Expense Tracker App (Offline)

Flutter app with local SQLite storage and local notifications.

Stack

• Flutter
• SQLite via sqflite
• State management via provider
• Local reminders via flutter_local_notifications

Features Implemented

• Expense tracker
  • Amount
  • Category
  • Payment type (Cash/Online)
  • Date
  • Optional comment
• Monthly income and summary
  • First-day income prompt if missing
  • Income/expense/balance overview
  • Highest spending category
  • Daily average spending
  • Budget warning when spending reaches 70% of monthly income
• Task scheduler
  • Add task with deadline
  • Optional reminder notification
  • Mark complete
  • Carry-forward incomplete tasks
• Productivity extras
  • Dark mode toggle (from dashboard)
  • Export current month expenses to CSV from Expenses screen

Database Tables

• expenses(id, amount, category, payment_type, date, comment)
• income(id, month, year, amount)
• tasks(id, title, description, deadline, is_completed, reminder_time)

Indexes:

• idx_expenses_date
• idx_expenses_category

Project Structure

lib/
 ├── main.dart
 ├── core/
 │    ├── database/db_helper.dart
 │    ├── models/
 │    │     ├── expense_model.dart
 │    │     ├── income_model.dart
 │    │     └── task_model.dart
 │    └── services/notification_service.dart
 ├── features/
 │    ├── dashboard/dashboard_screen.dart
 │    ├── expenses/
 │    │     ├── add_expense_screen.dart
 │    │     └── expense_list.dart
 │    ├── summary/monthly_summary_screen.dart
 │    └── tasks/task_screen.dart
 └── providers/
      ├── expense_provider.dart
      └── task_provider.dart

Setup

1. Install Flutter SDK and Android Studio.
2. In this project folder run:

flutter create .
flutter pub get
flutter run

Build APK

flutter build apk --release

Output:

build/app/outputs/flutter-apk/app-release.apk

Play Store Readiness (Android)

1) Set your final app identity

• Update applicationId and namespace in android/app/build.gradle.kts from com.example... to your own reverse-domain ID.
• Move MainActivity.kt package path if you change the namespace.

2) Configure release signing

• Create android/key.properties (do not commit it):

storePassword=YOUR_STORE_PASSWORD
keyPassword=YOUR_KEY_PASSWORD
keyAlias=upload
storeFile=../upload-keystore.jks

• Keep your keystore file safe (example: android/upload-keystore.jks).

3) Build App Bundle for Play Store

flutter clean
flutter pub get
flutter build appbundle --release

Output:

build/app/outputs/bundle/release/app-release.aab

4) Production checklist before uploading

• Replace default launcher icon and app name if needed.
• Verify notification behavior on Android 13+ (runtime notification permission).
• Update version in pubspec.yaml for each release.
• Test install and upgrade path using release builds.
• Complete Play Console listing (privacy policy, screenshots, content rating, data safety form).

Files to preserve if you delete this project folder

• lib/
• pubspec.yaml
• pubspec.lock
• README.md
• android/key.properties (private)
• Your keystore file (*.jks / *.keystore, private)
• android/app/google-services.json if you add Firebase later
• ios/Runner/GoogleService-Info.plist if you add Firebase later