How to detect if user turned off Location in Settings?

Question

I want to detect if the user turned off the location at runtime. I can check if he turns it on or if the location was turned off by user before the app was started but I can't check if he turned it off after.

Code Sample: MapEntity extends LocationListener

class MapViewer(a: MainActivity, parentView: ViewGroup) : MapEntity(a, parentView) {

    override fun onProviderEnabled(provider: String?) {
        activity.hideGpsSnackbar()
    }

    override fun onProviderDisabled(provider: String?) {
        activity.showGpsSnackbar()
    }

}

For realtime GPS location checking, I'm using GnssStatus.Callback()

UPDATE:

I've created BroadcastReceiver according to the answer below.

abstract class GPSReceiver : BroadcastReceiver() {

    override fun onReceive(context: Context, intent: Intent) {
        try {
           val locationManager = context.getSystemService(LOCATION_SERVICE) as LocationManager

             if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                    onGpsChanged(true)
                } else {
                    onGpsChanged(false)
                }
            } catch (ex: Exception) {
                App.log("IsGPSEnabled: $ex")
            }

        }

        abstract fun onGpsChanged(isEnabled: Boolean)
    }

Code inside one of my Activities:

private val gpsStatusReceiver = object : GPSReceiver() {

     override fun onGpsChanged(isEnabled: Boolean) {
         if (isEnabled){
             hideGpsSnackbar()
         } else {
             showGpsSnackbar()
         }
     }
}

override fun onStart() {
    super.onStart()
    registerReceiver(gpsStatusReceiver, IntentFilter())
}

override fun onStop() {
    super.onStop()
    unregisterReceiver(gpsStatusReceiver)
}

UPDATE

If you want to support Android 6.0, you cannot use abstract class. Because it will try to create object out of this class defined in AndroidManifest. Android 8.0+ will not check receiver inside AndroidManifest so you can instantiate object out of Abstract Class. So instead of it create interface.

Answer 1

I'm actually doing it with a BroadcastReceiver.

I can share my code; it's java but I think you can easily convert it into kotlin.

1. Create a Broadcastreceiver

Example:

public class GPSBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        try {
            LocationManager locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
            if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                //isGPSEnabled = true;
            } else {
                //isGPSEnabled = false;
            }
        }catch (Exception ex){
        }
    }
}

2. Add your BroadcastReceiver to the manifest

Example:

    <receiver android:name=".others.GPSBroadcastReceiver">
        <intent-filter>
            <action android:name="android.location.PROVIDERS_CHANGED" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

Then (for my case) I manage it in my ApplicationContext as follows:

private GPSBroadcastReceiver gpsBroadcastReceiver = new GPSBroadcastReceiver();

@Override
public void onCreate() {
    ....
    registerReceiver(gpsBroadcastReceiver, new IntentFilter());
}

@Override
public void onTerminate() {
    ...
    unregisterReceiver(gpsBroadcastReceiver);
}

That's just an example, there might be other ways for it but actually I'm fine with that one; good luck!

Edit:

try adding this permission in your manifest

<uses-permission android:name="android.permission.ACCESS_GPS" />

Edit: For Android 8.0+ register your BroadcastReceiver like this:

registerReceiver(gpsBroadcastReceiver,IntentFilter("android.location.PROVIDERS_CHANGED"))

Adding action inside AndroidManifest will not work.