Contact person: Business Client

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Location: Cuttack, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I would like a clean, reliable calculator built specifically for Android. The goal is a lightweight APK that installs quickly, opens instantly, and performs every core arithmetic function without lag or crashing on current Android versions.

Here is what I need delivered:
• Fully functional calculator interface coded in Java or Kotlin, adhering to current Android Studio best-practices.
• Material-style UI with clear buttons, large display field, and responsive layouts that look tidy on phones and tablets.
• Smooth handling of user input, real-time result updates, and graceful error checks (division by zero, malformed entries, etc.).
• A signed, ready-to-publish APK plus all project source files and build instructions so I can compile future updates myself.

If you can add smart touches—theme switching, dark mode, haptic feedback—let me know, but solid core functionality is the priority." (client-provided description)