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MainActivity.java
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package com.example.rohan.beta_hear;
import android.media.AudioAttributes;
import android.media.AudioFormat;
import android.media.AudioTrack;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.TextView;
import static android.media.AudioFormat.CHANNEL_OUT_MONO;
import static android.media.AudioFormat.ENCODING_PCM_FLOAT;
import static android.media.AudioManager.AUDIO_SESSION_ID_GENERATE;
import static android.media.AudioManager.STREAM_MUSIC;
public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
int trial;
int number_frequencies = 8;
int number_intensities = 15;
Button play;
Button heard_it;
ProgressBar intensity_progressbar;
ProgressBar frequency_progressbar;
SeekBar duration_bar; // for duration
AudioTrack audioTrack;
TextView textView; // to display the intensity level at which the user hears the sound
PlayTask playTask;
private void initViews() {
setContentView(R.layout.activity_main);
play = findViewById(R.id.button_play1);
heard_it = findViewById(R.id.button_hear1);
duration_bar = findViewById(R.id.seekBar);
intensity_progressbar = findViewById(R.id.pb1);
intensity_progressbar.setMax(number_intensities);
frequency_progressbar = findViewById(R.id.pb2);
frequency_progressbar.setMax(number_frequencies);
textView = findViewById(R.id.textView1);
textView.setText("Trial 1");
duration_bar.setMax(200);
duration_bar.setProgress(180);
play.setOnClickListener(this);
play.setText("100 Hz");
heard_it.setOnClickListener(this);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initViews();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_play1:
/*if(playTask.isCancelled())
playTask = new PlayTask();*/
trial=1;
playTask = new PlayTask();
int freq = frequency_progressbar.getProgress();
playTask.execute(freq);
break;
case R.id.button_hear1:
playTask.cancel(true);
break;
}
}
private class PlayTask extends AsyncTask <Integer, Integer, Integer> {
@Override
protected Integer doInBackground(Integer... freq) {
for (int i = 0; i <= intensity_progressbar.getMax(); i++) {
double secs = (duration_bar.getProgress() / 100) + 0.2;
publishProgress(freq[0]);
try {
Thread.sleep((long) (secs * 1000));
} catch (InterruptedException e) {
e.printStackTrace();
}
if (isCancelled())
break;
}
return intensity_progressbar.getProgress(); //for the onCancelled()
}
private int getIntensity(int progress) { // return the intensity level in dB from the progress
int intensity;
switch (progress) {
case 0:
intensity = -105;
break;
case 1:
intensity = -95;
break;
case 2:
intensity = -85;
break;
case 3:
intensity = -80;
break;
case 4:
intensity = -75;
break;
case 5:
intensity = -70;
break;
case 6:
intensity = -65;
break;
case 7:
intensity = -60;
break;
case 8:
intensity = -55;
break;
case 9:
intensity = -50;
break;
case 10:
intensity = -45;
break;
case 11:
intensity = -40;
break;
case 12:
intensity = -35;
break;
case 13:
intensity = -30;
break;
case 14:
intensity = -25;
break;
case 15:
intensity = -20;
break;
default:
intensity = -50;
break;
}
return intensity;
}
private int getFrequency(int progress) {
int frequency;
switch (progress) {
case 0:
frequency = 100;
break;
case 1:
frequency = 200;
break;
case 2:
frequency = 400;
break;
case 3:
frequency = 800;
break;
case 4:
frequency = 1600;
break;
case 5:
frequency = 3200;
break;
case 6:
frequency = 6400;
break;
case 7:
frequency = 12800;
break;
default:
frequency = 3200;
}
return frequency;
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
double duration = duration_bar.getProgress() / 100;
int intensity = getIntensity(intensity_progressbar.getProgress());
int frequency = getFrequency(values[0]);
PlayAudioTrack(frequency, duration, intensity);
intensity_progressbar.incrementProgressBy(1);
}
@Override
protected void onCancelled(Integer result) { // to play when the heard button is clicked
if(trial!=3)
{
intensity_progressbar.setProgress(intensity_progressbar.getProgress()-3);
trial++;
playTask = new PlayTask();
int freq = frequency_progressbar.getProgress();
playTask.execute(freq);
textView.setText("Trial "+trial);
}
else
{
frequency_progressbar.incrementProgressBy(1);
int intensity = getIntensity(result);
textView.setText(String.valueOf(intensity));
textView.append("dB");
intensity_progressbar.setProgress(0);
int frequency = getFrequency(frequency_progressbar.getProgress());
String freq_text = String.valueOf(frequency);
freq_text += " Hz";
play.setText(freq_text);
trial=1;
}
}
}
public void PlayAudioTrack(int frequency, double duration, int intensity) {
int sampleRate = 48000; // Samples per second
double numFrames = sampleRate * duration;
double frameCounter = 0;
double power = Math.pow(10, (intensity / 10));
double amplitude = Math.pow(2 * power, 0.5);
AudioAttributes aud_att = new AudioAttributes.Builder()
.setUsage(AudioAttributes.USAGE_MEDIA)
.setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN)
.setLegacyStreamType(STREAM_MUSIC)
.build();
AudioFormat aud_format = new AudioFormat.Builder()
.setEncoding(ENCODING_PCM_FLOAT)
.setSampleRate(sampleRate)
.build();
int bufsize = android.media.AudioTrack.getMinBufferSize(sampleRate, CHANNEL_OUT_MONO, ENCODING_PCM_FLOAT);
audioTrack = new AudioTrack(aud_att, aud_format, bufsize, AudioTrack.MODE_STREAM, AUDIO_SESSION_ID_GENERATE);
float[] buffer = new float[bufsize];
while (frameCounter < numFrames) {
double remaining = numFrames - frameCounter;
int toWrite = (remaining > bufsize) ? bufsize : (int) remaining;
for (int s = 0; s < toWrite; s++, frameCounter++) {
buffer[s] = (float) (amplitude * Math.sin(2.0 * Math.PI * frequency * frameCounter / sampleRate));
}
audioTrack.write(buffer, 0, bufsize, AudioTrack.WRITE_BLOCKING);
audioTrack.play();
}
audioTrack.stop();
audioTrack.release();
}
}