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    <p>I originally found <a href="http://marblemice.blogspot.com/2010/04/generate-and-play-tone-in-android.html" rel="noreferrer">this example code</a> on a blog, but it had some bugs in it that generated some horrendous sounds. I've fixed the bugs and posted the resulting code here. Seems to work well for me!</p> <pre><code>public class PlaySound extends Activity { // originally from http://marblemice.blogspot.com/2010/04/generate-and-play-tone-in-android.html // and modified by Steve Pomeroy &lt;steve@staticfree.info&gt; private final int duration = 3; // seconds private final int sampleRate = 8000; private final int numSamples = duration * sampleRate; private final double sample[] = new double[numSamples]; private final double freqOfTone = 440; // hz private final byte generatedSnd[] = new byte[2 * numSamples]; Handler handler = new Handler(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } @Override protected void onResume() { super.onResume(); // Use a new tread as this can take a while final Thread thread = new Thread(new Runnable() { public void run() { genTone(); handler.post(new Runnable() { public void run() { playSound(); } }); } }); thread.start(); } void genTone(){ // fill out the array for (int i = 0; i &lt; numSamples; ++i) { sample[i] = Math.sin(2 * Math.PI * i / (sampleRate/freqOfTone)); } // convert to 16 bit pcm sound array // assumes the sample buffer is normalised. int idx = 0; for (final double dVal : sample) { // scale to maximum amplitude final short val = (short) ((dVal * 32767)); // in 16 bit wav PCM, first byte is the low order byte generatedSnd[idx++] = (byte) (val &amp; 0x00ff); generatedSnd[idx++] = (byte) ((val &amp; 0xff00) &gt;&gt;&gt; 8); } } void playSound(){ final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, generatedSnd.length, AudioTrack.MODE_STATIC); audioTrack.write(generatedSnd, 0, generatedSnd.length); audioTrack.play(); } } </code></pre>
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    1. POPlaying an arbitrary tone with Android
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    1. USAkshay Mukadam
    1. USSteve Pomeroy
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      1. VTUpMod
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    1. COthat's great, thanks! I'm trying to make the best out of it...
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    2. COIs this line correct? audioTrack.write(generatedSnd, 0, numSamples); or should it be numSamples * 2 because there are 2 bytes per sample. Also the write method also takes an array of shorts so what is the advantage of creating an intermediary array of bytes?
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      1. USDamian Kennedy
    3. COThis is indeed a great example, thanks a lot. However I found another nasty bug (if you extend the code), which is: audioTrack.write(generatedSnd, 0, numSamples) should be audioTrack.write(generatedSnd, 0, 2*numSamples) or better audioTrack.write(generatedSnd, 0, generatedSnd.length);
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      1. USAudioDroid
 

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