I am supposed to develop an adroid app that displays a picture on the camera view, when you point the camera in the right direction, representing a point in the sky with given latitude, longitude and altitude. I found an algorithm for doing this here: Perspective Projection in Android in an augmented reality application
当你将相机指向正确的方向时，我应该开发一个在相机视图上显示图片的adroid应用程序，代表天空中具有给定纬度，经度和海拔高度的点。我在这里找到了一个算法：Android中的Perspective Projection在增强现实应用程序中
But I am having trouble to understand it and implemented it. Does someone have code example on this subject?
但我很难理解并实施它。有人在这个问题上有代码示例吗？