Android

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i want to create a simple login app in android studio in that i want to fetch first time username and password from local database sqlite and after that when we log in then the imei number of device can store in database...then when we try to log in next time it will login through only that imei number

Today I come to you with one question - I am currently creating an Android application that works with the firestore and implemented a class that checks the account type. Everything works fine, however I would now like to get the value of "typeOfAcc" from this class in a different class as it will be the path to my document in the database, however, there is one condition - the path must be downloaded only after the data is downloaded from the database and based on it it will be determined whether the account type should be changed to "Trainers". Anyone have any idea? All my attempts so far have ended with the second class just getting this string before changing its value, resulting in no access to data. Checking the logs, everything is fine, the value changes, but unfortunately after getting the value. Thanks in advance for your help!

```
public class UserValid
{
    String typeOfAcc = "Podopieczni";
    FirebaseFirestore fStore;
    FirebaseAuth fAuth;
    DocumentReference documentReference;
    List itemList = new ArrayList<>();
    String userID;

    public UserValid()
    {
        Log.d("TAG", "Błąd, wybrano konstruktor bez argumentów");
    }

    //Metoda sprawdzająca jaki typ konta jest aktualnie obsługiwany
    // Jeśli wartość true - konto podopiecznego, wartość false - konto trenera;
    public UserValid(FirebaseAuth fAuth, FirebaseFirestore fStore)
    {
        userID = fAuth.getCurrentUser().getUid();
        this.fAuth = fAuth;
        this.fStore = fStore;
        documentReference = fStore.collection("Podopieczni").document(userID);

        readData(new FirestoreCallback()
        {
            @Override
            public void onCallback(List<String> list)
            {
                if(itemList.get(0) == null)
                {
                    typeOfAcc="Trenerzy";
                    Log.d("TAG", itemList.toString());

                }
            }
        });


    }
    private void readData(FirestoreCallback firestoreCallback)
    {
        //DocumentReference docRef = db.collection("cities").document("SF");
        documentReference.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
            @Override
            public void onComplete(@NonNull Task<DocumentSnapshot> task) {
                if (task.isSuccessful())
                {

                    //for(DocumentSnapshot document : task.getResult()) {
                        String itemName = task.getResult().getString("Imie");
                        itemList.add(itemName);

                   // }
                    firestoreCallback.onCallback(itemList);
                }
            }

        });
    }



    private interface FirestoreCallback
    {
        void onCallback(List<String> list);
    }
}
```

<string>[{"UserId":"1","Usercode":"ADMIN","Password":"123"},
{"UserId":"2","Usercode":"Ravi","Password":"ravi"}]</string>