daeun1012

const val MIN_PASSWORD_LENGTH = 8 // 최소 비밀번호 길이
const val TAG = "LoginViewModel"

class LoginViewModel(lifecycleOwner: LifecycleOwner, private val loginActions: LoginActions) : ViewModel(), LifecycleObserver, LoginFragment.LoginFragmentActions {

    val loginData = MutableLiveData<LoginViewData>() // view data 

    private val fbAuthListener: FirebaseAuth.AuthStateListener //로그인 상태 리스너
    private val fbAuth = FirebaseAuth.getInstance() // firebase auth 객체

daeun1012

private ProductAdapter mProductAdapter;

    private ListFragmentBinding mBinding;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        // 바인딩 생성
        mBinding = DataBindingUtil.inflate(inflater, R.layout.list_fragment, container, false);

daeun1012

private void subscribeUi(ProductListViewModel viewModel) {
        // Update the list when the data changes
        viewModel.getProducts().observe(this, new Observer<List<ProductEntity>>() {
            @Override
            public void onChanged(@Nullable List<ProductEntity> myProducts) {
                if (myProducts != null) {
                    mBinding.setIsLoading(false);
                    mProductAdapter.setProductList(myProducts);
                } else {
                    mBinding.setIsLoading(true);

daeun1012

<!-- 레이아웃 태그 선언 -->
<layout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto">

    <data>
        <variable
            name="isLoading"
            type="boolean" />
    </data>

daeun1012

class MyLocationListener implements LifecycleObserver {
      private boolean enabled = false;
      public MyLocationListener(Context context, Lifecycle lifecycle, Callback callback) {
         ...
      }

      @OnLifecycleEvent(Lifecycle.Event.ON_START) // lifecycle event : onStart()
      void start() {
          if (enabled) {
             // connect

daeun1012

class MyLocationListener {
      public MyLocationListener(Context context, Callback callback) {
          // ...
      }

      void start() {
          // connect to system location service
      }

      void stop() {

daeun1012

 public class LiveDataTimerViewModel extends ViewModel {

    private static final int ONE_SECOND = 1000; //1초 스케줄링 (카운팅)

    private MutableLiveData<Long> mElapsedTime = new MutableLiveData<>(); // LiveData

    private long mInitialTime;

    public LiveDataTimerViewModel() {
        mInitialTime = SystemClock.elapsedRealtime();