Rexsee API介紹：基站定位功能，Android CellLocation源碼

先提示一點，不能使用用模擬器研究Android的基站定位：基站資訊是來自電訊廠商的，模擬器只能類比網路延遲（-netdelay）、網速（-netspeed）、以及一些電話相關的操作，gsm <call|accept|busy|cancel|data|hold|list|voice|status>。還不能類比訊號。

一段基於Rexsee（ www.rexsee.com）的基本樣本demo，其中cid 和 lac 為經緯度。
01 function query(){ 

02   var loction = eval('('+rexseeCellLocation.getLastKnownLocation()+')'); 

03   var type = location.type.toLowerCase(); 

04   var mcc = parseInt(location.operator.substring(0,3)); 

05   var mnc = (type=='gsm')?parseInt(location.operator.substring(3)):location.systemId; 

06   var cid= (type=='gsm')?location.cid:location.baseStationId; 

07   var lac= (type=='gsm')?location.lac:location.networkId; 

08   var postData="{\version\":\"1.1.0\",\"host\":\maps.google.com\",\"access_token\";\"2:k7j3G6LaL6u_lafw:4iXOeOpTh1glSXe\",\"home_mobile_country_code\":"+mcc+",\"home_mobile_network_code\":"+mnc+",\"address_language\";\"zh_CN\",\"radio_type\";\""+type+"\",\"request_address\":true,\"cell_towers\":[{\"cell_id\":+cid+",\"location_area_code\":+lac+",\"mobile_aountry_code\":"+mcc+",\"mobile_network_code\":"+mnc+",\"timing_advance\":5555}]}"; 

09   

10 alert(rexseeAjax.syncSubmit('http://www.google.com/loc/json',postData,'utf-8')); 

11 }

返回的結果是：
  


 

需要注意幾個問題：
1. 如果直接用alert(rexseeCellLocation.getLastKnownLocation()); 這個方法得到的經緯度會是兩個非常大的數字 所以需要通過ajax提交到"http://www.google.com/loc/json" 把所需要的經緯度返回來；
2. 開始監聽，一旦位置發生變化，會觸發事件onCellLocationChanged。所以，要在 onCellLocationChanged中寫代碼，調用你的query函數。而不是直接使用onclick測試。

Rexsee擴充函數介紹

【函數】  boolean isEnabled()
【說明】  是否正在監聽基站定位的變化。
【返回】  true或false。
【參數】  無
【樣本】 
view sourceprint?1 alert(rexseeCellLocation.isEnabled());

【函數】  boolean enable()
【說明】  開始監聽，一旦位置發生變化，會觸發事件onCellLocationChanged。
【返回】  true或false。
【參數】  無
【樣本】 
view sourceprint?1 alert(rexseeCellLocation.enable());

【函數】  boolean disable()
【說明】  停止監聽。
【返回】  true或false。
【參數】  無
【樣本】 
view sourceprint?1 alert(rexseeCellLocation.disable());

【函數】  JsonObject getLastKnownLocation()
【說明】  讀取基站定位元據，注意，CDMA網路和GSM網路的定位元據格式是不同的。
【返回】  JSON對象，使用eval('('+json+')')轉換為JavaScript對象。
【參數】  無
【樣本】 
view sourceprint?1 alert(rexseeCellLocation.getLastKnownLocation());

 

rexseeCellLocation.java源碼如下：

001 /*  

002 * Copyright (C) 2011 The Rexsee Open Source Project  

003 *  

004 * Licensed under the Rexsee License, Version 1.0 (the "License");  

005 * you may not use this file except in compliance with the License.  

006 * You may obtain a copy of the License at  

007 *  

008 *      http://www.rexsee.com/CN/legal/license.html  

009 *  

010 * Unless required by applicable law or agreed to in writing, software  

011 * distributed under the License is distributed on an "AS IS" BASIS,  

012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  

013 * See the License for the specific language governing permissions and  

014 * limitations under the License.  

