Android:根据设备方向和用户位置将箭头指向目标(LatLng) [英] Android: Make an arrow point to a destination (LatLng) based on device orientation and user location
问题描述
我正在开发基于地理定位的Android应用程序,实际上这是一个指南。我真的需要这方面的帮助:
I am developing an Android app based on geolocation, It's a Guide actually. And I really need help in this part :
假设我们有:
Let's assume we have :
- 经度&地图中点(L)的纬度。
- 经度&用户所在点(I)的纬度。
- 显示箭头的活动。
如何让箭头指向L点? (当然,根据我的观点和设备的方向)
How can I make that arrow point to the point L ? (Based of course on the point I, and on the device's orientation)
我不是要求代码。这将是太多问。我只需要推理。或者一个简单的方法来做到这一点?图书馆?一个框架?数学公式?我真的无法在任何地方找到答案。
I am not asking for code. It would be too much asked. I Just need the reasoning . Or maybe a simple method to do this ? a library? a framework? mathematical formula ? I really can't find an answer anywhere.
对不起,如果已经有人问过。
Sorry if it has already been asked.
推荐答案
仅供参考,我的谷歌查询是
FYI, my google query was
两点之间的指南针方向
compass direction between two points
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