ANDROID_MARS学习笔记_S03_006_geocoding、HttpClient

一、简介

二、代码
1.xml
(1)AndroidManifest.xml

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.INTERNET"/>

2.java
(1)MainActivity.java

package com.location4;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.google.gson.Gson;

/**
 * 根据地址查询经纬度：
 * http://maps.google.com/maps/api/geocode/json?address=SFO&sensor=false
 *
 * 根据经纬度查询地址：
 * http://maps.google.com/maps/api/geocode/json?latlng=40.124356,-73.961472&sensor=false
 *
 * bounds的作用：在指定的经纬度范围内查询
 * http://maps.google.com/maps/api/geocode/json?address=SFO & bounds=39.125367,-118.326182|42.271635,-40.287321 & sensor=false
 *
 * region的作用：在给定国家代码的国家中查询（es：西班牙）
 * http://maps.google.com/maps/api/geocode/json?address=Toledo&sensor=false&region=es
 */

@SuppressLint("NewApi")
public class MainActivity extends Activity {

    private Button geocodingButton = null;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        
        geocodingButton = (Button)findViewById(R.id.geoButton);
        geocodingButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                //针对上一节中Geocoder服务不可用的情况，此处使用google maps中的服务替代
                //String url = "http://maps.google.com/maps/api/geocode/json?address=SFO&sensor=false";
                String url = "http://maps.google.com/maps/api/geocode/json?latlng=40.124356,-73.961472&sensor=false";
                HttpClient client = new DefaultHttpClient();
                StringBuilder responseData = new StringBuilder("");
                try {
                    //向指定的url发送http请求
                    HttpResponse response = client.execute(new HttpGet(url));
                    //取得服务器返回的响应
                    HttpEntity entity = response.getEntity();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent()));
                    String line = "";
                    while((line = reader.readLine()) != null) {
                        responseData.append(line);
                    }
                } catch (ClientProtocolException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                Gson gson = new Gson();
                GeoResult geoResult = gson.fromJson(responseData.toString(), GeoResult.class);
                System.out.println(responseData);
                System.out.println(geoResult);
            }
        });
    }
}

(2)GeoResult.java

package com.location4;

import java.util.List;

public class GeoResult {

    private String status;
    private List<Result> results;
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
    public List<Result> getResults() {
        return results;
    }
    public void setResults(List<Result> results) {
        this.results = results;
    }
    @Override
    public String toString() {
        return "GeoResult [status=" + status + ", results=" + results + "]";
    }
}

(3)Result.java

package com.location4;

import java.util.Arrays;

public class Result {

    private String[] types;
    private String formatted_address;
    private String place_id;
    public String getPlace_id() {
        return place_id;
    }
    public void setPlace_id(String place_id) {
        this.place_id = place_id;
    }
    public String[] getTypes() {
        return types;
    }
    public void setTypes(String[] types) {
        this.types = types;
    }
    public String getFormatted_address() {
        return formatted_address;
    }
    public void setFormatted_address(String formatted_address) {
        this.formatted_address = formatted_address;
    }
    @Override
    public String toString() {
        return "Result [types=" + Arrays.toString(types)
                + ", formatted_address=" + formatted_address + ", place_id="
                + place_id + "]";
    }
}

(4)http://maps.google.com/maps/api/geocode/json?latlng=40.124356,-73.961472&sensor=false

和http://maps.google.com/maps/api/geocode/xml?latlng=40.124356,-73.961472&sensor=false的返回结果分别如下：

