通过Cell-ID获取位置信息
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| − | [[Category:Lang-Chinese]][[Category:Series 40]][[Category:Java ME]] | + | {{ArticleMetaData |
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| + | |platform= <!-- Compatible platforms - e.g. Symbian^1 and later, Qt 4.6 and later --> | ||
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== C2系列手机介绍 == | == C2系列手机介绍 == | ||
2011年6月21日，第11届诺基亚年度盛会NokiaConnection在新加坡著名地标滨海湾金沙酒店（MarinaBay）开幕。会上诺基亚执行副总裁Mary McDowell发布三款C2系列新机C2-02、C2-03与C2-06。 | 2011年6月21日，第11届诺基亚年度盛会NokiaConnection在新加坡著名地标滨海湾金沙酒店（MarinaBay）开幕。会上诺基亚执行副总裁Mary McDowell发布三款C2系列新机C2-02、C2-03与C2-06。 | ||
Revision as of 06:44, 10 November 2011
文章信息
Contents |
C2系列手机介绍
2011年6月21日，第11届诺基亚年度盛会NokiaConnection在新加坡著名地标滨海湾金沙酒店（MarinaBay）开幕。会上诺基亚执行副总裁Mary McDowell发布三款C2系列新机C2-02、C2-03与C2-06。
“这三款手机都能够为消费者带来市场上一流的上网、地图和信息体验，还同时提供触摸屏和键盘两种选择，让操作界面变得更加简便易上手。用户还可以选择双卡或单卡版本，让这三款手机在同类产品中极具竞争力。”MaryMcDowell表示。
本次C2系列的产品组合包括双卡手机与单卡手机，触键双控，能够为S40用户带来全新的、先进的互联网与地图体验。三款手机均配有针对S40系列的全新诺基亚地图，预装当地地图和兴趣点。用户可以在离线的情况下浏览地图并规划路线，从而省去通过网络下载地图的成本。
诺基亚C2-02
JSR179 Location API
JavaME 规范中定义了JSR179 Location API。这个包中涵盖了大量的用于获取位置信息的类。在此基础上，诺基亚又增加了Location API Appendix作为对JSR179的扩展。这个包只包含了一个类：
com.nokia.mid.location.LocationUtil
LocationUtil类也只定义了一个静态方法：
static LocationProvider
getLocationProvider(int[] preferredMethods, java.lang.String parameters)
目前，参数preferredMethods的取值只有下面4组，而对于C2系列手机只能通过Cell-Id取得位置，所以也只能去第一组值。其他三组都不适用于C2系列手机。
- (MTA_ASSISTED | MTE_CELLID | MTE_SHORTRANGE | MTY_NETWORKBASED) - Online CellID and/or WLAN
- (MTA_ASSISTED | MTE_SATELLTITE | MTY_TERMINALBASED) - Assisted GPS
- (MTA_UNASSISTED | MTE_SATELLITE | MTY_TERMINALBASED) - Standalone GPS
- (MTA_UNASSISTED | MTE_CELLID | MTY_TERMINALBASED) - Offline CellID
第二个参数parameters是为了以后扩展之用，目前取值只能是null。
以下代码演示了如何利用LocationUtil和JSR179 Location API获取经纬度的信息：
try {
//MTA_ASSISTED Location method is assisted by the other party
//MTE_CELLID Location method Cell-ID for cellular
//MTY_NETWORKBASED Location method is of type network based.
int[] methods = {(Location.MTA_ASSISTED | Location.MTE_CELLID | Location.MTY_NETWORKBASED)}; // works
LocationProvider lp = LocationUtil.getLocationProvider(methods, null);
Location loc = lp.getLocation(-1);
Coordinates coords = loc.getQualifiedCoordinates();
lat = coords.getLatitude(); //double
lng = coords.getLongitude();//double
}
catch (Exception e) {
e.printStackTrace();
}
代码运行结果如下图所示：
源代码
File:CellID com.nokia.mid.location.LocationUtil.zip
