Vfrdtyky

Application uses the onDataChange() method to check for changes within my Firebase Database and it works fine. I will update a textview depending on whether the child node exists in my database and it works fine.

However, Functions which I have written outside and called it together with the textview update will not run the very first time the activity is loaded. I have to move to a different activity then load the original activity again before the other functions will work as expected.

    PDatabase = FirebaseDatabase.getInstance().getReference().child("Prescription");



    PDatabase.child(SignInIC.CustomUID).addValueEventListener(new ValueEventListener() {



        @Override

        public void onDataChange(@NonNull DataSnapshot dataSnapshot)

        {

            if (dataSnapshot.exists()) {



                String medname = dataSnapshot.child("medication").getValue().toString();

                String Strength = dataSnapshot.child("dosage").getValue().toString();

                String Method = dataSnapshot.child("method").getValue().toString();

                String Pills = dataSnapshot.child("pills").getValue().toString();

                String Freq = dataSnapshot.child("freq").getValue().toString();

                String Duration = dataSnapshot.child("duration").getValue().toString();



                Days = Duration + " day prescription of " + medname + "left";





                if (Duration.equals("0"))

                {



                    Days = "Your prescription of " + medname + "will end today";

                }



                Home_Days = "for " + Duration + " more days";



                if (Duration.equals("0"))

                {

                    Home_Days = "will end today";

                }



                if (Freq.equals("once a day "))

                {

                    countDownTimerMedsAttndonce.start();

                }



                if (Freq.equals("twice a day "))

                {

                    countDownTimerMedsAttndtwice.start();

                }



                if (Freq.equals("once a day every 12 hours "))

                {

                    countDownTimerMedsAttndonce.start();

                }



                if (Freq.equals("twice a day every 12 hours "))

                {

                    countDownTimerMedsAttndtwice.start();

                }



                if(medname.equals("Enoxaparin ") || medname.equals("Fondaparinux "))

                {



                    TV.setVisibility(View.VISIBLE);

                    TV.setText(medname + "(" + Strength + ")" + Method + Freq + Home_Days);

                    addNotification();

                    countDownTimer.start();



                }

                else

                {



                    TV.setVisibility(View.VISIBLE);

                    TV.setText(medname + Pills + "pills" + "(" + Strength + ")" + Method + Freq + Home_Days);

                    addNotification();

                    countDownTimer.start();

                }

            }

            else

                {

                    TV.setVisibility(View.VISIBLE);

                    TV.setText("You currently have no prescribed medication");



            }



        }

        @Override

        public void onCancelled(@NonNull DatabaseError databaseError) {

        }

    });



private void addNotification()

{

    // Builds your notification

    NotificationCompat.Builder builder = new NotificationCompat.Builder(this)

            .setSmallIcon(R.mipmap.ic_launcher_round)

            .setContentTitle("Medimate")

            .setContentText(Days)

            .setDefaults(Notification.DEFAULT_SOUND)

            .setAutoCancel(true)

            .setPriority(Notification.PRIORITY_DEFAULT);



    // Creates the intent needed to show the notification

    if(findViewById(R.id.homeTV).isShown())

    {

        return;

    }

    else

    {

        Intent notificationIntent = new Intent(this, Alarm.class);

        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        builder.setContentIntent(contentIntent);

    }



    // Add as notification

    NotificationManager nmagr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

    Notification notification=builder.build();

    notification.flags = Notification.FLAG_AUTO_CANCEL;

    nmagr.notify(1,notification);

}

The functions that wont execute the first time the activity is loaded are addNotification(); and countDownTimer.start();