Android 定位

先從GPS模塊獲取，再從wifi/gprs模塊中獲取，最終從蜂窩網中獲取設備位置。

[java]
package com.example.h3c.util; 
 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.UnsupportedEncodingException; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 
 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.entity.StringEntity; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import org.json.JSONTokener; 
 
import android.content.Context; 
import android.location.Location; 
import android.location.LocationManager; 
import android.telephony.TelephonyManager; 
import android.telephony.gsm.GsmCellLocation; 
 
import com.example.pickride.PickrideApplication; 
 
public class LocationTools { 
    public static String getLocation() { 
        return getDeviceAddressbyGeoPoint(); 
    } 
 
    /**
     * 獲取地址
     * 
     * @return
     */ 
    private static String getDeviceAddressbyGeoPoint() { 
        // 自經緯度取得地址  
        LocationManager locationManager = (LocationManager) PickrideApplication 
                .getAppContext().getSystemService(Context.LOCATION_SERVICE); 
        Location location = locationManager 
                .getLastKnownLocation(LocationManager.GPS_PROVIDER); 
 
        if (location == null) { 
            location = locationManager 
                    .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);// 如果gps取不到就取網絡的  
        } 
 
        // Log.d("H3c",  
        // "k:" + location.getLatitude() + "-" + location.getLongitude());  
 
        if (location == null) { 
            String locaStr = getLocationByGSMCell();// 如果wifi網絡無法獲取就獲取基站的  
            if (locaStr != null) { 
                return locaStr; 
            } 
        } 
 
        if (location == null) { 
            return "";// 無法獲取該位置  
        } 
 
        String add = GetAddr(String.valueOf(location.getLatitude()), 
                String.valueOf(location.getLongitude())); 
 
        if (add != null) { 
            return add; 
        } 
 
        return location.getLatitude() + "-" + location.getLongitude(); 
    } 
 
    /**
     * 根據經緯度反向解析地址，有時需要多嘗試幾次
     * 注意:(摘自：http://code.google.com/intl/zh-CN/apis/maps/faq.html
     * 提交的地址解析請求次數是否有限制？) 如果在 24 小時時段內收到來自一個 IP 地址超過 2500 個地址解析請求， 或從一個 IP
     * 地址提交的地址解析請求速率過快，Google 地圖 API 編碼器將用 620 狀態代碼開始響應。 如果地址解析器的使用仍然過多，則從該 IP
     * 地址對 Google 地圖 API 地址解析器的訪問可能被永久阻止。
     * 
     * @param latitude
     *            緯度
     * @param longitude
     *            經度
     * @return
     */ 
    private static String GetAddr(String latitude, String longitude) { 
        String addr = ""; 
        // 也可以是http://maps.google.cn/maps/geo?output=csv&key=abcdef&q=%s,%s，不過解析出來的是英文地址  
        // 密鑰可以隨便寫一個key=abc  
        // output=csv,也可以是xml或json，不過使用csv返回的數據最簡潔方便解析  
        String url = String.format( 
                "http://ditu.google.cn/maps/geo?output=csv&key=abcdef&q=%s,%s", 
                latitude, longitude); 
        URL myURL = null; 
        URLConnection httpsConn = null; 
        try { 
            myURL = new URL(url); 
        } catch (MalformedURLException e) { 
            e.printStackTrace(); 
            return null; 
        } 
 
        try { 
            httpsConn = (URLConnection) myURL.openConnection(); 
            if (httpsConn != null) { 
                InputStreamReader insr = new InputStreamReader( 
                        httpsConn.getInputStream(), "UTF-8"); 
                BufferedReader br = new BufferedReader(insr); 
                String data = null; 
                if ((data = br.readLine()) != null) { 
                    String[] retList = data.split(","); 
                    if (retList.length > 2 && ("200".equals(retList[0]))) { 
                        addr = retList[2]; 
                        addr = addr.replace("\"", ""); 
                        addr = addr.split(" ")[0];// 只獲得地址，否則是地址+郵編  
                    } else { 
                        addr = ""; 
                    } 
                } 
                insr.close(); 
            } 
        } catch (IOException e) { 
            e.printStackTrace(); 
            return null; 
        } 
        return addr; 
    } 
 
