Android AudioRecord example [closed]

Here I am posting you the some code example which record good quality of sound using AudioRecord API.

Note: If you use in emulator the sound quality will not much good because we are using sample rate 8k which only supports in emulator. In device use sample rate to 44.1k for better quality.

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 writing 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);    }}

For more detail try this AUDIORECORD BLOG.

Happy Coding !!

Here is an end to end solution I implemented for streaming Android microphone audio to a server for playback: Android AudioRecord to Server over UDP Playback Issues