I am working on getting current location through GPS. But GPS is always giving me last saved location!
May be it is because of this line! I am looking for better solution!
locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Here is Sample Code
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
Thanks in Advance!
If you use
locationManager .getLastKnownLocation(LocationManager.GPS_PROVIDER);
it will only return the last location saved by the GPS internally.
as you have already added a listner you can get the next changed location on the onLocationChanged overrided function which will be the closest location you need.
There is no way rather than this you need to wait till the onLocationChanged function to be triggered automatically...
Easy implementation is for you that you need to take an location listener
Don't forget to add the permission
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
You can get the frequent update of location change in below listener.
private final LocationListener mLocationListener = new LocationListener() {
#Override
public void onLocationChanged(final Location location) {
//your code here
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
};
you have to registered it in on create
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LOCATION_REFRESH_TIME,
LOCATION_REFRESH_DISTANCE, mLocationListener);
//first time you can take the value from the lastKnown location
if (locationManager != null) {
Location=locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
Related
I want to get last location (With any way) without enabling location services on device , is this possible?
How should i do this?
there are three ways to find your location,refer this
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
GsmCellLocation cellLocation = (GsmCellLocation)telephonyManager.getCellLocation();
int cellid= cellLocation.getCid();
int celllac = cellLocation.getLac();
If you want to get location without GPS then you should use NETWORK_PROVIDER to get location :
I have taken this module from AndroidHive website You can refer more there.
Your query will be solved with this method getLocation()
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
You can use NETWORK_PROVIDER as service parameter in the method getLastKnownLocation.
I am getting my current location in the form of latitudes and longitudes. My problem is that once I get the coordinates it doesn't get updated when I move to another location.I think onLocationChanged method is not getting called. I read here http://www.lengrand.fr/2013/10/onlocationchanged-is-never-called-on-android/ that it doesn't get called by itself. I have gone through most of the tutorials and can't find a solution.So how can I call onLocationChanged method in my service. Please suggest me step by step.
My codes are as follow:
public class GPSTracker extends Service implements LocationListener {
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
}
#Override
public void onLocationChanged(Location location) {
getLocation();
}
Make sure you requestLocationUpdates(...) from the LocationManager (which in your case it seems you do)
If your inside a building and your device doesn't get GPS fix onLocationChanged(...) is not called, I had the same issue (when debugging in my home) but going outside I saw that the function is called once GPS fix is retrieved.
try
#Override
public void onLocationChanged(Location location)
{
Toast.makeText(getApplicationContext(), "My Position !!!"+ location.getLatitude + location.getLongitude,
Toast.LENGTH_LONG).show();
}
It is weird that you are even getting a single location update. From you code it looks like you call getLocation() when you recieve a location change, but you then only setup your location requests inside of the getLocation() function (i.e. you should never enter the getLocation() function). This is how I implemented a location listener for gps data:
Note: I used this in a service, but I did not have my service implement LocationListener.
private void setupLocationUpdates() {
// Acquire a reference to the system Location Manager
mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
mLocationListener = new LocationListener() {
// Called when the location has changed.
public void onLocationChanged(Location location) {
mLocation = location;
}
}
// Called when the provider is disabled by the user.
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.d(TAG, "Status Changed: " + String.valueOf(status) + " Provider:" + provider);
}
// Called when the provider is enabled by the user.
public void onProviderEnabled(String provider) {
if(provider.equalsIgnoreCase("gps")) setNotification(Constants.GPS_ENABLED);
Log.d(TAG, "Provider: " + provider + " ENABLED");
}
// Called when the provider status changes.
public void onProviderDisabled(String provider) {
if(provider.equalsIgnoreCase("gps")) setNotification(Constants.GPS_DISABLED);
Log.d(TAG, "Provider: " + provider + " DISABLED");
}
};
mlocationProvider = LocationManager.GPS_PROVIDER;
// Register for location updates
mLocationManager.requestLocationUpdates(mlocationProvider, 0, 0, mLocationListener);
// Add a GPS Listener to notify when searching for signal and when fix is acquired
mGpsListener = new GpsListener();
mLocationManager.addGpsStatusListener(mGpsListener);
}
I am testing my app on emulator with a gpx file.
Coordinates change, but bearing and speed are always zero.
I've checked my LocationManager settings, and both .supportsSpeed() and .supportsBearing() return true.
My GPS code is almost one-to-one with this one http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/ but this part is most important so I paste it here:
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
Log.d("GPS support",((Boolean)locationManager.getProvider(locationManager.GPS_PROVIDER).supportsBearing()).toString());
Log.d("GPS support",((Boolean)locationManager.getProvider(locationManager.GPS_PROVIDER).supportsSpeed()).toString());
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
I've only added this code
#Override
public void onLocationChanged(Location location) {
this.location = location;
}
I instantiate GPSTracker object in activity's onCreate method, and then use gps.getLocation() where needed.
