如何检查用户是否真的在Android中启用了GPS定位？

Question

My application needs GPS, so when a specific operation is performed I check if the GPS is enabled as following (and as suggested by Marcus in this other question):

if (!locationManager.isProviderEnabled( LocationManager.GPS_PROVIDER )) {
    buildAlertMessageNoGps();
}

rootView = inflater.inflate(R.layout.fragment_alert, container, false);
[...]

The problem is that the user, from the location settings, could not enable the GPS (eg, by clicking on the "back" button and going back to the application). In this particular case, the fragment injects the layout for the corresponding process, but the GPS is still disabled. How to solve that?

Answer 1

I guess this is the method that you are looking for. You have to check for android version above KitKat.

@SuppressLint("InlinedApi") @SuppressWarnings("deprecation")
public static boolean isLocationEnabled(Context context) {
    int locationMode = 0;
    String locationProviders;

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){
        try {
            locationMode = Settings.Secure.getInt(context.getContentResolver(), Settings.Secure.LOCATION_MODE);

        } catch (SettingNotFoundException e) {
            e.printStackTrace();
        }

        return locationMode != Settings.Secure.LOCATION_MODE_OFF;

    }else{
        locationProviders =     Settings.Secure.getString(context.getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
        return !TextUtils.isEmpty(locationProviders);
    }
} 

Answer 2

I solved by replacing startActivity(...) with startActivityForResult(...) in the buildAlertMessageNoGps() method. In doing so, I can check again if the GPS has been enabled in the callback function onActivityResult(...) .