android JAVA 层API GPS 研究总结

mgr=(LocationManager)getSystemService(LOCATION_SERVICE);    mgr.addGpsStatusListener(listener);    Criteria criteria= new Criteria();    best=mgr.getBestProvider(criteria, true);    Location location= mgr.getLastKnownLocation("gps");

以上代码创建了一个位置对象

if(location.hasAccuracy()) accuracy=location.getAccuracy();//获取精度    if(location.hasAltitude()) altitude=location.getAltitude();//高度    if(location.hasBearing()) bearing=location.getBearing();    if(location.hasSpeed()) speed=location.getSpeed();latitude=location.getLatitude();longtitude=location.getLongitude();    time=location.getTime();//此时time是一个long型代表从1970年01月01日00:00:00至GPS取得位置信息的时间的毫秒数。//要转换成日期字符串格式，使用以下代码： SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd/HH/mm/ss/"); Log.d(tag,  "bb*1000,,"+sdf.format(new Date(time*1000L ))+"BB");  //如果time代表的是秒数要乘1000Log.d(tag,  "bb no*1000,,"+sdf.format(new Date(time ))+"BB");  //如果time代表毫秒数就不用乘1000了

注意要在AndroidManifest.xml文件中加入权限。如下：
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>

listener = new GpsStatus.Listener() {            public void onGpsStatusChanged(int event) {            gpsstatus=mgr.getGpsStatus(null);            switch(event)            {            case GpsStatus.GPS_EVENT_FIRST_FIX:gpsstatus.getTimeToFirstFix();              case GpsStatus.GPS_EVENT_SATELLITE_STATUS:                   //得到所有收到的卫星的信息，包括 卫星的高度角、方位角、信噪比、和伪随机号（及卫星编号）            Log.d(tag, "get 卫星信息");            Iterable<GpsSatellite> allSatellites;            allSatellites = gpsstatus.getSatellites();            Iterator it=allSatellites.iterator();            String msg="";            while(it.hasNext())            {            GpsSatellite oSat = (GpsSatellite) it.next() ;              msg="\n*************\nazimuth:"+oSat.getAzimuth();            msg+="\nprn:"+oSat.getPrn();            msg+="\nsnr:"+oSat.getSnr()+"\n********\n";            }            Log.i(tag,msg);            break;                       case GpsStatus.GPS_EVENT_STARTED:                   //Event sent when the GPS system has started.           break;                       case GpsStatus.GPS_EVENT_STOPPED:                  //Event sent when the GPS system has stopped.             break;                       default :            break;            }                            }     };

记得在eclipse中，使用ctrl+shift+o以导入需要的包。

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