android_xml_mvvm_arch.kt

// UserViewModel.kt
class UserViewModel(private val repository: UserRepository) : ViewModel() {
    private val _users = MutableLiveData<Resource<List<User>>>()
    val users: LiveData<Resource<List<User>>> = _users
    fun loadUsers() {
        viewModelScope.launch {
            _users.value = Resource.Loading()
            _users.value = repository.getUsers()
        }
    }
}

// UserRepository.kt
class UserRepository(private val apiService: ApiService) {
    suspend fun getUsers(): Resource<List<User>> {
        return try {
            Resource.Success(apiService.getUsers())
        } catch (e: Exception) {
            Resource.Error(e.message ?: "Unknown error")
        }
    }
}

// MainActivity.kt
class MainActivity : AppCompatActivity() {
    private val viewModel: UserViewModel by viewModels()
    private lateinit var adapter: UserAdapter
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        setupRecyclerView()
        observeViewModel()
        viewModel.loadUsers()
    }

    private fun observeViewModel() {
        viewModel.users.observe(this) { resource ->
            when (resource) {
                is Resource.Loading -> showLoading()
                is Resource.Success -> adapter.submitList(resource.data)
                is Resource.Error -> showError(resource.message)
            }
        }
    }
}