android 使用基站 wifi定位

转自：http://fengzhizi715.iteye.com/blog/825716

android可以借助于gps实现定位，但是很多地方是使用gps无法定位比如在室内，而且gps定位的话速度慢。

那么如何克服这样的缺点使得应用程序在室内也可以定位呢？办法是有的借助于基站和wifi进行定位。具体的细节可参考：
http://code.google.com/intl/zh-CN/apis/gears/geolocation_network_protocol.html

下面的代码实现了定位的大致功能
CellIDInfo.java 封装了cellid的信息

public class CellIDInfo { public int cellId; public String mobileCountryCode; public String mobileNetworkCode; public int locationAreaCode; public String radioType; public CellIDInfo(){} }

WifiInfo.java 封装了wifi的信息

public class WifiInfo { public String mac; public WifiInfo(){} }

CellIDInfoManager.java 可获取所有的CellIDInfo

import java.util.ArrayList; import java.util.List; import android.content.Context; import android.telephony.NeighboringCellInfo; import android.telephony.PhoneStateListener; import android.telephony.TelephonyManager; import android.telephony.cdma.CdmaCellLocation; import android.telephony.gsm.GsmCellLocation; public class CellIDInfoManager { private TelephonyManager manager; private PhoneStateListener listener; private GsmCellLocation gsm; private CdmaCellLocation cdma; int lac; String current_ci,mcc, mnc; public CellIDInfoManager(){} public ArrayList<CellIDInfo> getCellIDInfo(Context context){ manager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); listener = new PhoneStateListener(); manager.listen(listener, 0); ArrayList<CellIDInfo> CellID = new ArrayList<CellIDInfo>(); CellIDInfo currentCell = new CellIDInfo(); int type = manager.getNetworkType(); if (type == TelephonyManager.NETWORK_TYPE_GPRS || type ==TelephonyManager.NETWORK_TYPE_EDGE || type ==TelephonyManager.NETWORK_TYPE_HSDPA) { gsm = ((GsmCellLocation) manager.getCellLocation()); if (gsm == null) return null; lac = gsm.getLac(); mcc = manager.getNetworkOperator().substring(0, 3); mnc = manager.getNetworkOperator().substring(3, 5); currentCell.cellId = gsm.getCid(); currentCell.mobileCountryCode = mcc; currentCell.mobileNetworkCode = mnc; currentCell.locationAreaCode = lac; currentCell.radioType = "gsm"; CellID.add(currentCell); List<NeighboringCellInfo> list = manager.getNeighboringCellInfo(); int size = list.size(); for (int i = 0; i < size; i++) { CellIDInfo info = new CellIDInfo(); info.cellId = list.get(i).getCid(); info.mobileCountryCode = mcc; info.mobileCountryCode = mnc; info.locationAreaCode = lac; CellID.add(info); } return CellID; } else if (type == TelephonyManager.NETWORK_TYPE_CDMA || type ==TelephonyManager.NETWORK_TYPE_1xRTT) { cdma = ((CdmaCellLocation) manager.getCellLocation()); if (cdma == null) return null; if ("460".equals(manager.getSimOperator().substring(0, 3))) return null; } return null; } }

WifiInfoManager.java 可获取wifi的信息，目前我只取了当前连接的wifi，没有获取所有能扫描到的wifi信息。

import java.util.ArrayList; import android.content.Context; import android.net.wifi.WifiManager; public class WifiInfoManager { WifiManager wm; public WifiInfoManager(){} public ArrayList getWifiInfo(Context context){ ArrayList<WifiInfo> wifi = new ArrayList(); wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); WifiInfo info = new WifiInfo(); info.mac = wm.getConnectionInfo().getBSSID(); wifi.add(info); return wifi; } }

调用google gears的方法，该方法调用gears来获取经纬度

private Location callGear(ArrayList<WifiInfo> wifi, ArrayList<CellIDInfo> cellID) { if (cellID == null) return null; DefaultHttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost( "http://www.google.com/loc/json"); JSONObject holder = new JSONObject(); try { holder.put("version", "1.1.0"); holder.put("host", "maps.google.com"); holder.put("home_mobile_country_code", cellID.get(0).mobileCountryCode); holder.put("home_mobile_network_code", cellID.get(0).mobileNetworkCode); holder.put("radio_type", cellID.get(0).radioType); holder.put("request_address", true); if ("460".equals(cellID.get(0).mobileCountryCode)) holder.put("address_language", "zh_CN"); else holder.put("address_language", "en_US"); JSONObject data,current_data; JSONArray array = new JSONArray(); current_data = new JSONObject(); current_data.put("cell_id", cellID.get(0).cellId); current_data.put("mobile_country_code", cellID.get(0).mobileCountryCode); current_data.put("mobile_network_code", cellID.get(0).mobileNetworkCode); current_data.put("age", 0); array.put(current_data); if (cellID.size() > 2) { for (int i = 1; i < cellID.size(); i++) { data = new JSONObject(); data.put("cell_id", cellID.get(i).cellId); data.put("location_area_code", cellID.get(0).locationAreaCode); data.put("mobile_country_code", cellID.get(0).mobileCountryCode); data.put("mobile_network_code", cellID.get(0).mobileNetworkCode); data.put("age", 0); array.put(data); } } holder.put("cell_towers", array); if (wifi.get(0).mac != null) { data = new JSONObject(); data.put("mac_address", wifi.get(0).mac); data.put("signal_strength", 8); data.put("age", 0); array = new JSONArray(); array.put(data); holder.put("wifi_towers", array); } StringEntity se = new StringEntity(holder.toString()); Log.e("Location send", holder.toString()); post.setEntity(se); HttpResponse resp = client.execute(post); HttpEntity entity = resp.getEntity(); BufferedReader br = new BufferedReader( new InputStreamReader(entity.getContent())); StringBuffer sb = new StringBuffer(); String result = br.readLine(); while (result != null) { Log.e("Locaiton reseive", result); sb.append(result); result = br.readLine(); } data = new JSONObject(sb.toString()); data = (JSONObject) data.get("location"); Location loc = new Location(LocationManager.NETWORK_PROVIDER); loc.setLatitude((Double) data.get("latitude")); loc.setLongitude((Double) data.get("longitude")); loc.setAccuracy(Float.parseFloat(data.get("accuracy").toString())); loc.setTime(AppUtil.getUTCTime()); return loc; } catch (JSONException e) { return null; } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; }

目前已经测试过中国移动、联通的卡，以及测试过中兴的MIC，都可以准确定位。
不支持的是cdma，将cdma的数据传入到gears后返回的经纬度显示是在美国。

提外话，将gps和基站、wifi三者定位结合的话效果更好。基站的定位没有wifi准确，gps的定位速度比基站、wifi都来得更慢。

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