Android Open Source - Glassemin Glassemin

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License

The source code is released under:

CarrotCorp Open Source License 1.0.1 You may: - Modify the code - Use the code privately - Use the code non-commercially - Share the code non-commercially Under the following conditions: - Credit t...

Java Source Code

// See README and LICENSE files for more information.
//from   w  w w .j ava 2s .co m
package com.carrotcorp.glass.glassemin;

import com.carrotcorp.glass.glassemin.R;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;

public class Glassemin extends Activity implements SensorEventListener {
  SensorManager sensorManager;
  Thread thread;
  AudioTrack audioTrack;
  boolean isRunning = true;
  float lightValue = 0;
  WakeLock wl;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // Create the view:
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_glassemin);
    
    // Prevent the screen from going to sleep:
    PowerManager pm = (PowerManager)this.getSystemService(Context.POWER_SERVICE);
    wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "com.carrotcorp.glass.glassemin");
    wl.acquire();
    
    // Create and start audio:
    createAudio();
    
    // Register the light sensor listener:
    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT), SensorManager.SENSOR_DELAY_FASTEST);
  }
  
  private void createAudio() {
    // Start a new Thread to create audio:
    thread = new Thread() {
      public void run() {
        int sr = 44100;
        int buffsize = AudioTrack.getMinBufferSize(sr, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);
        audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sr, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, buffsize, AudioTrack.MODE_STREAM);
        
        short samples[] = new short[buffsize];
        int amp = 10000;
        double twopi = 8.*Math.atan(1.);
        double ph = 0.0;
        
        audioTrack.play();
        
        while (isRunning) {
          double fr = 200 + 5*lightValue;
          
          for (int i=0; i < buffsize; i++) {
            samples[i] = (short) (amp*Math.sin(ph));
            ph += twopi*fr/sr;
          }
          audioTrack.write(samples, 0, buffsize);
        }
      }
    };
    thread.start();
  }
  
  public void onPause() {
    super.onPause();
    
    // If the app is exited or interrupted:
    if (sensorManager != null) {
      sensorManager.unregisterListener(this);
    }
    
    // Stop the wake lock, only if it has already been acquired:
    if (wl != null) {
      if (wl.isHeld()) {
        wl.release();
      }
    }
    
    // Stop the AudioTrack:
    isRunning = false;
    
    audioTrack.stop();
    audioTrack.release();
    
    thread.interrupt();
    thread = null;
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
    // Get the distance value and log it:
    float distance = event.values[0];
    Log.i("glassemin", "distance=="+distance);
    
    // Round distance to nearest 100 for the lightValue:
    lightValue = distance - (distance % 10);
  }
  
  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // unused
  }

}

Java Source Code List

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