检查纬度和经度是否在圆圈内 [英] Check if a latitude and longitude is within a circle

问题描述

看这个图:

我想知道的是:

1. 如何在给定经纬度和距离(10 公里)的情况下创建区域(圆)
2. 如何检查(计算)纬度和经度是在区域内还是区域外

我希望您能提供 Java 代码示例或专门针对带有 Google Maps API V2 的 Android 代码示例

I would prefer if you can give me code example in Java or specifically for Android with Google Maps API V2

推荐答案

你基本上需要的是地图上两点之间的距离:

What you basically need, is the distance between two points on the map:

float[] results = new float[1];
Location.distanceBetween(centerLatitude, centerLongitude, testLatitude, testLongitude, results);
float distanceInMeters = results[0];
boolean isWithin10km = distanceInMeters < 10000;

如果您已经有 Location 对象:

If you have already Location objects:

Location center;
Location test;
float distanceInMeters = center.distanceTo(test);
boolean isWithin10km = distanceInMeters < 10000;

这是所用 API 的有趣部分:https://developer.android.com/reference/android/location/Location.html

Here is the interesting part of the API used: https://developer.android.com/reference/android/location/Location.html

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