📦 deps(thirdparty): update snapshots

2026-06-10 16:02:03 +00:00
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+# Native Android — Java Reference
+
+## When to Use Java
+
+Java remains fully supported by Android and Google. Use it when:
+- Maintaining or extending an existing Java codebase
+- Team is Java-fluent without Kotlin experience
+- Integrating Java-only SDKs or legacy modules
+- Gradual migration: new Kotlin modules alongside old Java modules
+
+> **Java + Kotlin interop is seamless** — you can have both in the same project. New files can be Kotlin while legacy files stay Java.
+
+---
+
+## Project Structure
+
+```
+app/src/main/java/com/example/app/
+├── MyApp.java                   # Application class
+├── MainActivity.java            # Host activity
+├── ui/
+│   └── home/
+│       ├── HomeActivity.java    # OR Fragment-based
+│       ├── HomeFragment.java
+│       └── HomeAdapter.java
+├── viewmodel/
+│   └── HomeViewModel.java
+├── repository/
+│   └── ItemRepository.java
+├── data/
+│   ├── remote/
+│   │   ├── ApiService.java      # Retrofit interface
+│   │   ├── ApiClient.java       # OkHttp + Retrofit setup
+│   │   └── dto/ItemDto.java
+│   └── local/
+│       ├── AppDatabase.java     # Room database
+│       ├── ItemDao.java
+│       └── entity/ItemEntity.java
+├── model/
+│   └── Item.java                # Domain model
+└── di/                          # Manual DI or Hilt
+```
+
+---
+
+## ViewModel (Java + LiveData)
+
+```java
+public class HomeViewModel extends ViewModel {
+
+    private final MutableLiveData<UiState<List<Item>>> _uiState =
+        new MutableLiveData<>(UiState.loading());
+
+    public LiveData<UiState<List<Item>>> uiState = _uiState;
+
+    private final ItemRepository repository;
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+
+    // Constructor injection (Hilt or manual)
+    public HomeViewModel(ItemRepository repository) {
+        this.repository = repository;
+        loadItems();
+    }
+
+    public void loadItems() {
+        _uiState.setValue(UiState.loading());
+        executor.execute(() -> {
+            try {
+                List<Item> items = repository.getItems();
+                _uiState.postValue(UiState.success(items));
+            } catch (Exception e) {
+                _uiState.postValue(UiState.error(e.getMessage()));
+            }
+        });
+    }
+
+    @Override
+    protected void onCleared() {
+        super.onCleared();
+        executor.shutdown();
+    }
+}
+```
+
+---
+
+## UiState Wrapper
+
+```java
+public class UiState<T> {
+    public enum Status { LOADING, SUCCESS, ERROR }
+
+    public final Status status;
+    public final T data;
+    public final String errorMessage;
+
+    private UiState(Status status, T data, String errorMessage) {
+        this.status = status;
+        this.data = data;
+        this.errorMessage = errorMessage;
+    }
+
+    public static <T> UiState<T> loading() {
+        return new UiState<>(Status.LOADING, null, null);
+    }
+
+    public static <T> UiState<T> success(T data) {
+        return new UiState<>(Status.SUCCESS, data, null);
+    }
+
+    public static <T> UiState<T> error(String message) {
+        return new UiState<>(Status.ERROR, null, message);
+    }
+
+    public boolean isLoading() { return status == Status.LOADING; }
+    public boolean isSuccess() { return status == Status.SUCCESS; }
+    public boolean isError()   { return status == Status.ERROR; }
+}
+```
+
+---
+
+## Fragment Observing ViewModel
+
+```java
+public class HomeFragment extends Fragment {
+
+    private HomeViewModel viewModel;
+    private FragmentHomeBinding binding; // ViewBinding
+
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             ViewGroup container, Bundle savedInstanceState) {
+        binding = FragmentHomeBinding.inflate(inflater, container, false);
+        return binding.getRoot();
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        viewModel = new ViewModelProvider(this,
+            new HomeViewModelFactory(new ItemRepository(requireContext())))
+            .get(HomeViewModel.class);
+
+        viewModel.uiState.observe(getViewLifecycleOwner(), state -> {
+            binding.progressBar.setVisibility(state.isLoading() ? View.VISIBLE : View.GONE);