    private static String getLocationByGSMCell() { 
        TelephonyManager tm = (TelephonyManager) PickrideApplication 
                .getAppContext().getSystemService(Context.TELEPHONY_SERVICE); 
        GsmCellLocation gsmCell = (GsmCellLocation) tm.getCellLocation(); 
        int cid = gsmCell.getCid(); 
        int lac = gsmCell.getLac(); 
        String netOperator = tm.getNetworkOperator(); 
        int mcc = Integer.valueOf(netOperator.substring(0, 3)); 
        int mnc = Integer.valueOf(netOperator.substring(3, 5)); 
        JSONObject holder = new JSONObject(); 
        JSONArray array = new JSONArray(); 
        JSONObject data = new JSONObject(); 
        try { 
            holder.put("version", "1.1.0"); 
            holder.put("host", "maps.google.com"); 
            holder.put("address_language", "zh_CN"); 
            holder.put("request_address", true); 
            holder.put("radio_type", "gsm"); 
            holder.put("carrier", "HTC"); 
            data.put("cell_id", cid); 
            data.put("location_area_code", lac); 
            data.put("mobile_countyr_code", mcc); 
            data.put("mobile_network_code", mnc); 
            array.put(data); 
            holder.put("cell_towers", array); 
        } catch (JSONException e) { 
            e.printStackTrace(); 
        } 
        DefaultHttpClient client = new DefaultHttpClient(); 
        HttpPost httpPost = new HttpPost("http://www.google.com/loc/json"); 
        StringEntity stringEntity = null; 
        try { 
            stringEntity = new StringEntity(holder.toString()); 
        } catch (UnsupportedEncodingException e) { 
            e.printStackTrace(); 
        } 
        httpPost.setEntity(stringEntity); 
        HttpResponse httpResponse = null; 
        try { 
            httpResponse = client.execute(httpPost); 
        } catch (ClientProtocolException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
        HttpEntity httpEntity = httpResponse.getEntity(); 
        InputStream is = null; 
        try { 
            is = httpEntity.getContent(); 
        } catch (IllegalStateException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
        InputStreamReader isr = new InputStreamReader(is); 
        BufferedReader reader = new BufferedReader(isr); 
        StringBuffer stringBuffer = new StringBuffer(); 
        try { 
            String result = ""; 
            while ((result = reader.readLine()) != null) { 
                stringBuffer.append(result); 
            } 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
        String location = stringBuffer.toString(); 
        try { 
            JSONTokener jsonParser = new JSONTokener(location); 
            JSONObject person = (JSONObject) jsonParser.nextValue(); 
            JSONObject oj1 = person.getJSONObject("location"); 
            JSONObject oj2 = oj1.getJSONObject("address"); 
            String region = oj2.getString("region"); 
            String city = oj2.getString("city"); 
            String street = oj2.getString("street"); 
            return region + city + street; 
        } catch (JSONException e) { 
            e.printStackTrace(); 
        } 
        return null; 
    } 
} 

package com.example.h3c.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
import android.telephony.TelephonyManager;
import android.telephony.gsm.GsmCellLocation;

import com.example.pickride.PickrideApplication;

public class LocationTools {
    public static String getLocation() {
        return getDeviceAddressbyGeoPoint();
    }

    /**
     * 獲取地址
     *
     * @return
     */
    private static String getDeviceAddressbyGeoPoint() {
        // 自經緯度取得地址
        LocationManager locationManager = (LocationManager) PickrideApplication
                .getAppContext().getSystemService(Context.LOCATION_SERVICE);
        Location location = locationManager
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);

        if (location == null) {
            location = locationManager
                    .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);// 如果gps取不到就取網絡的
        }

        // Log.d("H3c",
        // "k:" + location.getLatitude() + "-" + location.getLongitude());

        if (location == null) {
            String locaStr = getLocationByGSMCell();// 如果wifi網絡無法獲取就獲取基站的
            if (locaStr != null) {
                return locaStr;
            }
        }

        if (location == null) {
            return "";// 無法獲取該位置
        }

        String add = GetAddr(String.valueOf(location.getLatitude()),
                String.valueOf(location.getLongitude()));

