Building Modern Mobile Apps with Flutter & Kotlin.

import 'package:flutter_riverpod/flutter_riverpod.dart';

// Clean State Definition for AI Plant Scanner
@immutable
class PlantScanState {
  final bool isLoading;
  final PlantModel? plant;
  final String? errorMessage;

  const PlantScanState({
    this.isLoading = false,
    this.plant,
    this.errorMessage,
  });
}

class PlantScanNotifier extends StateNotifier<PlantScanState> {
  final IAiVisionRepository _repository;

  PlantScanNotifier(this._repository) : super(const PlantScanState());

  Future<void> scanPlantImage(String imagePath) async {
    state = PlantScanState(isLoading: true);
    final result = await _repository.analyzeLeaf(imagePath);
    result.fold(
      (error) => state = PlantScanState(errorMessage: error.message),
      (plant) => state = PlantScanState(plant: plant),
    );
  }
}

package com.ielts.prepify.ui.listening

import androidx.compose.runtime.*
import androidx.lifecycle.ViewModel

@Composable
fun ListeningAudioPlayer(
    viewModel: ListeningViewModel = hiltViewModel()
) {
    val uiState by viewModel.uiState.collectAsStateWithLifecycle()

    Column(modifier = Modifier.fillMaxWidth().padding(16.dp)) {
        Text(text = uiState.currentTrackTitle, style = MaterialTheme.typography.h6)
        AudioWaveformBar(progress = uiState.progress)
        
        IconButton(onClick = { viewModel.togglePlayPause() }) {
            Icon(
                imageVector = if (uiState.isPlaying) Icons.Filled.Pause else Icons.Filled.PlayArrow,
                contentDescription = "Play Pause Control"
            )
        }
    }
}

// Dart MethodChannel Client setup
class NativeAudioService {
  static const _channel = MethodChannel('com.ashir.dev/native_audio');

  Future<bool> initializeHardwareEngine() async {
    try {
      final bool success = await _channel.invokeMethod('initAudioEngine');
      return success;
    } on PlatformException catch (e) {
      return false;
    }
  }
}