急求助，在地图是绘制两公交站点之间的线路，为何线条不连续？

想将地图上的两个公交站点用线条连接，已经获得了两点之间相关的8个坐标，打算通过
drawLine(float pts[], Paint paint)将8个点相连接，但是奇怪的是线段不连续，两两相连，但没有连成一线，大侠们帮我看看问题出在哪了代码如下：                         ......
                             Projection proj = mapView.getProjection();                             float[] pts = new float[gps.size()*2];                                                        for(int i=0;i<gps.size();i++)                                {                                        proj.toPixels(gps.get(i), out);                                        pts[2*i] = out.x;                                        pts[2*i+1] = out.y;                                }                        paint.setAntiAlias(true);                        paint.setStrokeWidth(5);                        paint.setAlpha(120);                        paint.setColor(Color.BLUE);                        canvas.drawLines(pts, paint);                        }
                        ......