How to call the Amap API through Java code to implement the geofence alarm function

How to call the Amap API through Java code to implement the geofence alarm function

Geofencing is a commonly used location service function. It can trigger when the user enters or leaves based on the geographical location range set by the user. An alarm is issued within this range. In practical applications, the Amap API can be called through Java code to implement the geofence alarm function. This article will introduce how to use Java code to call the Amap API and provide code examples.

First, you need to apply for a developer account on the Amap open platform and obtain the API application key. Next, the relevant Java SDK needs to be introduced into the Java project, and dependencies can be managed through tools such as Maven.

1. Create a geofence

Using the Amap API, you can create a geofence object. First, you need to import the relevant classes:

import com.amap.api.fence.*;
import com.amap.api.fence.model.*;

Then, you can use the following code to create a location point:

PointFence.Point point = new PointFence.Point(116.480983, 39.989628);

Next, you can use the following code to create a geofence object and set the fence shape to a circle Shape, and specify the center point and radius:

PointFence fence = new PointFence(point, 100);

2. Set the geofence alarm callback

In the Java code, you need to set the geofence alarm callback so that when the user enters or leaves the fence, to notification. First, you need to implement the OnFenceListener interface and implement its methods:

public class MyFenceListener implements OnFenceListener {

    public void onCreateFenceCallback(CreateFenceResult createFenceResult, String s) {
        // 围栏创建完成后的回调，可以在这里处理围栏创建成功或失败的情况
    }

    public void onUpdateFenceCallback(UpdateFenceResult updateFenceResult, String s) {
        // 围栏更新完成后的回调，可以在这里处理围栏更新成功或失败的情况
    }

    public void onDeleteFenceCallback(DeleteFenceResult deleteFenceResult, String s) {
        // 围栏删除完成后的回调，可以在这里处理围栏删除成功或失败的情况
    }

    public void onStatusChanged(LocationStatusInfo locationStatusInfo, List<GeoFence> list) {
        // 用户位置状态发生变化时的回调，可以在这里处理用户进入或离开围栏的情况
        for (GeoFence fence : list) {
            // 获取围栏的名称和状态
            String fenceName = fence.getFenceName();
            int fenceStatus = fence.getStatus();
            if (fenceStatus == GeoFence.STATUS_IN) {
                // 用户进入围栏
                System.out.println("用户进入围栏：" + fenceName);
            } else if (fenceStatus == GeoFence.STATUS_OUT) {
                // 用户离开围栏
                System.out.println("用户离开围栏：" + fenceName);
            }
        }
    }
}

3. Add the geofence to the map

In the Java code, you need to add the geofence to on the map for positioning and alarming. First, you need to create a GeoFenceClient object and set the relevant properties:

GeoFenceClient fenceClient = new GeoFenceClient(context);
fenceClient.setActivateAction(GeoFenceClient.GEOFENCE_IN | GeoFenceClient.GEOFENCE_OUT);
fenceClient.createPendingIntent("com.example.myfence.action.GEOFENCE");
fenceClient.setOnTriggerListener(new MyFenceListener());

Then, you can use the following code to add the geofence to the map:

fenceClient.addGeoFence(fence);

4. Start geography Fence service

In the Java code, the geofence service needs to be started in order to start monitoring the user’s location status:

fenceClient.start();

5. Complete sample code

The following is a complete Java sample code demonstrates how to use Java code to call the Amap API to implement the geofence alarm function:

import com.amap.api.fence.*;
import com.amap.api.fence.model.*;

public class Main {

    public static void main(String[] args) {
        // 创建一个位置点
        PointFence.Point point = new PointFence.Point(116.480983, 39.989628);

        // 创建一个地理围栏对象
        PointFence fence = new PointFence(point, 100);

        // 创建一个地理围栏告警回调
        MyFenceListener fenceListener = new MyFenceListener();

        // 创建一个地理围栏客户端
        GeoFenceClient fenceClient = new GeoFenceClient(context);
        fenceClient.setActivateAction(GeoFenceClient.GEOFENCE_IN | GeoFenceClient.GEOFENCE_OUT);
        fenceClient.createPendingIntent("com.example.myfence.action.GEOFENCE");
        fenceClient.setOnTriggerListener(fenceListener);

        // 将地理围栏添加到地图上
        fenceClient.addGeoFence(fence);

        // 启动地理围栏服务
        fenceClient.start();
    }
}

Through the above steps, we can use Java code to call the Amap API to implement the geofence alarm function. By setting up geofences and alarm callbacks, we can monitor the user's location status in real time and perform corresponding processing when the user enters or leaves the fence. This function can be widely used in regional alarm, electronic fence and other scenarios to provide more accurate and convenient location services.

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