I need a full-cycle Android application built from the ground up which shows ecg graph received from a hardware device and some other features. The core concept and feature set are still flexible, so I will lean on your insight to refine the architecture, choose the right tech stack (Kotlin or modern Java, Jetpack components, Material Design), and map out the release plan all the way to a Play Store submission. To move forward, share concise details of your Android experience—highlighting any apps now live in Google Play, the frameworks or libraries you prefer, and how you usually handle testing, backward compatibility, and ongoing maintenance. Deliverables will include: • Complete, well-commented source code in a Git repository • A signed, release-ready APK/AAB plus keystore instructions • Basic README or short video walkthrough explaining build and deployment steps If any questions come up around features, UI flow, or integration points, let’s discuss them early so the final build aligns with best practices and performs smoothly across current Android OS versions.