从用户位置查找数组中最近的经度和纬度 - Android Studio

Question

以下代码对我最近完成的 iOS 应用程序很有帮助：

var closestLocation: CLLocation?
var smallestDistance: CLLocationDistance?

for location in locations {
  let distance = currentLocation.distanceFromLocation(location)
  if smallestDistance == nil || distance < smallestDistance {
    closestLocation = location
    smallestDistance = distance
  }
}

我的问题很简单：对于 Android Studio，这段代码在 Java 中看起来如何？

这是我在 Java 和 Android 工作室的第一个 运行，非常感谢任何帮助。

Answer 1

Location closestLocation = null;
float smallestDistance = -1;

for(Location location:mLocationsList){
float distance  = currentLocation.distanceTo(location);
 if(smallestDistance == -1 || distance < smallestDistance) {
    closestLocation = location
    smallestDistance = distance
  }
}

其中 mLocationsList 是位置对象的可迭代集合并且 currentLocation 已经设置

Answer 2

看起来像这样（locations 需要是可迭代的并且必须设置 userLocation）：

    Location closest;
    float smallestDistance = Float.MAX_VALUE;
    for (Location l : locations) {
        float dist = l.distanceTo(userLocation);
        if (dist < smallestDistance) {
            closest = l;
            smallestDistance = dist;
        }
    }

Answer 3

您应该考虑使用位置 class。它用于存储纬度和经度的位置。它还具有用于计算点之间距离的预定义函数 - distanceBetween()。

Location closestLocation;
int smallestDistance = -1;

假设位置是 ArrayList<Location>()

for(Location location : locations){
    int distance = Location.distanceBetween(closestLocation.getLatitude(),
                           closestLocation.getLongitude(),
                           location.getLatitude(),
                           location.getLongitude());
    if(smallestDistance == -1 || distance < smallestDistance){
        closestLocation = location;
        smallestDistance = distance;
    }
}