Develop Reference

Getting location on service does not work

I am using location service to listen location on background. But I have a problem with getting current location in service. It does not give me the proper result but 0,0 as coordinates. When I do the same operations on main activity, it gives the expected result. I think it is about context given to the gpstracker as a parameter but do not know what to do.
public class LocationService extends Service {
Context context;
Timer timer;
String latitude, longitude;
private String id;
GPSTracker gps;
public LocationService() {
}
#Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();
}
#Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
id = intent.getStringExtra("id");
timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
int isHere = isHere();
Log.i("isHere", isHere + "");
updateUserStatus(isHere);
}
}, 0, 200000);
return START_STICKY;
}
private int isHere() {
gps = new GPSTracker(context);
if (!gps.canGetLocation()) {
gps.showSettingsAlert();
}
if (gps.canGetLocation()) {
latitude = gps.getLatitude() + "";
longitude = gps.getLongitude() + "";
if (Math.abs(39.875303 - Double.parseDouble(latitude)) <= 0.001 || Math.abs(32.879980 - Double.parseDouble(longitude)) <= 0.001)
return 1;
else
return 0;
}
return 0;
}
private void updateUserStatus(int isHere) {
Call<Kisi> x = ManagerAll.getInstance().updateLocation(id, isHere);
x.enqueue(new Callback<Kisi>() {
#Override
public void onResponse(Call<Kisi> call, Response<Kisi> response) {
if (response.isSuccessful())
Log.i("durum", "başarılı");
}
#Override
public void onFailure(Call<Kisi> call, Throwable t) {
}
});
}
}
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
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;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* #return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
#Override
public void onLocationChanged(Location location) {
}
#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;
}
}
Taken here

try with this code.
this code work for me.
package com.yourpackage.tracker;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import com.orhanobut.hawk.Hawk;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import id.glite.transporter.GLiteApplication;
import id.glite.transporter.data.DataManager;
import id.glite.transporter.data.model.post.LocationUpdate;
import id.glite.transporter.util.rx.scheduler.SchedulerUtils;
import io.nlopez.smartlocation.SmartLocation;
import timber.log.Timber;
public class LocationTrackerService extends Service {
// constant
public static final long NOTIFY_INTERVAL = 3 * 60 * 1000; // 3 minutes
// run on another Thread to avoid crash
private Handler mHandler = new Handler();
// timer handling
private Timer mTimer = null;
private DataManager dataManager;
private Context mContext;
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
mContext = this;
dataManager = GLiteApplication.get(getBaseContext()).getComponent().dataManager();
// cancel if already existed
if (mTimer != null) {
mTimer.cancel();
} else {
// recreate new
mTimer = new Timer();
}
// schedule task
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);
}
class TimeDisplayTimerTask extends TimerTask {
#Override
public void run() {
// run on another thread
// display toast
mHandler.post(this::doTrackLocation);
}
private void doTrackLocation() {
if (idTask != null) {
SmartLocation.with(getBaseContext()).location()
.start(location -> {
List<Double> position = new ArrayList<>();
position.add(0, location.getLatitude());
position.add(1, location.getLongitude());
});
}
}
}
}

Make sure you enable the GPS on your phone and allowing the location permission as well.!

