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About Kotlin #3410

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22 changes: 22 additions & 0 deletions packages/firebase_messaging/README.md
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Expand Up @@ -98,6 +98,28 @@ By default background messaging is not enabled. To handle messages in the backgr
}
```

1. If you create project with Kotlin, add an `Application.kt` class to your app in the same directory as your `MainActivity.kt`. This is typically found in `<app-name>/android/app/src/main/kotlin/<app-organization-path>/`.

```kotlin
package io.flutter.plugins.firebasemessagingexample

import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService

class Application : FlutterApplication(), PluginRegistrantCallback {
override fun onCreate() {
super.onCreate()
FlutterFirebaseMessagingService.setPluginRegistrant(this)
}

override fun registerWith(registry: PluginRegistry?) {
io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin.registerWith(registry?.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
}
}
```

1. In `Application.java`, make sure to change `package io.flutter.plugins.firebasemessagingexample;` to your package's identifier. Your package's identifier should be something like `com.domain.myapplication`.

```java
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