+            binding.recyclerView.setVisibility(state.isSuccess() ? View.VISIBLE : View.GONE);
+            binding.errorView.setVisibility(state.isError() ? View.VISIBLE : View.GONE);
+
+            if (state.isSuccess()) {
+                adapter.submitList(state.data);
+            }
+            if (state.isError()) {
+                binding.errorText.setText(state.errorMessage);
+            }
+        });
+
+        binding.retryButton.setOnClickListener(v -> viewModel.loadItems());
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null; // CRITICAL — avoid memory leak
+    }
+}
+```
+
+---
+
+## Room Database (Java)
+
+```java
+// Entity
+@Entity(tableName = "items")
+public class ItemEntity {
+    @PrimaryKey
+    @NonNull
+    public String id;
+    public String title;
+    public long updatedAt;
+
+    public ItemEntity(@NonNull String id, String title, long updatedAt) {
+        this.id = id;
+        this.title = title;
+        this.updatedAt = updatedAt;
+    }
+}
+
+// DAO
+@Dao
+public interface ItemDao {
+    @Query("SELECT * FROM items ORDER BY updatedAt DESC")
+    LiveData<List<ItemEntity>> observeAll();
+
+    @Query("SELECT * FROM items ORDER BY updatedAt DESC")
+    List<ItemEntity> getAll(); // blocking — call off main thread
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    void insertAll(List<ItemEntity> items);
+
+    @Query("DELETE FROM items")
+    void deleteAll();
+}
+
+// Database
+@Database(entities = {ItemEntity.class}, version = 1, exportSchema = true)
+public abstract class AppDatabase extends RoomDatabase {
+    private static volatile AppDatabase INSTANCE;
+
+    public abstract ItemDao itemDao();
+
+    public static AppDatabase getInstance(Context context) {
+        if (INSTANCE == null) {
+            synchronized (AppDatabase.class) {
+                if (INSTANCE == null) {
+                    INSTANCE = Room.databaseBuilder(
+                        context.getApplicationContext(),
+                        AppDatabase.class,
+                        "app_database"
+                    ).build();
+                }
+            }
+        }
+        return INSTANCE;
+    }
+}
+```
+
+---
+
+## Retrofit API Client (Java)
+
+```java
+// Interface
+public interface ApiService {
+    @GET("items")
+    Call<List<ItemDto>> getItems();
+
+    @GET("items/{id}")
+    Call<ItemDto> getItemById(@Path("id") String id);
+
+    @POST("items")
+    Call<ItemDto> createItem(@Body ItemDto item);
+}
+
+// Client setup
+public class ApiClient {
+    private static final String BASE_URL = BuildConfig.API_BASE_URL;
+    private static ApiService INSTANCE;
+
+    public static ApiService getInstance() {
+        if (INSTANCE == null) {
+            OkHttpClient client = new OkHttpClient.Builder()
+                .connectTimeout(10, TimeUnit.SECONDS)
+                .readTimeout(10, TimeUnit.SECONDS)
+                .addInterceptor(new AuthInterceptor())
+                .addInterceptor(new HttpLoggingInterceptor()
+                    .setLevel(BuildConfig.DEBUG
+                        ? HttpLoggingInterceptor.Level.BODY
+                        : HttpLoggingInterceptor.Level.NONE))
+                .build();
+
+            Retrofit retrofit = new Retrofit.Builder()
+                .baseUrl(BASE_URL)
+                .client(client)
+                .addConverterFactory(GsonConverterFactory.create())
+                .build();
+
+            INSTANCE = retrofit.create(ApiService.class);
+        }
+        return INSTANCE;
+    }
+}
+
+// Auth interceptor
+public class AuthInterceptor implements Interceptor {
+    @NonNull
+    @Override
+    public Response intercept(@NonNull Chain chain) throws IOException {
+        String token = TokenStorage.getInstance().getToken();
+        Request request = chain.request().newBuilder()
+            .addHeader("Authorization", "Bearer " + token)
+            .build();
+        return chain.proceed(request);
+    }
+}
+```
+
+---
+
+## Repository (Java)
+
+```java
+public class ItemRepository {
+    private final ItemDao itemDao;
+    private final ApiService apiService;
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+
+    public ItemRepository(Context context) {
+        AppDatabase db = AppDatabase.getInstance(context);
