After registering with LocationManager for LocationManager.NETWORK_PROVIDER , the callback onStatusChanged() is never called even when data or network is switched on/off during registered period. Is this method not valid for Network based providers ?
Try this :
package com.mytest;
import android.R;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.widget.TextView;
public class NetworkTest extends Activity {
private LocationManager locationManager;
private TextView textView;
private final LocationListener networkLocationListener=new LocationListener(){
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
switch (status) {
case LocationProvider.AVAILABLE:
textView.setText(textView.getText().toString()
+ "Network location available again\n");
break;
case LocationProvider.OUT_OF_SERVICE:
textView.setText(textView.getText().toString()
+ "Network location out of service\n");
break;
case LocationProvider.TEMPORARILY_UNAVAILABLE:
textView.setText(textView.getText().toString()
+ "Network location temporarily unavailable\n");
break;
}
}
#Override
public void onProviderEnabled(String provider) {
textView.setText(textView.getText().toString()
+ "Network Provider Enabled\n");
}
#Override
public void onProviderDisabled(String provider) {
textView.setText(textView.getText().toString()
+ "Network Provider Disabled\n");
}
#Override
public void onLocationChanged(Location location) {
textView.setText(textView.getText().toString()
+ "New network location: "
+ String.format("%9.6f", location.getLatitude()) + ", "
+ String.format("%9.6f", location.getLongitude()) + "\n");
}
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activitynetwork);
textView = (TextView) findViewById(R.id.textview);
locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
}
#Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 5000, 0,
networkLocationListener);
}
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(networkLocationListener);
}
}
It works for me.
Related
I am having trouble implementing a LocationListener.
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
TextView latitudeTV;
TextView longitudeTV;
TextView altitudeTV;
TextView locationNameTV;
double latitude;
double longitude;
double altitude;
String locationName;
LocationManager locationManager;
Location location;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
latitudeTV = (TextView) findViewById(R.id.latitude);
longitudeTV = (TextView) findViewById(R.id.longitude);
altitudeTV = (TextView) findViewById(R.id.altitude);
locationNameTV = (TextView) findViewById(R.id.locationName);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 0, locationListener);
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
onLocationChanged(location);
LocationListener locationListener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
longitude = location.getLongitude();
latitude = location.getLatitude();
altitude = location.getAltitude();
locationName = "Placeholder";
longitudeTV.setText("Longitude: \n" + longitude + "°");
latitudeTV.setText("Latitude: \n" + latitude + "°");
altitudeTV.setText("Altitude: \n" + altitude + "m");
locationNameTV.setText("Location: \n" + locationName);
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
}
};
}
}
I'm not sure if it's a syntax issue or a scoping issue, but I keep getting "unable to resolve symbol" errors. It's acting like I haven't implemented the LocationListener methods. I have tried adding implements LocationListener to MainActivity and that shows an error saying I have not implemented the LocationListener methods. I'm not sure where my mistake is.
EDIT:
I've changed my code per your answers. When I try to implement //locationManager.requestLocationUpdates(Context.LOCATION_SERVICE, 5000, 0, this); I get the following when trying to launch the app: LocationTestApp keeps stopping. I've commented out that line, and the app works again.
public class MainActivity extends AppCompatActivity implements LocationListener {
TextView latitudeTV;
TextView longitudeTV;
TextView altitudeTV;
double latitude;
double longitude;
double altitude;
LocationManager locationManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
latitudeTV = (TextView) findViewById(R.id.latitude);
longitudeTV = (TextView) findViewById(R.id.longitude);
altitudeTV = (TextView) findViewById(R.id.altitude);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
//locationManager.requestLocationUpdates(Context.LOCATION_SERVICE, 5000, 0, this);
Location location = locationManager.getLastKnownLocation(locationManager.NETWORK_PROVIDER);
onLocationChanged(location);
}
#Override
public void onLocationChanged(Location location) {
longitude = location.getLongitude();
latitude = location.getLatitude();
altitude = location.getAltitude();
longitudeTV.setText("Longitude: \n" + longitude + "°");
latitudeTV.setText("Latitude: \n" + latitude + "°");
altitudeTV.setText("Altitude: \n" + altitude + "m");
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
}
}
A LocationListener class, in this case an Activity, should be defined as below:
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
public class MainActivity extends AppCompatActivity implements LocationListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
...
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 0, this); // Note: You pass this, so the overridden methods
}
#Override
public void onLocationChanged(Location location) {
// Do your stuff here
}
#Override
public void onProviderDisabled(String provider) {}
#Override
public void onProviderEnabled(String provider) {}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
And this is the solution in jle's comments.
But if you want to use the locationListener that you've declared in your onCreate, you should declare it before using it, in this way:
...onCreate(...) {
...
LocationListener locationListener = new LocationListener() {...} // Define this...
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 0, locationListener); // ...and then call this
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
onLocationChanged(location);
}
First I apologize for the duplication, I know this question was asked and I tried to follow up the existing answers, but it wont work. So if you can please see my code and say what is wrong or missing, that would help me a lot.
Here's the activity, it uses only the Log (no GUI).
import android.app.Activity;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends Activity implements LocationListener {
private LocationManager lManager;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (lManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER))
lManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
0, 0, this);
else
Log.i("Test", "network provider unavailable");
Location lastKnownLocation =
lManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (lastKnownLocation != null) {
Log.i("Test", lastKnownLocation.getLatitude() + ", "
+ lastKnownLocation.getLongitude());
lManager.removeUpdates(this);
} else
Log.i("Test", "null");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void onLocationChanged(Location location) {
Log.i("Test", "location changed: " + location.getLatitude() + ", "
+ location.getLongitude());
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
when I try to run the app everything seems to work but latitude and longitude wont show on the log. I am using a real device with network location on for testing.
