android - 当应用程序被杀死时，FCM 不工作

Question

我正在使用 fcm 在我的应用程序中发送通知，但是当应用程序关闭并从最近的应用程序中清除时，通知不会到来。我会使用 FCM api 向特定主题发送通知。
注意:- 当应用程序在后台时，通知工作正常

这是我的 FirebaseMessagingService 代码

@RequiresApi(api = Build.VERSION_CODES.O)

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {


    String title = remoteMessage.getNotification().getTitle();
    String body = remoteMessage.getNotification().getBody();

    Map<String, String> extraData = remoteMessage.getData();

 Log.d("DATA",remoteMessage.getData().toString());

    NotificationCompat.Builder notificationBuilder =
            new NotificationCompat.Builder(this, "TAC")
                    .setContentTitle(title)
                    .setContentText(body)
                    .setSmallIcon(R.drawable.ic_launcher_background);





    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);


    int id =  (int) System.currentTimeMillis();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        NotificationChannel channel = new NotificationChannel("TAC","demo",NotificationManager.IMPORTANCE_HIGH);
        notificationManager.createNotificationChannel(channel);
    }
    notificationManager.notify(id,notificationBuilder.build());

}

}

这是通知发送者类代码

公共(public)类 NotificationSender {

public  static RequestQueue mRequest;
public static String URL="https://fcm.googleapis.com/fcm/send";

public static void sendnotification(Context context,String sendto, String title, JSONObject extra){
    mRequest = Volley.newRequestQueue(context);
    JSONObject mainbody = new JSONObject();
    try {
        mainbody.put("to","/topics/"+sendto);
          mainbody.put("priority","high");
        JSONObject notification = new JSONObject();
        notification.put("title","New Notification");
        notification.put("body",title);
        mainbody.put("notification",notification);
          //  mainbody.put("data",extra);
            JSONObject data = new JSONObject();
            data.put("key",title);
            mainbody.put("data",data);


        JsonObjectRequest request=new JsonObjectRequest(Request.Method.POST, URL, mainbody, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        }){
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String,String> header = new HashMap<>();
                header.put("content-type","application/json");
                header.put("authorization","key=AIzaSyAfZqD0MW39WIGRBDFG0si3-HszFA");
               // AIzaSyAfZqD0MW39WIu9pWraYA0AG0si3-HszFA
                return header;
            }
        };
        mRequest.add(request);
    } catch (JSONException e) {
        e.printStackTrace();
    }






}

}

这是我关闭电池优化的代码

 if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        final Intent intent = new Intent();
        final String packageName = getPackageName();
        PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);
        if (!pm.isIgnoringBatteryOptimizations(packageName)) {
            AlertDialog ad= new AlertDialog.Builder(this).setTitle("IMPORTANT").setMessage("For The Proper Working Of The App,Please Disable Battery Optimization For This App").setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    intent.setAction(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);
                    intent.setData(Uri.parse("package:" + packageName));
                    startActivity(intent);

                }
            }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    finishAffinity();
                    System.exit(0);
                }
            }).create();
            ad.show();
        }
    }

Answer 1

许多中国制造商为了节省电池而关闭了该应用程序的后台服务。通知服务的运行是接收推送通知的主要方式。
但是，如果您可以在“设置”中将您的应用从电池优化中删除，那么当您的应用处于后台或您已终止该应用时，您将收到推送通知。
这可能看起来很傻，但是当我遇到同样的问题时，我从电池优化中删除了我的应用程序并且它起作用了!