问题描述
我想向所有设备发送消息,但我只向一个设备发送消息,这是我发送消息的方式:我只能向一个用户发送消息,当我在我的发送消息方法中删除它时:
I want to send a message to all device but I only send to one device this is how I send a message : I only can send message to one user , when I remove this at my method to send a message:
json.put("to", tokenId.trim());
当我有这条线时,消息不会发送给任何人我只向一个用户发送消息.我如何向每个人发送消息?
a message is not send to nobody when I have this line I send a message to only one user . How I can send a message to every one ?
static void send_FCM_Notification(String tokenId, String server_key, String message) { try { URL url = new URL(FCM_URL); // create connection. HttpURLConnection conn; conn = (HttpURLConnection) url.openConnection(); conn.setUseCaches(false); conn.setDoInput(true); conn.setDoOutput(true); //set method as POST or GET conn.setRequestMethod("POST"); //pass FCM server key conn.setRequestProperty("Authorization", "key=" + server_key); //Specify Message Format conn.setRequestProperty("Content-Type", "application/json"); //Create JSON Object & pass value JSONObject infoJson = new JSONObject(); infoJson.put("title", "Wiadomosc z serwera"); infoJson.put("sound", "default"); infoJson.put("icon", "ic_launcher"); infoJson.put("body", message); JSONObject json = new JSONObject(); json.put("to", tokenId.trim()); json.put("notification", infoJson); OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream()); wr.write(json.toString()); wr.flush(); int status = 0; if (null != conn) { status = conn.getResponseCode(); } if (status != 0) { if (status == 200) { //SUCCESS message BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); System.out.println("Android Notification Response : " + reader.readLine()); } else if (status == 401) { //client side error System.out.println("Notification Response : TokenId : " + tokenId + " Error occurred : 401"); } else if (status == 501) { //server side error System.out.println("Notification Response : [ errorCode=ServerError ] TokenId : " + tokenId); } else if (status == 503) { //server side error System.out.println("Notification Response : FCM Service is Unavailable TokenId : " + tokenId); } } } catch (MalformedURLException mlfexception) { // Prototcal Error System.out.println("Error occurred while sending push Notification!.." + mlfexception.getMessage()); } catch (IOException mlfexception) { //URL problem System.out.println("Reading URL, Error occurred while sending push Notification!.." + mlfexception.getMessage()); } catch (JSONException jsonexception) { //Message format error System.out.println("Message Format, Error occurred while sending push Notification!.." + jsonexception.getMessage()); } catch (Exception exception) { //General Error or exception. System.out.println("Error occurred while sending push Notification!.." + exception.getMessage()); } }
推荐答案
Firebase 支持所谓的 topics
Firebase supports what is called topics
因此,您可以向某个主题发送消息,订阅该主题的所有设备都会收到推送.
So you can send a message to a topic and all the devices subscribed to that topic will get the push.
您可以有一个名为 all 的主题,然后将每个设备注册到该主题.
You can have a topic called all and then register each device to that.
这是您的注册方式
FirebaseMessaging.getInstance().subscribeToTopic("all");
然后,您只需向该主题发送通知,您的所有用户都会收到它.
Then you can just fire notifications to that topic and all your users will get it.
然后替换这一行
json.put("to", tokenId.trim());
与
json.put("to", "/topics/your-topic-name");
在这种情况下,您的主题名称是 all
In this case your topic name is all