📱 Calculator - All-in-One Android Tool

A comprehensive, all-in-one Android calculator application built with Kotlin. This app goes beyond simple arithmetic, providing a suite of specialized tools for geometry, unit conversion, health, finance, and more.

⬇️ Download Latest APK

---

🚀 Features

🔢 General Calculator

• Basic Operations: Addition, subtraction, multiplication, and division.
• Scientific functions: Trigonometry (Sin, Cos, Tan), Hyperbolic functions, and Analysis.
• Constants: Access to common mathematical constants and number theory tools.

📐 Geometry Calculator

• Calculate Area, Perimeter, Volume, and Surface Area for various shapes:
  • 2D Shapes: Circle, Square, Triangle, Rectangle, Sector, Regular Polygon.
  • 3D Shapes: Sphere, Cylinder, Pyramid, Prism, Cone.
• Visual Preview: Real-time geometry preview and coordinate system visualization using custom views (GeometryPreviewView, CoordinateSystemView).

🔄 Unit Converter

• Common: Length, Area, Weight, Volume, Temperature, Time.
• Science/Engineering: Angle, Speed, Pressure, Force, Energy, Optics.
• Digital: Data Storage (B, KB, MB, GB, etc.).
• Finance: Real-time Currency Converter with live exchange rate updates via OkHttp.
• Electrical: Various electric units.

🛠️ Special Calculators

• Health: BMI (Body Mass Index) and BMR (Basal Metabolic Rate).
• Finance: Discount and Loan/Mortgage calculators.
• Lifestyle: Tip calculator (with bill splitting), Fuel cost/efficiency, and Unit Price comparison.
• Mathematics:
  • Sigma (Σ): Summation calculator with custom expressions.
  • Combinatorics: Permutations (P), Combinations (C), and Repetition Combinations (H).
  • Base Converter: Decimal, Binary, and Hexadecimal.
  • Number Info: Quick insights into number properties.
• Utility: World Clock for timezone conversions.

📝 Math Notepad

• Manage your calculations with a built-in notebook system to save and organize math notes.

---

🛠️ Technical Stack

• Language: Kotlin
• UI Framework: XML with ConstraintLayout and Material Components.
• Networking: OkHttp for fetching real-time currency rates.
• Concurrency: Kotlin Coroutines.
• Security: Conscrypt for modern TLS 1.2+ support on Android 5.0.
• Compatibility: Android 5.0 (API 21) and above.

---

🏗️ Project Structure

• :app - Main Android application module.
  • com.liferlighdow.calculator - Base package.
  • GeometryPreviewView.kt / CoordinateSystemView.kt - Custom drawing components.
  • MainActivity.kt - Main entry point and basic calculator.
  • SpecialCalculatorsActivity.kt - Host for specialized calculation tools.

---

⚙️ Build Requirements

1. Android Studio: Ladybug (2024.2.1) or newer recommended.
2. JDK: 11 or higher.
3. Android SDK: Compile SDK 36.

How to Build

# Clone the repository
git clone https://github.com/LiferLighdow/Calculator.git

# Navigate to directory
cd Calculator

# Build the APK
./gradlew assembleDebug

---

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

Developed with ❤️ by LiferLighdow