{"id":24556,"date":"2015-07-31T11:12:33","date_gmt":"2015-07-31T05:42:33","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=24556"},"modified":"2015-07-31T11:12:33","modified_gmt":"2015-07-31T05:42:33","slug":"push-notification-in-android-using-grails","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/push-notification-in-android-using-grails\/","title":{"rendered":"Push Notification in Android Using Grails"},"content":{"rendered":"

Hi All,<\/p>\n

I had a use case where I need to send the push notification to Android Device using Grails Application.<\/p>\n

For sending push notification I have used the Android GCM<\/strong> plugin.<\/p>\n

So, before going further we should know what is push notification and how it works.<\/p>\n

Push Notification <\/strong> : It is a message or events delivered by a centralized server to an endpoint device even when the user is not actively using your application.<\/p>\n

How it Works <\/strong> :<\/p>\n

    \n
  1. We need to create an application in Google Play Developer console<\/strong> , after creating the application it will provide us with a key through which our application will send the notification to GCM server.<\/li>\n
  2. Then we need to install ANDROID app on our device which will sends sender ID and application ID to GCM server for registration(Generally done by Android Developer).<\/li>\n
  3. Upon successful registration GCM server issues registration ID to Android device.<\/li>\n
  4. After receiving registration ID, the device will send the registration ID to our server.<\/li>\n
  5. Our server will store the registration ID in the database for later usage.<\/li>\n
  6. Whenever a push notification is needed, our server sends a message to GCM server along with the device registration ID (which has been stored earlier in the database).<\/li>\n
  7. After sending the push notification to the GCM server then it is the responsibilty of GCM server to send the push notification to the desired device using registration ID.<\/li>\n<\/ol>\n

    \"Android<\/p>\n

    Let\u2019s start by taking an example.<\/strong><\/p>\n

    In order to use the plugin we must include in BuildConfig.groovy<\/p>\n

    [java]compile ":android-gcm:0.2"[\/java]<\/p>\n

    and we can also keep GCM key in Config.groovy<\/p>\n

    For sending push notification we have to use androidGcmService provided by the plugin and it gives us different methods for sending push notification, in my case I have used sendMessage(Map data, List registrationIds, String collapseKey, String apiKey).<\/p>\n

    BirthdayReminderJob<\/span><\/p>\n

    [java]
    \nclass BirthdayReminderJob {<\/p>\n

    def userService
    \n def googleCloudMessagingService<\/p>\n

    static triggers = {
    \n cron name: ‘birthdayReminder’, cronExpression: "0 20 5 1\/1 * ? *"
    \n }<\/p>\n

    def execute() {
    \n List<User> birthdayUserList = userService.birthdayList()
    \n if (birthdayUserList) {
    \n googleCloudMessagingService.sendPushNotification(birthdayUserList)
    \n }
    \n }
    \n}
    \n[\/java]<\/p>\n

    GoogleCloudMessagingService<\/span><\/p>\n

    [java]
    \nclass GoogleCloudMessagingService {<\/p>\n

    def androidGcmService
    \n def mobileAppUserService
    \n def grailsApplication
    \n def mobileUtilService<\/p>\n

    void sendPushNotification(List<User> birthdayList) {
    \n List<String> tokenList = mobileAppUserService.getTokenList(MobilePlatform.ANDROID)
    \n Map birthDayMap = mobileUtilService.getNotification(birthdayList, tokenList)
    \n if (birthDayMap) {
    \n Map response = ["response": JsonOutput.toJson(birthDayMap)]
    \n sendPushNotificationToAndroidUser(response, tokenList)
    \n }
    \n }<\/p>\n

    void sendPushNotificationToAndroidUser(Map response, List<String> tokenList) {
    \n sendMulticastInstantMessage(response, tokenList)
    \n }<\/p>\n

    void sendMulticastInstantMessage(Map response, List<String> registrationIds, String apiKey = apiKeyFromConfig()) {
    \n androidGcmService.sendMessage(response, registrationIds, ”, apiKey)
    \n }<\/p>\n

    String apiKeyFromConfig() {
    \n return grailsApplication.config.android.gcm.api.key
    \n }
    \n}<\/p>\n

    [\/java]<\/p>\n

    Hope this helps !! \ud83d\ude42 \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"

    Hi All, I had a use case where I need to send the push notification to Android Device using Grails Application. For sending push notification I have used the Android GCM plugin. So, before going further we should know what is push notification and how it works. Push Notification : It is a message or […]<\/p>\n","protected":false},"author":96,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":7},"categories":[518,7,1],"tags":[4845,2084,4840,4844,2078],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/24556"}],"collection":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/users\/96"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/comments?post=24556"}],"version-history":[{"count":0,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/24556\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/media?parent=24556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/categories?post=24556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/tags?post=24556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}