+        this.itemDao = db.itemDao();
+        this.apiService = ApiClient.getInstance();
+    }
+
+    // Synchronous fetch for ViewModel executor
+    public List<Item> getItems() throws Exception {
+        Response<List<ItemDto>> response = apiService.getItems().execute();
+        if (response.isSuccessful() && response.body() != null) {
+            return response.body().stream()
+                .map(ItemMapper::toDomain)
+                .collect(Collectors.toList());
+        } else {
+            throw new IOException("HTTP " + response.code());
+        }
+    }
+
+    // Observe cached data (returns LiveData — auto updates UI)
+    public LiveData<List<Item>> observeItems() {
+        return Transformations.map(itemDao.observeAll(), entities ->
+            entities.stream().map(ItemMapper::toDomain).collect(Collectors.toList())
+        );
+    }
+
+    // Refresh from network (call from background thread or executor)
+    public void refreshItems(Callback<Void> callback) {
+        executor.execute(() -> {
+            try {
+                Response<List<ItemDto>> response = apiService.getItems().execute();
+                if (response.isSuccessful() && response.body() != null) {
+                    List<ItemEntity> entities = response.body().stream()
+                        .map(ItemMapper::toEntity)
+                        .collect(Collectors.toList());
+                    itemDao.deleteAll();
+                    itemDao.insertAll(entities);
+                    callback.onSuccess(null);
+                } else {
+                    callback.onError(new IOException("HTTP " + response.code()));
+                }
+            } catch (IOException e) {
+                callback.onError(e);
+            }
+        });
+    }
+
+    public interface Callback<T> {
+        void onSuccess(T result);
+        void onError(Exception e);
+    }
+}
+```
+
+---
+
+## RecyclerView Adapter (Java)
+
+```java
+public class ItemAdapter extends ListAdapter<Item, ItemAdapter.ItemViewHolder> {
+
+    private final OnItemClickListener listener;
+
+    public interface OnItemClickListener {
+        void onItemClick(Item item);
+    }
+
+    public ItemAdapter(OnItemClickListener listener) {
+        super(new DiffUtil.ItemCallback<Item>() {
+            @Override
+            public boolean areItemsTheSame(@NonNull Item a, @NonNull Item b) {
+                return a.getId().equals(b.getId());
+            }
+
+            @Override
+            public boolean areContentsTheSame(@NonNull Item a, @NonNull Item b) {
+                return a.equals(b);
+            }
+        });
+        this.listener = listener;
+    }
+
+    @NonNull
+    @Override
+    public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        ItemRowBinding binding = ItemRowBinding.inflate(
+            LayoutInflater.from(parent.getContext()), parent, false);
+        return new ItemViewHolder(binding);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull ItemViewHolder holder, int position) {
+        holder.bind(getItem(position), listener);
+    }
+
+    static class ItemViewHolder extends RecyclerView.ViewHolder {
+        private final ItemRowBinding binding;
+
+        ItemViewHolder(ItemRowBinding binding) {
+            super(binding.getRoot());
+            this.binding = binding;
+        }
+
+        void bind(Item item, OnItemClickListener listener) {
+            binding.titleText.setText(item.getTitle());
+            binding.getRoot().setOnClickListener(v -> listener.onItemClick(item));
+        }
+    }
+}
+```
+
+---
+
+## XML Layout Best Practices (Java projects)
+
+```xml
+<!-- Use ConstraintLayout — flat hierarchy = better performance -->
+<androidx.constraintlayout.widget.ConstraintLayout
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <!-- Always use ?attr/ tokens from MaterialTheme, never hardcoded colors -->
+    <TextView
+        android:id="@+id/titleText"
+        android:textColor="?attr/colorOnSurface"
+        android:textAppearance="?attr/textAppearanceTitleMedium"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
+```
+
+- Always use **ViewBinding** (not `findViewById`, not DataBinding for simple cases)
+- Enable in `build.gradle.kts`: `viewBinding { enable = true }`
