Android定位系統(tǒng)

1、Android定位系統(tǒng)定位方式1.GPS精度高，耗電大，室外使用，搜星長。2.WIFI手機定位軟件通過偵測WiFi的ID(路由器地址)，然后在其WiFi位置數(shù)據(jù)庫和地圖數(shù)據(jù)的配合下完成定位。3.基站基于蜂窩通信技術(shù)，現(xiàn)在公安采取定位方式是基站定位，因為基站定位還是比較準確方便。4.AGPS使用基站信息對獲取GPS進行輔助。輔助GPS定位實際就是基站定位 + 遠端星歷數(shù)據(jù) + GPRS傳輸 + 集成GPS定位。GPS簡介可息?？上?。GPS定位組成GPS定位技術(shù)是利用高空中的GPS衛(wèi)星，向地面發(fā)射L波段的載頻無線電測距信號，由地面上用戶接收機實時地連續(xù)接收，并計算出接收機天線所在的位置。因此，GP

2、S定位系統(tǒng)是由以下三個部分組成：（1）GPS衛(wèi)星星座（空間部分）（2）地面監(jiān)控系統(tǒng)（地面控制部分）（3）GPS信號接收機（用戶設(shè)備部分）。GPS定位原理232323232222222221212121)()()()()()()()()(zzyyxxdzzyyxxdzzyyyxdd1d2d3P1P2P3空間距離交會法定位提供給app的API定位服務(wù)提供給應(yīng)用層的 API 位于 android.location 包中，它包含的主要類和接口如下應(yīng)用示例Override protected void onCreate(Bundle savedInstanceState) . locationManag

3、er = (LocationManager)getSystemService(LOCATION_SERVICE); Override protected void onResume() super.onResume(); String currentProvider = LocationManager.NETWORK_PROVIDER; Location lastKnownLocation = locationManager.getLastKnownLocation(currentProvider); locationManager.requestLocationUpdates(current

4、Provider, 0, 0, locationListener); Override protected void onPause() super.onPause(); locationManager.removeUpdates(locationListener); 應(yīng)用示例protected final LocationListener locationListener = new LocationListener() public void onLocationChanged(Location location) Log.d(TAG, Location changed to: + get

5、LocationInfo(location); public void onProviderDisabled(String provider) Log.d(TAG, provider + disabled.); public void onProviderEnabled(String provider) Log.d(TAG, provider + enabled.); public void onStatusChanged(String provider, int status, Bundle extras) Log.d(TAG, provider + status changed.); ;整

6、體架構(gòu)LocationManagerService public LocationManagerService(Context context) super(); mContext = context; Resources resources = context.getResources(); mNetworkLocationProviderPackageName1 = resources.getString( ernal.R.string.config_networkLocationProvider1); mNetworkLocationProviderPack

7、ageName2 = resources.getString( ernal.R.string.config_networkLocationProvider2); mGeocodeProviderPackageName = resources.getString( ernal.R.string.config_geocodeProvider); mGeoFencerPackageName = resources.getString( ernal.R.string.config_geofenceProvider

8、); mPackageMonitor.register(context, null, true); if (LOCAL_LOGV) Slog.v(TAG, Constructed LocationManager Service); LocationProviderInterface實現(xiàn)類_loadProvidersLocked()方法 / Attempt to load real providers first if (GpsLocationProvider.isSupported() / Create a gps location provider GpsLocationProvider g

9、psProvider = new GpsLocationProvider(mContext, this); mGpsStatusProvider = gpsProvider.getGpsStatusProvider(); mNetInitiatedListener = gpsProvider.getNetInitiatedListener(); addProvider(gpsProvider); mGpsLocationProvider = gpsProvider; /Create a hybrid location provider if Location HAL has that capa

10、bility HybridLocationProvider hybridProvider = gpsProvider.getHybridProvider(); if(hybridProvider != null) addProvider(hybridProvider); mHybridLocationProvider = hybridProvider; GpsLocationProvider public void run() Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); initialize(); Looper.prepare(); mHandler = new ProviderHandler(); / signal when we are initializ