对于kotlin，我使用以下方法

val fcmtoken = FirebaseMessaging.getInstance().token.await()

对于扩展函数

public suspend fun <T> Task<T>.await(): T {
    // fast path
    if (isComplete) {
        val e = exception
        return if (e == null) {
            if (isCanceled) {
                throw CancellationException("Task $this was cancelled normally.")
            } else {
                @Suppress("UNCHECKED_CAST")
                result as T
            }
        } else {
            throw e
        }
    }

    return suspendCancellableCoroutine { cont ->
        addOnCompleteListener {
            val e = exception
            if (e == null) {
                @Suppress("UNCHECKED_CAST")
                if (isCanceled) cont.cancel() else cont.resume(result as T)
            } else {
                cont.resumeWithException(e)
            }
        }
    }
}

这:

FirebaseInstanceId.getInstance().getInstanceId().getResult().getToken()

假定为已弃用的解决方案:

FirebaseInstanceId.getInstance().getToken()

EDIT

.getToken .getResult .getInstanceId FirebaseInstanceId.getInstance () () () () 如果任务还没有完成，可以产生异常，所以Nilesh Rathod描述的方法(使用. addonsuccesslistener)是正确的方法。

科特林：

FirebaseInstanceId.getInstance().instanceId.addOnSuccessListener(this) { instanceIdResult ->
        val newToken = instanceIdResult.token
        Log.e("newToken", newToken)
    }

下面是c# /Xamarin的解决方案。Android:

var token = await FirebaseInstallations.Instance.GetToken(forceRefresh: false).AsAsync<InstallationTokenResult>();

新方式

FirebaseMessaging.getInstance().getToken().addOnCompleteListener(task -> Log.e(TAG, "Token: "+task.getResult()));

更新11-12-2020

现在FirebaseInstanceId也被弃用了

现在我们需要使用FirebaseMessaging.getInstance().token

示例代码

        FirebaseMessaging.getInstance().token.addOnCompleteListener {
            if(it.isComplete){
                firebaseToken = it.result.toString()
                Util.printLog(firebaseToken)
            }
        }

    

是FirebaseInstanceIdService已弃用

来自DOCS:这个类已弃用。 支持在FirebaseMessagingService中覆盖onNewToken。一旦实现了该功能，就可以安全地删除该服务。

无需使用FirebaseInstanceIdService服务获取FCM token即可安全移除FirebaseInstanceIdService服务

现在我们需要在FirebaseMessagingService中@Override onNewToken获取Token

示例代码

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    @Override
    public void onNewToken(String s) {
        Log.e("NEW_TOKEN", s);
    }

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        Map<String, String> params = remoteMessage.getData();
        JSONObject object = new JSONObject(params);
        Log.e("JSON_OBJECT", object.toString());

        String NOTIFICATION_CHANNEL_ID = "Nilesh_channel";

        long pattern[] = {0, 1000, 500, 1000};

        NotificationManager mNotificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "Your Notifications",
                    NotificationManager.IMPORTANCE_HIGH);

            notificationChannel.setDescription("");
            notificationChannel.enableLights(true);
            notificationChannel.setLightColor(Color.RED);
            notificationChannel.setVibrationPattern(pattern);
            notificationChannel.enableVibration(true);
            mNotificationManager.createNotificationChannel(notificationChannel);
        }

        // to diaplay notification in DND Mode
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = mNotificationManager.getNotificationChannel(NOTIFICATION_CHANNEL_ID);
            channel.canBypassDnd();
        }

        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);

        notificationBuilder.setAutoCancel(true)
                .setColor(ContextCompat.getColor(this, R.color.colorAccent))
                .setContentTitle(getString(R.string.app_name))
                .setContentText(remoteMessage.getNotification().getBody())
                .setDefaults(Notification.DEFAULT_ALL)
                .setWhen(System.currentTimeMillis())
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setAutoCancel(true);


        mNotificationManager.notify(1000, notificationBuilder.build());
    }
}

#编辑

您需要在清单文件中注册您的FirebaseMessagingService

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

#如何在您的活动中获得令牌

.getToken ();也是不赞成的 如果你需要在你的活动中获取令牌，请使用getInstanceId ()

现在我们需要使用getInstanceId()来生成令牌

返回此Firebase项目的ID和自动生成的令牌。

这将生成一个实例ID，如果它还不存在，它会定期向Firebase后端发送信息。

返回

任务，您可以使用该任务通过包含ID和令牌的InstanceIdResult查看结果。

示例代码

FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener( MyActivity.this,  new OnSuccessListener<InstanceIdResult>() {
     @Override
     public void onSuccess(InstanceIdResult instanceIdResult) {
           String newToken = instanceIdResult.getToken();
           Log.e("newToken",newToken);

     }
 });

# #编辑2

下面是kotlin的工作代码

class MyFirebaseMessagingService : FirebaseMessagingService() {

    override fun onNewToken(p0: String?) {

    }

    override fun onMessageReceived(remoteMessage: RemoteMessage?) {


        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        val NOTIFICATION_CHANNEL_ID = "Nilesh_channel"

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationChannel = NotificationChannel(NOTIFICATION_CHANNEL_ID, "Your Notifications", NotificationManager.IMPORTANCE_HIGH)

            notificationChannel.description = "Description"
            notificationChannel.enableLights(true)
            notificationChannel.lightColor = Color.RED
            notificationChannel.vibrationPattern = longArrayOf(0, 1000, 500, 1000)
            notificationChannel.enableVibration(true)
            notificationManager.createNotificationChannel(notificationChannel)
        }

        // to diaplay notification in DND Mode
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = notificationManager.getNotificationChannel(NOTIFICATION_CHANNEL_ID)
            channel.canBypassDnd()
        }

        val notificationBuilder = NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)

        notificationBuilder.setAutoCancel(true)
                .setColor(ContextCompat.getColor(this, R.color.colorAccent))
                .setContentTitle(getString(R.string.app_name))
                .setContentText(remoteMessage!!.getNotification()!!.getBody())
                .setDefaults(Notification.DEFAULT_ALL)
                .setWhen(System.currentTimeMillis())
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setAutoCancel(true)


        notificationManager.notify(1000, notificationBuilder.build())

    }
}

getInstance(). getinstanceid()现在也已弃用，现在正在使用FirebaseMessaging。

FirebaseMessaging.getInstance().token.addOnCompleteListener { task ->
    if (task.isSuccessful) {
        val token = task.result
    } else {
        Timber.e(task.exception)
    }
}