Android Studio – Reset button working and the counters are set to 0 but when I change the page or move the phone the value returns the same as before

I am developing a step counter app in Android Studio in Java, the counters are all working fine, I have added a button which would reset all the counters to 0, but when I click the reset button the counters are set to 0 but when I change the page or move the phone the value returns the same as before.

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Build;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationBarView;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import java.util.HashMap;
import java.util.Map;



public class MainActivity extends AppCompatActivity implements SensorEventListener {

    FirebaseAuth auth;
    TextView textViewSteps, textViewCalories, textViewMiles;
    FirebaseUser user;
    SensorManager sensorManager;
    FirebaseFirestore db;
    Button resetBtn;





    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        auth = FirebaseAuth.getInstance();
        db = FirebaseFirestore.getInstance();

        textViewSteps = findViewById(R.id.step_counter);
        textViewCalories = findViewById(R.id.calories);
        textViewMiles = findViewById(R.id.miles);
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        resetBtn = findViewById(R.id.resetBtn);

        user = auth.getCurrentUser();
        if (user == null) {
            Intent intent = new Intent(getApplicationContext(), Login.class);
            startActivity(intent);
            finish();
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (checkSelfPermission(Manifest.permission.BODY_SENSORS) != PackageManager.PERMISSION_GRANTED
                    || checkSelfPermission(Manifest.permission.ACTIVITY_RECOGNITION) != PackageManager.PERMISSION_GRANTED
                    || checkSelfPermission(Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[]{Manifest.permission.BODY_SENSORS, Manifest.permission.ACTIVITY_RECOGNITION, Manifest.permission.READ_CALENDAR}, 1);
            }
        }

        BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_nav);

        bottomNavigationView.setSelectedItemId(R.id.home);

        bottomNavigationView.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                switch (menuItem.getItemId()) {
                    case R.id.home:
                        return true;
                    case R.id.health:
                        startActivity(new Intent(getApplicationContext()
                                , Health.class));
                        overridePendingTransition(0, 0);
                        return true;
                    case R.id.rewards:
                        startActivity(new Intent(getApplicationContext()
                                , Reward.class));
                        overridePendingTransition(0, 0);
                        return true;
                    case R.id.profile:
                        startActivity(new Intent(getApplicationContext()
                                , Profile.class));
                        overridePendingTransition(0, 0);
                        return true;

                }
                return false;
            }
        });

        resetBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                reset();
            }
        });

        
        DocumentReference countersDocRef = db.collection("CounterDetails").document(user.getUid());
        countersDocRef.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
            @Override
            public void onSuccess(DocumentSnapshot documentSnapshot) {
                if (documentSnapshot.exists()) {
                    int savedSteps = documentSnapshot.getLong("steps").intValue();
                    double savedCalories = documentSnapshot.getDouble("calories");
                    double savedMiles = documentSnapshot.getDouble("miles");
                    textViewSteps.setText(String.valueOf(savedSteps));
                    textViewCalories.setText(String.format("%.2f Kcal", savedCalories));
                    textViewMiles.setText(String.format("%.2f Miles", savedMiles));
                } else {
                  
                    reset();
                }
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Toast.makeText(getApplicationContext(), "Error retrieving saved data: " + e.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }









    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 1) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
                    && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "Permissions granted!", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "Permissions denied!", Toast.LENGTH_SHORT).show();
            }
        }
    }


    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_STEP_COUNTER) {
            int newSteps = (int) event.values[0];
            double calories = newSteps * 0.04;
            double miles = newSteps * 0.0005;
            textViewSteps.setText(String.valueOf(newSteps));
            textViewCalories.setText(String.format("%.2f Kcal", calories));
            textViewMiles.setText(String.format("%.2f Miles", miles));

            db = FirebaseFirestore.getInstance();
            DocumentReference countersDocRef = db.collection("CounterDetails").document(user.getUid());

            Map<String, Object> data = new HashMap<>();
            data.put("steps", newSteps);
            data.put("calories", calories);
            data.put("miles", miles);

            countersDocRef.set(data)
                    .addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Toast.makeText(getApplicationContext(), "Error Saving Data: " + e.getMessage(), Toast.LENGTH_SHORT).show();
                        }
                    });
        }
    }





    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }

    @Override
    protected void onResume() {
        super.onResume();
        Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
        if (countSensor != null) {
            sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_UI);
        } else {
            Toast.makeText(this, "Sensor not found", Toast.LENGTH_SHORT).show();
        }
        db = FirebaseFirestore.getInstance();
        user = FirebaseAuth.getInstance().getCurrentUser();
    }





    @Override
    protected void onPause() {
        super.onPause();
        sensorManager.unregisterListener(this);
    }

    public void reset() {
        db.collection("CounterDetails").document(user.getUid())
                .update("steps", 0, "calories", 0, "miles", 0)
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {
                        Toast.makeText(getApplicationContext(), "Counter reset successful", Toast.LENGTH_SHORT).show();
                        
                        textViewSteps.setText("0");
                        textViewCalories.setText("0 Kcal");
                        textViewMiles.setText("0 Miles");
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(getApplicationContext(), "Error resetting counter: " + e.getMessage(), Toast.LENGTH_SHORT).show();
                    }
                });
    }



}