[feat] adding basic geolocation

[Alystrasz]

Using geolocator package, the app receives a location every ~5 seconds (if the user consents + if geolocation is enabled on the phone).

[Alystrasz]

LocationOptions(accuracy: LocationAccuracy.best, timeInterval: 5000)
With this, we receive a location every few seconds, which might impact phone's battery: is it possible/reasonable to increase this interval?

[rouvoy]

I believe that we can live with one location retrieved every 1 or 2 minutes. Most of the visited places will be indoor places, so we can also rely on Google Play services to locate the phone with minimum battery consumption (by using alternative location technology), if available on Flutter.

[Alystrasz]

Geolocator package already uses Google Play services (at least on Android, the implementation being a FusedLocationProviderClient), so that should do it 😃
I'll increase the location timeout to 60 seconds.

[m3ftah]

The app has asked for location permission, there is no bug.
How can we test this feature?

[Alystrasz]

For now, the app requests a location every 60 seconds; each time a location is received, it is printed on the logs.

[m3ftah]

Nothing is printed on the log.
I am using a Simulator.

[m3ftah]

Have you tried to see if it works even if you close the app, or switch to another app on Android?

[Alystrasz]

I launched the app, switched to a browser, and it seems that it gathers locations while in background (tested on Android 6)

D/FlutterView(31752): Detaching from a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@6f59ceb 
I/flutter (31752): new location stored: {lat: 51.0286983, lng: 2.3703206, date: 2020-05-04 12:15:15.774Z}
I/flutter (31752): new location stored: {lat: 51.0286983, lng: 2.3703206, date: 2020-05-04 12:16:15.809Z}
I/flutter (31752): new location stored: {lat: 51.0286982, lng: 2.3703206, date: 2020-05-04 12:17:15.890Z}
I/flutter (31752): new location stored: {lat: 51.0286982, lng: 2.3703206, date: 2020-05-04 12:18:15.915Z}

[m3ftah]

Good, could you also check if this takes more than 15 minutes, as Android seems to idle apps if they are not on the foreground.

[Alystrasz]

What would we do if this takes more than 15 minutes?

[m3ftah]

You mean if it doesn't take more than 15 minutes?

[Alystrasz]

Well, the more locations we have, the most accurate our results will be.
Moreover, we can't force people to activate geolocation on their phones, so receiving a new location definitely might take more than 15 minutes 😄