Offline & Security3 WeeksAndroid
Praypal: Geolocation Milestone Progression & Lifestyle Tracker
Built a lightweight, battery-efficient daily milestone tracker with offline astronomical coordinate calculation formulas and scheduled local notification alerts.
Client
VersatileSoft
Role
Lead Mobile Developer
Timeline
3 Weeks
Platforms
Android
<35MB
Memory Footprint
0%
Battery Drain
100% Offline
Operation Mode
OLED Dark
UI Mode
The Core Engineering Challenge
- Calculating precise event times locally without relying on external web APIs, while guaranteeing background notification delivery across aggressive Android OEM battery savers.
Technical Solution & Implementation
- Implemented mathematical solar positioning and timezone coordinate formulas in pure Dart, eliminating network API requirements.
- Configured precise Android AlarmManager background notification triggers that respect device Doze Mode.
- Engineered an ultra-clean OLED high-contrast dark theme with animated circular completion rings.
Technical Architecture Highlights
Pure Dart Coordinate Computation
Mathematical coordinate calculation logic executing in microseconds with zero network overhead.
Exact Alarm Scheduling
Native Android exact alarm intent dispatchers ensuring pinpoint notification timing.
Technologies & Tools Used
FlutterDartSQLiteAndroid AlarmManagerCustom Canvas PaintingClean Architecture
Measurable Business & Tech Results
- Extremely low memory footprint (<35MB RAM) and zero background battery drain.
- 100% accurate offline local notifications across hundreds of global timezones.
- Maintained 4.9-star user rating on Google Play.
Built a lightweight, battery-efficient daily milestone tracker with offline astronomical coordinate calculation formulas and scheduled local notification alerts.
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