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    <p>in one of my project i had this requirement to continuously record audio from Microphone. i can not share the project but i can share the specific AudioRecorder class.</p> <pre><code>import java.io.File; import java.io.IOException; import java.io.RandomAccessFile; import java.nio.ByteBuffer; import java.nio.ByteOrder; import android.content.Context; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.util.Log; public class AudioRecorder { public enum State {INITIALIZING, READY, RECORDING, ERROR, STOPPED}; private byte[] audioBuffer = null; private int source = MediaRecorder.AudioSource.MIC; private int sampleRate = 0; private int encoder =0; private int nChannels = 0; private int bufferRead = 0; private int bufferSize = 0; private RandomAccessFile tempAudioFile = null; public AudioRecord audioRecorder = null; private State state; private short bSamples = 16; private int framePeriod; // The interval in which the recorded samples are output to the file // Used only in uncompressed mode private static final int TIMER_INTERVAL = 120; volatile Thread t = null; public int TimeStamp =0, count=0, preTimeStamp =0; public AudioRecorder(Context c) { this.sampleRate = 11025; this.encoder = AudioFormat.ENCODING_PCM_16BIT; this.nChannels = AudioFormat.CHANNEL_CONFIGURATION_MONO; this.preTimeStamp = (int) System.currentTimeMillis(); myApp = (MyApp)c.getApplicationContext(); mQueue = myApp.getQueue(); try { /* String fileName = "/sdcard/XYZ/11025.wav"; tempAudioFile = new RandomAccessFile(fileName,"rw"); */ framePeriod = sampleRate * TIMER_INTERVAL / 1000; bufferSize = framePeriod * 2 * bSamples * nChannels / 8; if (bufferSize &lt; AudioRecord.getMinBufferSize(sampleRate, nChannels, encoder)) { bufferSize = AudioRecord.getMinBufferSize(sampleRate, nChannels, encoder); // Set frame period and timer interval accordingly framePeriod = bufferSize / ( 2 * bSamples * nChannels / 8 ); Log.w(AudioRecorder.class.getName(), "Increasing buffer size to " + Integer.toString(bufferSize)); } audioRecorder = new AudioRecord(source,sampleRate,nChannels,encoder,bufferSize); audioBuffer = new byte[2048]; audioRecorder.setRecordPositionUpdateListener(updateListener); audioRecorder.setPositionNotificationPeriod(framePeriod); } catch(Exception ex) { ex.printStackTrace(); } } private AudioRecord.OnRecordPositionUpdateListener updateListener = new AudioRecord.OnRecordPositionUpdateListener() { @Override public void onPeriodicNotification(AudioRecord recorder) { // Log.d(Constant.APP_LOG,"Into Periodic Notification..."); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } */ } @Override public void onMarkerReached(AudioRecord recorder) { // TODO Auto-generated method stub } }; public void start() { if (state == State.INITIALIZING) { audioRecorder.startRecording(); state = State.RECORDING; t = new Thread() { public void run() { //Here You can read your Audio Buffers audioRecorder.read(audioBuffer, 0, 2048); } }; t.setPriority(Thread.MAX_PRIORITY); t.start(); } else { Log.e(AudioRecorder.class.getName(), "start() called on illegal state"); state = State.ERROR; } } public void stop() { if (state == State.RECORDING) { audioRecorder.stop(); Thread t1 = t; t=null; t1.interrupt(); count =0; state = State.STOPPED; } else { Log.e(AudioRecorder.class.getName(), "stop() called on illegal state"); state = State.ERROR; } } public void release() { if (state == State.RECORDING) { stop(); } if (audioRecorder != null) { audioRecorder.release(); } } public void reset() { try { if (state != State.ERROR) { release(); } } catch (Exception e) { Log.e(AudioRecorder.class.getName(), e.getMessage()); state = State.ERROR; } } public State getState() { return state; } } </code></pre> <p>Now, Create Service and just call start() method and manipulate your recorded audio buffer for your purpose.</p> <p>Hope it will Help you.</p>
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    1. POHow to record audio/voice in background continuously in android?
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    1. COHi nishant thanks for the reply Just now i edited my question I want to start the recording when there is voice(speech) input. Do u have any idea about that if yes plz share
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    2. COHi Dipali as per your edited question i have just come across this thread http://stackoverflow.com/questions/9547197/android-sound-verification ... Hope it will help you.
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    3. COHi @NISHANT why you set 't.setPriority(Thread.MAX_PRIORITY);'? and can you explain about mQueue. is it related to project?
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