Gemma 3n Preview

Deepseek r1 thinking gave me this: To add chat history to your Android LLM app, follow these steps: ### 1. **Database Setup** Create a Room database to store chat messages. **ChatMessageEntity.kt** ```kotlin @Entity(tableName = "chat_messages") data class ChatMessageEntity( @PrimaryKey(autoGenerate = true) val id: Long = 0, val modelId: String, // Unique identifier for the model val content: String, @TypeConverters(ChatSideConverter::class) val side: ChatSide, @TypeConverters(ChatMessageTypeConverter::class) val type: ChatMessageType, val timestamp: Long ) ``` **Converters** ```kotlin class ChatSideConverter { @TypeConverter fun toString(side: ChatSide): String = side.name @TypeConverter fun toChatSide(value: String): ChatSide = enumValueOf(value) } class ChatMessageTypeConverter { @TypeConverter fun toString(type: ChatMessageType): String = type.name @TypeConverter fun toChatMessageType(value: String): ChatMessageType = enumValueOf(value) } ``` **ChatMessageDao.kt** ```kotlin @Dao interface ChatMessageDao { @Query("SELECT * FROM chat_messages WHERE modelId = :modelId ORDER BY timestamp ASC") suspend fun getMessagesByModel(modelId: String): List<ChatMessageEntity> @Insert suspend fun insert(message: ChatMessageEntity) @Query("DELETE FROM chat_messages WHERE modelId = :modelId") suspend fun clearMessagesByModel(modelId: String) } ``` ### 2. **Repository Layer** Create a repository to handle database operations. **ChatRepository.kt** ```kotlin class ChatRepository(private val dao: ChatMessageDao) { suspend fun getMessages(modelId: String) = dao.getMessagesByModel(modelId) suspend fun saveMessage(message: ChatMessageEntity) = dao.insert(message) suspend fun clearMessages(modelId: String) = dao.clearMessagesByModel(modelId) } ``` ### 3. **Modify ViewModel** Integrate the repository into `LlmChatViewModel`. **LlmChatViewModel.kt** ```kotlin open class LlmChatViewModel( private val repository: ChatRepository, // Inject via DI curTask: Task = TASK_LLM_CHAT ) : ChatViewModel(task = curTask) { // Load messages when a model is initialized fun loadMessages(model: Model) { viewModelScope.launch(Dispatchers.IO) { val entities = repository.getMessages(model.id) entities.forEach { entity -> val message = when (entity.type) { ChatMessageType.TEXT -> ChatMessageText( content = entity.content, side = entity.side ) // Handle other types if needed else -> null } message?.let { addMessage(model, it) } } } } // Override or modify message handling to include DB operations fun sendUserMessage(model: Model, input: String) { // Add user message addMessage(model, ChatMessageText(input, ChatSide.USER)) // Generate response generateResponse(model, input, onError = { /* Handle error */ }) } // Modified generateResponse to save agent messages override fun generateResponse(...) { // Existing code... resultListener = { partialResult, done -> // When done, save the final message if (done) { val lastMessage = getLastMessage(model) as? ChatMessageText lastMessage?.let { viewModelScope.launch(Dispatchers.IO) { repository.saveMessage( ChatMessageEntity( modelId = model.id, content = it.content, side = it.side, type = it.type, timestamp = System.currentTimeMillis() ) ) } } } } } // Clear both UI and DB messages fun clearChatHistory(model: Model) { clearAllMessages(model) viewModelScope.launch(Dispatchers.IO) { repository.clearMessages(model.id) } } } ``` ### 4. **Dependency Injection** Use Hilt to inject dependencies. **AppModule.kt** ```kotlin @Module @InstallIn(SingletonComponent::class) object AppModule { @Provides fun provideChatDao(@ApplicationContext context: Context): ChatMessageDao { return Room.databaseBuilder( context, AppDatabase::class.java, "chat-db" ).build().chatMessageDao() } @Provides fun provideChatRepository(dao: ChatMessageDao) = ChatRepository(dao) } ``` ### 5. **UI Layer Adjustments** Load messages when the fragment starts and handle user interactions. **ChatFragment.kt** ```kotlin @AndroidEntryPoint class ChatFragment : Fragment() { private val viewModel: LlmChatViewModel by viewModels() override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) val model = // Get selected model viewModel.loadMessages(model) sendButton.setOnClickListener { val input = inputEditText.text.toString() viewModel.sendUserMessage(model, input) } } } ``` ### Key Changes: - **Persist Messages**: Only save `ChatMessageText` with `ChatSide.USER`/`AGENT` to the database. - **Load on Startup**: Load messages when the fragment initializes. - **Clear History**: Ensure both UI and database are cleared when resetting. This approach maintains chat history across app restarts and handles streaming responses by saving only the final message. Adjust based on your app's specific needs (e.g., handling images). I did use 3n to find the right file to give to r1. I gave that to 3n promt code snippet with kotlin selected and it liked it.