BMI Gauge App 📱

An Android application that calculates and visualizes your Body Mass Index (BMI) based on your height and weight using a custom animated gauge.

🔍 Features

• Input fields for:
  • Height (cm)
  • Weight (kg)
  • Age
• Calculates and displays your BMI value.
• Custom BMI gauge (BmiGaugeView) drawn using Canvas.
• Visually categorized BMI results:
  • 🔵 Underweight (Blue)
  • 🟢 Normal (Green)
  • 🔴 Overweight (Red)
• Displays BMI score as BMI: 22.0 above the gauge.
• Age input is included for potential future use (e.g., personalized recommendations).

🧠 What is BMI?

Body Mass Index (BMI) is a number derived from a person's weight and height. It's a simple index used to classify underweight, normal weight, and overweight individuals.

BMI = weight (kg) / (height (m))²

BMI Categories

Category	BMI Range
Underweight	Less than 18.5
Normal	18.5 – 24.9
Overweight	25.0 and above

🧩 Tech Stack

• Language: Kotlin
• UI: ConstraintLayout
• Graphics: Custom View using Canvas
• Min SDK: 21 (Android 5.0)

📸 Screenshots

🛠 How to Build

1. Clone the repository:

   git clone https://github.com/YEmrehan/Android-BMI-Calculator.git

2. Open the project in Android Studio.
3. Click Run to build and launch the app on an emulator or physical device.

🗂 Project Structure

com.example.bmi
├── MainActivity.kt        // Main UI logic
├── BmiGaugeView.kt        // Custom View for BMI Gauge
└── res/layout/activity_main.xml

💡 Custom Gauge Logic

The BmiGaugeView class uses Canvas to draw:

• A partial circular arc with segments for different BMI ranges.
• A needle pointing to the current BMI.
• A floating text label with the BMI score.

canvas.drawText(bmiText, centerX, centerY - radius - 60, textPaint)

🤝 Contributions

Pull requests are welcome! If you find a bug or want to suggest a feature, feel free to open an issue.

📄 License

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

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Made with ❤️ using Kotlin.