Android的折线 - 添加逐点 [英] Android Polyline - Adding point by point

问题描述

我目前有一个地图，并且每个10米我用LocationListener的刷新我的位置，并获得新的经度和纬度。现在，我希望用户走的路线会以红色线条显示。所以每次的OnLocationChange（）从LocationListener的类叫做，我想更新的最后一个位置和新位置之间的线路地图。

I'm currently having a map, and each 10 meters I use LocationListener to refresh my location and get the new Latitude and Longitude. Now I wish that the route the user is taking will be displayed with a red line. So everytime the OnLocationChange() from LocationListener class is called, I want to update the map with a line between the last location and the new location.

到目前为止，我已经添加了以下内容：

So far I've added the following:

private void initializeDraw() {
    lineOptions = new PolylineOptions().width(5).color(Color.RED);
    lineRoute = workoutMap.addPolyline(lineOptions);
}

在OnLocationChanged我称之为：

during the OnLocationChanged I call this:

drawTrail();

现在我应该怎么插入这个功能，这样每次添加新获得的位置作为一个点，并吸引了来自最后一行到新点的时间。

now what should I insert into this function so that each time it adds the newly attained location as a point and draws a line from the last to the new point.

感谢

推荐答案

首先翻译位置到经纬度：

LatLng newPoint = new LatLng(location.getLatitude(), location.getLongitude());

然后添加一个点的点现有的列表：

Then add a point to existing list of points:

List<LatLng> points = lineRoute.getPoints();
points.add(newPoint);
lineRoute.setPoints(points);

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