آموزش ساخت برنامه چت با Firebase Cloud Messaging

plugins {
    id 'com.google.gms.google-services' version '4.4.2' apply false
}

dependencies {

    implementation platform('com.google.firebase:firebase-bom:33.1.0')

    implementation 'com.google.firebase:firebase-auth'
    implementation 'com.google.firebase:firebase-firestore'
    implementation 'com.google.firebase:firebase-messaging'

}

data class Message(
    val senderId: String = "",
    val receiverId: String = "",
    val text: String = "",
    val timestamp: Long = System.currentTimeMillis()
)

class ChatRepository {

    private val db = FirebaseFirestore.getInstance()

    fun sendMessage(message: Message) {

        db.collection("messages")
            .add(message)
    }
}

fun listenMessages(
    chatId: String,
    onUpdate: (List<Message>) -> Unit
) {

    FirebaseFirestore.getInstance()
        .collection("messages")
        .addSnapshotListener { value, error ->

            if (value != null) {

                val messages =
                    value.toObjects(Message::class.java)

                onUpdate(messages)
            }
        }
}

class MyFirebaseMessagingService :
    FirebaseMessagingService() {

    override fun onNewToken(token: String) {
        super.onNewToken(token)

        Log.d("FCM_TOKEN", token)
    }

    override fun onMessageReceived(
        remoteMessage: RemoteMessage
    ) {
        super.onMessageReceived(remoteMessage)

        val title =
            remoteMessage.notification?.title

        val body =
            remoteMessage.notification?.body

        showNotification(title, body)
    }
}

<service
    android:name=".MyFirebaseMessagingService"
    android:exported="false">

    <intent-filter>
        <action android:name=
        "com.google.firebase.MESSAGING_EVENT"/>
    </intent-filter>

</service>

FirebaseMessaging.getInstance().token
    .addOnCompleteListener {

        if (it.isSuccessful) {

            val token = it.result

            Log.d("TOKEN", token)
        }
    }

users
   uid
      name
      fcmToken

{
  "to":"FCM_TOKEN",
  "notification":{
    "title":"پیام جدید",
    "body":"سلام، خوبی؟"
  }
}

interface NotificationApi {

    @POST("fcm/send")
    suspend fun sendNotification(
        @Body body: RequestBody
    )
}

private fun showNotification(
    title: String?,
    body: String?
) {

    val builder =
        NotificationCompat.Builder(this, "chat")

            .setContentTitle(title)
            .setContentText(body)
            .setSmallIcon(R.drawable.ic_launcher_foreground)
            .setPriority(
                NotificationCompat.PRIORITY_HIGH
            )

    NotificationManagerCompat.from(this)
        .notify(1, builder.build())
}

if (Build.VERSION.SDK_INT >=
    Build.VERSION_CODES.O) {

    val channel = NotificationChannel(
        "chat",
        "Chat Notification",
        NotificationManager.IMPORTANCE_HIGH
    )

    val manager =
        getSystemService(
            NotificationManager::class.java
        )

    manager.createNotificationChannel(channel)
}

@Composable
fun ChatScreen(
    messages: List<Message>
) {

    LazyColumn {

        items(messages) { message ->

            Text(
                text = message.text
            )
        }
    }
}

Button(
    onClick = {

        repository.sendMessage(
            Message(
                senderId = myId,
                receiverId = otherId,
                text = text
            )
        )
    }
) {
    Text("ارسال")
}

rules_version = '2';

service cloud.firestore {

  match /databases/{database}/documents {

    match /messages/{document} {

      allow read, write:
      if request.auth != null;
    }
  }
}

.limit(30)