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https://github.com/loup-v/geolocation

Flutter geolocation plugin for Android and iOS.
https://github.com/loup-v/geolocation

flutter flutter-plugin geocoder geolocation gps location

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Flutter geolocation plugin for Android and iOS.

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README 

        
# geolocation



[![pub package](https://img.shields.io/pub/v/geolocation.svg)](https://pub.dartlang.org/packages/geolocation)



Flutter [geolocation plugin](https://pub.dartlang.org/packages/geolocation/) for Android API 16+ and iOS 9+.



Features:



- Manual and automatic location permission management

- Current one-shot location

- Continuous location updates with foreground and background options



The plugin is under active development and the following features are planned soon:



- Geocode

- Geofences

- Place suggestions

- Activity recognition

- Exposition of iOS/Android specific APIs (like significant location updates on iOS)



|                                          Android                                           |                                          iOS                                           |

| :----------------------------------------------------------------------------------------: | :------------------------------------------------------------------------------------: |

| ![](https://github.com/loup-v/geolocation/blob/master/doc/android_screenshot.jpg?raw=true) | ![](https://github.com/loup-v/geolocation/blob/master/doc/ios_screenshot.jpg?raw=true) |



### Installation



Follow the instructions: https://pub.dev/packages/geolocation#-installing-tab-



#### iOS



##### Objective-C compatibility



For Flutter projects created with the Objective-C template, you might need to add `use_frameworks!` at the top of `ios/Podfile`.

More details can be found in the following issue: https://github.com/flutter/flutter/issues/16049#issuecomment-552060349



#### Android



##### AndroidX



Geolocation is dependent on AndroidX. Make sure to include the following settings to 'android/gradle.properties':



```

android.useAndroidX=true

android.enableJetifier=true

```



##### R8/Proguard code obfuscation



If you have enabled code obfuscation with R8 or proguard, you need to add the following rules.



`android/app/build.gradle`:



```groovy

buildTypes {

  release {

    minifyEnabled true

    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

  }

}

```



`android/app/proguard-rules.pro`:



```

# Geolocation - start



-keep class app.loup.geolocation.** { *; }



    # Moshi - start

    # https://github.com/square/moshi/blob/master/moshi/src/main/resources/META-INF/proguard/moshi.pro



    # JSR 305 annotations are for embedding nullability information.

    -dontwarn javax.annotation.**



    -keepclasseswithmembers class * {

        @com.squareup.moshi.* ;

    }



    -keep @com.squareup.moshi.JsonQualifier interface *



    # Enum field names are used by the integrated EnumJsonAdapter.

    # values() is synthesized by the Kotlin compiler and is used by EnumJsonAdapter indirectly

    # Annotate enums with @JsonClass(generateAdapter = false) to use them with Moshi.

    -keepclassmembers @com.squareup.moshi.JsonClass class * extends java.lang.Enum {

        ;

        **[] values();

    }



    # Moshi - end



# Geolocation - end

```



### Permission



Android and iOS require to declare the location permission in a configuration file.



#### For iOS



There are two kinds of location permission available in iOS: "when in use" and "always".



If you don't know what permission to choose for your usage, see:

https://developer.apple.com/documentation/corelocation/choosing_the_authorization_level_for_location_services



You need to declare the description for the desired permission in `ios/Runner/Info.plist`:



```xml



  

  NSLocationWhenInUseUsageDescription

  Reason why app needs location

  NSLocationAlwaysAndWhenInUseUsageDescription

  Reason why app needs location



  

  NSLocationAlwaysUsageDescription

  Reason why app needs location

  ...



```



#### For Android



There are two kinds of location permission in Android: "coarse" and "fine".

Coarse location will allow to get approximate location based on sensors like the Wifi, while fine location returns the most accurate location using GPS (in addition to coarse).



You need to declare one of the two permissions in `android/app/src/main/AndroidManifest.xml`:



```xml



  

  

  



```



Note that `ACCESS_FINE_LOCATION` permission includes `ACCESS_COARSE_LOCATION`.



## API



For more complete documentation on all usage, check the API documentation:  

https://pub.dartlang.org/documentation/geolocation/latest/geolocation/geolocation-library.html



You can also check the example project that showcase a comprehensive usage of Geolocation plugin.



### Check if location service is operational



API documentation: https://pub.dartlang.org/documentation/geolocation/latest/geolocation/Geolocation/isLocationOperational.html



```dart

final GeolocationResult result = await Geolocation.isLocationOperational();

if(result.isSuccessful) {

  // location service is enabled, and location permission is granted

} else {

  // location service is not enabled, restricted, or location permission is denied

}

```



### Request location permission



On Android (api 23+) and iOS, apps need to request location permission at runtime.



