Audio Record

Note: source, outputFormat, Encoder, outputFile

Permission required

<uses-permission android:name="android.permission.RECORD_AUDIO" />

Audio record model

class AudioRecordModel(private val context: Application) : AndroidViewModel(context) {
    private var recoder: MediaRecorder? = null
    var isRecording by mutableStateOf(false)

    fun start() {
        val currentTime = System.currentTimeMillis().let {
            SimpleDateFormat("yyyy-MM-dd_HH:mm:ss", Locale.TAIWAN).format(it)
        }
        val file =
            File(context.getExternalFilesDir(Environment.DIRECTORY_MUSIC), "$currentTime.m4a")
        recoder = MediaRecorder(context).apply {
            setAudioSource(MediaRecorder.AudioSource.MIC)
            setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
            setAudioEncoder(MediaRecorder.AudioEncoder.AAC)
            setOutputFile(file)
            prepare()
            start()
        }
        isRecording = true
    }

    fun stop() {
        recoder?.apply {
            stop()
            release()
        }
        recoder = null
        isRecording = false
    }
}