// MARK: Audio Recording

private fun record() {

    recorder.setAudioSource(MediaRecorder.AudioSource.MIC)
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)
    val path: File = filesDir
    try {
        tempFile = File.createTempFile("audioTemp", ".3gp", path)
    } catch (e: IOException) {
        Log.d("recording error", "recording error:", e)
    } catch (e: FileAlreadyExistsException) {
        Log.d("File already Exist", e.toString())
    }

    recorder.setOutputFile(tempFile?.absolutePath)
    try {
        recorder.prepare()
    } catch (e: IOException) {
        Log.d("recording error", "recording error:", e)
    }
    recorder.start()
}

private fun stopRecord() {
    recorder.stop()
    recorder.release()
    button_play_sample.isEnabled = true
    button_record.isEnabled = true
    player.setOnCompletionListener(this)
    try {
        player.setDataSource(tempFile?.absolutePath)
    } catch (e: IOException) {
        Log.d("stop recording error", "Stop Recording Error:", e)
    }
    try {
        player.prepare()
    } catch (e: IOException) {
        Log.d("recording error", "recording error:", e)
    }
}

private fun play() {
    player.start()
    button_record.isEnabled = false
}

override fun onCompletion(mp: MediaPlayer?) {
    handler = Handler()
    handler?.postDelayed({button_record.isEnabled = true}, 1000)
}