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POAsynctask and Handler Thread at the same time?
 

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  1. POAsynctask and Handler Thread at the same time?
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    <p>I am using FFT to analyze audio coming into the mic in real time and this only seems to work when using asyntask. I also need to run another thread in the background. Both items only need to run for 3 seconds. </p> <p>If I try to do both, the ANR times out. Is there a way to get these to work together? </p> <p>I do not need FFT to be in asynctask since I am only writing to files not the display. However, when I pull FFT out of asynctask I get errors on my toTransform array.</p> <p>Any help is appreciated.</p> <pre><code>public class SoundRecord extends Activity implements OnClickListener { boolean started = false; int sampleRate = 8000; // 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 numSamples = duration * sampleRate; private final double sample[] = new double[numSamples]; private final double freqOfTone = 1500; // hz private final byte generatedSnd[] = new byte[2 * numSamples]; Handler handler = new Handler(); Timer timer = new Timer(); public int channelConfiguration = AudioFormat.CHANNEL_IN_MONO; public int audioEncoding = AudioFormat.ENCODING_PCM_16BIT; //FFT private RealDoubleFFT transformer; int blockSize = 256; Button startStopButton; int frequency = 8000; double freq; String freqValue; int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding); AudioRecord audioRecord = new AudioRecord( MediaRecorder.AudioSource.MIC, frequency, channelConfiguration, audioEncoding, bufferSize); GetFrequency recordTask; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_SoundRecord); Button button = (Button) findViewById(R.id.start); button.setOnClickListener(this); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.SoundRecord, menu); return true; } @Override public void onClick(View v) { if (started) { started = false; recordTask.cancel(true); } else { final Thread soundout = new Thread(new Runnable() { public void run() { genTone(); handler.post(new Runnable() { public void run() { playSound(); } }); } }); soundout.start(); //Analyze frequency recordTask = new GetFrequency(); try { recordTask.get(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ExecutionException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 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, numSamples, AudioTrack.MODE_STATIC); audioTrack.write(generatedSnd, 0, generatedSnd.length); audioTrack.play(); } private class GetFrequency extends AsyncTask&lt;Void, double[], Void&gt; { @Override protected Void doInBackground(Void... params) { try { short[] buffer = new short[blockSize]; double[] toTransform = new double[blockSize]; audioRecord.startRecording(); while (started) { int bufferReadResult = audioRecord.read(buffer, 0, blockSize); for (int i = 0; i &lt; blockSize &amp;&amp; i &lt; bufferReadResult; i++) { toTransform[i] = (double) buffer[i] / 32768.0; // signed // 16 // bit } transformer.ft(toTransform); publishProgress(toTransform); timer.schedule(new TimerTask() { public void run() { handler.post(new Runnable() { public void run() { audioRecord.stop(); } }); } }, 3000); //Stop after 3 seconds } } catch (Throwable t) { Log.e("AudioRecord", "Recording Failed"); } return null; } protected void onProgressUpdate(double[]... toTransform) { File freqFile = new File("/mnt/sdcard/Test APKs/frequency.file"); File magFile = new File("/mnt/sdcard/Test APKs/magnitude.file"); int blockSize = 256; double[] audioDataDoubles = new double[(blockSize*2)]; String mydate = java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime()); if (!freqFile.exists()) { try { freqFile.createNewFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (!magFile.exists()) { try { magFile.createNewFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } for ( int x = 0; x &lt; toTransform[0].length; x++) { audioDataDoubles[2*x] = toTransform[0][x]; audioDataDoubles[(2*x)+1] = 0.0; } double[] re = new double[blockSize]; double[] im = new double[blockSize]; double[] magnitude = new double[blockSize]; // Calculate the Real and imaginary and Magnitude. for(int i = 0; i &lt; blockSize; i++){ // real is stored in first part of array re[i] = audioDataDoubles[i*2]; // imaginary is stored in the sequential part im[i] = audioDataDoubles[(2*i)+1]; // magnitude is calculated by the square root of (imaginary^2 + real^2) magnitude[i] = Math.sqrt((re[i] * re[i]) + (im[i]*im[i])); } double peak = -1.0; // Get the largest magnitude peak for(int i = 0; i &lt; blockSize; i++){ if(peak &lt; magnitude[i]) peak = magnitude[i]; String magValue = String.valueOf(peak); try { BufferedWriter buf = new BufferedWriter(new FileWriter(magFile, true)); buf.append(mydate + " - " + magValue); buf.newLine(); buf.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // calculated the frequency freq = (frequency * peak)/blockSize; freqValue = String.valueOf(freq); //Toast.makeText(Main.this, freqValue, Toast.LENGTH_SHORT).show(); try { BufferedWriter buf = new BufferedWriter(new FileWriter(freqFile, true)); buf.append(mydate + " - " + freqValue); buf.newLine(); buf.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre> <p>}</p>
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    1. COYou're doing too much work in `onProgressUpdate`
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    2. CO>I do not need FFT to be in asynctask since I am only writing to files not the display `AsyncTask` is one of several ways to offload tasks from UI thread. writing to file might be lenghty too.
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    3. COLooks like that you try to wite in file when previous write action was not ended. I recommend you separate your logic into `one file = one thread`. Also i recommend organize this action into `Queue` or `ExecutorService`
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