尝试在Android中启动服务时出错

Question

I'm trying to write a service to locate the user by it's GPs location in Android. I wrotre a service for that. But alwasy when I try to start the service the error

android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? appears. I already searched for this problem on google and added the follwoing line to my sourcecode:

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

But the Error still appears. What can I do in order to make the service start without any errors? Here is my code: MainActivity.java:

public class MainActivity extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.start);

        //GPs Standort bestimmung starten
        Intent intent;
        intent = new Intent(this, Gps_Service.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startService(intent);

        initButtons();
    }
}

"Gps_service.java":

public class Gps_Service extends Service implements LocationListener{

    private double längengrad = 0.0, breitengrad = 0.0;
    LocationManager locationManager;
    Address adresse;
    String straße, Ort, Land;

    @Override 
    public void onCreate(){
        super.onCreate();
        locationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(locationManager.GPS_PROVIDER, 10000, 100, this);
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        locationManager.removeUpdates(this);
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    @Override
    public void onLocationChanged(Location location) {
        längengrad = location.getLongitude();
        breitengrad = location.getLatitude();
    }

    @Override
    public void onProviderDisabled(String provider) {

    }
    @Override
    public void onProviderEnabled(String provider) {}

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {}
}

Answer 1

Instead of running a service to retreive the user's location via GPS, use Google's Fused Location API .

The link provided has a detailed guide about how to implement it and is much more reliable and accurate in receiving location data.

Don't forget this gradle dependency as well:

compile 'com.google.android.gms:play-services-location:8.4.0'