In Baidu Map API, how to use Java to calculate the distance between two points and display it on the map?

In Baidu Map API, how to use Java to calculate the distance between two points and display it on the map?

Baidu Map API is a powerful geographical information development tool that provides a variety of functions and interfaces for developers to use. One of the commonly used functions is to calculate the distance between two points and display the result on the map. This article will introduce how to use Java language to implement this function and provide corresponding code examples.

To develop using Baidu Map API, you first need to apply for a developer account on the official website and create a new application. During the process of creating an application, a unique API key will be obtained, which is used to call the API interface.

Next, we need to download the Java SDK of Baidu Map API. The relevant download link can be found on the official website. Import the downloaded SDK into the Java project and introduce the corresponding classes into the code.

The following is a complete sample code that shows how to use Baidu Map API to calculate the distance between two points and display the result on the map.

import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.utils.DistanceUtil;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MarkerOptions;
import com.baidu.mapapi.map.OverlayOptions;

public class DistanceCalculator {
    public static void main(String[] args) {
        // 创建地图视图
        MapView mapView = new MapView();
        BaiduMap baiduMap = mapView.getMap();

        // 定义两个坐标点
        LatLng point1 = new LatLng(40.058973, 116.307708);  // 北京
        LatLng point2 = new LatLng(31.222965, 121.505821);  // 上海

        // 计算两点间的距离（单位：米）
        double distance = DistanceUtil.getDistance(point1, point2);

        // 在地图上添加标记点
        OverlayOptions option1 = new MarkerOptions().position(point1).title("北京");
        OverlayOptions option2 = new MarkerOptions().position(point2).title("上海");
        baiduMap.addOverlay(option1);
        baiduMap.addOverlay(option2);

        // 移动地图中心点到第一个坐标点
        baiduMap.setMapStatus(MapStatusUpdateFactory.newLatLng(point1));

        // 在控制台输出结果
        System.out.println("两点间的距离为：" + distance + "米");
    }
}

In the above code, we first create an instance of the map view and obtain the map object. Then, two latitude and longitude coordinate points are defined, namely the coordinates of Beijing and Shanghai. Then, use the DistanceUtil.getDistance() method to calculate the distance between the two coordinate points, and output the result to the console. Finally, by calling the baiduMap.addOverlay() method, two marker points are added to the map, and the map center point is moved to the first coordinate point.

By running the above code, you can see the calculated distance between two points in the console and see the corresponding marker point on the map.

In summary, to use Java language to calculate the distance between two points and display the results on the map, you only need to use the corresponding classes and methods provided by Baidu Map API. In addition, developers can also perform more customization and expansion according to their own needs, such as adding paths, adjusting map display, etc. Baidu Map API provides detailed documentation and sample code to help developers better understand and use the API.

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