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Q: Detect when new FCM token generated from outside the service I need to clean the firebase token when the user sign out and need to stop him from getting push notifications from the backend.
What I have done so far is,
I have created the firebase service and I am controlling the automatic token generation by the following code
In Manifest,
<!-- FCM: Disable auto-init -->
    <meta-data android:name="firebase_messaging_auto_init_enabled"
        android:value="false" />
    <meta-data android:name="firebase_analytics_collection_enabled"
        android:value="false" />

In the log out Activity,
 Thread {
         try {
           FirebaseInstanceId.getInstance().deleteInstanceId()
           FirebaseMessaging.getInstance().isAutoInitEnabled = true
           FirebaseMessaging.getInstance().isAutoInitEnabled = false
         } catch (e: IOException) {
           e.printStackTrace()
         }
       }.start()

 and I'm getting the new token in the Login Activity by below code,
FirebaseInstanceId.getInstance().instanceId.addOnSuccessListener {
            devicePushToken = it.token
            sharedPreferences.setValue(Constant.FCM_PUSH, devicePushToken)
            Log.e(TAG + '2', it?.token.toString())
        }

 But the problem is, it returns the deleted old FCM token. The new token generation takes some time. It is generated correctly in the service OnNewToken method but I couldn't find a way to get the new token using a callback from the service to the Login Activity.And also If I wait some time and request again using the above(FirebaseInstanceId.getInstance().instanceId.addOnSuccessListener) method It returns the correct token

A: I found an answer for this question myself,
So I'm going to post it here for anyone who faced this issue like me...
I have used rxJava observable to achieve this
First, you need to add an observable in the firebase service
companion object{
    private var tokenData: PublishSubject<String> = PublishSubject.create()

    fun getObservable(): PublishSubject<String> {
        return tokenData
    }
}

And the in onNewToken method you can set the observerble value when new token is generated,
override fun onNewToken(token: String) {
    super.onNewToken(token)
    tokenData.onNext(token)
}

Then you can get the newly generated token once it's generated by the following method,
val tokenObservable: Observable<String> =PushNotificationService.getObservable()
val tokenSubscriber = object: io.reactivex.Observer<String> {
            override fun onNext(token: String) {
                println("**********$token")
                sharedPreferences.setValue(Constant.FCM_PUSH, token)
                activity?.setResult(RequestCodes.RESULT_NAV_LOGOUT).also {
                    activity?.finish()
                }
                hideProgress()//Display a progressbar so that user can wait untill new token is generated and hide it here on success

            }

            override fun onComplete() {
                println("onComplete")

            }

            override fun onError(e: Throwable) {
                e.printStackTrace()
                activity?.setResult(RequestCodes.RESULT_NAV_LOGOUT).also {
                    activity?.finish()
                }
                hideProgress()
            }

            override fun onSubscribe(s: Disposable) {
                println("onSubscribe")
            }
        }

        tokenObservable.subscribe(tokenSubscriber)

A: in java you can achieve this by the following code. From any activity/fragment you can call it.
new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                FirebaseInstanceId.getInstance().deleteInstanceId();

                FirebaseInstanceId.getInstance().getInstanceId()
                        .addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
                            @Override
                            public void onComplete(@NonNull Task<InstanceIdResult> task) {
                                if (!task.isSuccessful()) {
                                    Log.w(TAG, "getInstanceId failed", task.getException());
                                    return;
                                }

                                // Get new Instance ID token
                                String token = task.getResult().getToken();

                                // Log and toast
                                Log.d(TAG, token);

                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        Toast.makeText(LoginActivity.this, token, Toast.LENGTH_SHORT).show();
                                    }
                                });
                            }
                        });
            } catch (IOException e) {
                e.printStackTrace();
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(LoginActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                    }
                });

            }
        }
    }).start();


You are invited to the Open Day of the Faculty of Economics and Management at Czech University of Life Science Prague (FEM, in Czech - Provozně ekonomická fakulta - PEF) on Friday, 23 November 2018 from 9:00 a.m. to 1:00 p.m.
Come explore the CULS campus, where you can find absolutely everything - faculty, canteen, Study Information Center, library, sports field, clubs and restaurants, park called "Libosad" and much more.
For more information about faculty and photo gallery go here.
You can also visit a real lecture or participate in a fun online game.
How to get to FEM?
Take the metro line A (the green line) to the stop "Dejvická", exit the metro station in the direction of "Sedlec". Take the bus number 107 or 147. Get off the bus at the bus stop "Zemědělská univerzita". Go through the closest major intersection in the direction to the university campus. Go straight and when you see the red building of the Faculty of Economics and Management you reached your destination..


text:
WRIC Channel 8
Programming: ABC
ID: "8 News"
City: Petersburg, VA
Owner: Nexstar Media Group
Web Site: http://www.wric.com/
Station Info: Digital Full-Power - 850 kW
Market: Richmond - Petersburg
8.1 WRIC/ABC
8.2 Live Well Network
WRIC is a television station in Petersburg, VA that serves the Richmond - Petersburg television market. The station runs programming from the ABC network and identifies itself as "8 News". WRIC is a digital full-power television station that operates with 850 kilowatts of power and is owned by Nexstar Media Group.
Detailed Engineering Information / WRIC FCC Applications
Find more stations owned by Nexstar.

redpajama_set_name: RedPajamaCommonCrawl


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The 14th Annual Greater Boston Walk Now for Autism Speaks is set for this Sunday at the Xfinity Center in Mansfield, Mass., just south of Gillette Stadium. And, for the 11th year BU Hockey is actively involved at the "Walk" as well as in other activities with the Autism community throughout the school year. Details of the day's activities, including the walk, and musical and reading performance are here.
Terrier sophomore Doyle Somerby teamed with BU women's basketball junior Clodagh Scannell for a special video invitation to participate in the Boston Walk Now event.
All event proceeds support Autism Speaks' work, both locally and nationally, to increase awareness about autism, fund innovative research and family services, and advocate for the needs of individuals with autism and their families throughout the Greater Boston Community.
Terriers at the 2012 Autism Walk event at Suffolk Downs.
► SB Nation's Jeff Cox reports on Five Reasons to Believe for Terriers' fans.
► In case you missed it, Episode 2 of Inside BU Hockey has been posted with Corbett's interviews with Coach David Quinn, Associate Coach Steve Greeley and freshman forward Nikolas Olsson.
► The Providence Journal's Mark Divver reports that highly regarded NTDP U18 forward Auston Matthews is talking to four NCAA schools, including the Terriers. A late 1997 birthdate, he's a junior in high school. Last season, he was called up from the U17s to to skate with the U18s in the IIHF World U18 Championships, won by Team USA.
The St. Louis Post-Dispatch reports that, according to Blues's coach Ken Hitchcock, Kevin Shattenkirk has been the team's top defenseman thus far this season.
#6 Terriers are back on the road and that road doesn't get any easier as the competition is #7 and defending NCAA champion Clarkson. The Terriers and Golden Knights play a pair of 3 p.m. matinees today and tomorrow. These two teams last met in 2013, when BU defeated Clarkson 5-3 in an NCAA quarterfinal game that was held at Walter Brown Arena.
After two regular-season games, sophomore Maddie Elia (photo) leads BU in scoring with four points.


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