Android Studio Developer

I'll create a comprehensive Personal Finance Tracker app. Let's break it down into key components. 1. First, let's create the data models: ```java // Transaction.java public class Transaction { private String id; private double amount; private String category; private String description; private long date; private String type; // INCOME or EXPENSE private String userId; public Transaction() { // Required for Firebase } public Transaction(double amount, String category, String description, String type) { this.id = UUID.randomUUID().toString(); this.amount = amount; this.category = category; this.description = description; this.date = System.currentTimeMillis(); this.type = type; } // Getters and setters } // Budget.java public class Budget { private String id; private String category; private double limit; private double spent; private String period; // MONTHLY or WEEKLY private String userId; // Constructor and getters/setters } // SavingsGoal.java public class SavingsGoal { private String id; private String name; private double targetAmount; private double currentAmount; private long targetDate; private String userId; // Constructor and getters/setters } ``` 2. Create the main activity with bottom navigation: ```xml <!-- activity_main.xml --> <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <androidx.fragment.app.FragmentContainerView android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="0dp" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toTopOf="@id/bottom_navigation" app:defaultNavHost="true" app:navGraph="@navigation/nav_graph" /> <com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/bottom_navigation" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_constraintBottom_toBottomOf="parent" app:menu="@menu/bottom_nav_menu" /> </androidx.constraintlayout.widget.ConstraintLayout> ``` 3. Create the Dashboard Fragment: ```java public class DashboardFragment extends Fragment { private PieChart expenseChart; private LineChart balanceChart; private RecyclerView recentTransactionsView; private TransactionsAdapter adapter; private FirebaseFirestore db; private String userId; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_dashboard, container, false); initializeViews(view); setupCharts(); loadTransactions(); return view; } private void setupCharts() { // Setup Pie Chart expenseChart.setUsePercentValues(true); expenseChart.getDescription().setEnabled(false); expenseChart.setDrawHoleEnabled(true); expenseChart.setHoleColor(Color.WHITE); expenseChart.setTransparentCircleRadius(61f); // Setup Line Chart balanceChart.getDescription().setEnabled(false); balanceChart.setDrawGridBackground(false); balanceChart.getXAxis().setPosition(XAxis.XAxisPosition.BOTTOM); balanceChart.getAxisRight().setEnabled(false); } private void loadTransactions() { db.collection("transactions") .whereEqualTo("userId", userId) .orderBy("date", Query.Direction.DESCENDING) .limit(10) .addSnapshotListener((value, error) -> { if (error != null) { showError("Error loading transactions"); return; } List<Transaction> transactions = new ArrayList<>(); for (QueryDocumentSnapshot doc : value) { transactions.add(doc.toObject(Transaction.class)); } updateDashboard(transactions); }); } private void updateDashboard(List<Transaction> transactions) { updatePieChart(transactions); updateLineChart(transactions); adapter.setTransactions(transactions); } } ``` 4. Create the Add Transaction Dialog: ```java public class AddTransactionDialog extends BottomSheetDialogFragment { private EditText amountEdit, descriptionEdit; private Spinner categorySpinner; private RadioGroup typeGroup; private Button saveButton; private FirebaseFirestore db; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.dialog_add_transaction, container, false); initializeViews(view); setupSpinner(); saveButton.setOnClickListener(v -> saveTransaction()); return view; } private void saveTransaction() { String amount = amountEdit.getText().toString(); String description = descriptionEdit.getText().toString(); String category = categorySpinner.getSelectedItem().toString(); String type = typeGroup.getCheckedRadioButtonId() == R.id.radio_expense ? "EXPENSE" : "INCOME"; if (!validateInput(amount, description)) { return; } Transaction transaction = new Transaction( Double.parseDouble(amount), category, description, type ); db.collection("transactions") .add(transaction) .addOnSuccessListener(documentReference -> dismiss()) .addOnFailureListener(e -> showError("Failed to save transaction")); } } ``` 5. Create the Budget Management Fragment: ```java public class BudgetFragment extends Fragment { private RecyclerView budgetList; private BudgetAdapter adapter; private FirebaseFirestore db; private FloatingActionButton addBudgetFab; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_budget, container, false); initializeViews(view); loadBudgets(); addBudgetFab.setOnClickListener(v -> showAddBudgetDialog()); return view; } private void loadBudgets() { db.collection("budgets") .whereEqualTo("userId", FirebaseAuth.getInstance().getCurrentUser().getUid()) .addSnapshotListener((value, error) -> { if (error != null) { showError("Error loading budgets"); return; } List<Budget> budgets = new ArrayList<>(); for (QueryDocumentSnapshot doc : value) { budgets.add(doc.toObject(Budget.class)); } adapter.setBudgets(budgets); }); } } ``` 6. Create the Savings Goals Fragment: ```java public class SavingsGoalsFragment extends Fragment { private RecyclerView goalsList; private SavingsGoalAdapter adapter; private FirebaseFirestore db; private FloatingActionButton addGoalFab; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_savings_goals, container, false); initializeViews(view); loadSavingsGoals(); addGoalFab.setOnClickListener(v -> showAddGoalDialog()); return view; } private void loadSavingsGoals() { db.collection("savings_goals") .whereEqualTo("userId", FirebaseAuth.getInstance().getCurrentUser().getUid()) .addSnapshotListener((value, error) -> { if (error != null) { showError("Error loading savings goals"); return; } List<SavingsGoal> goals = new ArrayList<>(); for (QueryDocumentSnapshot doc : value) { goals.add(doc.toObject(SavingsGoal.class)); } adapter.setGoals(goals); }); } } ``` 7. Add notification service for bill reminders: ```java public class ReminderService extends Service { private static final int NOTIFICATION_ID = 1001; private FirebaseFirestore db; private Handler handler; private static final long CHECK_INTERVAL = TimeUnit.HOURS.toMillis(24); @Override public int onStartCommand(Intent intent, int flags, int startId) { handler = new Handler(); startPeriodicCheck(); return START_STICKY; } private void startPeriodicCheck() { handler.postDelayed(new Runnable() { @Override public void run() { checkUpcomingBills(); handler.postDelayed(this, CHECK_INTERVAL); } }, CHECK_INTERVAL); } private void checkUpcomingBills() { // Check for upcoming bills and create notifications } } ``` To complete the app, you'll need: 1. Add Firebase dependencies: ```gradle dependencies { implementation 'com.google.firebase:firebase-firestore:24.0.0' implementation 'com.google.firebase:firebase-auth:21.0.0' implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0' implementation 'com.google.android.material:material:1.5.0' } ``` 2. Set up Firebase Authentication and Firestore rules: ```javascript rules_version = '2'; service cloud.firestore { match /databases/{database}/documents { match /{document=**} { allow read, write: if request.auth != null && request.auth.uid == resource.data.userId; } } } ``` Would you like me to explain any specific part of the implementation or provide additional features?