Android Gps issue - android

The following code works on some devices but it does not work other devices. If I check the gps setting the gps is on and provides a mock location. My manifest file also as the following permissions:
// Getting LocationManager object
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
// Creating an empty criteria object
Criteria criteria = new Criteria();
// Getting the name of the provider that meets the criteria
provider = locationManager.getBestProvider(criteria, false);
if(provider!=null && !provider.equals("")){
// Get the location from the given provider
Location location = locationManager.getLastKnownLocation(provider);
locationManager.requestLocationUpdates(provider, 20000, 1, this);
if(location!=null)
onLocationChanged(location);
else
Toast.makeText(getBaseContext(), "Location can't be retrieved", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getBaseContext(), "No Provider Found", Toast.LENGTH_SHORT).show();
}

Related

How can I retrieve the last location in android when GPS/Mobile Data /Wifi is off

is android stores last location, if so is it possible to get the last location when GPS/Mobile Data/Wifi is off.
The last known location of the device provides a handy base from which to start, ensuring that the app has a known location before starting the periodic location updates.
check this link .its very useful to us.
http://www.androidwarriors.com/2015/10/fused-location-provider-in-android.html
You could use locationmanager
LocationManager locationManager = (LocationManager) getSystemService(getApplicationContext().LOCATION_SERVICE);
// default
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, false);//get bese location provider
if (provider != null && !provider.equals(""))
{
//check for permission
if ( ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
// Get the location from the given provider
Location location = locationManager.getLastKnownLocation(provider);
if (location != null) {
String Latitude = "" + location.getLatitude();
String Longitude = "" + location.getLongitude();
}
}
}
You need permission
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

When I switch on GPS or network provider new, my program doesn't get latitude and longitude

I have a program that gets latitude and longitude of the user.
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Create a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Get the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Get Current Location
if (ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
}
Location myLocation = locationManager.getLastKnownLocation(provider);
Location myLocation = locationManager.getLastKnownLocation(provider);
boolean netEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (netEnabled) {
if (isGPSEnabled) {
latitude = myLocation.getLatitude();
longitude = myLocation.getLongitude()
} else if (!isGPSEnabled) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
} else {
// displayPromptForEnablingGPS(MapsActivity.this);
}
}
} else if (!netEnabled) {
if (isGPSEnabled) {
latitude = myLocation.getLatitude();
// Get longitude of the current location
longitude = myLocation.getLongitude();
} else {
// displayPromptForEnablingGPS(MapsActivity.this);
}
}
(displayPromptForEnablingGPS is for ACTION_LOCATION_SOURCE_SETTINGS)
In the program, if GPS and network providers are off, a window is opened for switching on them. When i switch GPS on in the first time, it gives error in first if(GPSEnabled) method(error on latitude=myLocation.getLatitude()). I can't get latitude and longitude. It is also same when i switch on only network provider. It gives "location" variable null. But if i open Google Maps, it starts to get latitude and longitude.
What can the problem be? It is problem of phone or i must make GPS run by writing any code?
Thanks for your help.
The method will return null value in case there’s no location information previously.
It’s better to get last known location iterate over all of the enabled providers, because this is the case that
there’s no GPS and Network provider. >> link on SO
It’s just better to add handling that case
if(!netEnabled && isGPSEnabled ){
//no network provider is enabled
Above sample code : here

Android google maps use GPS location NOT network

In my application I want to get the location of the user and show it on a map (google maps).
In the settings of a android device you can check
Use Wireless networks
Use GPS satellites
When the user starts the mapactivity I show a dialog in wich the user can choose to get his current location or not.
Old code deleted
If the user wants to get his location I check if the gps is enabled. If not, I start the settings. Else I try to get the location. But even when GPS is active and "use wireless networks" not he won't get a location. Is there a solution to check if "Use wireless networks" is enabled. Or what part of my code I need to change to get location only by GPS signal?
Thanks
EDIT mycurrentcode:
boolean isGps = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean isNetwork = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(!isGps && !isNetwork){
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
} else if(isGps && !isNetwork) {
String bestProvider = LocationManager.GPS_PROVIDER;
Location location = lm.getLastKnownLocation(bestProvider);
Toast.makeText(MapsTabActivitiy.this, "Location niet beschikbaar.", Toast.LENGTH_SHORT).show();
} else if(!isGps && isNetwork) {
String bestProvider = LocationManager.NETWORK_PROVIDER;
Location location = lm.getLastKnownLocation(bestProvider);
if(location == null){
location = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
} else if (location != null){
mapcontroller.animateTo(new GeoPoint((int)(location.getLatitude()*1E6), (int)(location.getLongitude()*1E6)));
mapcontroller.setZoom(15);
}
}
else {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
String bestProvider = lm.getBestProvider(criteria, false);
Location location = lm.getLastKnownLocation(bestProvider);
if(location == null){
location = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
} else if (location != null){
mapcontroller.animateTo(new GeoPoint((int)(location.getLatitude()*1E6), (int)(location.getLongitude()*1E6)));
mapcontroller.setZoom(15);
}
}
So I check with isProviderEnabled for GPS_PROVIDER AND NETWORK_PROVIDER. And with the if, else if I change how to get the location. The only case I need to find is case 2 (else if(isGps && !isNetwork){}). Get the location by GPS signal.
You're getting the right provider using the Criteria class, but you can simple use the LocationManager.GPS_PROVIDER to request the location updates using only GPS. Change
String bestProvider = lm.getBestProvider(criteria, false);
to
String bestProvider = LocationManager.GPS_PROVIDER;
Hope this helps.

