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In Baidu Map API, how to use Java to calculate the driving time between two locations and display it on the map?

王林Original: 2023-07-29 10:01:101942browse

The Baidu Map API provides a wealth of functionality, including calculating the driving time between two locations and displaying it on the map. This article will introduce how to use Java to write code to implement this function.

First, we need to import the Java SDK of Baidu Map API. The download link for the Java SDK can be found on the official website of Baidu Map Open Platform. After the download is complete, import the jar file into the project's build path.

Next, we need to register a developer account on Baidu Maps Open Platform and create an application. After creating the application, you can obtain the access key (ak) in the application management page.

In the code, we first need to introduce the relevant package:

import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.utils.CoordinateConverter;
import com.baidu.mapapi.utils.DistanceUtil;
import com.baidu.mapapi.utils.RoutePlanUtils;

Then, we can use the following code to calculate the driving time between two locations:

String ak = "your_ak"; // 替换成自己的ak
String origin = "起点位置"; // 替换成起点位置的经纬度
String destination = "终点位置"; // 替换成终点位置的经纬度

// 创建坐标转换工具
CoordinateConverter converter = new CoordinateConverter();

// 设置原始坐标类型，百度地图坐标类型为BAIDU，可以根据实际情况进行调整
converter.from(CoordinateConverter.CoordType.COMMON);

// 设置起点位置
LatLng originLatLng = new LatLng(Double.parseDouble(origin.split(",")[0]), Double.parseDouble(origin.split(",")[1]));
converter.coord(originLatLng);
LatLng convertedOriginLatLng = converter.convert();

// 设置终点位置
LatLng destinationLatLng = new LatLng(Double.parseDouble(destination.split(",")[0]), Double.parseDouble(destination.split(",")[1]));
converter.coord(destinationLatLng);
LatLng convertedDestinationLatLng = converter.convert();

// 计算两个位置间的直线距离
double distance = DistanceUtil.getDistance(convertedOriginLatLng, convertedDestinationLatLng);

// 计算两个位置间的驾车时间
double drivingTime = RoutePlanUtils.calDrivingTime(distance);

System.out.println("驾车时间：" + drivingTime + "分钟");

In the above code, we first convert the longitude and latitude of the starting position and the ending position into the coordinate system of Baidu Map, and then use the DistanceUtil class to calculate the straight-line distance between the two positions. Finally, the driving time between two locations is calculated based on the straight-line distance through the calDrivingTime method of the RoutePlanUtils class.

To display driving directions for two locations on the map, you can use Baidu Maps' Web API. The following is a sample code:

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>Display driving route on Baidu Maps</title>
  <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=your_ak"></script>
</head>
<body>
  <div id="map" style="width: 500px; height: 400px;"></div>
  <script type="text/javascript">
    var map = new BMap.Map("map");
    var driving = new BMap.DrivingRoute(map, {renderOptions:{map: map, autoViewport: true}});
    var pointA = new BMap.Point(起点位置);
    var pointB = new BMap.Point(终点位置);
    driving.search(pointA, pointB);
  </script>
</body>
</html>

In the above code, we use the BMap.Map class to create a map instance, and then use the BMap.DrivingRoute class to create a driving route object. Display the route on the map by setting the map option in the renderOptions parameter. Fill in the longitude and latitude of the starting point and the ending point in pointA and pointB respectively.

To sum up, through the Java SDK of Baidu Map API, we can easily calculate the driving time between two locations and display it on the map.

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