Question

我正在关注有关Setting up a Firebase Cloud Messaging client app on Android的教程，该教程涉及将<service>组件添加到AndroidManifest.xml。

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

但是，我得到Unresolved class MyFirebaseMessagingService。我到底从哪里导入该类？

注意：我正在用科特林写作

Answer 1

在您提供的同一link上，提到您需要在项目中添加服务类，并在AndroidManifest.xml中声明它，如下所示：

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

所以基本上这些是您需要遵循的步骤：

在您的保留Java类的包中，创建一个名为MyFirebaseMessagingService的类（您可以选择任何名称）
如上所述，在AndroidManifest.xml中声明它。

您在上面的步骤1中定义的此类将扩展FirebaseMessagingService，因此它将具有一个称为onMessageReceived的方法，您必须重写该方法，如下所示：< / p>

   @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        // ...

    // TODO(developer): Handle FCM messages here.
    Log.d(TAG, "From: " + remoteMessage.getFrom());

    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.d(TAG, "Message data payload: " + remoteMessage.getData());

        if (/* Check if data needs to be processed by long running job */ true) {
            // For long-running tasks (10 seconds or more) use Firebase Job Dispatcher.
            scheduleJob();
        } else {
            // Handle message within 10 seconds
            handleNow();
        }

    }

    // Check if message contains a notification payload.
    if (remoteMessage.getNotification() != null) {
        Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
    }

    // Also if you intend on generating your own notifications as a result of a received FCM
    // message, here is where that should be initiated. See sendNotification method below.
}

如果您使用Kotlin编写代码，则需要将您的类命名为MyFirebaseMessagingService.kt，然后创建一个类并放在下面的代码中。该链接本身也提到了这一点。

override fun onMessageReceived(remoteMessage: RemoteMessage?) {
// ...

// TODO(developer): Handle FCM messages here.
Log.d(TAG, "From: ${remoteMessage?.from}")

// Check if message contains a data payload.
remoteMessage?.data?.isNotEmpty()?.let {
    Log.d(TAG, "Message data payload: " + remoteMessage.data)

    if (/* Check if data needs to be processed by long running job */ true) {
        // For long-running tasks (10 seconds or more) use Firebase Job Dispatcher.
        scheduleJob()
    } else {
        // Handle message within 10 seconds
        handleNow()
    }
}

// Check if message contains a notification payload.
remoteMessage?.notification?.let {
    Log.d(TAG, "Message Notification Body: ${it.body}")
}

// Also if you intend on generating your own notifications as a result of a received FCM
// message, here is where that should be initiated. See sendNotification method below.
}

未解决的类“ MyFirebaseMessagingService”

1 个答案: