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    <p>Here is the code you need to use the OnRecordPositionUpdateListener and Notification Period. </p> <p>I noticed that in practice it does not send the notification consistently at the same exact time, I want, but it is close enough.</p> <p>About <code>detectAfterEvery</code>:</p> <p>The size of detectEvery needs to be large enough to hold just the amount of data you want. So for this example, we have a sample rate of 44100 Hz, that means we want 44100 samples per second. By setting the <code>setPositionNotificationPeriod</code> to be 44100, the code tells Android to callback after it has recorded 44100 samples, which is about every 1 second.</p> <p>The complete code is <a href="https://github.com/gast-lib/gast-lib/blob/master/library/src/root/gast/audio/record/AudioClipRecorder.java">here</a>:</p> <pre><code> final int sampleRate = 44100; int bufferSize = AudioRecord.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); //aim for 1 second int detectAfterEvery = (int)((float)sampleRate * 1.0f); if (detectAfterEvery &gt; bufferSize) { Log.w(TAG, "Increasing buffer to hold enough samples " + detectAfterEvery + " was: " + bufferSize); bufferSize = detectAfterEvery; } recorder = new AudioRecord(AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize); recorder.setPositionNotificationPeriod(detectAfterEvery); final short[] audioData = new short[bufferSize]; final int finalBufferSize = bufferSize; OnRecordPositionUpdateListener positionUpdater = new OnRecordPositionUpdateListener() { @Override public void onPeriodicNotification(AudioRecord recorder) { Date d = new Date(); //it should be every 1 second, but it is actually, "about every 1 second" //like 1073, 919, 1001, 1185, 1204 milliseconds of time. Log.d(TAG, "periodic notification " + d.toLocaleString() + " mili " + d.getTime()); recorder.read(audioData, 0, finalBufferSize); //do something amazing with audio data } @Override public void onMarkerReached(AudioRecord recorder) { Log.d(TAG, "marker reached"); } }; recorder.setRecordPositionUpdateListener(positionUpdater); Log.d(TAG, "start recording, bufferSize: " + bufferSize); recorder.startRecording(); //remember to still have a read loop otherwise the listener won't trigger while (continueRecording) { recorder.read(audioData, 0, bufferSize); } </code></pre>
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    1. POAndroid AudioRecord class - process live mic audio quickly, set up callback function
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    1. CO+1 nice answer, suppose I want to write the `audioData` to an AudioTrack object where should I place the call for it.. after the read call inside the listener or after the read call in while loop ?.. plz help!!!
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    2. CO@cant understand they way u handle detectAfterEvery... plz explain...
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    3. COSame question : Can you explain the way you handle detectAfterEvery ?
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      1. USetiennepeiniau
 

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