VerticalTimelineDecoration.java

public class VerticalTimelineDecoration extends RecyclerView.ItemDecoration {

    Paint paintFill = null;
    Paint paintStrokeFill = null;
    Paint paintStroke = null;
    Paint paintDotLine = null;

    Paint paintText=null;
    Paint paintTextBold=null;

    int phase=0;
    public VerticalTimelineDecoration() {
        paintFill = new Paint();
        paintFill.setStyle(Paint.Style.FILL);
        paintFill.setColor(Color.BLACK);

        paintStroke = new Paint(Paint.ANTI_ALIAS_FLAG);
        paintStroke.setStyle(Paint.Style.STROKE);
        paintStroke.setColor(Color.BLACK);

        paintText = new Paint();
        paintText.setARGB(200, 254, 0, 0);
        paintText.setTextAlign(Paint.Align.CENTER);
        paintText.setTextSize(Utility.dpToPx(15));



        paintTextBold = new Paint();
        paintTextBold.setARGB(200, 0,149,255);
        paintTextBold.setTextAlign(Paint.Align.CENTER);
        paintTextBold.setTextSize(Utility.dpToPx(20));

        paintDotLine = new Paint();
        paintDotLine.setARGB(255, 0, 0,0);
        paintDotLine.setStyle(Paint.Style.STROKE);
        paintDotLine.setStrokeWidth(Utility.dpToPx(2));
        paintDotLine.setPathEffect(new DashPathEffect(new float[] {10,10}, phase));
    }

    @Override
    public void onDraw(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
        canvas.save();
        final int leftWithMargin = Utility.dpToPx(80);
        final int right = parent.getWidth();

        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();

            int adapterPosition = parent.getChildAdapterPosition(child);
            MovieAdapter.ViewHolder viewHolder = (MovieAdapter.ViewHolder) parent.getChildViewHolder(child);


            // draw divider
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + Utility.dpToPx(2);
            canvas.drawRect(new RectF(leftWithMargin,top,right,bottom), paintFill);


            // draw circle
            int pCenterX=Utility.dpToPx(40);
            int pCenterY=child.getTop()+(child.getBottom()-child.getTop())/2;
            int radius=Utility.dpToPx(20);
            paintStroke.setStrokeWidth(Utility.dpToPx(2));
            canvas.drawCircle(pCenterX,pCenterY,radius,paintStroke);


            // draw line (top of circle)
            Path mPath = new Path();
            mPath.moveTo(pCenterX, child.getTop());
            mPath.lineTo(pCenterX,pCenterY-radius);

            paintDotLine.setPathEffect(new DashPathEffect(new float[] {10,10}, 0));

            if(adapterPosition!=0)
                canvas.drawPath(mPath,paintDotLine);

            // draw line (bottom of circle)
            mPath = new Path();
            mPath.moveTo(pCenterX, pCenterY+radius);
            mPath.lineTo(pCenterX, child.getBottom());

            paintDotLine.setPathEffect(new DashPathEffect(new float[] {10,10}, 10));

            if(adapterPosition!=9)
                canvas.drawPath(mPath,paintDotLine);


            //draw text
            int xPos = pCenterX;
            int yPos = (int) ((pCenterY) - ((paintText.descent() + paintText.ascent()) / 2)) ;

            if(viewHolder.item.isChecked==false)
                canvas.drawText(String.valueOf(adapterPosition), xPos, yPos, paintText);
            else
                canvas.drawText(String.valueOf(adapterPosition), xPos, yPos, paintTextBold);


        }
        canvas.restore();    }

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

        outRect.left = Utility.dpToPx(80);
    }
}

nice :)

good job \m/