RecyclerView divider ItemDecoration recyclerView.addItemDecoration( new TelsieDividerItemDecoration(ContextCompat.getDrawable(getContext(), R.drawable.telsie_divider), 32, 16)); #tags: android-list

TelsieDividerItemDecoration.java

public class TelsieDividerItemDecoration extends RecyclerView.ItemDecoration {

    private Drawable mDivider;
    private int mLeftMargin;
    private int mRightMargin;

    /**
     *
     * @param divider
     * @param left left margin of the divider, unit DP
     * @param right right margin of the divider, unit DP
     */
    public TelsieDividerItemDecoration(Drawable divider, int left, int right) {
        mDivider = divider;
        mLeftMargin = left;
        mRightMargin = right;
    }

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

        if (parent.getChildAdapterPosition(view) == 0) {
            return;
        }

        outRect.top = mDivider.getIntrinsicHeight();
    }

    @Override
    public void onDraw(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
        int dividerLeft = parent.getPaddingLeft() + (int) ViewUtils.getPixelValueFromDIP(parent.getContext(), mLeftMargin);
        int dividerRight = parent.getWidth() - parent.getPaddingRight() - (int) ViewUtils.getPixelValueFromDIP(parent.getContext(), mRightMargin);

        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount - 1; i++) {
            View child = parent.getChildAt(i);

            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();

            int dividerTop = child.getBottom() + params.bottomMargin;
            int dividerBottom = dividerTop + mDivider.getIntrinsicHeight();

            mDivider.setBounds(dividerLeft, dividerTop, dividerRight, dividerBottom);
            mDivider.draw(canvas);
        }
    }
}