
        outRect.left = mItemOffset - column * mItemOffset / spanCount; // spacing - column * ((1f / spanCount) * spacing)
        outRect.right = (column + 1) * mItemOffset / spanCount; // (column + 1) * ((1f / spanCount) * spacing)

        if (position < spanCount) { // top edge
            outRect.top = mItemOffset;
        }
        outRect.bottom = mItemOffset; // item bottom
    }
}