getlastknownlocation() return null and App is shutting down

im trying to get current location on each several seconds and i do so with AlarmManager and LocationListener and Location Manager.
before setting the alarm i need to get current location for calculating the general distance.
when i run my app on AVD and set Lat & Long manually with DDMS the App works fine and do the job.
the problem is when the App is running on real device, the app is immediately shutting down (it fails also when i dont set position manually).
what can be the problem please? i only need to get current location when a button is clicked and each several seconds...
GPSTracker.Java :
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
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) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, 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.
return location;
}
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;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS() {
if (locationManager != null) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, 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.
return;
}
locationManager.removeUpdates(GPSTracker.this);
Log.d("GPS is stopped", "GPS is stopped");
}
}
/**
* Function to get latitude
* */
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* #return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
#Override
public void onLocationChanged(Location location) {
}
#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;
}
Alarm.Java:
#Override
public void onReceive(Context context, Intent intent) {
/** PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
wl.acquire();**/
// Put here YOUR code.
//Intent i= new Intent(this,AlarmActivity.class);
//startActivity(i);
try {
gps = new GPSTracker(context);
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
Location CurrLoc = gps.getLocation();
Location DistLoc = new Location("wow");
DistLoc.setLatitude(32.159141);
DistLoc.setLongitude(34.922564);
float CurrDistance = CurrLoc.distanceTo(DistLoc);
SharedPreferences prefs = context.getSharedPreferences("AlarmDistanceAndUserStatus", Context.MODE_PRIVATE);
float AlarmDistance=prefs.getFloat("AlarmDistance",0);
Log.d("distance invoke alarmRe",String.valueOf(AlarmDistance));
Log.d("current distance is:",String.valueOf(CurrDistance));
// Log.d("Run once -2",String.valueOf(AlarmActivity.RUN_ONCE));
// Log.d("distance invoke alarm-2",String.valueOf(AlarmActivity.AlarmDistance));
if(CurrDistance>=0 && CurrDistance<=50){
SharedPreferences.Editor editor=prefs.edit();
editor.putBoolean("UserStatus",false);
editor.commit();
this.CancelAlarm(context);
Bundle bundle = intent.getExtras();
String message = bundle.getString("alarm_message");
Intent newIntent = new Intent(context, AlarmActivity.class);
newIntent.putExtra("alarm_message", message);
newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(newIntent);
}
else if(AlarmDistance>=CurrDistance){
Bundle bundle = intent.getExtras();
String message = bundle.getString("alarm_message");
Intent newIntent = new Intent(context, AlarmActivity.class);
newIntent.putExtra("alarm_message", message);
newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(newIntent);
}
Toast.makeText(context, "Your Location is - \nLat: " + latitude + "\nLong: " + longitude + " distanceto:" + CurrDistance + " from AlaramSet!!!", Toast.LENGTH_LONG).show();
Log.d("onReceive", "onReceive");
} catch (Exception e) {
Toast.makeText(context, "There was an error somewhere, but we still received an alarm", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
// Toast.makeText(context, "Alarm !!!!!!!!!!", Toast.LENGTH_LONG).show(); // For example
//wl.release();
}
public void SetAlarm(Context context,int SecondsInterval) {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.SECOND, SecondsInterval);
AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent(context, Alarm.class);
PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
am.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), (1000 * SecondsInterval), pi); // Millisec * Second * Minute
Toast.makeText(context, "Alarm Set!!!", Toast.LENGTH_LONG).show();
}
public void CancelAlarm(Context context) {
Intent intent = new Intent(context, Alarm.class);
PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(sender);
Toast.makeText(context, "Alarm Canceled!!!", Toast.LENGTH_LONG).show();
}
AlarmActivity.Java :
public class AlarmActivity extends AppCompatActivity {
