Jetpack Compose Glimmer 中的语音输入指示器

// Example state variable to hold the normalized level (0.0 to 1.0)
// that the VoiceInputIndicator component expects.
val audioLevel = MutableStateFlow(0f)

// Initialize the Android SpeechRecognizer
val speechRecognizer = SpeechRecognizer.createSpeechRecognizer(context)

// Listener to capture speech events and audio level changes
val listener = object : RecognitionListener {
    override fun onRmsChanged(rmsdB: Float) {
        // Normalize raw dB level to a 0.0-1.0 range.
        // Android SpeechRecognizer's rmsdB typically ranges from 0 to ~10.
        audioLevel.value = ((rmsdB - 1f) / 9f).coerceIn(0f, 1f)
    }

    // ... Implement other required RecognitionListener methods ...
    override fun onReadyForSpeech(params: Bundle?) {}
    override fun onBeginningOfSpeech() {}
    override fun onEndOfSpeech() {}
    override fun onError(error: Int) {}
    override fun onResults(results: Bundle?) {}
    override fun onPartialResults(partialResults: Bundle?) {}
    override fun onEvent(eventType: Int, params: Bundle?) {}
    override fun onBufferReceived(buffer: ByteArray?) {}
}

// Attach the listener to the recognizer
speechRecognizer.setRecognitionListener(listener)

// Create an intent to specify the recognition model and behavior
val intent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH).apply {
    putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
}
// Begin listening for audio input
speechRecognizer.startListening(intent)
VoiceInputIndicatorSample.kt

@Composable
fun VoiceInputExample(modifier: Modifier) {
    // Collect the flow as Compose State so the UI reacts to changes in real-time.
    val currentLevel by audioLevel.collectAsState()

    VoiceInputIndicator(
        // The VoiceInputIndicator component provides a visual "pulse" or indicator
        // that changes based on the 'level' lambda, which returns a Float between 0.0 and 1.0.
        level = { currentLevel },
        modifier = modifier
    )
}
VoiceInputIndicatorSample.kt