This capstone ties together every module: Retrofit for a movie API, Room for offline caching, a Repository unifying both, a ViewModel exposing sealed-class UI state, and a ListAdapter with DiffUtil displaying results.

class MovieViewModel(private val repository: MovieRepository) : ViewModel() {
    private val _uiState = MutableLiveData<NetworkResult<List<Movie>>>()
    val uiState: LiveData<NetworkResult<List<Movie>>> = _uiState

    fun loadPopularMovies() {
        _uiState.value = NetworkResult.Loading
        viewModelScope.launch {
            _uiState.value = repository.getPopularMovies()
        }
    }
}

viewModel.uiState.observe(viewLifecycleOwner) { state ->
    when (state) {
        is NetworkResult.Loading -> binding.progressBar.isVisible = true
        is NetworkResult.Success -> {
            binding.progressBar.isVisible = false
            movieAdapter.submitList(state.data)
        }
        is NetworkResult.Error -> {
            binding.progressBar.isVisible = false
            Snackbar.make(binding.root, state.message, Snackbar.LENGTH_LONG).show()
        }
    }
}

This is the shape of a genuinely production-style Android screen — every layer from Module 1 through Module 5 is represented here.