Flutter Integrate OneSignal Push Notification

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First step: Get iOS cert (mobileprovision + .p12)

NOTE: iOS emulator can NOT get push notification

Config on website

• Login to https://console.firebase.google.com/
• Create a new project
• At Project Overview -> Go to Project settings -> Cloud Messaging
• Copy Server key and Sender ID which keys use to register on OneSignal
• Create new OneSignal account and go to https://app.onesignal.com/
• Select Settings ->
• Select “Google Android” -> Fill “Firebase Server Key” and “Firebase Sender Key” which get from the previous step on Firebase console -> Next to save and Leave Setup
• Select “Apple iOS” -> Select “Upload optional sandbox certificate” -> Upload “.p12” and Next to save and Leave Setup
• If all correct -> you will see the “ACTIVE” label

Config on Android app

• Goto https://console.firebase.google.com/
• Select Project Overview
• Press “+ Add app”
• Select Android => Fill “Android package name” -> Register app -> Download “google-services.json” and place that file to “android/app/google-services.json”
• Goto Flutter project
• Edit “android/app/build.gradle” -> Add below snip code at top (line 1)

buildscript {
    repositories {
        // ...
        maven { url 'https://plugins.gradle.org/m2/' } // Gradle Plugin Portal
    }
    dependencies {
        // ...
        // OneSignal-Gradle-Plugin
        classpath 'gradle.plugin.com.onesignal:onesignal-gradle-plugin:[0.12.1, 0.99.99]'
    }
}
apply plugin: 'com.onesignal.androidsdk.onesignal-gradle-plugin'

• Add plugin

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
apply plugin: 'com.google.gms.google-services'

• Edit “android/build.gradle”

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
    }
dependencies {…