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class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        WindowCompat.setDecorFitsSystemWindows(window, false)
        super.onCreate(savedInstanceState)
        setContent {
            ColorPickerTheme {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {

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public final class SavedStateHandle {
  final Map<String, Object> mRegular;
  ...
  private final SavedStateProvider mSavedStateProvider = new SavedStateProvider() {
    @NonNull
    public Bundle saveState() {
      Set<String> keySet = mRegular.keySet();
      ArrayList keys = new ArrayList(keySet.size());
      ArrayList value = new ArrayList(keys.size());
      ...

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public final class SavedStateHandle {
  static SavedStateHandle createHandle(@Nullable Bundle restoredState,
    @Nullable Bundle defaultState) {
    ...
    Map<String, Object> state = new HashMap<>();
    if (defaultState != null) {
      for (String key : defaultState.keySet()) {
        state.put(key, defaultState.get(key));
      }
    }

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@NonNull
@Override
public <T extends ViewModel> T create(@NonNull String key, @NonNull Class<T> modelClass) {
  boolean isAndroidViewModel = AndroidViewModel.class.isAssignableFrom(modelClass);
  ...
  Constructor<T> constructor;
  constructor = ... // Define ViewModel Constructor
  // Case 1, SavedStateHandleが不要の場合
  if (constructor == null) {
    return mFactory.create(modelClass);

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@MainThread
inline fun <reified VM : ViewModel> ComponentActivity.viewModels(
  noinline factoryProducer: (() -> Factory)? = null
): Lazy<VM> {
  val factoryPromise = factoryProducer ?: {
    defaultViewModelProviderFactory
  }
  return ViewModelLazy(VM::class, { viewModelStore }, factoryPromise)
}

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@NonNull
@Override
public ViewModelProvider.Factory getDefaultViewModelProviderFactory() {
   ...
   mDefaultFactory = new SavedStateViewModelFactory(
      requireActivity().getApplication(),
      this,
      getArguments()); // ◀ Fragmentに渡されたArgumentを代入
   }
   return mDefaultFactory;

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@NonNull
@Override
public ViewModelProvider.Factory getDefaultViewModelProviderFactory() {
   ...
   mDefaultFactory = new SavedStateViewModelFactory(
      getApplication(),
      this,
      getIntent() != null ? getIntent().getExtras() : null); // ◀ Activityに渡されたArgumentを代入
   ...
   return mDefaultFactory;

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public class ViewModelProvider {
  ...
  private final Factory mFactory;
  private final ViewModelStore mViewModelStore;
  // ① Use ViewModelStoreOwner
  public ViewModelProvider(@NonNull ViewModelStoreOwner owner) {  
    this(owner.getViewModelStore(), owner instanceof HasDefaultViewModelProviderFactory
        ? ((HasDefaultViewModelProviderFactory) owner).getDefaultViewModelProviderFactory()
        : NewInstanceFactory.getInstance());
  }

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RxJava 3장 ~ 연산자와 변환

핵심 연산자: 매핑과 필터링

map

Operator Wiki : Link

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/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software