Getting periodic GPS location in an Android app

Question

I am working on a location aware application and I have come to a standstill. What I want to do is be able to ask the Android device for a single GPS location and return it.

So far this is what I have. A service that is supposed to update the location periodically:

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.Handler;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.widget.Toast;

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class KeepTime extends Service implements LocationListener {
float minAccuracyMeters = 20.0f;
LocationManager locationManager;
int index = 0;

int maxAmountOfTries = 5;
Timer timer;

boolean currentlyListening = false;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    System.out.println("Service started..");
    Toast.makeText(this, "Service started", Toast.LENGTH_SHORT).show();
    locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    if(!isLocationEnabled()){
        System.out.println("Location service is not active. Stopping self.");
        Toast.makeText(this, "Location service is not active. Stopping self.", Toast.LENGTH_SHORT).show();
        this.stopSelf();
        return 0;
    }

    timer = new Timer();
    timer.schedule(new TimerTask() {

        @Override
        public void run() {

            if (currentlyListening) {

            } else {
                setListener();
            }
        }
    }, 0, 1000 * 60 * 10);

    return Service.START_NOT_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();

    mll.removeListener();
    mll.cancelTimer();
    Toast.makeText(this, "Service Destroyed", Toast.LENGTH_SHORT).show();
    System.out.println("Service destroyed..");
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

private boolean isLocationEnabled() {

    return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) ||
            locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}

private void setListener()
{
    System.out.println("Set listener called..");
    try {
        System.out.println("About to set listeners");
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        System.out.println("Location listeners set..");
        currentlyListening = true;
    }catch(SecurityException e){
        System.out.println("Security exception. "+e);
    }
}

public void removeListener() {
    try {
        locationManager.removeUpdates(this);
        System.out.println("Removed updates..");
        currentlyListening = false;
    } catch (SecurityException se) {
        System.out.println("Security exception: " + se);
    }
}

@Override
public void onLocationChanged(Location location) {
    System.out.println("Location changed..");
    double longitudeNetwork = location.getLongitude();
    double latitudeNetwork = location.getLatitude();
    double accuracy = location.getAccuracy();

    if(accuracy < minAccuracyMeters || index > maxAmountOfTries) {
        System.out.println("Accuracy is less than " + minAccuracyMeters + " Recording..");
System.out.println(longitudeNetwork+ " "+latitudeNetwork+ " "+accuracy);

        removeListener();
    }
    else{
        System.out.println("Accuracy was not good enough. Still recorded location.");

    }
    index++;
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    System.out.println("Status changed");
}

@Override
public void onProviderEnabled(String provider) {
    System.out.println("Provider enabled.");
}

@Override
public void onProviderDisabled(String provider) {
    System.out.println("Provider disabled.");
}
}

Every 10 minutes I want the location to be printed out when it reaches a certain accuracy or after a certain amount of time. But it throws and exception. Here is the exception:

FATAL EXCEPTION: Timer-0
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

I have tried calling the prepare but it just causes more havoc. Any ideas how to achieve what I am after?

Possible duplicate of [Can't create handler inside thread that has not called Looper.prepare()](http://stackoverflow.com/questions/3875184/cant-create-handler-inside-thread-that-has-not-called-looper-prepare) — buczek, Apr 08 '16 at 15:17

score 1 · Answer 1 · edited May 23 '17 at 12:24

TimerTask works on different thread, so maybe your problem refers to this

And check this project, seems like it's mentioning about your whole idea perfectly

Edit

Instead of wasting time, i show the key materials for him. For the first link i already told it's key.

TimerTask works on different thread

You can do same thing as accepted answer in the link. So you must run your code scope in main thread because service works on main thread too.
Or you can use handler.postDelayed instead of TimerTask.

And i did not directly forward you to wasteful links, because i analyze your whole code. And it's refers to perfect project of commonsguy on github. So you can eliminate your mistakes by looking commonsguy project.

Instead of adding direct links for an answer, please copy the important points from the links and include the links for further reference. This will ensure if a post or site is taken down that users are still able to find your answer helpful. — buczek, Apr 08 '16 at 15:49

score 0 · Answer 2 · answered Apr 08 '16 at 17:25

0

the locationmanager.requestlocationupdates has a parameter for interval on when to get location again.. try pressing ctrl and hover your mouse on requestlocationupdate syntax.

answered Apr 08 '16 at 17:25

dione llorera

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Getting periodic GPS location in an Android app

2 Answers2