Simple sensor logging application for Processing Android

gistfile1.txt

import ketai.sensors.*;
import android.content.Context;
import android.hardware.SensorManager;
import android.os.Environment;
import java.io.File;

ArrayList<String> logString;

KetaiSensor sensor;
float[] accelerometer = new float[3];
float[] magneticField = new float[3];
float[] gyro = new float[3];

boolean log;

SensorManager sensorManager;

void setup()
{
  logString = new ArrayList();
  sensorManager = (SensorManager) getApplicationContext().getSystemService(Context.SENSOR_SERVICE);
  
  sensor = new KetaiSensor(this);
  sensor.start();
  
  orientation(LANDSCAPE);
  textSize(36);
}

void draw()
{
  if(log)
  {
    String s = accelerometer[0] + " " + accelerometer[1] + " " + accelerometer[2] + "\n";
    s += magneticField[0] + " " + magneticField[1] + " " + magneticField[2] + "\n";
    s += gyro[0] + " " + gyro[1] + " " + gyro[2] + "\n";
    s += "---------------------";
    logString.add(s);
  }
}

void mousePressed()
{
  
  if(log){
    String[] s = new String[logString.size()];
    int i = 0;
    while ( i < logString.size() ) {
      s[i] = logString.get(i);
      i++;
    }
    
    String SDCARD = Environment.getExternalStorageDirectory().getAbsolutePath();
    println( SDCARD );
    saveStrings(SDCARD + File.separator + "circle_log.txt", s);
    
  }
  
  log = !log;
}

void onAccelerometerEvent(float x, float y, float z, long time, int accuracy)
{
  accelerometer[0] = x;
  accelerometer[1] = y;
  accelerometer[2] = z;
}

void onMagneticFieldEvent(float x, float y, float z, long time, int accuracy)
{
  magneticField[0] = x;
  magneticField[1] = y;
  magneticField[2] = z;
  
}

void onOrientationEvent(float x, float y, float z)
{
  gyro[0] = x;
  gyro[1] = y;
  gyro[2] = z;
  
}