Android Open Source - SensorRecorder Main Service

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From Project

Back to project page SensorRecorder.

License

The source code is released under:

/* * Copyright ? 2012 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted pro...

Java Source Code

package edu.ucla.ee.nesl.ipshield.sensorrecorder;
//from  w  w  w  .ja v a  2s  .  co m
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;

import android.app.Service;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Binder;
import android.os.Environment;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MainService extends Service implements SensorEventListener {
  public static final String TAG = "MainService";
  private final IBinder mBinder = new LocalBinder();
  private SensorManager mSensorManager;
  private Sensor mAcc;
  private ArrayList<SensorVector> sensorBuffer;
  
  public class LocalBinder extends Binder {
    MainService getService() {
            // Return this instance of LocalService so clients can call public methods
            return MainService.this;
        }
    }
  
  class SensorVector {
    private float x, y, z;

    public float getX() {
      return x;
    }

    public void setX(float x) {
      this.x = x;
    }

    public float getY() {
      return y;
    }

    public void setY(float y) {
      this.y = y;
    }

    public float getZ() {
      return z;
    }

    public void setZ(float z) {
      this.z = z;
    }
  }
  
  public void init() {
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    mAcc = (Sensor) mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    sensorBuffer = new ArrayList<SensorVector>();
  }

  public void startRecording() {
    sensorBuffer.clear();
    mSensorManager.registerListener(this, mAcc, SensorManager.SENSOR_DELAY_NORMAL);
  }
  
  public void stopRecording() {
    mSensorManager.unregisterListener(this);
    File file = null;
    File dir = new File (Environment.getExternalStorageDirectory().getAbsolutePath() + "/sensor_recording");
    dir.mkdirs();
    file = new File(dir, "SensorRecording_" + new Date().toString() + ".txt");
    try {
      BufferedWriter bw = new BufferedWriter(new FileWriter(file));
      for (SensorVector event:sensorBuffer) {
        bw.write(event.getX() + ","+ event.getY() + "," + event.getZ() + "\n");
        Log.i(TAG, event.getX() + ","+ event.getY() + "," + event.getZ() + "\n");
      }
      bw.flush();
      bw.close();
    } catch (IOException e) {
      e.printStackTrace();
    }

    Log.i(TAG, "data size = " + sensorBuffer.size());
    sensorBuffer.clear();
    
    Toast.makeText(this, "data saved in /sdcard/sensor_recording/" + file.getName(), Toast.LENGTH_LONG).show();
  }

  @Override
  public IBinder onBind(Intent arg0) {
    return mBinder;
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
    SensorVector sv = new SensorVector();
    sv.setX(event.values[0]);
    sv.setY(event.values[1]);
    sv.setZ(event.values[2]);
    sensorBuffer.add(sv);
    Log.i(TAG, "x=" + event.values[0]);
  }
  

}

Java Source Code List

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