How I Built a 1.1 MB Android Utility to Replace Broken Physical Volume Buttons

Every year, thousands of Android devices suffer from the exact same hardware failure: broken, jammed, or unresponsive physical volume rockers.

Repairing them often requires opening the phone body, costing anywhere from $40 to $100. Most assistive touch apps in the market solve this poorly by placing permanent, screen-blocking floating bubbles that drain battery and trigger accidental clicks.

I decided to solve this natively: I built Gesture Volume — an ultra-lightweight (1.1 MB), privacy-first Android system utility built with modern Android standards.

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🛠️ The Architecture & Engineering Highlights

1. Unobtrusive Frosted Edge Handle:
   Instead of a floating bubble, it sits at a compact 1/3 idle size (~7dp width, ~40dp height) tucked flush against your screen edge. When touched, it expands into a full slider.

2. Native WindowManager Overlay via Accessibility:
   Renders using WindowManager.LayoutParams.TYPE_ACCESSIBILITY_OVERLAY to float smoothly over any running app, fullscreen game, YouTube, or Netflix.

   • canRetrieveWindowContent = false (Zero window scraping, no keystroke monitoring).
   • Zero internet permissions in the manifest (android.permission.INTERNET is completely absent).

3. Event-Driven & Zero Idle Battery Drain:
   No background polling loops or wakelocks. Touch events map directly to AudioManager.STREAM_MUSIC with subtle haptic feedback (VIBRATOR_MANAGER).

4. 100% Modern Jetpack Compose UI:
   The companion dashboard, gesture testing sandbox, and settings are built purely in Jetpack Compose + Material 3, optimized via R8 ProGuard down to just 1.1 MB.

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🚀 Try It or Support the Project

• 🛒 Gumroad (Direct Standalone APK): https://khalidabdullahh.gumroad.com/l/ebwxyg
• 🌐 Interactive Web Simulator: https://khalidabdullahh.github.io/GestureVolume/
• ☕ Open-Source Repo: https://github.com/khalidabdullahh/GestureVolume

I'd love to hear your feedback on the UX and architecture!