In the Baidu Map API, how to use Java to implement the geofencing function and trigger the corresponding events?

In the Baidu Map API, how to use Java to implement the geofence function and trigger the corresponding events?

Geofencing refers to setting a certain range of areas in geographical space, and corresponding events can be triggered based on whether a certain location is within this area. In the Baidu Map API, we can easily use Java to implement the geofencing function and trigger corresponding events when entering or leaving the fenced area.

First of all, we need to introduce Baidu Map’s Java SDK, which can manage project dependencies through Maven. Add the following dependencies in the pom.xml file:

<dependency>
    <groupId>com.github.binarywang</groupId>
    <artifactId>baidumap-java-sdk</artifactId>
    <version>4.1.0</version>
</dependency>

Next, we can use the API provided by Baidu Maps in Java code to implement the geofencing function. The following is a simple example:

import com.github.binarywang.baidumap.BaiduMapApiFactory;
import com.github.binarywang.baidumap.bean.geofence.*;
import com.github.binarywang.baidumap.service.BaiduMapService;

import java.util.ArrayList;
import java.util.List;

public class GeofenceDemo {

    private static final String AK = "your_baidu_map_ak";

    public static void main(String[] args) {
        BaiduMapService baiduMapService = BaiduMapApiFactory.createBaiduMapService(AK);

        // 创建一个围栏
        GeofenceCreateRequest request = new GeofenceCreateRequest();
        request.setName("MyGeofence");
        request.setDesc("MyGeofence Description");
        request.setActiveTime("00:00-23:59");
        request.setRepeat(1);
        request.setFenceShape(new GeofenceShape.Circle(120.12345, 30.12345, 1000));

        GeofenceCreateResult result = baiduMapService.createGeofence(request);
        if (result.isSuccess()) {
            String fenceId = result.getFenceId();
            System.out.println("地理围栏创建成功，围栏ID：" + fenceId);

            // 给围栏添加一个触发事件
            GeofenceCreateMonitoredpersonRequest personRequest = new GeofenceCreateMonitoredpersonRequest();
            personRequest.setFenceId(fenceId);
            personRequest.setMonitoredPerson("your_monitored_person");
            personRequest.setMonitoredStatus(1);
            personRequest.setEntityName("your_entity_name");
            personRequest.setEntityDesc("Entity Description");
            personRequest.setAlarmCondition(new GeofenceCreateMonitoredpersonRequest.AlarmCondition(1));
            
            GeofenceCreateMonitoredpersonResult personResult = baiduMapService.createGeofenceMonitoredperson(personRequest);
            if (personResult.isSuccess()) {
                System.out.println("触发事件创建成功");
            } else {
                System.out.println("触发事件创建失败：" + personResult.getMessage());
            }
        } else {
            System.out.println("地理围栏创建失败：" + result.getMessage());
        }
    }
}

In the above example, we first use BaiduMapApiFactory to create a BaiduMapService object and need to pass in our own Baidu Map AK (Access Key). Then, we create a fence object, set the name, description, effective time and other properties of the fence, and specify the shape of the fence to be circular.

Next, we call the createGeofence method of BaiduMapService to create a geofence, passing in the fence object as a parameter. If the creation is successful, we can get the unique ID of the fence (fenceId).

Then, we can add a trigger event to the fence. In the example, we created a GeofenceCreateMonitoredpersonRequest object and set the parameters for triggering the event, including fence ID, monitored person, trigger status, etc. Then call the createGeofenceMonitoredperson method of BaiduMapService to create a trigger event.

Finally, by judging whether the creation result is successful or not, you can know whether the geofence and trigger event are successfully created.

The above is a sample code that uses Java to implement the geofencing function of Baidu Map API and trigger the corresponding events. You can further adjust and expand according to actual needs. Hope this article can be helpful to you!

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