The reason I couldn't get the location is the cellular company does not give that information (NETWORK_PROVIDER uses cellular antenna triangulation to determine location. Cellular company can provide or deny you this information).
I am trying to get a location (latitude, longitude) on my Android smartphone (HTC Desire HD), using Wifi-network and GPS.
This is the code I use, only I keep getting "Location not available"
Iam working with Eclipse IDE.
import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import com.example.shortsproject.R;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class LocationGetter extends Activity implements LocationListener {
private TextView latituteField;
private TextView longitudeField;
private LocationManager locationManager;
private String provider;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location);
latituteField = (TextView) findViewById(R.id.locationtext);
longitudeField = (TextView) findViewById(R.id.locationtext2);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the location provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
} else {
latituteField.setText("Location not available");
longitudeField.setText("Location not available");
}
}
/* Request updates at startup */
#Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
/* Remove the locationlistener updates when Activity is paused */
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
#Override
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider) {
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
}
Can someone help me with this?
What I am doing is trying to get a basic GPS working and can't figure out the problem (there is no errors coming up). When i run it on the emulator it crashes. I am using android 2.2
package Weather.app;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.Geocoder;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class WeatherAppActivity extends Activity{
/** Called when the activity is first created. */
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds
protected LocationManager locationManager;
protected LocationListener MyLocationListener;
protected Button findButton;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findButton = (Button) findViewById(R.id.findButton);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(
locationManager.GPS_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
(LocationListener) this
);
findButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
showCurrentLocation();
}
});
}
protected void showCurrentLocation() {
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
String message = String.format(
"Current Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
Toast.makeText(WeatherAppActivity.this, message,
Toast.LENGTH_LONG).show();
}
final class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location location) {
String message = String.format(
"New Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
Toast.makeText(WeatherAppActivity.this, message, Toast.LENGTH_LONG).show();
}
#Override
public void onStatusChanged(String s, int i, Bundle b) {
Toast.makeText(WeatherAppActivity.this, "Provider status changed",
Toast.LENGTH_LONG).show();
}
#Override
public void onProviderDisabled(String s) {
Toast.makeText(WeatherAppActivity.this,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_LONG).show();
}
#Override
public void onProviderEnabled(String s) {
Toast.makeText(WeatherAppActivity.this,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_LONG).show();
}
}
}
}
This is also in my manifest:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES" />
I have updated this code as I have made a few changes
Here is one example of working basic GPS activity:
public class UseGpsActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
/* Class My Location Listener */
public class MyLocationListener implements LocationListener{
#Override
public void onLocationChanged(Location loc) {
// TODO Auto-generated method stub
double lati = loc.getLatitude();
double longi = loc.getLongitude();
String Text = "My current location is: " + "Latitud = " + lati + "Longitud = " + longi;
Toast.makeText(getApplicationContext(),Text,Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
}
Unless some code is missing in your post MyLocationListener (you should not user upper case identifiers for instance fields!) is not initialized when passing the reference (i.e. null) to requestLocationUpdates().
You don't need to create another LocationListener, the statement
WeatherAppActivity extends Activity implements LocationListener
and the overriden methods
#Override
public void onLocationChanged(Location location)
etc means you have one in your main class already, so get rid of the inner class MyLocationListener completely.
Put your Toast code etc inside the overriden listener methods in the main class.
Then in onCreate() have :
locationManager.requestLocationUpdates(
locationManager.GPS_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
this
);
I have a tutorial on Android location services on my blog. I'm not sure of your specific error but you can look at the code to see if it helps you!
http://www.scotthelme.co.uk/blog/android-location-services/
I have created one service and also added it in manifest. When I use timer to call this service periodically and in timer I have used location manager to get location of user contin. But there is error like that:
05-11 11:57:17.574:
ERROR/AndroidRuntime(3305):
java.lang.RuntimeException: Can't
create handler inside thread that has
not called Looper.prepare()
Tell me where is problem in my code.
code is here
package com.collabera.labs.sai;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class SimpleService extends Service {
Timer mytimer;
#Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate() {
super.onCreate();
Toast.makeText(this,"Service created ...", Toast.LENGTH_LONG).show();
mytimer = new Timer();
mytimer.schedule(new TimerTask() {
#Override
public void run() {
// TODO Auto-generated method stub
//getdata();
LocationManager mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
mlocListener);
}
},0,1000);
}
#Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service destroyed ...", Toast.LENGTH_LONG).show();
}
public void getdata()
{
}
public class MyLocationListener implements LocationListener {
#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();*/
Log.d("TAG", "Starting..");
}
#Override
public void onProviderDisabled(String provider) {
/*Toast.makeText(getApplicationContext(), "Gps Disabled",
Toast.LENGTH_SHORT).show();*/
}
#Override
public void onProviderEnabled(String provider) {
/*Toast.makeText(getApplicationContext(), "Gps Enabled",
Toast.LENGTH_SHORT).show();*/
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}/* End of Class MyLocationListener */
}
Toast.makeText(this, "Service destroyed ...", Toast.LENGTH_LONG).show();
You can't modify UI from the non-UI thread. Services are never executed on the UI thread. Log this instead of making a Toast.