My .gpx file used for testing is available here: http://snk.to/f-cdzj45ic
Tried it on a physical device, and worked well.
I just thought that gpx with list of waypoints is enough, and bearing and speed will be calculated from it.
Recently, I created a simple application to get the GPS location and display it on an Android phone.
In the beginning I was able to get the location after a few tries. But, after I reinstalled the APK file, the getLastKnownLocation() always returns a null value.
The development environment:
API 10 Gingerbread 2.3.6
GPS provider is used
Below is the code I applied to my Android project:
public class MyActivity extends MapActivity {
protected void onCreate(Bundle savedInstanceState) {
mapView = (MapView) findViewById(R.id.myTripMap);
mapController = mapView.getController();
mapView.setSatellite(false);
mapView.setStreetView(true);
mapView.displayZoomControls(false);
mapView.setBuiltInZoomControls(true);//
mapView.setClickable(true);
mapController.setZoom(14);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
provider = locationManager.getBestProvider(criteria, true);
location = locationManager.getLastKnownLocation(provider);
updateMyCurrentLoc(location);
locationManager.requestLocationUpdates(provider, 2, 1, locationListener);
}
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateMyCurrentLoc(location);
}
public void onProviderDisabled(String provider) {
updateMyCurrentLoc(null);
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status,
Bundle extras) {
}
};
private void updateMyCurrentLoc(Location location) {
if (location != null) {
// other codes to get the address and display
Toast.makeText(getBaseContext(), "provider used : " + provider).show(); //testing purpose
} else {
str = "No location found";
Toast.makeText(getBaseContext(), str, Toast.LENGTH_SHORT).show();
}
}
}
Can anyone suggest a possible solution to solve the null value returned by getLastKnownLocation()?
Try Following Code
LocationManager locationManager = (LocationManager) getActivity()
.getSystemService(Context.LOCATION_SERVICE);
String locationProvider = LocationManager.NETWORK_PROVIDER;
Location lastlocation = locationManager.getLastKnownLocation(locationProvider);
String CurLat = String.valueOf(lastlocation.getLatitude());
String Curlongi= String.valueOf(lastlocation.getLongitude());
This solution is my little improvement for code by Ravi Tamada.
public Location getLocation() {
int MIN_TIME_BW_UPDATES = 10000;
int MIN_DISTANCE_CHANGE_FOR_UPDATES = 10000;
try {
locationManager = (LocationManager) getApplicationContext()
.getSystemService(LOCATION_SERVICE);
boolean isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean isPassiveEnabled = locationManager
.isProviderEnabled(LocationManager.PASSIVE_PROVIDER);
boolean isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isGPSEnabled || isNetworkEnabled || isPassiveEnabled) {
this.canGetLocation = true;
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled && location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
}
if (isPassiveEnabled && location == null) {
locationManager.requestLocationUpdates(
LocationManager.PASSIVE_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
}
}
if (isNetworkEnabled && location == null) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
}
}else{
return null;
}
} catch (Exception e) {
e.printStackTrace();
}
You just need to add one more line into the code
if (locationManager != null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
} else {
Toast.makeText(
mContext,
"Location Null", Toast.LENGTH_SHORT).show();
}
}
I got the same issue after re-install via eclipse.
I solved going to Android settings / Security / app permissions and confirm location permissions to the application.
in my app I am able to use the GPS but the problem is that it always getting me the same location. Everytime I am retrieving the location from that on, it gives me the same value. First time it was fetched and I was online, wirelessly. Then i went out with only the GPS and even if I was a mile away location was the same. I enabled 3g and still the same.
I send my app to a friend of mine, he got a different first time location and then he sees the same no matter where he goes.
Here is my code:
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
// System.out.println("Network enabled");
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
// System.out.println("GPS enabled");
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
#Override
public void onLocationChanged(Location location) {
// mAct.playToastMessage("Location Changed");
getLocation();
// mAct.setGPSText(location.getLatitude(),location.getLongitude());
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
In this For the parameter of MIN_TIME_BW_UPDATES and MIN_DISTANCE_CHANGE_FOR_UPDATES you have to set the 0 and 0. If it is set to 0,0. It will give you the location update as quick as possible. If you set larger value for the you never get the updated value until your condition satisfied. I hope this could solves your problem.
#Override
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = “My current location is: “ +
“Latitude = “ + loc.getLatitude() +
“Longitude = “ + loc.getLongitude();
Toast.makeText( getApplicationContext(),Text,Toast.LENGTH_SHORT).show();
}
Source : Tutorial on GPS to get Current Location.