Amap API document analysis: Java implements location search function

Amap API document analysis: Java implements location search function

Introduction:
Nowadays, map services play an important role in our lives. As one of the most mainstream map service providers in China, Amap's API documentation provides a wealth of functions and interfaces, bringing developers more convenient map service integration. This article will use Java language as an example to analyze the Amap API document, implement the location search function, and provide code examples.

Step 1: Obtain Developer Key
First, before using the Amap Map API, we need to register an Amap developer account and apply for a developer Key. Simply log in to the AMAP open platform (https://lbs.amap.com/) and create a project to get the developer key.

Step 2: Introduce the Java SDK of the Amap Map API
In the Java project, we can interact with the Amap Map API by introducing the Java SDK of the Amap Map API. Amap SDK provides a wealth of classes and methods to facilitate developers to perform map-related operations.

In the Maven project, we can add the following dependency code in pom.xml to introduce the Java SDK of Amap Map API:

    com.amap.api
    amap.api.maps
    1.3.1

Step 3: Implement the location search function
高The German Map API provides a POI (point of interest) search service to query locations through search keywords. The following is a Java sample code that implements the function of searching for locations through keywords.

import com.amap.api.maps.model.LatLng;
import com.amap.api.maps.model.Poi;
import com.amap.api.services.core.LatLonPoint;
import com.amap.api.services.core.PoiItem;
import com.amap.api.services.poisearch.PoiResult;
import com.amap.api.services.poisearch.PoiSearch;

import java.util.List;

public class LocationSearch {
    public static void main(String[] args) {
        // 高德地图开发者Key
        String key = "your_key";

        // 搜索关键字
        String keyword = "餐厅";

        // 搜索城市
        String city = "北京";

        // 创建POI搜索对象
        PoiSearch.Query query = new PoiSearch.Query(keyword, "", city);
        PoiSearch poiSearch = new PoiSearch(this, query);
        poiSearch.setBound(new PoiSearch.SearchBound(new LatLonPoint(39.904200,116.407396), 10000)); // 设置搜索范围，此处以北京市为例

        // 发起搜索
        poiSearch.setOnPoiSearchListener(new PoiSearch.OnPoiSearchListener() {
            @Override
            public void onPoiSearched(PoiResult result, int rCode) {
                if (rCode == 1000) {
                    // 搜索成功
                    List pois = result.getPois();
                    for (PoiItem poi : pois) {
                        // 解析搜索结果
                        String name = poi.getTitle();
                        String address = poi.getSnippet();
                        LatLng latLng = new LatLng(poi.getLatLonPoint().getLatitude(), poi.getLatLonPoint().getLongitude());
                        System.out.println(name + " " + address + " " + latLng.toString());
                    }
                } else {
                    // 搜索失败
                    System.out.println("搜索失败：" + rCode);
                }
            }

            @Override
            public void onPoiItemSearched(PoiItem poiItem, int i) {
            }
        });
        poiSearch.searchPOIAsyn(); // 异步搜索
    }
}

Analysis:

1. Import the required classes and methods: Import the required classes and methods at the beginning of the code.
2. Set the developer Key: Assign the applied developer Key to the variable key.
3. Set search keywords and cities: Assign the keywords and cities to be searched to the keyword and city variables.
4. Create POI search object: Create a POI search query object through PoiSearch.Query and make relevant settings.
5. Initiate a search: Call the poiSearch.searchPOIAsyn() method to initiate a search.
6. Parse the search results: parse and process the search results through the callback method onPoiSearched().

Summary:
Through the above steps, we have implemented the location search function through Java code, which can search based on keywords and cities and obtain search results. The Amap API provides a wealth of functions and interfaces, and developers can further develop and customize it according to their own needs.

Reference link:

1. AMAP Open Platform: https://lbs.amap.com/
2. AMAP API Document: https://lbs .amap.com/api/

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