# Push notifications

***

**Add configuration file**\
Create a project via the Firebase console, and download the google-services.json and move it into the app's modules (app level) directory

**Apply gradle plugin**\
a、If your project doesn't have dependencyResolutionManagement in your settings.gradle, add the following to your top-level build.gradle at the end of repositories：

**top-level build.gradle**

```kotlin
allprojects {
  repositories {
    ...
    // Check that you have the following line (if not, add it):
    google()  // Google's Maven repository
  }
}
```

Otherwise add the following to your settings.gradle in repositories of dependencyResolutionManagement section：

**settings.gradle**

```kotlin
dependencyResolutionManagement {
    repositories {
        ...
        // Check that you have the following line (if not, add it):
    		google()  // Google's Maven repository
    }
}
```

b、 add the following to your top-level build.gradle

**top-level build.gradle**

```kotlin
buildscript {
  repositories {
    // Check that you have the following line (if not, add it):
    google()  // Google's Maven repository
  }

  dependencies {
    // Add the following line:
    classpath 'com.google.gms:google-services:4.3.10'  // Google Services plugin
  }
}
```

c、In your module (app-level) Gradle file (usually app/build.gradle), apply the Google Services Gradle plugin:

**app-level build.gradle**

```kotlin
apply plugin: 'com.android.application'
// Add the following line:
apply plugin: 'com.google.gms.google-services'  // Google Services plugin

android {
  // ...
  // add the firebase dependency
  implementation platform('com.google.firebase:firebase-bom:29.0.3')
  implementation 'com.google.firebase:firebase-analytics'
  implementation 'com.google.firebase:firebase-messaging'  
}
```

notification message\
To get push messages, you have to call method:

```kotlin
Appflow.setListener(listener: FirebaseMsgListener)
```

**Example**

```kotlin
Appflow.setFirebaseMsgListener(object : Appflow.FirebaseMsgListener {
    override fun onNewToken(token: String) {
				//When the Firebase token is updated, it will be called back through this method
    }

    override fun onMessageReceived(remoteMessage: RemoteMessage) {
      	//When the App is in the background, when a push notification message is received, 
        //a notification will pop up directly in the system bar.
      	//When the App is in the foreground, a push notification is received, 
        //and the message is called back through this method.
        remoteMessage.notification?.let {
            Log.d(TAG,"Title:${it.title} Body: ${it.body}")
        }
    }
})
```

**API Reference**

| FirebaseMsgListener                             |                                                                                                                   |
| ----------------------------------------------- | ----------------------------------------------------------------------------------------------------------------- |
| onNewToken(token: String)                       | When the Firebase token is updated, it will be called back through this method                                    |
| onMessageReceived(remoteMessage: RemoteMessage) | Push notification message callback (when the App is in the foreground, the push notification will be called back) |


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