AudioRecord 를 이용한 녹음하는 소스

소스파일 첨부: 

ExAudioRecording.zip

public class Audio_Record extends Activity {

private static final int RECORDER_SAMPLERATE = 8000;

private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;

private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

private AudioRecord recorder = null;

private Thread recordingThread = null;

private boolean isRecording = false;

@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    setButtonHandlers();

    enableButtons(false);

    int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,

            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING); 

}

private void setButtonHandlers() {

    ((Button) findViewById(R.id.btnStart)).setOnClickListener(btnClick);

    ((Button) findViewById(R.id.btnStop)).setOnClickListener(btnClick);

}

private void enableButton(int id, boolean isEnable) {

    ((Button) findViewById(id)).setEnabled(isEnable);

}

private void enableButtons(boolean isRecording) {

    enableButton(R.id.btnStart, !isRecording);

    enableButton(R.id.btnStop, isRecording);

}

int BufferElements2Rec = 1024; // want to play 2048 (2K) since 2 bytes we use only 1024

int BytesPerElement = 2; // 2 bytes in 16bit format

private void startRecording() {

    recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,

            RECORDER_SAMPLERATE, RECORDER_CHANNELS,

            RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);

    recorder.startRecording();

    isRecording = true;

    recordingThread = new Thread(new Runnable() {

        public void run() {

            writeAudioDataToFile();

        }

    }, "AudioRecorder Thread");

    recordingThread.start();

}

    //convert short to byte

private byte[] short2byte(short[] sData) {

    int shortArrsize = sData.length;

    byte[] bytes = new byte[shortArrsize * 2];

    for (int i = 0; i < shortArrsize; i++) {

        bytes[i * 2] = (byte) (sData[i] & 0x00FF);

        bytes[(i * 2) + 1] = (byte) (sData[i] >> 8);

        sData[i] = 0;

    }

    return bytes;

}

private void writeAudioDataToFile() {

    // Write the output audio in byte

    String filePath = "/sdcard/voice8K16bitmono.pcm";

    short sData[] = new short[BufferElements2Rec];

    FileOutputStream os = null;

    try {

        os = new FileOutputStream(filePath);

    } catch (FileNotFoundException e) {

        e.printStackTrace();

    }

    while (isRecording) {

        // gets the voice output from microphone to byte format

        recorder.read(sData, 0, BufferElements2Rec);

        System.out.println("Short wirting to file" + sData.toString());

        try {

            // // writes the data to file from buffer

            // // stores the voice buffer

            byte bData[] = short2byte(sData);

            os.write(bData, 0, BufferElements2Rec * BytesPerElement);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    try {

        os.close();

    } catch (IOException e) {

        e.printStackTrace();

    }

}

private void stopRecording() {

    // stops the recording activity

    if (null != recorder) {

        isRecording = false;

        recorder.stop();

        recorder.release();

        recorder = null;

        recordingThread = null;

    }

}

private View.OnClickListener btnClick = new View.OnClickListener() {

    public void onClick(View v) {

        switch (v.getId()) {

        case R.id.btnStart: {

            enableButtons(true);

            startRecording();

            break;

        }

        case R.id.btnStop: {

            enableButtons(false);

            stopRecording();

            break;

        }

        }

    }

};

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

    if (keyCode == KeyEvent.KEYCODE_BACK) {

        finish();

    }

    return super.onKeyDown(keyCode, event);

}

}