Android Google Maps API 网络服务用于网络定位、计算路线、获取经纬度、获取详细地址等

extends:http://blog.csdn.net/h7870181/article/details/12505883

Google Maps API 网络服务

官网地址 ：

https://developers.google.com/maps/documentation/webservices/?hl=zh-cn

其实就是一些接口，供我们调用，如：

1、根据地址获取经纬度

http://maps.google.com/maps/api/geocode/json?address=北京&language=zh-CN&sensor=false

2、计算路线数据

http://maps.googleapis.com/maps/api/directions/json?origin=北京&destination=上海&sensor=false&mode=driving

3、根据经纬度获取详细地址

http://maps.google.com/maps/api/geocode/json?latlng="latlng"&language=zh-CN&sensor=false

等等还有很多，大家可以自己去找找

给大家介绍一下如果利用这些接口

实现网络定位：

首先获取经纬度

/**
 * 获取本地
 * @param context
 * @return
 */
public String getLocation(Context context){
    LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
       // 返回所有已知的位置提供者的名称列表，包括未获准访问或调用活动目前已停用的。
       //List<String> lp = lm.getAllProviders();
       Criteria criteria = new Criteria();
       criteria.setCostAllowed(false);
       //设置位置服务免费
       criteria.setAccuracy(Criteria.ACCURACY_COARSE); //设置水平位置精度
        //getBestProvider 只有允许访问调用活动的位置供应商将被返回
       String  providerName = lm.getBestProvider(criteria, true);  

       if (providerName != null)
       {
           Location location = lm.getLastKnownLocation(providerName);
           if(location!=null){
            //获取维度信息
            double latitude = location.getLatitude();
            //获取经度信息
            double longitude = location.getLongitude();
            return latitude+","+longitude;
           }
       }
       return "";
}  

调用API，我这里写了一个工具类

package com.techrare.utils;  

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;  

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;  

public class MapsApiUtils {
    private static MapsApiUtils mapsApiUtils = new MapsApiUtils();  

    /**
     * 单例模式
     *
     * @return
     */
    synchronized public static MapsApiUtils getInstance() {
        return mapsApiUtils;
    }  

    /**
     * 根据API地址和参数获取响应对象HttpResponse
     *
     * @param params
     * @param url
     * @return
     */
    private HttpResponse post(Map<String, Object> params, String url) {  

        HttpClient client = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);
        httpPost.addHeader("charset", HTTP.UTF_8);
        httpPost.setHeader("Content-Type","application/x-www-form-urlencoded; charset=utf-8");
        HttpResponse response = null;
        if (params != null && params.size() > 0) {
            List<NameValuePair> nameValuepairs = new ArrayList<NameValuePair>();
            for (String key : params.keySet()) {
                nameValuepairs.add(new BasicNameValuePair(key, (String) params.get(key)));
            }
            try {
                httpPost.setEntity(new UrlEncodedFormEntity(nameValuepairs,HTTP.UTF_8));
                response = client.execute(httpPost);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (RuntimeException e) {
                e.printStackTrace();
            }
        } else {
            try {
                response = client.execute(httpPost);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return response;
    }  

    /**
     * 得到JSON值
     *
     * @param params
     * @param url
     * @return
     */
    private Object getValues(Map<String, Object> params, String url) {
        String token = "";
        HttpResponse response = post(params, url);
        if (response != null) {
            try {
                token = EntityUtils.toString(response.getEntity());
                response.removeHeaders("operator");
            } catch (ParseException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return token;
    }  

    /**
     * 根据google API 获取两地的路线
     * @param origin 起点
     * @param destination 终点
     * @param mode 出行方式 driving驾车，  walking步行， bicycling自行车, transit公交车
     * @param sensor 是否来自装有位置传感器的设备  true Or false
     * @return
     */
    public Object getRoutes(String origin, String destination) {
        String url = "http://maps.googleapis.com/maps/api/directions/json?origin="+ origin +"&destination="+ destination +"&sensor=false&mode=driving&region=zh";
        return getValues(null, url);
    }  

    /**
     * 根据经纬度 获取地理位置
     * LatLng 经纬度以逗号隔开  纬度,经度
     * @return
     */
    public Object getAddress(String latlng) {
        String url = "http://maps.google.com/maps/api/geocode/json?latlng="+latlng+"&language=zh-CN&sensor=false";
        return getValues(null, url);
    }  

    /**
     * 根据地址获取经纬度
     * @return
     */
    public Object getLatlng(String str) {
        String url = "http://maps.google.com/maps/api/geocode/json?address="+ str+"&language=zh-CN&sensor=false";
        return getValues(null, url);
    }
}  

调用getAddress()方法 传递经纬度来获取详细地址 返回的是JSON字符串，大家解析一下就可以

可以得到起点到终点的时间和路程

调用getRoutes() 方法，传起点和终点

MapsApiUtils.getInstance().getLatLng("39.90403,116.407526");  

根据地址获取经纬度