{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "511",
               "short_name" : "511",
               "types" : [ "street_number" ]
            },
            {
               "long_name" : "Ocean Avenue",
               "short_name" : "Ocean Ave",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Sea Girt",
               "short_name" : "Sea Girt",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Monmouth County",
               "short_name" : "Monmouth County",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "New Jersey",
               "short_name" : "NJ",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "美国",
               "short_name" : "US",
               "types" : [ "country", "political" ]
            },
            {
               "long_name" : "08750",
               "short_name" : "08750",
               "types" : [ "postal_code" ]
            },
            {
               "long_name" : "2712",
               "short_name" : "2712",
               "types" : [ "postal_code_suffix" ]
            }
         ],
         "formatted_address" : "511 Ocean Ave, Sea Girt, NJ 08750美国",
         "geometry" : {
            "location" : {
               "lat" : 40.131507,
               "lng" : -74.028998
            },
            "location_type" : "ROOFTOP",
            "viewport" : {
               "northeast" : {
                  "lat" : 40.1328559802915,
                  "lng" : -74.02764901970851
               },
               "southwest" : {
                  "lat" : 40.1301580197085,
                  "lng" : -74.03034698029151
               }
            }
         },
         "place_id" : "ChIJSUENuniIwYkRm9pgGolNa2s",
         "types" : [ "street_address" ]
      },
      {
         "address_components" : [
            {
               "long_name" : "美国",
               "short_name" : "US",
               "types" : [ "country", "political" ]
            }
         ],
         "formatted_address" : "美国",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : 71.3867745,
                  "lng" : -66.9502861
               },
               "southwest" : {
                  "lat" : 18.9106768,
                  "lng" : 172.4458955
               }
            },
            "location" : {
               "lat" : 37.09024,
               "lng" : -95.712891
            },
            "location_type" : "APPROXIMATE",
            "viewport" : {
               "northeast" : {
                  "lat" : 49.38,
                  "lng" : -66.94
               },
               "southwest" : {
                  "lat" : 25.82,
                  "lng" : -124.39
               }
            }
         },
         "place_id" : "ChIJCzYy5IS16lQRQrfeQ5K5Oxw",
         "types" : [ "country", "political" ]
      }
   ],
   "status" : "OK"
}

<GeocodeResponse>
    <status>OK</status>
    <result>
        <type>street_address</type>
        <formatted_address>511 Ocean Ave, Sea Girt, NJ 08750美国</formatted_address>
        <address_component>
            <long_name>511</long_name>
            <short_name>511</short_name>
            <type>street_number</type>
        </address_component>
        <address_component>
            <long_name>Ocean Avenue</long_name>
            <short_name>Ocean Ave</short_name>
            <type>route</type>
        </address_component>
        <address_component>
            <long_name>Sea Girt</long_name>
            <short_name>Sea Girt</short_name>
            <type>locality</type>
            <type>political</type>
        </address_component>
        <address_component>
            <long_name>Monmouth County</long_name>
            <short_name>Monmouth County</short_name>
            <type>administrative_area_level_2</type>
            <type>political</type>
        </address_component>
        <address_component>
            <long_name>New Jersey</long_name>
            <short_name>NJ</short_name>
            <type>administrative_area_level_1</type>
            <type>political</type>
        </address_component>
        <address_component>
            <long_name>美国</long_name>
            <short_name>US</short_name>
            <type>country</type>
            <type>political</type>
        </address_component>
        <address_component>
            <long_name>08750</long_name>
            <short_name>08750</short_name>
            <type>postal_code</type>
        </address_component>
        <address_component>
            <long_name>2712</long_name>
            <short_name>2712</short_name>
            <type>postal_code_suffix</type>
        </address_component>
        <geometry>
            <location>
                <lat>40.1315070</lat>
                <lng>-74.0289980</lng>
            </location>
            <location_type>ROOFTOP</location_type>
            <viewport>
                <southwest>
                    <lat>40.1301580</lat>
                    <lng>-74.0303470</lng>
                </southwest>
                <northeast>
                    <lat>40.1328560</lat>
                    <lng>-74.0276490</lng>
                </northeast>
            </viewport>
        </geometry>
        <place_id>ChIJSUENuniIwYkRm9pgGolNa2s</place_id>
    </result>
    <result>
        <type>country</type>
        <type>political</type>
        <formatted_address>美国</formatted_address>
        <address_component>
            <long_name>美国</long_name>
            <short_name>US</short_name>
            <type>country</type>
            <type>political</type>
        </address_component>
        <geometry>
            <location>
                <lat>37.0902400</lat>
                <lng>-95.7128910</lng>
            </location>
            <location_type>APPROXIMATE</location_type>
            <viewport>
                <southwest>
                    <lat>25.8200000</lat>
                    <lng>-124.3900000</lng>
                </southwest>
                <northeast>
                    <lat>49.3800000</lat>
                    <lng>-66.9400000</lng>
                </northeast>
            </viewport>
            <bounds>
                <southwest>
                    <lat>18.9106768</lat>
                    <lng>172.4458955</lng>
                </southwest>
                <northeast>
                    <lat>71.3867745</lat>
                    <lng>-66.9502861</lng>
                </northeast>
            </bounds>
        </geometry>
        <place_id>ChIJCzYy5IS16lQRQrfeQ5K5Oxw</place_id>
    </result>
</GeocodeResponse>