问Android:录制和收听音频

EN

public class record {
    private AudioRecord recorder = null;
    private boolean isRecording = false;
    private int SAMPLERATE = 8000;
    private int CHANNELS = AudioFormat.CHANNEL_CONFIGURATION_MONO;
    private int AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;
    private int bufferSize = AudioRecord.getMinBufferSize(SAMPLERATE, CHANNELS,
                    AUDIO_FORMAT);
    private Thread recordingThread = null;

    public void startRecording() {
            recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLERATE,
                            CHANNELS, AUDIO_FORMAT, bufferSize);

            recorder.startRecording();
            isRecording = true;

            recordingThread = new Thread(new Runnable()

            {
                    public void run() {
                            writeAudioData();
                    }

            });
            recordingThread.start();

    }

    public void stopRecording() {
            isRecording = false;
            recorder.stop();
            recorder.release();
            recorder = null;
            recordingThread = null;
    }

    private void writeAudioData() {

            byte data[] = new byte[bufferSize];

            int buff = 8000;
            int minBufferSize = AudioTrack.getMinBufferSize(buff,
                            AudioFormat.CHANNEL_CONFIGURATION_MONO,
                            AudioFormat.ENCODING_PCM_16BIT);

            Log.i("AUDIO", "BufferSize:" + minBufferSize);

            AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, buff,
                            AudioFormat.CHANNEL_CONFIGURATION_MONO,
                            AudioFormat.ENCODING_PCM_16BIT, minBufferSize,
                            AudioTrack.MODE_STREAM);

            at.play();

            while (isRecording) {
                    recorder.read(data, 0, bufferSize);
                    at.write(data, 0, bufferSize);
            }
            at.stop();
            at.release();
    }