求和运算期间 Cloud Firestore 中的值重复

Question

I am new to android developement and I want to create android calorie calculator app, calories of food are stored inside cloud firestore. This calorie counter is made of 5 value (breakfast,lunch,dinner,consumed_calories,and daily goal). After Calories are assigned to meal, I want to sum them into variable "consumed calories" which is the sum of 3 meals (breakfast,lunch and dinner). Daily Goal is (Daily Goal - Consumed Calories). When I add one food eg. apple = 52 kcals, everything works fine, but when I add one more apple Daily Goal is = Daily Goal - 156 instead of 104, It takes value from inserted food and sum it with choosen calories.

My Code For Food Insert:

 public void MealCalories(DocumentReference reference, int calories, TextView textView, String Meal) {
    reference.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
        @Override
        public void onSuccess(DocumentSnapshot documentSnapshot) {

            int meal = documentSnapshot.getLong(Meal).intValue();
            meal = meal + calories;
            AddData(Meal, meal, reference);
            textView.setText(String.valueOf(meal));


            ConsumedCalories(calories);


        }
    });
}

public void ConsumedCalories(int calories) {
    MealRef.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
        @Override
        public void onSuccess(DocumentSnapshot documentSnapshot) {

            firebaseUser = FirebaseAuth.getInstance().getCurrentUser();


            int breakfast = documentSnapshot.getLong("Breakfast: " + uid).intValue();
            int lunch = documentSnapshot.getLong("Lunch: " + uid).intValue();
            int dinner = documentSnapshot.getLong("Dinner: " + uid).intValue();
            int consumed = documentSnapshot.getLong("Consumed Calories: " +uid).intValue();


                consumed = breakfast + lunch + dinner ;


            MealRef.update("Consumed Calories: " + uid, consumed);
            daily_goal.setText(String.valueOf(consumed));

            int daily_calories = documentSnapshot.getLong("Daily Goal: " + uid).intValue();

            daily_calories = daily_calories - consumed;

            MealRef.update("Daily Goal: "+ uid,daily_calories);

        }
    });
}

Daily Goal was supposed to be 1896.

Answer 1

It appears that your code is fetching the consumed value from the snapshot, and then immediately overwriting it:

int consumed = documentSnapshot.getLong("Consumed Calories: " +uid).intValue();
consumed = breakfast + lunch + dinner ;

Is this intentional? Should it be consume += breakfast... etc?