急在map是绘制两公交站点之间的线路，为何线条不连续

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);

                        }
                        ......