FCM如何在点击通知时从后台打开应用程序时获得Notification().getTitle()

Question

当应用程序未运行并且用户点击通知时，它将打开启动屏幕，但它获得了Extras，没有像标题和正文这样的键。但如果应用程序正在工作，并且从MyFirebaseMessagingService发送通知，那么它将打印标题和正文。这里的问题是什么？

if (getIntent().getExtras() != null) {
for (String key : getIntent().getExtras().keySet()) {
String value = getIntent().getExtras().getString(key);
switch (key){
case "body":{
if(value.contains("order successfully")){
orderSuccessfully=true;
}
break;
}
}
Log.d("readingNotiMain", "Key: " + key + " Value: " + value+"  vc:"+value.contains("order successfully"));
}
}

public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = "MyFirebaseMsgService";
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
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) {
sendNotification(remoteMessage.getNotification().getTitle(), remoteMessage.getNotification().getBody());
if(remoteMessage.getData()!=null){
Log.i(TAG,"data:"+new Gson().toJson(remoteMessage.getData())+"");
Log.i(TAG,"don "+new Gson().toJson(remoteMessage.getData()));
}
Log.d(TAG, "Message Notification title: " + remoteMessage.getNotification().getTitle()
+" n Body"+ remoteMessage.getNotification().getBody());
}
}
@Override
public void onNewToken(String token) {
Log.d(TAG, "Refreshed token: " + token);
sendRegistrationToServer(token);
}
// [END on_new_token]
private void scheduleJob() {
//        // [START dispatch_job]
//        FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(this));
//        Job myJob = dispatcher.newJobBuilder()
//                .setService(MyJobService.class)
//                .setTag("my-job-tag")
//                .build();
//        dispatcher.schedule(myJob);
//        // [END dispatch_job]
}

private void handleNow() {
Log.d(TAG, "Short lived task is done.");
}

private void sendRegistrationToServer(String token) {
// TODO: Implement this method to send token to your app server.
}

private void sendNotification(String title,String messageBody) {
Intent intent = new Intent(this, Main_Act.class);
intent.putExtra("body",messageBody);
intent.putExtra("title",title);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Intent orderPageIntent=new Intent(getApplicationContext(),Main_Act.class);
String channelId = getString(R.string.default_notification_channel_id);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(this, channelId)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setContentTitle(getString(R.string.fcm_message))
.setContentText(messageBody)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// Since android Oreo notification channel is needed.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(channelId,
"ssss",
NotificationManager.IMPORTANCE_DEFAULT);
notificationManager.createNotificationChannel(channel);
}
notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}
}

Answer 1

实际上，在FCM中有两种类型的有效载荷(消息类型(可用，一种是Data，另一种是Notification，所以如果你正在使用通知有效载荷，那么当应用程序在后台时，你无法在onReceive中处理通知，而在前台，你可以处理它，所以我只是建议，如果你想在两种情况下都使用数据，那么只放data有效载荷，不要放notification有效载荷

您可以从以下文件中获得更多理解

关于FCM消息类型

这是服务器端有效负载示例

带通知有效负载

{"to":"[add your token]","notification":{"title":"Working Good","body":"[add your message]"},"priority":"high"}

带数据有效载荷

{"to":"[add your token]","data":{"title":"Working Good","body":"[add your message]"},"priority":"high"}