Geofence Notification with Push Kit
Hello everyone,
In this article, I will talk about how we can use together Geofence and Push Kit. When the device enters a set location, we will send a notification to the user using Push Kit.
Geofence : It is an important feature in the Location Kit. Geofence is actually used to draw a geographic virtual boundary. For detailed information about geofence, you can check this article.
Push Kit : Push kit is essentially a messaging service. There are two different message types. These are notification and data messages. We will use the notification messages in this article.
To use Geofence and Push kit services, you must first integrate the necessary kits into your project. You can use the document in the link to easily integrate the Location and Push kit into your project.
After the HMS Core integration is finished, we need to add permissions to the AndroidManifest.xml file in order to access the user’s location and internet.
To send a notification to the device using a push kit, firstly the device must receive a push token.
We have received a push token, now we need to reach the access token, and we will do this through the service. We will obtain access token through the service, you must also complete the Retrofit implementations. Add Retrofit libraries app level build.gradle
In order to send access token, first we should prepare our request. This request should have grant_type ,client_id ,client_secret and will return AccessToken. Then, we will use this AccessToken for out further requests.
Now let’s handle the method by which we will obtain the access token. We need a Base URL to use in this method. The variable defined as OAUTH_BASE_URL represents our base URL. Do not forget to fill in client_credentials, YOUR_CLIENT_ID, YOUR_CLIENT_SECRET parts according to your project. This getAccessToken() was created using Synchronous Call. You can do this with Asynchronous Call according to the needs of your own project.
After obtaining the access token, we create an interface to send a notification with the push kit. Do not forget to fill the {YOUR_APP_ID} part of your project app ID.
We have set up the push kit to send notifications, now let’s see how we will send these notifications for geofence. First we create a broadcast receiver for geofence.
When the Broadcast Receiver is triggered, our geofence notifications will be sent through this class. You can see the accessToken and sendNotification methods we use for push kit in this class.
Then we add the methods we use to create a geofence list. In this project, I have defined geofences as static. You can adjust these geofence information according to the needs of your application. For example, if your location information is kept in the database, you can use geofence locations from the database. When adding geofences in the completeGeofenceList method, pay attention to the unique id part. If you try to add geofences with the same ids, you will get an error.
Sample application outputs for the use of push kit with geofence are as follows;
By using the push kit features, you can personalize your notifications according to the needs of your application. In this article I explained how to use the Push kit for Geofence notifications. I hope you will like it. Thank you for reading. If you have any questions, you can leave a comment or ask via Huawei Developer Forum.
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