I tried to get gps data (speed) when I don't use the app i'm programming.
but always when I close the app it stops asking for gps updates. now I got told, that I have to use a service. so i did, but it still stops asking for updates everytime I close to ui of the app.
here is my code of the service:
package com.example.slartibartfast.kslordered;
public class BackroundService extends Service {
private static float speed;
//initializing the Location Manager and Listener
LocationManager locationManager;
LocationListener locationListener;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#SuppressLint("MissingPermission")
#Override
public void onCreate() {
//Instantiating the device manager an listener
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
locationListener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
//when the location changed
Log.d("Location", ""+location);
Log.d("Float Location", ""+ location.getLongitude() + " " + location.getLatitude());
Log.d("Speed", " "+location.getSpeed());
//initializing the variable speed with the speed number given by the LocationListener
speed = location.getSpeed();
//creating a broadcast reciever
Intent intent = new Intent("speed_update");
intent.putExtra("speed", speed);
//sending speed to main activity
sendBroadcast(intent);
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
//if gps is disabled, this opens the gps settings
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
};
locationManager.requestLocationUpdates("gps", 5000, 0, locationListener);
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
return START_STICKY;
}
}
and here of my main activity:
package com.example.slartibartfast.kslordered;
public class MainActivity extends AppCompatActivity {
//initializing ui elements
TextView textviewSpeed;
Button button;
//initializing ui BroadcastReciever
private BroadcastReceiver broadcastReceiver;
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//instantiating the ui elements
textviewSpeed = (TextView)findViewById(R.id.textview_speed);
//checking if permission to use gps location is given
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION}, 10);
return;
}else{
}
startService(new Intent(this, BackroundService.class));
}
#Override
protected void onResume() {
super.onResume();
//broadcast reciever gets speed from the backround service
if (broadcastReceiver == null){
broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
//speed get's set on the textview
textviewSpeed.setText(""+ intent.getExtras().get("speed"));
}
};
}
registerReceiver(broadcastReceiver, new IntentFilter("speed_update"));
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
//asks for the gps user permission
switch (requestCode){
case 10:
if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//(5000);
}
}
}
I think you need to add your code on OnStart instead of OnCreate
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
locationListener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
//when the location changed
Log.d("Location", ""+location);
Log.d("Float Location", ""+ location.getLongitude() + " " + location.getLatitude());
Log.d("Speed", " "+location.getSpeed());
//initializing the variable speed with the speed number given by the LocationListener
speed = location.getSpeed();
//creating a broadcast reciever
Intent intent = new Intent("speed_update");
intent.putExtra("speed", speed);
//sending speed to main activity
sendBroadcast(intent);
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
//if gps is disabled, this opens the gps settings
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
};
locationManager.requestLocationUpdates("gps", 5000, 0, locationListener);
return START_STICKY;
}
Related
My application contains 6 separated activities, one of them returns GPS coordination, this activity work perfectly when it's open but first I return to the main activity it stops updating location.
details :
I have created a GPS services and called it in the Manifest.xml
<service android:name=".Services.GPS_Service" />
This is the Service :
public class GPS_Service extends Service {
private LocationListener listener;
private LocationManager locationManager;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#SuppressLint("MissingPermission")
#Override
public void onCreate() {
listener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
Intent i = new Intent("location_update");
i.putExtra("Longitude", location.getLongitude());
i.putExtra("Latitude", location.getLatitude());
final Date date = new Date(location.getTime());
final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
i.putExtra("time", sdf.format(date));
sendBroadcast(i);
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
}
};
locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
//noinspection MissingPermission
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 0, listener);
}
#SuppressLint("MissingPermission")
#Override
public void onDestroy() {
super.onDestroy();
if (locationManager != null) {
//noinspection MissingPermission
locationManager.removeUpdates(listener);
}
}
}
According to your answers and the phrasing you use: "when it's open but first I return to the main activity" - I am assuming by 'I return to the main activity' you mean that either onBackPressed is involved, or just a simple finish() was called. For that reason, onDestroy was called so your listener gets cancelled, and that why it stops working.
You cannot have two activities active at the same time. You must use Android Service to update location.
I have a location service which sends location to my server after every 3 minutes.This location service is started from Activity by click of a button.I want this service stops automatically after 6 hours from started time.Here is my service file.Service is starting normally and i am able to stop it by click of a button in activity.But i want to stop it automatically after 6 hours even app is minimized.Any help would be highly appreciated.
public class LocationService extends Service {
private LocationListener listener;
private LocationManager locationManager;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
listener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
Log.i("location:","location is "+location.getLongitude()+" "+location.getLatitude());
LocationApi.sendGpsLocation(getApplicationContext(),location.getLongitude(),location.getLatitude());
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String provider) {
Log.e("disabled provider is :","location is "+provider);
Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
}
};
// locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
if (ContextCompat.checkSelfPermission(DashboardActivity.activity, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED ) {
locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,3000,0,listener);
}
}
/* #Override
public final void stopSelf(){
}*/
#Override
public boolean onUnbind(Intent intent) {
LocationApi.stopLocation(getApplicationContext());
//super.onDestroy();
if (locationManager != null) {
//noinspection MissingPermission
locationManager.removeUpdates(listener);
}
return super.onUnbind(intent);
}
#Override
public void onDestroy() {
LocationApi.stopLocation(getApplicationContext());
super.onDestroy();
if(locationManager != null){
//noinspection MissingPermission
locationManager.removeUpdates(listener);
}
}
}
and i start this service in Activity by below code.
