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Java Source Code
/**
* Copyright (c) 2012 The University of Nottingham
* /*www.java2s.com*/
* This file is part of ubihelper
*
* ubihelper is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ubihelper is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with ubihelper. If not, see <http://www.gnu.org/licenses/>.
*
* @author Chris Greenhalgh (cmg@cs.nott.ac.uk), The University of Nottingham
*/package uk.ac.horizon.ubihelper.service.channel;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import uk.ac.horizon.ubihelper.channel.NamedChannel;
import uk.ac.horizon.ubihelper.service.Service;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;
/**
* @author cmg
*
*/publicclass SensorChannel extends NamedChannel implements SensorEventListener {
privatestaticfinal String TAG = "ubihelper-sensor";
private SensorManager mSensorManager;
private Sensor mSensor;
privatelong lastValueTime;
privatelong minInterval;
public SensorChannel(String name, Service service, Sensor sensor) {
super(name);
mSensorManager = (SensorManager) service.getSystemService(Context.SENSOR_SERVICE);
mSensor = sensor;
}
public SensorChannel(String name, Service service, int sensorType) {
super(name);
mSensorManager = (SensorManager) service.getSystemService(Context.SENSOR_SERVICE);
if (mSensorManager!=null) {
mSensor = mSensorManager.getDefaultSensor(sensorType);
if (mSensor==null)
Log.w(TAG,"No sensor found for "+name+" (type "+sensorType+")");
}
}
@Override
protectedvoid handleStart() {
minInterval = (long)(1000*period);
lastValueTime = 0;
if (mSensor!=null) {
mSensorManager.registerListener(this, mSensor, (int)(1000000*period));
Log.d(TAG,"Start sensor "+name);
}
}
/* (non-Javadoc)
* @see uk.ac.horizon.ubihelper.channel.NamedChannel#handleStop()
*/
@Override
protectedvoid handleStop() {
if (mSensor!=null) {
Log.d(TAG, "Stop sensor "+name);
mSensorManager.unregisterListener(this);
}
}
publicvoid onAccuracyChanged(Sensor sensor, int accuracy) {
// ?
}
publicvoid onSensorChanged(SensorEvent event) {
long now = System.currentTimeMillis();
long elapsed = now-lastValueTime;
if (elapsed<minInterval) {
Log.d(TAG,"Discard sensor value "+name+", elapsed "+elapsed+"/"+minInterval);
return;
}
lastValueTime = now;
JSONObject value = new JSONObject();
try {
// event time is in nanoseconds
value.put("timestamp", event.timestamp/1000000);
JSONArray values = new JSONArray();
for (int i=0; i<event.values.length; i++)
values.put(event.values[i]);
value.put("values", values);
value.put("accuracy", event.accuracy);
Log.d(TAG,"onSensorChanged("+name+"): "+value);
} catch (JSONException e) {
/* ignore */
}
onNewValue(value);
}
}