android - 通过单击通知调用 Firebase onMessageReceived

Question

当应用程序通过点击通知处于前台或后台时，应用程序调用 onMessageReceived 事件。我使用 click_action 通知。对吗？

我在应用程序位于前台时创建一个通知，当我点击该通知时它会再次执行该方法并创建另一个通知。

Answer 1

onMessageReceived 是一种在 android 客户端从 Firebase Cloud 接收到消息时调用的方法。通常，我们在这个方法中创建一个函数来构建通知。

对于点击通知时发生的情况，我们可以使用 pendingIntent。

我们可以在this github repo中看到来自google的示例

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = "MyFirebaseMsgService";

// [START receive_message]
@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());
    }

    // 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
    sendNotification(remoteMessage.getNotification().getBody());
}
// [END receive_message]

/**
 * Create and show a simple notification containing the received FCM message.
 *
 * @param messageBody FCM message body received.
 */
private void sendNotification(String messageBody) {
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT);

    Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_stat_ic_notification)
            .setContentTitle("FCM Message")
            .setContentText(messageBody)
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent);

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

    notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}
}