Analysis of three Android mobile phone location technologies

 
//  The statement LocationManager object  
LocationManager loctionManager; 
//  Through the system service, get LocationManager object  
loctionManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 

Method 1:

 
//  through GPS The position provider gets the position  
String providerGPS = LocationManager.GPS_PROVIDER; 
Location location = loctionManager.getLastKnownLocation(providerGPS); 

Method 2:

 
//  The location is obtained through the base station location provider  
String providerNetwork = LocationManager.NETWORK_PROVIDER; 
Location location = loctionManager.getLastKnownLocation(providerNetwork); 

Method 3:

 
//  Use the standard set to let the system automatically select the best available location provider to provide the location  
Criteria criteria = new Criteria(); 
criteria.setAccuracy(Criteria.ACCURACY_FINE);//  High precision  
criteria.setAltitudeRequired(false);//  No altitude required  
criteria.setBearingRequired(false);//  No bearing requirement  
criteria.setCostAllowed(true);//  Allowable cost  
criteria.setPowerRequirement(Criteria.POWER_LOW);//  Low power consumption  
//  The best provider that matches the above criteria from the available location providers  
String provider = loctionManager.getBestProvider(criteria, true); 
//  To obtain the final 1 The secondary position  
Location location = loctionManager.getLastKnownLocation(provider); 

Processing:

 
//  Displayed in the EditText In the  
updateWithNewLocation(location); 
//  Listen for changes in position, 2 seconds 1 Time, distance 10 Meters above  
loctionManager.requestLocationUpdates(provider, 1000, 1, locationListener); 

Monitor and display:

 
//  Position monitor  
private final LocationListener locationListener = new LocationListener() { 
@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 
} 
@Override 
public void onProviderEnabled(String provider) { 
} 
@Override 
public void onProviderDisabled(String provider) { 
} 
//  Triggered when position changes  
@Override 
public void onLocationChanged(Location location) { 
//  Using the new location update TextView According to  
updateWithNewLocation(location); 
} 
}; 
private void updateWithNewLocation(Location location) { 
if (location != null) { 
double lat = location.getLatitude(); 
double lng = location.getLongitude(); 
latStr = format.format(lat); 
lonStr = format.format(lng); 
txtLat.setText(latStr); 
txtLon.setText(lonStr); 
} else { 
txtLat.setText(""); 
txtLon.setText(""); 
} 
}