015 */ 

016    

017 package rexsee.location;   

018    

019 import rexsee.core.browser.JavascriptInterface;   

020 import rexsee.core.browser.RexseeBrowser;   

021 import android.content.Context;   

022 import android.telephony.CellLocation;   

023 import android.telephony.PhoneStateListener;   

024 import android.telephony.TelephonyManager;   

025 import android.telephony.cdma.CdmaCellLocation;   

026 import android.telephony.gsm.GsmCellLocation;   

027    

028 public class RexseeCellLocation implements JavascriptInterface {   

029    

030        private static final String INTERFACE_NAME = "CellLocation";   

031        @Override  

032        public String getInterfaceName() {   

033                return mBrowser.application.resources.prefix + INTERFACE_NAME;   

034        }   

035        @Override  

036        public JavascriptInterface getInheritInterface(RexseeBrowser childBrowser) {   

037                return this;   

038        }   

039        @Override  

040        public JavascriptInterface getNewInterface(RexseeBrowser childBrowser) {   

041                return new RexseeCellLocation(childBrowser);   

042        }   

043    

044        public static final String EVENT_ONCELLLOCATIONCHANGED = "onCellLocationChanged";   

045    

046        public final Context mContext;   

047        private final RexseeBrowser mBrowser;   

048        private final int mPhoneType;   

049        private PhoneStateListener mListener = null;   

050        private CellLocation mLocation = null;   

051    

052        public RexseeCellLocation(RexseeBrowser browser) {   

053                mContext = browser.getContext();   

054                mBrowser = browser;   

055                browser.eventList.add(EVENT_ONCELLLOCATIONCHANGED);   

056                TelephonyManager tm = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);   

057                mPhoneType = tm.getPhoneType();   

058        }   

059    

060        //JavaScript Interface   

061        public boolean isEnabled() {   

062                return mListener != null;   

063        }   

064        public boolean enable() {   

065                try {   

066                        TelephonyManager tm = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);   

067                        mListener = new PhoneStateListener() {   

068                                @Override  

069                                public void onCellLocationChanged(CellLocation location) {   

070                                        mLocation = location;   

071                                        mBrowser.eventList.run(EVENT_ONCELLLOCATIONCHANGED);   

072                                }   

073                        };   

074                        tm.listen(mListener, PhoneStateListener.LISTEN_CELL_LOCATION);   

075                        return true;   

076                } catch (Exception e) {   

077                        mBrowser.exception(getInterfaceName(), e);   

078                        return false;   

079                }   

080        }   

081        public boolean disable() {   

082                if (mListener == null) return true;   

083                try {   

084                        TelephonyManager tm = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);   

085                        tm.listen(mListener, PhoneStateListener.LISTEN_NONE);   

086                        mListener = null;   

087                        return true;   

088                } catch (Exception e) {   

089                        mBrowser.exception(getInterfaceName(), e);   

090                        return false;   

091                }   

092        }   

093        public String getLastKnownLocation() {   

094                if (mLocation == null) return "{}";   

095                TelephonyManager tm = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);   

096                String rtn = "";   

097                rtn += "\"operator\":\"" + tm.getNetworkOperator() + "\"";   

098                rtn += ",\"operatorName\":\"" + tm.getNetworkOperatorName() + "\"";   

099                if (mPhoneType == TelephonyManager.PHONE_TYPE_GSM) {   

100                        GsmCellLocation gsm = (GsmCellLocation) mLocation;   

101                        rtn += ",\"type\":\"GSM\"";   

102                        rtn += ",\"cid\":" + gsm.getCid();   

103                        rtn += ",\"lac\":" + gsm.getLac();   

104                } else if (mPhoneType == TelephonyManager.PHONE_TYPE_CDMA) {   

105                        CdmaCellLocation cdma = (CdmaCellLocation) mLocation;   

106                        rtn += ",\"type\":\"CDMA\"";   

107                        rtn += ",\"baseStationId\":" + cdma.getBaseStationId();   

108                        rtn += ",\"baseStationLatitude\":" + cdma.getBaseStationLatitude();   

109                        rtn += ",\"baseStationLongitude\":" + cdma.getBaseStationLongitude();   

110                        rtn += ",\"networkId\":" + cdma.getNetworkId();   

111                        rtn += ",\"systemId\":" + cdma.getSystemId();   

112                }   

113                return "{" + rtn + "}";   

114        }   

115    

116     }

 僅對Rexsee的源碼和函數事件做了整理，相關的demo或源碼解析可以在Rexsee社區瞭解，目前Rexsee已提供了近2000個擴充，覆蓋Android原生功能超過90%，且全部開放： http://www.rexsee.com/  

摘自  yejiang