当应用程序被杀死时，来自 FCM 的数据消息未启用 onMessagereceived

Question

根据https://firebase.google.com/docs/cloud-messaging/concept-options#notifications_and_data_messages，我可以使用将 100% 收到 onMessageReceived 方法的数据消息并采取相应措施。但就我而言，当应用程序被杀死时，我的任何消息都没有收到。虽然它们有时会在我仅在 Nexus 5 上进行测试时收到。下面是我的数据负载。

05-16 06:46:01.663 13199-29574/jss.test E/MyFirebaseMsgService: Data Payload: {data={"image":null,"title":"My message"}}
05-16 06:46:01.667 13199-29574/jss.test E/Providerfalse: true
05-16 06:46:01.667 13199-29574/jss.test E/MyFirebaseMsgService: Notification JSON {"data":{"image":null,"title":"My message"}}

FCM 清单如下：

 <service
            android:name=".FirebaseMessagingService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

Firebase 消息服务：

  @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        if (remoteMessage.getData().size() > 0) {

            Log.e(TAG, "Data Payload: " + remoteMessage.getData().toString());
            try {
                JSONObject json = new JSONObject(remoteMessage.getData().toString());
                sendPushNotification(json);
            } catch (Exception e) {
                Log.e(TAG, "Exception: " + e.getMessage());
            }
        }
    }


    //this method will display the notification
    //We are passing the JSONObject that is received from
    //firebase cloud messaging
    private void sendPushNotification(JSONObject json) {
                   //optionally we can display the json into log
        Log.e(TAG, "Notification JSON " + json.toString());
        try {
            //getting the json data
            JSONObject data = json.getJSONObject("data");

            //parsing json data
            String title = data.getString("title");
            String message = data.getString("message");
            String imageUrl = data.getString("image");

//code to call service if message has specific data values.
    }
        catch (Exception e) {
                    e.printStackTrace();    }}

您能否指导我修复的位置以使其完美运行。

Answer 1

根据我在 fcm 实现中的测试，如果我在数据和通知键中都传递数据，那么我能够在 onMessageReceived 方法中仅在应用程序运行时获得通知，否则我无法获得通知，并且如果我正在使用只有用于发送通知的数据键，然后它在两种情况下都有效， 因此，如果您的通知数据中存在通知键，请删除它，并对其进行测试，它可能会起作用。

Answer 2

试试下面的方法对你有帮助

private void sendNotification(String text, String senderId, String receiverId) {
        HttpsURLConnection conHttp = null;
        try {

            URL url = new URL("https://fcm.googleapis.com/fcm/send");
            conHttp = (HttpsURLConnection) url.openConnection();
            conHttp.setDoOutput(true);
            conHttp.setDoInput(true);
            conHttp.setRequestMethod("POST");
            conHttp.setRequestProperty("Content-Type", "application/json");
            //Put below you FCM API Key instead
            conHttp.setRequestProperty("Authorization", "key="
                    + “YOUR_FCM_API_KEY”);

            JSONObject root = new JSONObject();
            JSONObject data = new JSONObject();
            data.put(KEY_FCM_TEXT, text);
            data.put(KEY_FCM_SENDER_ID, sender);
            root.put("data", data);
            root.put("to", "/topics/user_" + receiverId);

            byte[] outputBytes = root.toString().getBytes("UTF-8");
            OutputStream os = conHttp.getOutputStream();
            os.write(outputBytes);
            os.flush();
            os.close();
            conHttp.getInputStream(); //do not remove this line. request will not work without it gg

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {
            if (conHttp != null) conHttp.disconnect();
        }
    }

Answer 3

在您的服务清单中再定义一件事：

android:stopWithTask="false"

它应该可以工作，否则在应用程序被杀死时没有方法从 onMessageReceived 获取消息。

Answer 4

尝试使用 getBody() 代替 getData()：

    @Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);
    if (remoteMessage.getBody().toString.length() > 0) {

        Log.e(TAG, "Data Payload: " + remoteMessage.getBody().toString());
        try {
            JSONObject json = new JSONObject(remoteMessage.getBody().toString());
            sendPushNotification(json);
        } catch (Exception e) {
            Log.e(TAG, "Exception: " + e.getMessage());
        }
    }
}


//this method will display the notification
//We are passing the JSONObject that is received from
//firebase cloud messaging
private void sendPushNotification(JSONObject json) {
               //optionally we can display the json into log
    Log.e(TAG, "Notification JSON " + json.toString());
    try {
        //getting the json data
        JSONObject data = json.getJSONObject("data");

        //parsing json data
        String title = data.getString("title");
        String message = data.getString("message");
        String imageUrl = data.getString("image");

}
    catch (Exception e) {
                e.printStackTrace();    }}

Answer 5

public class MyService extends Service {
    public MyService() {
    }
    public int onStartCommand(Intent intent, int flags, int startId) {
       // Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();

        // For each start request, send a message to start a job and deliver the
        // start ID so we know which request we're stopping when we finish the job
       startService(new Intent(getApplicationContext(),          FirebaseMessagingService.class));

        // If we get killed, after returning from here, restart
        return START_STICKY;
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }
}