How to get current location when proximity alert fires

I am using the following code to determine the current location when a proximity alert fires:
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location == null) {
// We'll just write an empty location
location = new Location("");
}
}
When I look at the locations that I get back I get entering alerts in locations where I should't get them. I was under the impression since proximity alerts internally poll the GPS and network provider - thus updating the LastKnownLocation - that this code would yield the current location. Is this assumption correct?
I am using the following code to determine the current location and its working too. Check out dis code...
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager) getSystemService(context);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);
if (null != provider)
{
Location location = locationManager.getLastKnownLocation(provider);
if (null != location) {
GpsFound=true;
currentLat = location.getLatitude();
currentLon = location.getLongitude();
System.out.println("Current Lat,Long :"+currentLat+" ,"+currentLon);
}
else
{
//GpsFound=false;
gpsMsg="Current Location can not be resolved!";
}
}
else
{
gpsMsg="Provider is not available!";
//GpsFound=false;
}

criteria for both GPS and network

I would like to know how can I get location from the best provider
do I have to make two separate criteria 1 for the GPS and 1 for the network or is there a way to put them all together ?
this is my code when I add the COARSE criteria the GPS does not go on (no GPS flashing logo on the top of the screen) and when I use the FINE criteria I dont get any thing from the network.......so do I have to write criteria for both and switch between them for what ever is available or can they both be in the same criteria ?
because I have the "getBestProvider(criteria, true);" in my code so it should get the location from the best provider....right..??!
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
//// criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_HIGH);
String provider = locationManager.getBestProvider(criteria, true);
Using a getBestProvider with Criteria.ACCURACY_FINE will never return the NETWORK_PROVIDER, even though wifi position is usually quite accurate.
In my application, I use getProviders to get all providers matching my criteria, then add the NETWORK_PROVIDER if it is activated and not yet in the list.
Then I launch a requestLocationUpdates for each of these providers, making sure to call removeUpdates when I get a location accurate enough.
This way, if the location provided by the network is accurate enough, the gps provider will be turned off
#nicopico getBestProvider with Criteria.ACCURACY_FINE can return the NETWORK_PROVIDER if gps is not enabled
i use the following code in my app
public void getLocation() {
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(context);
// boolean network_enabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
// Showing status
if (status != ConnectionResult.SUCCESS) { // Google Play Services are not available
Log.e(TAG, "getLocation fired Google Play Services are not available");
mHandler.post(new UiToastCommunicaton(context.getApplicationContext(),
context.getResources().getString(R.string.gpserv_notfound)));
}
// Getting LocationManager object from System Service LOCATION_SERVICE
locationManager = (LocationManager) context.getSystemService(IntentService.LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {//check if network location provider context on
Log.e(TAG, "network location provider not enabled");
} else {
criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
//criteria.setPowerRequirement(Criteria.POWER_LOW);
// Getting the name of the best provider
provider = locationManager.getBestProvider(criteria, true);
// Check provider exists then request for location
if (provider != null) {
requestLocation(locationManager, provider);
} else {
//start wifi, gps, or tell user to do so
}
}
}
public void requestLocation(LocationManager locationManager, String provider) {
Log.e(TAG, "requestLocation fired getting location now");
if (provider != null) {
locationManager.requestLocationUpdates(provider, 0, 0, this);
//locationManager.requestLocationUpdates(provider, 0, 0, this, Looper.getMainLooper());
} else {
//tell user what has happened
}
}
this code is in a class that implements locationListener
you can edit this line
locationManager.requestLocationUpdates(provider, 0, 0, this);
to reflect your implementation of locationListener

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