This app is designed to communicate with Arduino via Bluetooth, display Google Maps on the UI using the Google Map SDK, and send data calculated within the app to a Cloud server.
The app counts the time in seconds from when it receives the Bluetooth data string "hello" until Arduino stops sending data within 3 seconds and then sends this data to a Cloud server, Firebase.
The architecture follows the MVVM pattern, utilizing only the UI layer and consisting of two modules: app and ui.
The app module is the entry point, while the ui module is a library module.
My initial goal was to adhere to the architecture recommended by Android (UI - domain - data), similar to Clean Architecture, although Android officially states that the two are different.
However, I first created only the ui module as a prototype.
The following list outlines the core frameworks, libraries, and APIs used in this app:
- Dagger-Hilt for Dependency Injection (DI).
- KSP instead of Kapt for faster builds.
- Google Services for Google Map SDK in Google Cloud.
- Jetpack Compose for UI Design with Material3 and Navigation.
The app requires permissions for Bluetooth communication, Internet access, device location, and notifications.
These permissions are specified in the manifest file in the app module as requirements.
I injected the ViewModel into the MainActivity to receive data from the Bluetooth adapter. As I built the code, I encountered the biggest problem in this project. The first issue was that I omitted the package name in the ViewModel file, so MainActivity didn't recognize the ViewModel. However, I didn't realize this and added "androidx.hilt:hilt-lifecycle-viewmodel", which is no longer required for the updated version of Hilt since 2.31. This caused serious conflicts with other dependencies, resulting in a compile error. Even after discovering the initial issue of omitting the package name, I could not identify the second problem, spending 5 hours before finally finding it.