A clean, offline-first To-Do List Android app built with Room Database, Hilt and MVVM Architecture — following modern Android development practices.
ToDoApp is a minimal task manager that lets you add, edit, complete, and delete tasks — all stored locally on your device. No login, no cloud, no fluff. Built to understand how Room, Hilt and MVVM work together in a real Android project.
- Add Tasks — Create new tasks via a bottom sheet
- Edit Tasks — Update any existing task inline
- Complete Tasks — Check off tasks with a strikethrough style
- Delete Tasks — Remove tasks with a single tap
- Task Counter — See how many tasks are remaining on the home screen
- Offline First — All data stored locally with Room. No account needed.
| Home | Add Task | Update Task |
|---|---|---|
 |
 |
 |
This app follows the MVVM (Model-View-ViewModel) pattern, wired together with Hilt instead of manual factories:
UI (Composables)
↕ collects StateFlow
ViewModel (@HiltViewModel)
↕ calls functions
Repository (constructor-injected)
↕ queries
Room Database (DAO → Entity)
↑
Hilt AppModule provides Database + DAO as singletons
| Layer | Responsibility |
|---|---|
| Entity | Defines the Task data model / table schema |
| DAO | SQL operations — insert, update, delete, getAll |
| Database | Room database, provided as a Hilt singleton |
| Repository | Bridges DAO and ViewModel, single source of truth, constructor-injected |
| ViewModel | @HiltViewModel, exposes StateFlow to UI, survives configuration changes |
| UI | Collects StateFlow and renders the task list, gets its ViewModel via hiltViewModel() |
| Layer | Technology |
|---|---|
| Language | Kotlin |
| UI | Jetpack Compose |
| Architecture | MVVM |
| Local DB | Room |
| Dependency Injection | Hilt |
| Async | Coroutines |
com.example.todoapp/
├── data/
│ └── room_database/
│ ├── TaskDao.kt
│ ├── TaskDatabase.kt
│ └── TaskItem.kt
├── di/
│ └── AppModule.kt
├── repository/
│ └── TaskRepository.kt
├── ui/
│ ├── screens/
│ │ ├── TaskEditor.kt
│ │ ├── TasksScreen.kt
│ │ └── ToDoItem.kt
│ └── theme/
│ ├── Color.kt
│ ├── Theme.kt
│ └── Type.kt
├── viewmodel/
│ └── TaskViewModel.kt
├── ToDoApplication.kt
└── MainActivity.kt
git clone https://github.com/Vanshika-Tanwar/ToDoApp.gitOpen in Android Studio, let Gradle sync, and run.
- How Room Database works — Entities, DAOs, and the Database singleton
- Repository pattern as a single source of truth between DAO and ViewModel
- ViewModel surviving configuration changes while keeping UI clean
- StateFlow for reactive UI updates without manual refresh
- Running database operations off the main thread using Coroutines
- Dependency injection with Hilt - replacing a manual ViewModelFactory with @HiltAndroidApp, @AndroidEntryPoint, @HiltViewModel, and constructor injection across the Repository and DAO layers