public static boolean RUN_ONCE = true;
GPSTracker gps;
Alarm alarm;
SharedPreferences sharedpref;
boolean UserStatus=true;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alarm);
alarm = new Alarm();
Log.d("Run once -2", String.valueOf(RUN_ONCE));
runOnce();
sharedpref=getSharedPreferences("AlarmDistanceAndUserStatus", Context.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedpref.edit();
UserStatus=sharedpref.getBoolean("UserStatus",true);
Log.d("UserStatus now is:", String.valueOf(UserStatus));
if(UserStatus){
Button OkStopButton=(Button)findViewById(R.id.OkStopButton);
OkStopButton.setVisibility(View.VISIBLE);
TextView WakeUpTimeTextView=(TextView)findViewById(R.id.WakeUpTimeTextView);
WakeUpTimeTextView.setVisibility(View.VISIBLE);
Button DidItButton=(Button)findViewById(R.id.DidItButton);
Button MissItButton=(Button)findViewById(R.id.MissItButton);
DidItButton.setVisibility(View.INVISIBLE);
MissItButton.setVisibility(View.INVISIBLE);
TextView DestArrivedTextView=(TextView)findViewById(R.id.DestArrivedTextView);
DestArrivedTextView.setVisibility(View.INVISIBLE);
}
else{
Button OkStopButton=(Button)findViewById(R.id.OkStopButton);
OkStopButton.setVisibility(View.INVISIBLE);
TextView WakeUpTimeTextView=(TextView)findViewById(R.id.WakeUpTimeTextView);
WakeUpTimeTextView.setVisibility(View.INVISIBLE);
Button DidItButton=(Button)findViewById(R.id.DidItButton);
Button MissItButton=(Button)findViewById(R.id.MissItButton);
DidItButton.setVisibility(View.VISIBLE);
MissItButton.setVisibility(View.VISIBLE);
TextView DestArrivedTextView=(TextView)findViewById(R.id.DestArrivedTextView);
DestArrivedTextView.setVisibility(View.VISIBLE);
}
}
private void runOnce() {
if (RUN_ONCE) {
RUN_ONCE = false;
gps = new GPSTracker(AlarmActivity.this);
if (gps.canGetLocation) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
Location loc = gps.getLocation();
Location dist = new Location("wow");
dist.setLatitude(32.159058);
dist.setLongitude(34.922536);
float FirstDistance = loc.distanceTo(dist);
Log.d("first distance",String.valueOf(FirstDistance));
//System.currentTimeMillis()
//interval time of distance check
int SecondsInterval;
if (FirstDistance >= 0 && FirstDistance <= 1000) SecondsInterval = 3;
else if (FirstDistance > 1000 && FirstDistance <= 2000) SecondsInterval = 4;
else if (FirstDistance > 2000 && FirstDistance <= 3500) SecondsInterval = 5;
else SecondsInterval = 8;
///
//check the distance to alarm user before dist. station
int MissingCount = 2;//for example-import from db
float AlarmDistance= (FirstDistance/ 10) * MissingCount;
sharedpref=getSharedPreferences("AlarmDistanceAndUserStatus",Context.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedpref.edit();
editor.putFloat("AlarmDistance",AlarmDistance);
editor.putBoolean("UserStatus",true);
editor.commit();
alarm.SetAlarm(this,SecondsInterval);
Intent newIntent = new Intent(this, MainActivity.class);
this.startActivity(newIntent);
} else {
gps.showSettingsAlert();
}
}
}
public void StopOnClick(View v) {
// gps.stopUsingGPS();
RUN_ONCE = true;
sharedpref=getSharedPreferences("AlarmDistanceAndUserStatus",Context.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedpref.edit();
editor.putFloat("AlarmDistance",0);
editor.putBoolean("UserStatus",true);
editor.commit();
alarm.CancelAlarm(this);
//back to Home Page
}
public void DidItOnClick(View v){
//Return to Home Page (e.g: MainActivity)
Intent newIntent = new Intent(this, MainActivity.class);
this.startActivity(newIntent);
RUN_ONCE = true;
sharedpref=getSharedPreferences("AlarmDistanceAndUserStatus",Context.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedpref.edit();
editor.putFloat("AlarmDistance",0);
editor.putBoolean("UserStatus", true);
editor.commit();
}
public void MissItOnClick(View v){
//go check altenative ways
RUN_ONCE = true;
sharedpref=getSharedPreferences("AlarmDistanceAndUserStatus",Context.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedpref.edit();
editor.putFloat("AlarmDistance",0);
editor.putBoolean("UserStatus",true);
editor.commit();
}
}
the failure:
Unable to start activity ComponentInfo{com.example.liorozit.gpstest/com.example.liorozit.gpstest.AlarmActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'float android.location.Location.distanceTo(android.location.Location)' on a null object reference
there's an external class which move to AlarmActivity class by Intent and invoke it's OnCraete().
what can i do please to fix the prob and get my current location? thank you!

