使用GPS实时记录运动路线

主要思路就是使用list实时记录运动坐标 , 继承 Overlay，并重写draw方法，在draw方法中通过list的数值画出path。

首先声明list

private List<GeoPoint> gPointList = new ArrayList<GeoPoint>();

class MyOverlay extends Overlay { @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { // TODO Auto-generated method stub super.draw(canvas, mapView, shadow); //Log.i(TAG, "draw");地图变化时候不断重绘// 画笔 Paint paint = new Paint(); paint.setColor(Color.RED); paint.setDither(true); paint.setStyle(Paint.Style.STROKE); paint.setStrokeJoin(Paint.Join.ROUND); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStrokeWidth(2); Projection projection = mapView.getProjection(); Path path = new Path();if (gPointList.size()>1) {//2Point p1 = new Point(); projection.toPixels(gPointList.get(0), p1); path.moveTo(p1.x, p1.y); for (int i = 0; i < gPointList.size()-1; i++) {Point p2 = new Point(); projection.toPixels(gPointList.get(i+1), p2); path.lineTo(p2.x, p2.y); Log.i(TAG, ""+p2.x+""+p2.y);}canvas.drawPath(path, paint);// 画出路径 }} } 

显示在map上

//绘制路径

   	   gpoint1 = new GeoPoint((int) (lat * 1000000),   (int) (lng * 1000000));   gPointList.add(gpoint1);myOverlay = new MyOverlay();overlays.add(myOverlay);

4月20日 发现 如果放到线程里 貌似更好 可以设置多少时间取样

class ThreadGetRoute implements Runnable {public void run() {try {gpoint1 = new GeoPoint((int) (lat * 1000000),(int) (lng * 1000000));gPointList.add(gpoint1);myOverlay = new MyOverlay();overlays.add(myOverlay);Thread.sleep(10000);} catch (Exception e) {e.printStackTrace();}}}