A must-read for Java developers: Walking path planning method for bus station query on Amap

Must-read for Java developers: Walking path planning method for bus station query on Amap

With the development of cities, public transportation systems have become one of the important ways for people to travel daily. In order to improve the convenience and efficiency of bus travel, Amap provides a rich bus station query function, and also supports the planning of walking paths between stations. This article will introduce how to use Java to develop and implement the walking path planning function of bus station query on Amap.

First, we need to introduce the Java SDK of Amap into the code. You can add the following dependencies to the Maven project:

<dependency>
  <groupId>com.amap.api</groupId>
  <artifactId>amap-java-sdk</artifactId>
  <version>1.4.0</version>
</dependency>

Next, we need to obtain the developer key of Amap. After registering an account on the AMAP open platform and creating an application, you can obtain the Key.

String apiKey = "yourApiKey";
AMapServices aMapServices = new AMapServices(apiKey);

First of all, we can obtain the bus stop information of the specified city through bus stop query. For example, query all bus stops in Beijing:

DistrictSearchQuery query = new DistrictSearchQuery();
query.setKeywords("北京市");
DistrictSearch districtSearch = new DistrictSearch(query);
DistrictResult districtResult = aMapServices.districtSearch(districtSearch);
List<DistrictItem> districtItems = districtResult.getDistrict();

for (DistrictItem districtItem : districtItems) {
    String districtName = districtItem.getName();
    List<BusStationItem> busStationItems = districtItem.getBusStations();
    for (BusStationItem busStationItem : busStationItems) {
        String busStationName = busStationItem.getBusStationName();
        System.out.println("District: " + districtName + ", Bus Station: " + busStationName);
    }
}

Next, we can use the longitude and latitude information of the bus stops to plan the walking path. For example, query the walking path from the starting site to the destination site:

LatLonPoint startPoint = new LatLonPoint(39.904984, 116.405285);  // 起始站点经纬度
LatLonPoint endPoint = new LatLonPoint(39.915599, 116.467402);  // 目的站点经纬度
RouteSearch.WalkRouteQuery query = new RouteSearch.WalkRouteQuery(new RouteSearch.FromAndTo(startPoint, endPoint));
RouteSearch routeSearch = new RouteSearch(this);  // this为当前的上下文
routeSearch.calculateWalkRouteAsyn(query);
routeSearch.setRouteSearchListener(new RouteSearch.OnRouteSearchListener() {
    @Override
    public void onBusRouteSearched(BusRouteResult busRouteResult, int i) {
        // 不需要处理
    }

    @Override
    public void onDriveRouteSearched(DriveRouteResult driveRouteResult, int i) {
        // 不需要处理
    }

    @Override
    public void onWalkRouteSearched(WalkRouteResult walkRouteResult, int i) {
        if (i == 1000) {
            if (walkRouteResult != null && walkRouteResult.getPaths() != null && walkRouteResult.getPaths().size() > 0) {
                WalkPath walkPath = walkRouteResult.getPaths().get(0);
                List<WalkStep> walkSteps = walkPath.getSteps();
                for (WalkStep walkStep : walkSteps) {
                    String instruction = walkStep.getInstruction();
                    System.out.println("Instruction: " + instruction);
                }
            }
        } else {
            System.out.println("步行路径规划失败");
        }
    }
});

Through the above code example, we can implement the walking path planning function of the Amap bus station query. Developers can expand and optimize functions according to their own needs to meet actual application scenarios. I hope this article can provide some help to Java developers in querying bus stations and planning walking routes on Amap.

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