A must-read for Java developers: How to implement the geofencing function of Amap

<dependency>
   <groupId>com.amap.api</groupId>
   <artifactId>amap-java-sdk-core</artifactId>
   <version>4.5.0</version>
</dependency>

import com.amap.api.fence.FenceClient;
import com.amap.api.fence.GeoFence;
import com.amap.api.fence.GeoFenceClient;

public class FenceDemo {
    // 填入自己的Key
    private static final String DEVELOPER_KEY = "Your_Developer_Key";
    
    public static void main(String[] args) {
        // 实例化围栏客户端
        GeoFenceClient fenceClient = new GeoFenceClient();
        // 设置Key
        fenceClient.setKey(DEVELOPER_KEY);
        
        // 创建一个围栏对象
        GeoFence fence = new GeoFence();
        // 设置围栏ID
        fence.setFenceId("fence1");
        // 设置围栏的形状和位置，这里以圆形为例
        fence.setCenter(new DPoint(39.908692, 116.397477)); // 设置中心点的经纬度
        fence.setRadius(500); // 设置半径
        
        // 添加围栏
        fenceClient.addGeoFence(fence);
    }
}

import com.amap.api.fence.GeoFenceListener;

public class MyGeoFenceListener implements GeoFenceListener {
    @Override
    public void onGeoFenceCreateFinished(List<GeoFence> list, int i, String s) {
        // 监听围栏创建结果
        if (i == GeoFence.ADDGEOFENCE_SUCCESS) {
            // 围栏添加成功
            System.out.println("GeoFence added successfully!");
        } else {
            // 围栏添加失败
            System.out.println("GeoFence failed to add!");
        }
    }
    
    @Override
    public void onGeoFenceStatusChanged(GeoFenceStatus geoFenceStatus) {
        // 监听用户进出围栏的状态
        if (geoFenceStatus.getEventType() == GeoFenceStatus.INIT_STATUS) {
            // 忽略初始化状态
            return;
        }
        
        if (geoFenceStatus.getStatus() == GeoFenceStatus.GEOFENCE_IN) {
            // 用户进入围栏
            System.out.println("User entered the GeoFence!");
        } else if (geoFenceStatus.getStatus() == GeoFenceStatus.GEOFENCE_OUT) {
            // 用户离开围栏
            System.out.println("User left the GeoFence!");
        }
    }
}

public class FenceDemo {
    // ...
    
    public static void main(String[] args) {
        // ...
        
        // 设置围栏监听器
        MyGeoFenceListener fenceListener = new MyGeoFenceListener();
        fenceClient.setGeoFenceListener(fenceListener);
        
        // 启动监测
        fenceClient.createPendingIntent(); // 创建PendingIntent对象
        fenceClient.startGeoFence(); // 启动围栏监测
    }
}