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.
Related
I use these code to get location
But sometime I cannot get the location inside building, and that time the WIFI is connected, Location is enabled.
How can I make sure getLastKnownLocation will return location when it is able to get location?
LocationManager locationManager = (LocationManager)this.getSystemService(LOCATION_SERVICE);
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null)
{
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
if(location==null)
{
Toast.makeText(getApplicationContext(),"no location", Toast.LENGTH_SHORT).show();
return;
}
This works for me...
public void updateLoction(View view){
locationManger = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = locationManger.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
txtLat.setText("" + location.getLatitude());
txtLon.setText("" + location.getLongitude());
}
locationManger.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
}
private void setLocation(Location location) {
if (location != null) {
txtLat.setText("" + location.getLatitude());
txtLon.setText("" + location.getLongitude());
}
locationManger.removeUpdates(this);
}
I have implemented an android application using GoogleApiClient which sends the Location updates after every 5m displacement and it is working fine.
Consider sometimes will not get Gps Signal.In such situation how can we get the update can anyone please help me how to handle this situation?
try this,
Location nwLocation = appLocationService
.getLocation(LocationManager.NETWORK_PROVIDER);
if (nwLocation != null) {
double latitude = nwLocation.getLatitude();
double longitude = nwLocation.getLongitude();
Toast.makeText(
getApplicationContext(),
"Mobile Location (NW): \nLatitude: " + latitude
+ "\nLongitude: " + longitude,
Toast.LENGTH_LONG).show();
}
the complete tutorial can be found here
please have a look this link.
and i used this code to fetch lat long:
public void getCurruntLocation() {
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
}
and
private class mylocationlistener implements LocationListener {
#Override
public void onLocationChanged(Location location) {
if (location != null) {
Log.d("LOCATION CHANGED", location.getLatitude() + "");
Log.d("LOCATION CHANGED", location.getLongitude() + "");
latLng = location.getLatitude() + "," + location.getLongitude();
Toast.makeText(RecentActivity.this,
location.getLatitude() + "" + location.getLongitude(),
Toast.LENGTH_LONG).show();
}
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
and simple call getCurruntLocation() where you want to fetch.
GoogleApiClient uses a LocationRequest class for setting number of parameters. One of them - .setPrioryty. If you are using LocationRequest.PRIORITY_HIGH_ACCURACY in some cases googleApiClient won't call onLocationChanged() without gps, due to lack of accuracy of GPRS coordinates.
I am trying to get latitude and longitude but sometime network is available but I am not getting value of latitude and longitude. I am using MyLocationListener class and put condition all but some time value is not getting.
protected void showCurrentLocation()
{
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null)
{
counter++;
latitude=location.getLatitude();
longitude=location.getLongitude();
altitude=location.getAltitude();
}
}
private class MyLocationListener implements LocationListener
{
#Override
public void onLocationChanged(Location location)
{
counter++;
latitude=location.getLatitude();
longitude=location.getLongitude();
altitude=location.getAltitude();
}
#Override
public void onStatusChanged(String s, int i, Bundle b)
{
}
#Override
public void onProviderDisabled(String s)
{
}
#Override
public void onProviderEnabled(String s)
{
}
}
Here Best way to get Longitude Latitude:
/** PROCESS for Get Longitude and Latitude **/
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
longitude = String.valueOf(location.getLongitude());
latitude = String.valueOf(location.getLatitude());
Log.d("msg", "changed Loc : "+longitude + ":"+latitude);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// getting GPS status
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// check if GPS enabled
if(isGPSEnabled){
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(location != null)
{
longitude = String.valueOf(location.getLongitude());
latitude = String.valueOf(location.getLatitude());
Log.d("msg", "Loc : "+longitude + ":"+latitude);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}else
{
/*
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setCostAllowed(true);
String provider = locationManager.getBestProvider(criteria, true);
*/
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if(location != null)
{
longitude = String.valueOf(location.getLongitude());
latitude = String.valueOf(location.getLatitude());
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}else
{
longitude = "0.00";
latitude = "0.00";
}
}
}
if device is not able to get currentLocation using GPS then it'll be take fron NetworkProvider or else it'll take 0,0 as my requirement but you can modify as per your requirement
May it'll helpful to you.
Happy Coding :D
See, this is a very common problem. In order to have exact Latitude and Longitude ,You must use GPS also it must me activated on the mobile device but GPS too have some limitations. GPS works most efficiently under open sky. you will not have a clear range inside a building. So try your code under open sky and check the response.
I tried to get current location using GPS Providers.
But it's not working properly as far as I know. In case of Network provider it returns Tower values, not exactly the satellites values.
Here with I attached some of code samples related to GPS Provider.
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L, 500.0f,this);
public void onLocationChanged(Location location) {
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
String currentLocation = "Lat: " + lat + " Lng: " + lng;
txted.setText(currentLocation);
p = new GeoPoint((int) lat * 1000000, (int) lng * 1000000);
mc.animateTo(p);
}
}
public void onProviderDisabled(String provider) {
// required for interface, not used
}
public void onProviderEnabled(String provider) {
// required for interface, not used
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// required for interface, not used
}
make sure that "use GPS satellites " is enabled,
go from settings -> location and security-> use GPS satellites.
Try this
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,this);
later you get updates as per your requirement.
I have gone through many posts on SO regarding this issue:
Tried everything in Here,
Here and Here Nothing works. Everytime location is null. On device and on emulator :(. My GPS is on,internet is on and my manifest has following permissions:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
I use following code to get the location i.e the longitude and latitude of the device...however in every case I get location as null
public void find_Location() {
Log.d("Find Location", "in find_location");
String location_context = Context.LOCATION_SERVICE;
locationManager = (LocationManager) getApplicationContext()
.getSystemService(location_context);
List<String> providers = locationManager.getProviders(true);
for (String provider : providers) {
locationManager.requestLocationUpdates(provider, 1000, 0,
new LocationListener() {
public void onLocationChanged(Location location) {}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider,
int status, Bundle extras) {
}
});
Location location = locationManager.getLastKnownLocation(provider);
if (location == null) {
Toast.makeText(LbsGeocodingActivity.this, "Location Not found",
Toast.LENGTH_LONG).show();
} else {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
Toast.makeText(LbsGeocodingActivity.this,
"LAT..." + latitude + "\nLONG..." + longitude,
Toast.LENGTH_LONG).show();
// addr=ConvertPointToLocation(latitude,longitude);
// String temp_c=SendToUrl(addr);
}
}
}
It takes some time before the position is determined, and it can change over time. It's probably just not available yet when you check it.
When a position fix becomes available, you will be notified in onLocationChanged.
How could I be so stupid..My bad....In settings Use Wireless networks was not selected!....That cause all the problems !!
Now I am able to get a location.
It took me 16 hrs to get to this...my productivity going down for sure! :(