Example of using Easy.Api with Architecture components ViewModel and LiveData

UsersFragmentWithViewModel.kt

class UsersFragmentWithViewModel : BaseFragment<FragmentUsersBinding>() {

    private lateinit var adapter: UserListAdapter
    private lateinit var viewModel: UserViewModel

    override fun defineLayoutResource(): Int {
        return R.layout.fragment_users
    }

    override fun initializeComponent(view: View) {

        viewModel = ViewModelProviders.of(this).get(UserViewModel::class.java)

        adapter = UserListAdapter()
        binding.rvUsers.adapter = adapter

        fetchUsers()
        
        viewModel.usersLiveData.observe(this, Observer<List<User>> { users ->
              if (users != null && users.isNotEmpty()) {
                hideLoading()
                adapter.setUserList(users)
              }
              binding.executePendingBindings()
            })
        
        viewModel.loadingStateLiveData.observe(this, Observer<STATE> { state1 ->
              state1?.let {
                when (it) {
                  STATE.SHOW_LOADING -> showLoading()
                  STATE.HIDE_LOADING -> hideLoading()
                  STATE.ERROR -> showError("")
                  STATE.NO_INTERNET -> showNoInternet()
                }
              }
            })
    }
}

UserViewModel.kt

class UserViewModel(application: Application) : AndroidViewModel(application) {
    val usersLiveData: MediatorLiveData<List<User>>
    private var usersListApi: EasyApiCall<Envelop<List<User>>>? = null
    val loadingStateLiveData: MutableLiveData<STATE> = MutableLiveData()
    
    init {
        // initialize live data
        usersLiveData = MediatorLiveData()
        // set by default null
        usersLiveData.value = null
        
        usersListApi = Builder<Envelop<List<User>>>(application)
            .attachLoadingLiveData(loadingStateLiveData)
            .build()
    }

    /**
     * Api call with EasyApi
     * Expose the LiveData Items query so the UI can observe it.
     */
    fun fetchUsers(loaderInterface: LoaderInterface) {
        usersListApi?.initCall(ApiFactory.instance!!.fetchUsers("1"))!!
            .execute(true) { response, isError: Boolean ->
                  if (!isError)
                       usersLiveData.value = response?.data
            }
    }
}