Android 地图坐标

Question

我收到来自 Api 的 json 回复。响应如下所示。

{
 "CarsList": [{
 "coordinate": {
 "latitude": 53.46036882190762,
 "longitude": 9.909716434648558
 },
 "heading": 344.19529122029735
 },
 {
 "coordinate": {
 "latitude": 53.668806556867445,
 "longitude": 10.019908942943804
 },
 "heading": 245.2005654202569
 },
 {
 "coordinate": {
 "latitude": 53.58500747958201,
 "longitude": 9.807045083858156
 },
 "heading": 71.63840043828377
 }
 ]
}

我需要使用 json 响应数据创建自定义列表项。 我正在使用纬度和经度来获取位置。我对“标题”参数代表什么感到困惑。请帮我弄清楚这个“标题”参数的用途。提前致谢。

Answer 1

这里是 google documentation 中标题的定义：

When navigating on a sphere, a heading is the angle of a direction from a fixed reference point, usually true north. Within the Google Maps API, a heading is defined in degrees from true north, where headings are measured clockwise from true north (0 degrees).

你也可以直观地看到它是如何计算的：

https://developers.google.com/maps/documentation/javascript/examples/geometry-headings