Intent i = new Intent(getApplicationContext(), LocationService.class);
if (Build.VERSION.SDK_INT >= 26) {
startForegroundService(i);
}else{
startService(i);
}
You can add a counter to your 3 min timer and count up til you reach 120 and than stop Locationupdates and shutdown the service.
You could schedule an alarm via AlarmManager when the service gets started - this will be an Intent you receive. When receiving you can stop your running service.
Try this code:
public class LocationService extends Service {
public static final String ACTION_STOP = "com.mycompany.myapp.SERVICE_STOP";
/*private static final long UPDATE_INTERVAL = 3 * 60 * 1000;
private static final long STOP_INTERVAL = 6 * 3600 * 1000;*/
private static final long UPDATE_INTERVAL = 3 * 1000;
private static final long STOP_INTERVAL = 20 * 1000;
private LocationListener listener;
private LocationManager locationManager;
private BroadcastReceiver receiver;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public int onStartCommand(Intent i, int flags, int startId){
if (Build.VERSION.SDK_INT >= 26){
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
NotificationChannel channel = new NotificationChannel("Location",
"Location", NotificationManager.IMPORTANCE_DEFAULT);
notificationManager.createNotificationChannel(channel);
Notification notif = new NotificationCompat.Builder(this, "Location")
.setContentTitle("Location service")
.build();
startForeground(3001, notif);
}
return START_STICKY;
}
#Override
public void onCreate() {
listener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
Log.i("location:","location is "+location.getLongitude()+" "+location.getLatitude());
LocationApi.sendGpsLocation(getApplicationContext(),location.getLongitude(),location.getLatitude());
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String provider) {
Log.e("disabled provider is :","location is "+provider);
Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
}
};
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED ) {
locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,UPDATE_INTERVAL,0,listener);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,UPDATE_INTERVAL,0f,listener);
}
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent i = new Intent(ACTION_STOP);
PendingIntent pi = PendingIntent.getBroadcast(this, 100, i, PendingIntent.FLAG_UPDATE_CURRENT);
am.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() + STOP_INTERVAL, pi);
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
stopSelf();
}
};
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_STOP);
registerReceiver(receiver, filter);
}
#Override
public void onDestroy() {
Log.i("location:","stopping updates");
unregisterReceiver(receiver);
LocationApi.stopLocation(getApplicationContext());
super.onDestroy();
if(locationManager != null){
locationManager.removeUpdates(listener);
}
}
}
Explanation: use AlarmManager.set() to schedule a broadcast after certain time (STOP_INTERVAL). To receive the broadcast, register a receiver in onCreate(), and unregister it in onDestroy().
I'm starting a GPS location service on several devices, the service works correctly in devices with Android Version <= 7 even when the power button is pressed and in the lockscreen status, but I tried in a Nokia 3 with Android 8.0.0 and the service stops after push the power button but it doesn't stop when the device locks by itself after some time. When I push the power button and unlock the device the service starts to send the GPS data again. This is my code:
public class GPS_Service extends Service {
private static final String TAG = GPS_Service.class.getName();
private static final int minTimeSecondsSamplingRate = AppConfig.GPS_MIN_TIME;
private static final int minDistMetersSamplingRate = AppConfig.GPS_MIN_DISTANCE;
private LocationManager locationManager;
private LocationListener locationListener;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#SuppressLint("MissingPermission")
#Override
public void onCreate() {
locationListener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
Log.d(TAG, "Location changed");
Intent intentSendToMainActivity = new Intent(AppConfig.C_STR_INTENT_FILTER_LOCATION_CHANGED);
intentSendToMainActivity.putExtra(AppConfig.C_STR_LATITUDE, location.getLatitude());
intentSendToMainActivity.putExtra(AppConfig.C_STR_LONGITUDE, location.getLongitude());
sendBroadcast(intentSendToMainActivity);
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onProviderDisabled(String provider) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
};
locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
if (locationManager != null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minTimeSecondsSamplingRate, minDistMetersSamplingRate, locationListener);
Log.i(TAG, "Starting Location Service");
} else {
Log.e(TAG, "Can't Start Location Service");
}
}
#Override
public void onDestroy() {
super.onDestroy();
if (locationManager != null) {
locationManager.removeUpdates(locationListener);
}
}
}
I've tried dissabling the battery optimization for my application but the problem persists
stop/start location update if no location is received in 2 minutes
also create a service an make it foreground and put location updates methods inside it
all the best
I have implemented Google Location Services inside a service, so that I can get location updates in the background (so that updates don't stop when user locks screen, switches fragment, etc.). But I am getting a strange error message that is stopping me from implementing it.
