How to use Java code to implement dragging map events on Baidu Map and obtain the longitude and latitude of the current map center point?

How to use Java code to implement dragging map events on Baidu Map and obtain the longitude and latitude of the current map center point?

Map applications are a common function in modern life. We often use maps to find routes, locate locations, etc. Baidu Map is one of the most commonly used map applications in China. It provides a rich API interface so that developers can integrate map functions into their own applications.

In this article, we will introduce how to use Java code to implement dragging map events on Baidu maps and obtain the latitude and longitude of the current map center point. First, we need to prepare some necessary resources. Please make sure you have registered a Baidu Maps developer account and obtained the corresponding developer key (ak).

Next, we will use Baidu Map’s Java SDK. The specific steps are as follows:

Step 1: Introduce Baidu Map Java SDK

First, we need to introduce Baidu Java SDK for maps. Add the following dependencies in the project's pom.xml file:

<dependencies>
    <dependency>
        <groupId>com.baidu</groupId>
        <<artifactId>baidu-map-java-sdk</artifactId>
        <version>3.0.0</version>
    </dependency>
</dependencies>

Step 2: Create a map object

In Java code, we need to create a map object in order to operate the map. We can use the BaiduMap class to create a map object. The code example is as follows:

BaiduMap baiduMap = new BaiduMap();

Step 3: Set up the map event listener

In order to implement the drag map event, we need Set up a map event listener. In this listener, we can handle the map drag event and obtain the latitude and longitude of the current map center point. The code example is as follows:

baiduMap.setOnMapStatusChangeListener(new BaiduMap.OnMapStatusChangeListener() {
    @Override
    public void onMapStatusChangeStart(MapStatus mapStatus) {
        // 地图状态开始改变时
    }

    @Override
    public void onMapStatusChange(MapStatus mapStatus) {
        // 地图状态改变中
    }

    @Override
    public void onMapStatusChangeFinish(MapStatus mapStatus) {
        // 地图状态改变结束时
        LatLng center = mapStatus.target; // 获取当前地图中心点的经纬度
        double latitude = center.latitude; // 获取当前地图中心点的纬度
        double longitude = center.longitude; // 获取当前地图中心点的经度
        System.out.println("当前地图中心点的经纬度：" + latitude + ", " + longitude);
    }
});

Step 4: Start the map

Finally, we need to start the map so that it can be displayed on the interface. The code example is as follows:

baiduMap.start();

Through the above steps, we have completed the operation of dragging the map event on the Baidu map and obtaining the longitude and latitude of the current map center point. You can add other related functions to the map event listener as needed, such as displaying the location name of the current center point, etc.

Summary

This article introduces how to use Java code to implement dragging map events on Baidu maps and obtain the longitude and latitude of the current map center point. Baidu Map's Java SDK provides a wealth of functions and interfaces, allowing developers to carry out customized development according to their own needs. I hope this article helps you, and if you have any questions or suggestions about this, please feel free to ask. I wish you success in map application development!

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