android 获取粗略位置_在Android上获取用户当前位置的最简单，最强大的方法是什么？...
在搜索最佳實現后，如何獲得最佳的精確用戶位置，我設法結合所有最好的方法，并提出以下類：/**
*?Retrieve?accurate?location?from?GPS?or?network?services.
*
*
*?Class?usage?example:
*
*?public?void?onCreate(Bundle?savedInstanceState)?{
*??????...
*??????my_location?=?new?MyLocation();
*??????my_location.init(main.this,?locationResult);
*?}
*
*
*?public?LocationResult?locationResult?=?new?LocationResult(){
*??????@Override
*??????public?void?gotLocation(final?Location?location){
*??????????//?do?something
*??????????location.getLongitude();
*??????????location.getLatitude();
*??????}
*??};
*/class?MyLocation{
/**
*?If?GPS?is?enabled.
*?Use?minimal?connected?satellites?count.
*/
private?static?final?int?min_gps_sat_count?=?5;
/**
*?Iteration?step?time.
*/
private?static?final?int?iteration_timeout_step?=?500;
LocationResult?locationResult;
private?Location?bestLocation?=?null;
private?Handler?handler?=?new?Handler();
private?LocationManager?myLocationManager;
public?Context?context;
private?boolean?gps_enabled?=?false;
private?int?counts????=?0;
private?int?sat_count?=?0;
private?Runnable?showTime?=?new?Runnable()?{
public?void?run()?{
boolean?stop?=?false;
counts++;
System.println("counts="?+?counts);
//if?timeout?(1?min)?exceeded,?stop?tying
if(counts?>?120){
stop?=?true;
}
//update?last?best?location
bestLocation?=?getLocation(context);
//if?location?is?not?ready?or?don`t?exists,?try?again
if(bestLocation?==?null?&&?gps_enabled){
System.println("BestLocation?not?ready,?continue?to?wait");
handler.postDelayed(this,?iteration_timeout_step);
}else{
//if?best?location?is?known,?calculate?if?we?need?to?continue?to?look?for?better?location
//if?gps?is?enabled?and?min?satellites?count?has?not?been?connected?or?min?check?count?is?smaller?then?4?(2?sec)
if(stop?==?false?&&?!needToStop()){
System.println("Connected?"?+?sat_count?+?"?sattelites.?continue?waiting..");
handler.postDelayed(this,?iteration_timeout_step);
}else{
System.println("#########################################");
System.println("BestLocation?finded?return?result?to?main.?sat_count="?+?sat_count);
System.println("#########################################");
//?removing?all?updates?and?listeners
myLocationManager.removeUpdates(gpsLocationListener);
myLocationManager.removeUpdates(networkLocationListener);
myLocationManager.removeGpsStatusListener(gpsStatusListener);
sat_count?=?0;
//?send?best?location?to?locationResult
locationResult.gotLocation(bestLocation);
}
}
}
};
/**
*?Determine?if?continue?to?try?to?find?best?location
*/
private?Boolean?needToStop(){
if(!gps_enabled){
return?true;
}
else?if(counts?<=?4){
return?false;
}
if(sat_count?
//if?20-25?sec?and?3?satellites?found?then?stop
if(counts?>=?40?&&?sat_count?>=?3){
return?true;
}
return?false;
}
}
return?true;
}
/**
*?Best?location?abstract?result?class
*/
public?static?abstract?class?LocationResult{
public?abstract?void?gotLocation(Location?location);
}
/**
*?Initialize?starting?values?and?starting?best?location?listeners
*
*?@param?Context?ctx
*?@param?LocationResult?result
*/
public?void?init(Context?ctx,?LocationResult?result){
context?=?ctx;
locationResult?=?result;
myLocationManager?=?(LocationManager)?context.getSystemService(Context.LOCATION_SERVICE);
gps_enabled?=?(Boolean)?myLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
bestLocation?=?null;
counts?=?0;
//?turning?on?location?updates
myLocationManager.requestLocationUpdates("network",?0,?0,?networkLocationListener);
myLocationManager.requestLocationUpdates("gps",?0,?0,?gpsLocationListener);
myLocationManager.addGpsStatusListener(gpsStatusListener);
//?starting?best?location?finder?loop
handler.postDelayed(showTime,?iteration_timeout_step);
}
/**
*?GpsStatus?listener.?OnChainged?counts?connected?satellites?count.
*/
public?final?GpsStatus.Listener?gpsStatusListener?=?new?GpsStatus.Listener()?{
public?void?onGpsStatusChanged(int?event)?{
if(event?==?GpsStatus.GPS_EVENT_SATELLITE_STATUS){
try?{
//?Check?number?of?satellites?in?list?to?determine?fix?state
GpsStatus?status?=?myLocationManager.getGpsStatus(null);
Iterablesatellites?=?status.getSatellites();
sat_count?=?0;
IteratorsatI?=?satellites.iterator();
while(satI.hasNext())?{
GpsSatellite?satellite?=?satI.next();
System.println("Satellite:?snr="?+?satellite.getSnr()?+?",?elevation="?+?satellite.getElevation());
sat_count++;
}
}?catch?(Exception?e)?{
e.printStackTrace();
sat_count?=?min_gps_sat_count?+?1;
}
System.println("####?sat_count?=?"?+?sat_count);
}
}
};
/**
*?Gps?location?listener.
*/
public?final?LocationListener?gpsLocationListener?=?new?LocationListener(){
@Override
public?void?onLocationChanged(Location?location){
}
public?void?onProviderDisabled(String?provider){}
public?void?onProviderEnabled(String?provider){}
public?void?onStatusChanged(String?provider,?int?status,?Bundle?extras){}
};
/**
*?Network?location?listener.
*/
public?final?LocationListener?networkLocationListener?=?new?LocationListener(){
@Override
public?void?onLocationChanged(Location?location){
}
public?void?onProviderDisabled(String?provider){}
public?void?onProviderEnabled(String?provider){}
public?void?onStatusChanged(String?provider,?int?status,?Bundle?extras){}
};
/**
*?Returns?best?location?using?LocationManager.getBestProvider()
*
*?@param?context
*?@return?Location|null
*/
public?static?Location?getLocation(Context?context){
System.println("getLocation()");
//?fetch?last?known?location?and?update?it
try?{
LocationManager?lm?=?(LocationManager)?context.getSystemService(Context.LOCATION_SERVICE);
Criteria?criteria?=?new?Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
String?strLocationProvider?=?lm.getBestProvider(criteria,?true);
System.println("strLocationProvider="?+?strLocationProvider);
Location?location?=?lm.getLastKnownLocation(strLocationProvider);
if(location?!=?null){
return?location;
}
return?null;
}?catch?(Exception?e)?{
e.printStackTrace();
return?null;
}
}}
min_gps_sat_count如果啟用GPS，此課程將嘗試連接到衛星。否則返回LocationManager.getBestProvider()位置。檢查代碼！
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