On the line:
"LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);"
It is telling me that 2rd parameter 'this' is not allowed and should be cast to (com.google.android.gms.location.LocationListener). But in every example I've seen this is not the case. When I do cast it, it does not work
Below is my code, trouble is in the onConnected method
public class LocationTrackingService extends Service implements LocationListener, ConnectionCallbacks, OnConnectionFailedListener {
GoogleApiClient googleApiClient = null;
LocationRequest locationRequest;
Location currentLocation;
static final int INTERVAL = 2000;
static final int FASTEST_INTERVAL = 500;
static final int PRIORITY = LocationRequest.PRIORITY_HIGH_ACCURACY;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
setupGoogleApiClient();
createLocationRequest(INTERVAL, FASTEST_INTERVAL, PRIORITY);
googleApiClient.connect();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (!googleApiClient.isConnected()) {
googleApiClient.connect();
}
return super.onStartCommand(intent, flags, startId);
}
#Override
public void onDestroy() {
//TODO maybe dont need this
googleApiClient.disconnect();
super.onDestroy();
}
#Override
public void onLocationChanged(Location location) {
//updating current location
currentLocation = location;
//TODO will be writing directly to database here
//broadcasting intent
Intent publishLocationUpdate = new Intent("location_update");
publishLocationUpdate.putExtra("current_location", currentLocation);
sendBroadcast(publishLocationUpdate);
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
//if location tracking is not enabled
#Override
public void onProviderDisabled(String s) {
Intent toSettings = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
toSettings.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(toSettings);
}
#Override
public void onConnected(#Nullable Bundle bundle) {
//sets location to last known location
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;
}
currentLocation = FusedLocationApi.getLastLocation(googleApiClient);
//request updates
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}
// Create an instance of GoogleAPIClient which we call to recieve location information
void setupGoogleApiClient(){
if (googleApiClient == null) {
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
}
//set request settings, interval: how soon until new request is made, priority affects batterylife (using GPS, netowork, data...)
void createLocationRequest(int interval, int fastestInterval, int priority) {
locationRequest = new LocationRequest();
locationRequest.setInterval(interval);
locationRequest.setFastestInterval(fastestInterval);
locationRequest.setPriority(priority);
//can also use PRIORITY_LOW_POWER, PRIORITY_BALANACED_POWER_ACCURACY, PRIORITY_NO_POWER
}
}
I check the intent in onResume in my fragment, code below:
if(broadcastReceiver == null){
broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
Location currentLocation;
currentLocation = (Location) intent.getExtras().get("current_location");
currentAltitudeTextView.setText(String.valueOf(currentLocation.getLatitude()));
currentSpeedTextView.setText(String.valueOf(currentLocation.getLongitude()));
}
};
}
context.registerReceiver(broadcastReceiver, new IntentFilter("location_update"));
i'm currently writing an app that should to the following:
The UI only contains one toggle button. If it is turned on the GPS Position shall be sent to an external server. If it is turned off, nothing shall happen.
If the Button was turned on and the app (activity) is closed the location should still be send until the Button is turned off again.
How can i achieve this ? I read a lot of threads and tutorials and on dev.google.com, but i was not able to find the best solution for my problem.
My current approach:
MainActivity.java
public void onClick(View v) {
if (onOffButton.isChecked()) {
Intent startIntent = new Intent(this, LocationService.class);
startService(startIntent);
} else {
stopService(new Intent(this, LocationService.class));
}
}
LocationService.java
public class LocationService extends Service implements LocationListener {
final public static String START_ACTION = "START_LOCATION";
final public static int NOTE_ID = 1;
private int updateRate;
private LocationManager locationManager;
private NotificationManager notifyManager;
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
// show popup message
Toast.makeText(this, getText(R.string.start_message), Toast.LENGTH_SHORT).show();
// display icon in status bar
requestLocationUpdates();
}
private void requestLocationUpdates() {
if(locationManager != null)
locationManager.removeUpdates(this);
// get location service
Criteria crit = new Criteria();
crit.setPowerRequirement(Criteria.ACCURACY_FINE);
String bestProvider = getLocationManager().getBestProvider(crit, true);
getLocationManager().requestLocationUpdates(bestProvider, updateRate * 1000,
0 /* minDist */, this);
LocationService.running = true;
}
#Override
public void onDestroy() {
super.onDestroy();
getLocationManager().removeUpdates(this);
notifyManager.cancel(NOTE_ID);
Toast.makeText(this, getText(R.string.stop_message), Toast.LENGTH_SHORT).show();
LocationService.running = false;
}
#Override
public void onLocationChanged(Location location) {
//Send Location to Server
}
#Override
public void onProviderDisabled(String provider) {
// TODO stop service, notify user
}
#Override
public void onProviderEnabled(String provider) {
requestLocationUpdates();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO notify user
}
private LocationManager getLocationManager() {
if (this.locationManager == null)
this.locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
return this.locationManager;
}
}
I got this from a very old gps tracker i found on the Internet (i know that onStart() is deprecated and should replaced with onCommandStart()) I just want to know if the general approach is good..
Regards.
The approach looks fine. You just need to implement the call-back methods to report your location.