Sinewave Breathing Android App

⚠️ Licensing Notice: This project is Source Available for evaluation and portfolio review purposes only. It is not an Open Source project. Graphical assets, compiled binaries, and third-party framework dependencies have been excluded from this repository. Please refer to the LICENSE file for full terms.

What is Sinewave Breathing?

An Android application designed to guide users through mathematically-optimized breathing (0.02 Hz - 0.135 Hz). The goal is to reach the baroreflex resonant frequency (~0.1 Hz) to maximize heart rate variability (HRV) and induce deep relaxation.

Key Features (Logic Included)

• Precision Controls: Frequency adjustment down to increments.
• Sync Engine: Logic for synchronizing Lottie animations, Haptic feedback, and SoundPool audio cues.
• Session Management: Configurable timers and persistent user preferences.
• Phase Alignment: Calculations for 8-phase breath cycle triggers.

Repository Structure

File	Description
MainActivity.java	Core breathing logic and session state management.
SettingsFragment.java	Configuration logic for user preferences.
SettingsActivity.java	Container for the settings UI.

Excluded Proprietary Assets: XML Layouts, Lottie JSON files, .raw audio files, and Gradle build scripts.

Technical Context

The code demonstrates implementation of:

• SoundPool for low-latency rhythmic cues.
• SharedPreferences for session persistence.
• CountDownTimer for precise breathing intervals.

License & Contact

License: Open Review Only (See LICENSE.md).

Developer: Sinewave Lab (Micael Nobre).