        if (add != null) {
            return add;
        }

        return location.getLatitude() + "-" + location.getLongitude();
    }

    /**
     * 根據經緯度反向解析地址，有時需要多嘗試幾次
     * 注意:(摘自：http://code.google.com/intl/zh-CN/apis/maps/faq.html
     * 提交的地址解析請求次數是否有限制？) 如果在 24 小時時段內收到來自一個 IP 地址超過 2500 個地址解析請求， 或從一個 IP
     * 地址提交的地址解析請求速率過快，Google 地圖 API 編碼器將用 620 狀態代碼開始響應。 如果地址解析器的使用仍然過多，則從該 IP
     * 地址對 Google 地圖 API 地址解析器的訪問可能被永久阻止。
     *
     * @param latitude
     *            緯度
     * @param longitude
     *            經度
     * @return
     */
    private static String GetAddr(String latitude, String longitude) {
        String addr = "";
        // 也可以是http://maps.google.cn/maps/geo?output=csv&key=abcdef&q=%s,%s，不過解析出來的是英文地址
        // 密鑰可以隨便寫一個key=abc
        // output=csv,也可以是xml或json，不過使用csv返回的數據最簡潔方便解析
        String url = String.format(
                "http://ditu.google.cn/maps/geo?output=csv&key=abcdef&q=%s,%s",
                latitude, longitude);
        URL myURL = null;
        URLConnection httpsConn = null;
        try {
            myURL = new URL(url);
        } catch (MalformedURLException e) {
            e.printStackTrace();
            return null;
        }

        try {
            httpsConn = (URLConnection) myURL.openConnection();
            if (httpsConn != null) {
                InputStreamReader insr = new InputStreamReader(
                        httpsConn.getInputStream(), "UTF-8");
                BufferedReader br = new BufferedReader(insr);
                String data = null;
                if ((data = br.readLine()) != null) {
                    String[] retList = data.split(",");
                    if (retList.length > 2 && ("200".equals(retList[0]))) {
                        addr = retList[2];
                        addr = addr.replace("\"", "");
                        addr = addr.split(" ")[0];// 只獲得地址，否則是地址+郵編
                    } else {
                        addr = "";
                    }
                }
                insr.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        return addr;
    }

    private static String getLocationByGSMCell() {
        TelephonyManager tm = (TelephonyManager) PickrideApplication
                .getAppContext().getSystemService(Context.TELEPHONY_SERVICE);
        GsmCellLocation gsmCell = (GsmCellLocation) tm.getCellLocation();
        int cid = gsmCell.getCid();
        int lac = gsmCell.getLac();
        String netOperator = tm.getNetworkOperator();
        int mcc = Integer.valueOf(netOperator.substring(0, 3));
        int mnc = Integer.valueOf(netOperator.substring(3, 5));
        JSONObject holder = new JSONObject();
        JSONArray array = new JSONArray();
        JSONObject data = new JSONObject();
        try {
            holder.put("version", "1.1.0");
            holder.put("host", "maps.google.com");
            holder.put("address_language", "zh_CN");
            holder.put("request_address", true);
            holder.put("radio_type", "gsm");
            holder.put("carrier", "HTC");
            data.put("cell_id", cid);
            data.put("location_area_code", lac);
            data.put("mobile_countyr_code", mcc);
            data.put("mobile_network_code", mnc);
            array.put(data);
            holder.put("cell_towers", array);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        DefaultHttpClient client = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost("http://www.google.com/loc/json");
        StringEntity stringEntity = null;
        try {
            stringEntity = new StringEntity(holder.toString());
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        httpPost.setEntity(stringEntity);
        HttpResponse httpResponse = null;
        try {
            httpResponse = client.execute(httpPost);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        HttpEntity httpEntity = httpResponse.getEntity();
        InputStream is = null;
        try {
            is = httpEntity.getContent();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader reader = new BufferedReader(isr);
        StringBuffer stringBuffer = new StringBuffer();
        try {
            String result = "";
            while ((result = reader.readLine()) != null) {
                stringBuffer.append(result);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        String location = stringBuffer.toString();
        try {
            JSONTokener jsonParser = new JSONTokener(location);
            JSONObject person = (JSONObject) jsonParser.nextValue();
            JSONObject oj1 = person.getJSONObject("location");
            JSONObject oj2 = oj1.getJSONObject("address");
            String region = oj2.getString("region");
            String city = oj2.getString("city");
            String street = oj2.getString("street");
            return region + city + street;
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }
}