在Firebase中将数据存储到实时数据库

Question

我是Android Studio的新手，我需要有多个节点才能在Firebase中存储数据，我目前有一个用于存储登录信息的用户节点，但是我需要一个节点来设置预算。这是我目前为.java以及getter和setter编写的代码。我希望用户为每个类别输入一个金额，然后将其保存到他们的个人资料中，以便以后可以将他们的实际支出与设定的预算进行比较。

   package com.example.traktrail;

    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.Toast;

    import androidx.appcompat.app.AppCompatActivity;

    import com.google.firebase.auth.FirebaseAuth;
    import com.google.firebase.database.DatabaseReference;
    import com.google.firebase.database.FirebaseDatabase;

    import static com.google.firebase.auth.FirebaseAuth.getInstance;

    public class Categories extends AppCompatActivity {
    private FirebaseAuth firebaseAuth;
    DatabaseReference mDatabase;
    EditText travel_input, entertainment_input, fitness_input, beauty_input, clothes_input, 
    holiday_input, food_input, mobile_input;
    Double travel_budget, entertainment_budget, fitness_budget, beauty_budget, clothes_budget, 
    holiday_budget, food_budget, mobile_budget;
    Button btn_subCat;

    FirebaseDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_categories);
        setupUIViews();
        firebaseAuth = getInstance();
        mDatabase = FirebaseDatabase.getInstance().getReference();

        btn_subCat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(validate()){
                    sendUserBudgets();
                    Toast.makeText(Categories.this, "Completed!", Toast.LENGTH_LONG).show();
                    finish();
                    startActivity(new Intent(Categories.this, Menu.class ));
                }else{
                    Toast.makeText(Categories.this, "Submission failed", Toast.LENGTH_LONG).show();
                }
            }
        });
    }
    private void setupUIViews() {
        travel_input = (EditText)findViewById(R.id.travel_input);
        entertainment_input = (EditText)findViewById(R.id.entertainment_input);
        fitness_input = (EditText)findViewById(R.id.fitness_input);
        beauty_input = (EditText)findViewById(R.id.beauty_input);
        clothes_input = (EditText)findViewById(R.id.clothes_input);
        holiday_input = (EditText)findViewById(R.id.holiday_input);
        food_input = (EditText)findViewById(R.id.food_input);
        mobile_input = (EditText)findViewById(R.id.mobile_input);
        btn_subCat = (Button)findViewById(R.id.btn_subCat);

    }

    private Boolean validate() {
        boolean result = false;
        travel_budget = Double.parseDouble(travel_input.getText().toString().trim());
        entertainment_budget = Double.parseDouble(entertainment_input.getText().toString().trim());
        fitness_budget = Double.parseDouble(fitness_input.getText().toString().trim());
        beauty_budget = Double.parseDouble(beauty_input.getText().toString().trim());
        clothes_budget = Double.parseDouble(clothes_input.getText().toString().trim());
        holiday_budget = Double.parseDouble(holiday_input.getText().toString().trim());
        food_budget = Double.parseDouble(food_input.getText().toString().trim());
        mobile_budget = Double.parseDouble(mobile_input.getText().toString().trim());

        if(travel_budget.equals(null) || entertainment_budget.equals(null) || fitness_budget.equals(null) 
        || beauty_budget.equals(null) || clothes_budget.equals(null) || holiday_budget.equals(null) || 
        food_budget.equals(null) ||
                mobile_budget.equals(null)){
            Toast.makeText(Categories.this, "Please enter all fields", Toast.LENGTH_LONG).show();
        } else {
            result = true;
        }
        return result;
    }

    private void sendUserBudgets() {
        String currentUserID = firebaseAuth.getUid();
        CategoriesDB catDb = new CategoriesDB(travel_budget, entertainment_budget, fitness_budget, 
    beauty_budget, clothes_budget, holiday_budget, food_budget, mobile_budget);
        mDatabase.child("User").child(currentUserID).child("Budgets").setValue(catDb);
    }



  package com.example.traktrail;

   import android.content.Intent;
   import android.os.Bundle;
   import android.view.View;
   import android.widget.Button;
   import android.widget.EditText;
   import android.widget.Toast;

    import androidx.appcompat.app.AppCompatActivity;

    import com.google.firebase.auth.FirebaseAuth;
    import com.google.firebase.database.DatabaseReference;
    import com.google.firebase.database.FirebaseDatabase;

    import static com.google.firebase.auth.FirebaseAuth.getInstance;

    public class Categories extends AppCompatActivity {
    private FirebaseAuth firebaseAuth;
    DatabaseReference mDatabase;
    EditText travel_input, entertainment_input, fitness_input, beauty_input, clothes_input, 
    holiday_input, food_input, mobile_input;
    Double travel_budget, entertainment_budget, fitness_budget, beauty_budget, clothes_budget, 
    holiday_budget, food_budget, mobile_budget;
    Button btn_subCat;

    FirebaseDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_categories);
        setupUIViews();
        firebaseAuth = getInstance();
        mDatabase = FirebaseDatabase.getInstance().getReference();

        btn_subCat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(validate()){
                    sendUserBudgets();
                    Toast.makeText(Categories.this, "Completed!", Toast.LENGTH_LONG).show();
                    finish();
                    startActivity(new Intent(Categories.this, Menu.class ));
                }else{
                    Toast.makeText(Categories.this, "Submission failed", Toast.LENGTH_LONG).show();
                }
            }
        });
    }
    private void setupUIViews() {
        travel_input = (EditText)findViewById(R.id.travel_input);
        entertainment_input = (EditText)findViewById(R.id.entertainment_input);
        fitness_input = (EditText)findViewById(R.id.fitness_input);
        beauty_input = (EditText)findViewById(R.id.beauty_input);
        clothes_input = (EditText)findViewById(R.id.clothes_input);
        holiday_input = (EditText)findViewById(R.id.holiday_input);
        food_input = (EditText)findViewById(R.id.food_input);
        mobile_input = (EditText)findViewById(R.id.mobile_input);
        btn_subCat = (Button)findViewById(R.id.btn_subCat);

    }

    private Boolean validate() {
        boolean result = false;
        travel_budget = Double.parseDouble(travel_input.getText().toString().trim());
        entertainment_budget = Double.parseDouble(entertainment_input.getText().toString().trim());
        fitness_budget = Double.parseDouble(fitness_input.getText().toString().trim());
        beauty_budget = Double.parseDouble(beauty_input.getText().toString().trim());
        clothes_budget = Double.parseDouble(clothes_input.getText().toString().trim());
        holiday_budget = Double.parseDouble(holiday_input.getText().toString().trim());
        food_budget = Double.parseDouble(food_input.getText().toString().trim());
        mobile_budget = Double.parseDouble(mobile_input.getText().toString().trim());

        if(travel_budget.equals(null) || entertainment_budget.equals(null) || fitness_budget.equals(null) 
    || beauty_budget.equals(null) || clothes_budget.equals(null) || holiday_budget.equals(null) || 
    food_budget.equals(null) ||
                mobile_budget.equals(null)){
            Toast.makeText(Categories.this, "Please enter all fields", Toast.LENGTH_LONG).show();
        } else {
            result = true;
        }
        return result;
    }

    private void sendUserBudgets() {
        String currentUserID = firebaseAuth.getUid();
        CategoriesDB catDb = new CategoriesDB(travel_budget, entertainment_budget, fitness_budget, 
    beauty_budget, clothes_budget, holiday_budget, food_budget, mobile_budget);
        mDatabase.child("User").child(currentUserID).child("Budgets").setValue(catDb);
    }

    public void goBack(View view){startActivity(new Intent(Categories.this, Menu.class));}
    }

    getters and setters : 

    package com.example.traktrail;

    public class CategoriesDB {
    private Double travel_budget;
    private Double entertainment_budget;
    private Double fitness_budget;
    private Double beauty_budget;
    private Double clothes_budget;
    private Double holiday_budget;
    private Double food_budget;
    private Double mobile_budget;
    private String email_User;


    public CategoriesDB(Double travel_input, Double entertainment_input, Double fitness_input, Double 
    beauty_input, Double clothes_input, Double holiday_input, Double food_input, Double mobile_input, 
    String email){
        this.travel_budget = travel_input;
        this.entertainment_budget = entertainment_input;
        this.fitness_budget = fitness_input;
        this.beauty_budget = beauty_input;
        this.clothes_budget = clothes_input;
        this.holiday_budget = holiday_input;
        this.food_budget = food_input;
        this.mobile_budget = mobile_input;
        this.email_User = email;
    }

    public CategoriesDB(Double travel_budget, Double entertainment_budget, Double fitness_budget, Double 
    beauty_budget, Double clothes_budget, Double holiday_budget, Double food_budget, Double 
    mobile_budget) {

    }

    public Double getTravel_budget() { return travel_budget; }

    public void setTravel_budget(Double travel_budget) { this.travel_budget = travel_budget; }

    public Double getEntertainment_budget() { return entertainment_budget; }

    public void setEntertainment_budget(Double entertainment_budget) { this.entertainment_budget = 
    entertainment_budget; }

    public Double getFitness_budget() { return fitness_budget; }

    public void setFitness_budget(Double fitness_budget) { this.fitness_budget = fitness_budget; }

    public Double getBeauty_budget() { return beauty_budget; }

    public void setBeauty_budget(Double beauty_budget) { this.beauty_budget = beauty_budget; }

    public Double getClothes_budget() { return clothes_budget; }

    public void setClothes_budget(Double clothes_budget) { this.clothes_budget = clothes_budget; }

    public Double getHoliday_budget() { return holiday_budget; }

    public void setHoliday_budget(Double holiday_budget) { this.holiday_budget = holiday_budget; }

    public Double getFood_budget() { return food_budget; }

    public void setFood_budget(Double food_budget) { this.food_budget = food_budget; }

    public Double getMobile_budget() { return mobile_budget; }

    public void setMobile_budget(Double mobile_budget) { this.mobile_budget = mobile_budget; }

    public String getEmail_User() { return email_User; }

    public void setEmail_User(String email_User) { this.email_User = email_User; }
    }