_Note: You are not required to request permission manually.

Geolocation plugin will request permission automatically if it's needed, when you make a location request._



API documentation: https://pub.dartlang.org/documentation/geolocation/latest/geolocation/Geolocation/requestLocationPermission.html



```dart

final GeolocationResult result = await Geolocation.requestLocationPermission(

  const LocationPermission(

    android: LocationPermissionAndroid.fine,

    ios: LocationPermissionIOS.always,

  ),

  openSettingsIfDenied: true,

);



if(result.isSuccessful) {

  // location permission is granted (or was already granted before making the request)

} else {

  // location permission is not granted

  // user might have denied, but it's also possible that location service is not enabled, restricted, and user never saw the permission request dialog. Check the result.error.type for details.

}

```



### Get the current one-shot location



Geolocation offers three methods:



- Last known location (best on Android):  

  https://pub.dartlang.org/documentation/geolocation/latest/geolocation/Geolocation/lastKnownLocation.html

- Single location update (best on iOS):  

  https://pub.dartlang.org/documentation/geolocation/latest/geolocation/Geolocation/singleLocationUpdate.html

- Current location (best of both worlds, tries to retrieve last known location on Android, otherwise requests a single location update):  

  https://pub.dartlang.org/documentation/geolocation/latest/geolocation/Geolocation/currentLocation.html



```dart

// get last known location, which is a future rather than a stream (best for android)

LocationResult result = await Geolocation.lastKnownLocation();



// force a single location update (best for ios)

StreamSubscription subscription = Geolocation.currentLocation(accuracy: LocationAccuracy.best).listen((result) {

  // todo with result

});



// best option for most cases

StreamSubscription subscription = Geolocation.currentLocation(accuracy: LocationAccuracy.best).listen((result) {

  if(result.isSuccessful) {

    Double latitude = result.location.latitude;

    // todo with result

  }

});

```



### Continuous location updates



API documentation: https://pub.dartlang.org/documentation/geolocation/latest/geolocation/Geolocation/locationUpdates.html



```dart

StreamSubscription subscription = Geolocation.locationUpdates(

    accuracy: LocationAccuracy.best,

    displacementFilter: 10.0, // in meters

    inBackground: true, // by default, location updates will pause when app is inactive (in background). Set to `true` to continue updates in background.

  )

  .listen((result) {

    if(result.isSuccessful) {

      // todo with result

    }

  });



// cancelling subscription will also stop the ongoing location request

subscription.cancel();

```



### Handle location result



Location request return either a `LocationResult` future or a stream of `LocationResult`.



API documentation: https://pub.dartlang.org/documentation/geolocation/latest/geolocation/LocationResult-class.html



```dart

LocationResult result = await Geolocation.lastKnownLocation();



if (result.isSuccessful) {

  // location request successful, location is guaranteed to not be null

  double lat = result.location.latitude;

  double lng = result.location.longitude;

} else {

  switch (result.error.type) {

    case GeolocationResultErrorType.runtime:

      // runtime error, check result.error.message

      break;

    case GeolocationResultErrorType.locationNotFound:

      // location request did not return any result

      break;

    case GeolocationResultErrorType.serviceDisabled:

      // location services disabled on device

      // might be that GPS is turned off, or parental control (android)

      break;

    case GeolocationResultErrorType.permissionNotGranted:

      // location has not been requested yet

      // app must request permission in order to access the location

      break;

    case GeolocationResultErrorType.permissionDenied:

      // user denied the location permission for the app

      // rejection is final on iOS, and can be on Android if user checks `don't ask again`

      // user will need to manually allow the app from the settings, see requestLocationPermission(openSettingsIfDenied: true)

      break;

    case GeolocationResultErrorType.playServicesUnavailable:

      // android only

      // result.error.additionalInfo contains more details on the play services error

      switch(result.error.additionalInfo as GeolocationAndroidPlayServices) {

        // do something, like showing a dialog inviting the user to install/update play services

        case GeolocationAndroidPlayServices.missing:

        case GeolocationAndroidPlayServices.updating:

        case GeolocationAndroidPlayServices.versionUpdateRequired:

        case GeolocationAndroidPlayServices.disabled:

        case GeolocationAndroidPlayServices.invalid:

      }

    break;

  }

}

```



## Authors



Geolocation plugin is developed by Loup, a mobile development studio based in Montreal and Paris.  

You can contact us at 



## Contributers



- lukaspili

- mit-mit

- shehabic-work

- Abgaryan

- shehabic

- alfanhui



## License



Apache License 2.0