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在 Firebase onMessageReceived(RemoteMessage remoteMessage) 中，当您的应用程序处于前台时将调用此方法。因此，在单击通知时，您可以打开一个不同的 Activity ，比如 NotiicationActivity。
但是如果你的应用程序在后台，那么这个方法将不会被调用，并且在点击通知时只会打开一个 Launcher Activity。
那么即使我们的应用程序处于后台，如何在单击通知时打开 NotificationActivity。
我的代码是这样的:
public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = "MyFirebaseMsgService";
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
Log.d(TAG, "From: " + remoteMessage.getFrom());
if (remoteMessage.getData().size() > 0) {
Log.d(TAG, "Message data payload: " + remoteMessage.getData());
}
if (remoteMessage.getNotification() != null) {
Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
}
sendNotification(remoteMessage.getNotification().getBody());
}
private void sendNotification(String messageBody) {
Intent intent = new Intent(this, NewActivity.class);
intent.putExtra("key", messageBody);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Bitmap icon2 = BitmapFactory.decodeResource(getResources(),
R.mipmap.ic_launcher);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("FCM Sample")
.setContentText(messageBody)
.setAutoCancel(true)
.setLargeIcon(icon2)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(new Random().nextInt() /* ID of notification */, notificationBuilder.build());
}
}