推送通知未显示在通知栏中 Android 中

Question

我刚刚迁移到androidx来实现Firebase消息传递。我已将所有内容更改为 androidx，并将我的应用程序连接到 Firebase。起初，当我从Firebase控制台发送通知时，它会崩溃。为了避免崩溃，我将FirebaseApp.initializeApp(this);放在我的 MainActivity 中。

但是我仍然没有在通知列表中看到任何通知。

在我的Manifest里，我把

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

对于MyFirebaseMessagingService

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    public static final String TAG = "FirebaseSerive";
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        String title = remoteMessage.getData().get("title");
        String body = remoteMessage.getData().get("body");
        Notification notification = new Notification.Builder(this)
            .setContentTitle(title)
            .setContentText(body)
            .setSmallIcon(R.drawable.ss_icon)
            .build();
        NotificationManagerCompat manager = NotificationManagerCompat.from(getApplicationContext());
        manager.notify(/*notification id*/0, notification);
    }
}

更新我的代码后，我的模拟器显示Failed to post notification on channel “null”

提前感谢您的帮助。希望你能帮助我。

Answer 1

您可以尝试使用OREO中引入的这个频道。可能是导致问题的原因。

    public class MyFirebaseMessagingService extends FirebaseMessagingService {
    public static final String TAG = "FirebaseSerive";
    public static final String NOTIFICATION_CHANNEL_ID = "IMP_NOTIFICATIONS";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        String title = remoteMessage.getNotification().getTitle();
        String body = remoteMessage.getNotification().getBody();
        Notification.Builder notification = new Notification.Builder(this)
                .setContentTitle(title)
                .setContentText(body)
                .setSmallIcon(R.drawable.ss_icon);
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "NOTIFICATION_CHANNEL_NAME", importance);
            notificationChannel.enableLights(true);
            notificationChannel.setLightColor(Color.RED);
            notificationChannel.enableVibration(true);
            notificationChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
            assert mNotificationManager != null;
            notification.setChannelId(NOTIFICATION_CHANNEL_ID);
            mNotificationManager.createNotificationChannel(notificationChannel);
        }
        mNotificationManager.notify(/*notification id*/0, notification.build());
    }
}

编辑：可能是您正在获得通知有效负载而不是数据，您可以使用以下代码进行检查。

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

例如，在此处阅读更多内容。

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