I have an app that is already asking for runtime permissions to activate the localization permission and I have all ready to receive longitude and latitude. My problem now is only to get the latitude and longitude from the device itself.
This is my method, assume that the method goes to the else statement because I already have the permissions handling working
if (!checkPermissions()) {
requestPermissions()
} else {
//get latitude and long here
}
Here is a sample code
1.LocationManager & Listener
private LocationManager locationManager;
private LocationListener locationListener;
2.Setting manager & Listener
locationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
}
}
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
String locationProvider = LocationManager.GPS_PROVIDER;
currentLocation = locationManager.getLastKnownLocation(locationProvider);
if (currentLocation != null) {
double lng = currentLocation.getLongitude();
double lat = currentLocation.getLatitude();
Log.d("Log", "longtitude=" + lng + ", latitude=" + lat);
}
Related
// GET LATITUDE AND LONGITUDE BY INTERNET
LocationManager lManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
boolean netEnabled = lManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (netEnabled) {
lManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
Location location = lManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null)
{
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
I am trying to get lat and long using only the internet. The code above works only if I open the location. what did I have to change?
when i am try to get latitude and longitude from network provider in kitkat the onLocationChanged method is not working. My code is:
double dlat,dlang;
listener = new MyLocationListener();
locationManager = (LocationManager)context. getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000,100, listener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 100, listener);
public class MyLocationListener implements LocationListener
{
public void onLocationChanged(final Location loc)
{
dlat = loc.getLatitude();
dlang = loc.getLongitude();
}
}
}
I am trying to get the latitude and longitude of the current location using the following:
GoogleMap map;
map = ((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
map.setMyLocationEnabled(true);
lat = map.getMyLocation().getLatitude();
lng = map.getMyLocation().getLongitude();
For some reason the last two lines are causing the app to crash due to a NullPointerException. What am I doing wrong?
The biggest thing that bugs me about this is the fact that map.setMyLocationEnabled(true); does indeed set my current location.
Thanks to anyone looking at this
Try this:
public Double Lat = null;
public Double Lng = null;
String LatLng = null;
private LocationClient mLocationClient;
in your onCreateView() add this
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.yourLayout, container, false);
mLocationClient = new LocationClient(getActivity(), this, this);
rootView.findViewById(R.id.ATestButton).setOnClickListener(
// Get the current location
Location currentLocation = mLocationClient.getLastLocation();
Lat = currentLocation.getLatitude();
Lng = currentLocation.getLongitude();
LatLng = Double.toString(Lat) + "," + Double.toString(Lng);
Toast.makeText(getActivity(), LatLng, 0).show();
});
Look at my complete github for a working example.
// I would a test button so can click it to see if anything is returned.
public void turnGPSOn() {
String provider = Settings.Secure.getString(getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if (!provider.contains("gps")) {
final Intent poke = new Intent();
poke.setClassName("com.android.settings",
"com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
}
void getLocation()
{
locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (!locManager
.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
turnGPSOn();
}
try {
locManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 1000, 10,
locationListener);
} catch (Exception ex) {
}
}
}
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateWithNewLocation(location);
}
public void onProviderDisabled(String provider) {
updateWithNewLocation(null);
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
private void updateWithNewLocation(Location location) {
String latLongString = "";
try {
if (location != null) {
Log.e("test", "gps is on send");
latitude = Double.toString(location.getLatitude());
longitude = Double.toString(location.getLongitude());
Log.e("test", "location send");
latLongString = "Lat:" + latitude + "\nLong:" + longitude;
Log.w("CurrentLocLatLong", latLongString);
} else {
latLongString = "No location found";
}
} catch (Exception e) {
}
}
Your app is crashing because
map.getMyLocation()
returns null if there is no location data available.So you can have !=null check like this
if( map.getMyLocation() !=null){
lat = map.getMyLocation().getLatitude();
lng = map.getMyLocation().getLongitude();
}
Also this method is deprecated, so you should use FusedLocationProviderApi instead. See official documentation here
Here is a very good implementation of FusedLocation Api, you can check out that too.
map.getMyLocation() is null
you should check for that condition
I have found a solution. While I am still not sure why the other methods is giving me a null pointer, the below works just fine and will suit my needs.
LocationManager locman = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = locman .getLastKnownLocation(LocationManager.GPS_PROVIDER);
double lng = location.getLongitude();
double lat = location.getLatitude();
I'm trying to get GPS Longitude & Latitude.
Everything is working in case that the GPS is turning on while using any other program that turning it on.
But when i trying to use only my app , the GPS is not turning on.
here is my code:
m_locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
String provider = m_locationManager.getBestProvider(m_c, false);
Location location = m_locationManager.getLastKnownLocation(provider);
if (location != null)
{
double lng = location.getLongitude();
double lat = location.getLatitude();
gpsLocationLon.setText("" + lng);
gpsLocationLat.setText("" + lat);
}
else
{
gpsLocationLon.setText("No Provider");
gpsLocationLat.setText("No Provider");
}
public void onLocationChanged(Location location) {
double lng = location.getLongitude();
double lat = location.getLatitude();
if(null != gpsLocationLat && null != gpsLocationLon)
{
gpsLocationLon.setText("" + lng);
gpsLocationLon.setText("" + lat);
}
}
what did i miss?
You need to start listening to location updates once you've found the best provider.
if (locationManager.isProviderEnabled(provider)) {
locationManager.requestLocationUpdates(provider, 0, 0, this);
// ^^ This will start listening for location updates
// depending on your provider.
} else {
Log.d(LOGTAG, provider + " not enabled");
}
Remember that there are two types of providers, gps and network. So it depends on the criteria(m_c) which one is selected.
If you want to make sure that you want to listen to GPS as well as Network Updates, remove the Criteria variable and try this :
if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
} else {
Log.d(LOGTAG, "network provider not enabled");
}
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
} else {
Log.d(LOGTAG, gps provider not enabled");
}
Edit 1:
m_locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (m_locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
m_locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
Location location = m_locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
else {
Log.d(LOGTAG, "network provider not enabled");
}
if (m_locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
m_locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
else {
Log.d(LOGTAG, "gps provider not enabled");
}
if (location != null)
{
double lng = location.getLongitude();
double lat = location.getLatitude();
gpsLocationLon.setText("" + lng);
gpsLocationLat.setText("" + lat);
}
else
{
gpsLocationLon.setText("No Provider");
gpsLocationLat.setText("No Provider");
}
public void onLocationChanged(Location location) {
double lng = location.getLongitude();
double lat = location.getLatitude();
if(null != gpsLocationLat && null != gpsLocationLon)
{
gpsLocationLon.setText("" + lng);
gpsLocationLon.setText("" + lat);
}
}
I have a problem to fixed position. I use getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
but always return null, i have set the permissions in your AndroidManifest.xml.
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
and enabled in Settings --> Location and Security --> location through network.
TextView locationShow = (TextView) this.findViewById(R.id.location);
double latitude = 0.0, longitude = 0.0;
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
else {
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
if (location != null) {
Log.i("SuperMap", "Location changed : Lat: " + location.getLatitude() + " Lng: " +
location.getLongitude());
}
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 0,
locationListener);
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
locationShow.setText("经度：" + latitude + "纬度：" + longitude);
I find that other apps can show the location correctly, so maybe there something wrong with my code.
getLastKnownLocation() give the last valid cached location.
You are trying to get the cached location from the Network Provider. You have to wait for a few minutes till you get a valid fix. Since the Network Provider's cache is empty, you are obviously getting a null there.