If you want to get the Location in your activity and if is not needed to run it in a background, you could try this.
package com.jmarkstar.activitylocation;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private LocationManager locationManager;
private MyLocationListener locationListener;
private String latitude;
private String longitude;
#Override
protected void onStart() {
super.onStart();
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new MyLocationListener();
Criteria criteria = new Criteria();
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(false);
criteria.setPowerRequirement(Criteria.ACCURACY_FINE);
String bestEnabledProvider = locationManager.getBestProvider(criteria, true);
locationManager.requestLocationUpdates(bestEnabledProvider, 0, 0, locationListener);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//YOU CODE
}
private class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location location) {
makeUseOfNewLocation(location);
locationManager.removeUpdates(locationListener);
}
private void makeUseOfNewLocation(final Location location) {
if (location != null) {
String message = "position: " + location.getLatitude() + ", " + location.getLongitude() + " accuracy: " + location.getAccuracy();
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
latitude = String.valueOf(location.getLatitude());
longitude = String.valueOf(location.getLongitude());
//YOUR CODE
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
#Override
public void onProviderEnabled(String provider) {}
#Override
public void onProviderDisabled(String provider) {}
}
}

Longitude and Latitude showing 0.0 in Service

I want to make a notification that contain longitude and latitude in every 5 minutes. And I make 2 service, but I the longitude and latitude can not be displayed in my apps.
this is my GPS Service
package com.example.michael.eksperimen4gpstrack;
/**
* Created by Michael on 01/12/2015.
*/
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
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.provider.Settings;
import android.util.Log;
import java.util.Timer;
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
private static final long NOTIFY_INTERVAL = 10 * 1000; // 10 detik
private Timer mTimer = null;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
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;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* #return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
#Override
public void onLocationChanged(Location location) {
}
#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;
}
}
And this is my timer service
package com.example.michael.eksperimen4gpstrack;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Handler;
/**
* Created by Michael on 14/12/2015.
*/
public class LocService extends Service
{
public static final long NOTIFY_INTERVAL = 5*1000; // 10 detik
private android.os.Handler mHandler = new android.os.Handler();
public Timer mTimer = null;
GPSTracker gps;
public IBinder onBind(Intent arg0)
{
return null;
}
public void onCreate()
{
if(mTimer != null)
{
mTimer.cancel();
}
else
{
mTimer = new Timer();
}
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);
}
class TimeDisplayTimerTask extends TimerTask
{
#Override
public void run()
{
gps = new GPSTracker(getApplicationContext());
mHandler.post(new Runnable()
{
#Override
public void run()
{
// check if GPS enabled
if(gps.canGetLocation())
{
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude + "\n\n"+getDateTime(), Toast.LENGTH_LONG).show();
}
else
{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
}
});
}
}
public int onStartCommand(Intent intent, int flags, int startId)
{
Toast.makeText(this, "Service Started", Toast.LENGTH_SHORT).show();
return START_STICKY;
}
public void onDestroy()
{
super.onDestroy();
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_SHORT).show();
}
private String getDateTime()
{
// get date time in custom format
SimpleDateFormat sdf = new SimpleDateFormat("[yyyy/MM/dd - HH:mm:ss]");
return sdf.format(new Date());
}
}
When toast displayed, the longitude and latitude still 0.0, anyone can help me please?
Gratia

Replace your TimeDisplayTimerTask with following code:
Initialize gps within run method.
class TimeDisplayTimerTask extends TimerTask
{
#Override
public void run()
{
mHandler.post(new Runnable()
{
#Override
public void run()
{
gps = new GPSTracker(getApplicationContext());
// check if GPS enabled
if(gps.canGetLocation())
{
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude + "\n\n"+getDateTime(), Toast.LENGTH_LONG).show();
}
else
{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
}
});
}
}
Wait sometime because getting gps-coordinates from gps takes some time.

run app in background android

i build app for location manager.i have a one method which give me lattitute and longitude.
Here are my class and activity.
GPStracker.java
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
private final Handler _handler = new Handler();
private static int DATA_INTERVAL = 1 * 60 * 1000;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
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;
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;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* #return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
#Override
public void onLocationChanged(Location location) {
}
public void notifyUser() {
NotificationManager notificationManager = (NotificationManager)this.getSystemService(Context.NOTIFICATION_SERVICE);
Intent intent = new Intent(GPSTracker.this, AndroidGPSTrackingActivity.class);
//use the flag FLAG_UPDATE_CURRENT to override any notification already there
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
Notification notification = new Notification(R.drawable.ic_launcher, "Some Text", System.currentTimeMillis());
notification.flags = Notification.FLAG_AUTO_CANCEL | Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND;
notification.setLatestEventInfo(this, "", "", contentIntent);
//10 is a random number I chose to act as the id for this notification
notificationManager.notify(10, notification);
}
#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;
}
}
AndroidGPSTrackingActivity.java
public class AndroidGPSTrackingActivity extends Activity {
Button btnShowLocation;
Geocoder geocoder;
List<Address> addresses;
private final Handler _handler = new Handler();
private static int DATA_INTERVAL = 1 * 60 * 1000;
// GPSTracker class
GPSTracker gps;
double longitude;
double latitude;
String address,city,state,country,postalCode,knownName,city2;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
geocoder = new Geocoder(this, Locale.getDefault());
location();
btnShowLocation = (Button) findViewById(R.id.btnShowLocation);
// show location button click event
btnShowLocation.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// create class object
location();
}
});
}
public void location(){
gps = new GPSTracker(AndroidGPSTrackingActivity.this);
// check if GPS enabled
if(gps.canGetLocation()){
latitude = gps.getLatitude();
longitude = gps.getLongitude();
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1);
Log.d("adddd", String.valueOf(addresses));
address = addresses.get(0).getAddressLine(0);
city = addresses.get(0).getAddressLine(1);
state = addresses.get(0).getAddressLine(2);
} catch (IOException e) {
e.printStackTrace();
}
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude + address + "\n"
+city +" "+ state
, Toast.LENGTH_LONG).show();
_handler.postDelayed(getData, DATA_INTERVAL);
}else{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
}
public void notifyUser() {
NotificationManager notificationManager = (NotificationManager)this.getSystemService(Context.NOTIFICATION_SERVICE);
Intent intent = new Intent(AndroidGPSTrackingActivity.this, AndroidGPSTrackingActivity.class);
//use the flag FLAG_UPDATE_CURRENT to override any notification already there
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
Notification notification = new Notification(R.drawable.ic_launcher, "Some Text", System.currentTimeMillis());
notification.flags = Notification.FLAG_AUTO_CANCEL | Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND;
notification.setLatestEventInfo(this, city, state, contentIntent);
//10 is a random number I chose to act as the id for this notification
notificationManager.notify(10, notification);
}
private final Runnable getData = new Runnable()
{
#Override
public void run()
{
location();
notifyUser();
}
};
}
it gives me location from lattitute and longitute.
but when i terminate the app from recent app it does't work.
how to continue this (location()) method in background even if i terminate the app.
please help me.
Thanks in advance

