hongbeomi

dependencies {
  testImplementation "junit:junit:$junitVersion"
  testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:$coroutinesVersion"
}

hongbeomi

class MyActivity: AppCompatActivity() {
  
  private val viewModel: MyViewModel by viewModels()
  
  override fun onCreate(savedInstanceBundle: Bundle?) {
    /*..*/
    lifecycleScope.launch {
      repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiState.collect { state ->
          if (state.isAddedSuccessful == true) {

hongbeomi

data class MyUiState(
  val info: MyInfoModel,
  val isLoading: Boolean = false,
  val isAddedSuccessful: Boolean? = null
)

class MyViewModel(...): ViewModel() {
 
  private val _uiState = MutableStateFlow<MyUiState>(...)
  val uiState: StateFlow<MyUiState> get() = _uiState.asStateFlow()

hongbeomi

class MyActivity: AppCompatActivity() {
 
  private val viewModel: MyViewModel by viewModels()
  
  override fun onCreate(savedInstanceState: Bundle?) {
    /*..*/
    lifecycleScope.launch {
      repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.navigateToAddedScreen.collect { isSuccessful ->
          val intent = Intent(this, AddedActivity::class.java)

hongbeomi

class MyViewModel(...): ViewModel() {
 
  private val _uiState: MutableStateFlow<MyUiState> = /*..*/
  val uiState: StateFlow<MyUiState> get() = _uiState
  
  // 이렇게 사용하지 마세요
  private val _navigateToAddedScreen: Channel<Boolean> = Channel<Boolean>()
  val navigateToAddedScreen: Flow<Boolean> = _navigateToAddedScreen.receiveAsFlow()
  
  private var makeAddJob: Job? = null

hongbeomi

class MyActivity: AppCompatActivity() {
  
  private lateinit var binding: ActivityMyBinding
  private val viewModel: MyViewModel by viewModels()
  
  override fun onCreate(savedInstanceState: Bundle?) {
    /*...*/
    binding.refreshButton.setOnClickListener {
      viewModel.refresh()
    }

hongbeomi

class MyActivity: AppCompatActivity() {
  
  private lateinit var binding: ActivityMyBinding
  
  override fun onCreate(savedInstanceState: Bundle?) {
    /*...*/
    
    with(binding) {
      expandButton.setOnClickListener {
        expandedView.visibility = View.VISIBLE

hongbeomi

ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
	if (viewType == HeaderViewHolder.TYPE) {
		return new HeaderViewHolder(parent);
	}
	return new MyViewHolder(parent);
}

hongbeomi

ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
	if (viewType == HeaderViewHolder.TYPE) {
		if (mHeaderViewHolder == null) {
			mHeaderViewHolder = new HeaderViewHolder(parent);
		}
		return mHeaderViewHolder;
	}
	return new MyViewHolder(parent);
}

hongbeomi

public void onBindViewHolder(MyViewHolder holder, int position, List payloads) {
	if (payloads.isEmpty()) {
		// 전체 리-바인드
		onBindViewHolder(holder, position);
	} else if (payloads.contains(LIKE_UPDATE)) {
		// 부분적인 리-바인드
		Item item = mItems.get(position);
		holder.likeButton.setEnabled(!item.isLiked());	
	}
}