+- Null `binding` in `onDestroyView()` to prevent Fragment memory leaks
+
+---
+
+## Error Handling (Java)
+
+```java
+// Checked exceptions: always handle explicitly
+public Result<List<Item>> getItemsSafe() {
+    try {
+        Response<List<ItemDto>> response = apiService.getItems().execute();
+        if (!response.isSuccessful()) {
+            return Result.failure(new HttpException(response));
+        }
+        List<Item> items = Objects.requireNonNull(response.body())
+            .stream().map(ItemMapper::toDomain).collect(Collectors.toList());
+        return Result.success(items);
+    } catch (IOException e) {
+        return Result.failure(new NetworkException("Network error", e));
+    } catch (NullPointerException e) {
+        return Result.failure(new ParseException("Empty response body", e));
+    }
+}
+
+// Custom exception hierarchy
+public class AppException extends Exception {
+    public AppException(String message) { super(message); }
+    public AppException(String message, Throwable cause) { super(message, cause); }
+}
+public class NetworkException extends AppException { ... }
+public class ParseException extends AppException { ... }
+public class AuthException extends AppException { ... }
+```
+
+---
+
+## Hilt DI (Java)
+
+```java
+// Application
+@HiltAndroidApp
+public class MyApp extends Application {}
+
+// Activity / Fragment — annotate for injection
+@AndroidEntryPoint
+public class HomeFragment extends Fragment {
+    @Inject
+    ItemRepository repository; // injected by Hilt
+}
+
+// ViewModel
+@HiltViewModel
+public class HomeViewModel extends ViewModel {
+    private final ItemRepository repository;
+
+    @Inject
+    public HomeViewModel(ItemRepository repository) {
+        this.repository = repository;
+    }
+}
+
+// Module
+@Module
+@InstallIn(SingletonComponent.class)
+public class DatabaseModule {
+    @Provides
+    @Singleton
+    public AppDatabase provideDatabase(@ApplicationContext Context context) {
+        return AppDatabase.getInstance(context);
+    }
+
+    @Provides
+    public ItemDao provideItemDao(AppDatabase db) {
+        return db.itemDao();
+    }
+}
+```
+
+---
+
+## Unit Testing (Java)
+
+```java
+@ExtendWith(MockitoExtension.class)
+class HomeViewModelTest {
+
+    @Mock
+    ItemRepository mockRepository;
+
+    HomeViewModel viewModel;
+
+    @BeforeEach
+    void setup() {
+        viewModel = new HomeViewModel(mockRepository);
+    }
+
+    @Test
+    void loadItems_success_emitsSuccessState() throws Exception {
+        List<Item> items = Arrays.asList(new Item("1", "Test"));
+        when(mockRepository.getItems()).thenReturn(items);
+
+        viewModel.loadItems();
+
+        // Wait for executor — use CountDownLatch or InstantExecutorRule
+        UiState<List<Item>> state = viewModel.uiState.getValue();
+        assertNotNull(state);
+        assertTrue(state.isSuccess());
+        assertEquals(items, state.data);
+    }
+
+    @Test
+    void loadItems_failure_emitsErrorState() throws Exception {
+        when(mockRepository.getItems()).thenThrow(new IOException("Network error"));
+
+        viewModel.loadItems();
+
+        UiState<List<Item>> state = viewModel.uiState.getValue();
+        assertNotNull(state);
+        assertTrue(state.isError());
+    }
+}
+```
+
+---
+
+## Java → Kotlin Migration Path
+
+When migrating a Java project to Kotlin incrementally:
+
+1. **New files in Kotlin** — Java and Kotlin coexist seamlessly
+2. **Convert utilities first** — `@JvmStatic`, `@JvmField` for interop
+3. **Convert data models** — Java POJOs → Kotlin `data class`
+4. **Convert DAOs and Repositories** — add `suspend` + `Flow`
+5. **Convert ViewModels last** — swap `LiveData` + `MutableLiveData` for `StateFlow`
+6. **Convert Activities/Fragments** — migrate to Compose screen by screen
+7. Annotate Kotlin with `@JvmOverloads`, `@JvmName` where Java callers exist
+
+```kotlin
+// Kotlin data class replacing a Java POJO
+data class Item(
+    val id: String,
+    val title: String,
+    val updatedAt: Long = System.currentTimeMillis()
+)
+
+// Kotlin extension to consume Java LiveData from Kotlin cleanly
+fun <T> LiveData<T>.observeNonNull(owner: LifecycleOwner, observer: (T) -> Unit) {
+    observe(owner) { it?.let(observer) }
+}
+```