you can build remote service to get location info,remote service do not belong your app,it will not be terminated even your app is killed. you can bind remote service to get location info.

how to run locationlistener in background

I would like to run a locationlistener on my app, that send after every 10m or every 5 seconds an new "Popup". Later I will send my data to the cloud.
This is my GPSTracker class:
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
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.provider.Settings;
import android.util.Log;
import android.widget.Toast;
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 5 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
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;
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;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* #return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
#Override
public void onLocationChanged(Location location) {
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText(GPSTracker.this,"Provider enabled by the user. GPS turned on",Toast.LENGTH_LONG).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
}
For my activityclass I have made this:
gps = new GPSTracker(MainActivity.this);
double latitude2 = gps.getLatitude();
double longitude2 = gps.getLongitude();
I receive the data, this works. But now I want to run the data in the background so when the location is changed I can implement a function that sends my data to the cloud.
I tried this:
private void startGPSTrackerInBackground() {
new AsyncTask<Void,Void,String>() {
#Override
protected String doInBackground(Void... params) {
String msg = "This message runs in background";
gps = new GPSTracker(MainActivity.this);
if(!gps.canGetLocation()){
gps.showSettingsAlert();
}else{
gps = new GPSTracker(MainActivity.this);
double latitude2 = gps.getLatitude();
double longitude2 = gps.getLongitude();
}
return msg;
}
#Override
protected void onPostExecute(String msg) {
mDisplay.append(msg + "\n");
}
}.execute(null, null, null);
}
But in this function it's not possible to get the information of my GPSTracker class, anyone an idea to make this possible?

Create an independent class, add a GPSTracker member variable and pass it in the constructor. Wrap your task in a method you can invoke later:
public class BackgroundGPSTracker() {
GPSTracker tracker;
public BackgroundGPSTracker(GPSTracker tracker) {
this.tracker = tracker;
}
public void run() {
new AsyncTask<Void,Void,String>() {
#Override
protected String doInBackground(Void... params) {
// Do some background stuff.
}
#Override
protected void onPostExecute(String msg) {
// Do after work stuff
}
}.execute(null, null, null);
}
}
Use:
If you create GPSTracker like this:
gps = new GPSTracker(MainActivity.this);
Then you start the activity passing it to the task:
BackgroundGPSTracker bgGPSTracker= new BackgroundGPSTracker(gps);
bgGPSTracker.run();
EDIT
Use a member variable to store last known location, and timer to schedule updates:
public class CampaignsDiscoverActivity extends Activity{
static final int QUERY_CAMPAINGS_DELAY = 30000;// milliseconds
Location currentLocation;
Timer timer;
void restartTimer() {
timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
sendDataToServerOrWhatever();
}
}, QUERY_CAMPAINGS_DELAY, QUERY_CAMPAINGS_DELAY);
}
void stopTimer() {
if (timer != null) {
timer.cancel();
timer = null;
}
}
void sendDataToServerOrWhatever() {
// Do some stuff using currentLocation
}
Set a listener for locations changes. when location changed is raised, stop the timer, do work and restart it:
void startGPSUpdates() {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onLocationChanged(Location location) {
stopTimer();
currentLocation = location;
sendDataToServerOrWhatever();
}
};
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
// Initialize location.
currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (currentLocation == null) {
currentLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
restartTimer();
}
To start the system just invoke startGPSUpdates.
You should pause listeners when app goes to the background and resume when foreground:
#Override
public void onPause() {
super.onPause();
if (applicationData.isLoggedIn()) {
pauseLocationUpdates();
}
}
#Override
public void onResume() {
super.onResume();
if (applicationData.isLoggedIn()) {
resumeLocationUpdates();
}
}
void pauseLocationUpdates() {
locationManager.removeUpdates(locationListener);
}
void resumeLocationUpdates() {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
I think you should do the same with the timer, but the app where I'm using it is not finished and fully tested yet, so you might find bugs.
Hope that helps.