Android Open Source - sensors2mqtt My Async Task

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License

The source code is released under:

Eclipse Public License - v 1.0 THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES RECI...

Java Source Code

/*******************************************************************************
 * Copyright (c) 2013 Markus Alexander Kuppe and others. All rights reserved. 
 * This program and the accompanying materials are made available under the terms 
 * of the Eclipse Public License v1.0 which accompanies this distribution, and is
 * available at http://www.eclipse.org/legal/epl-v10.html
 */*www .  java 2  s  .c o  m*/
 * Contributors:
 *   Markus Alexander Kuppe - initial API and implementation
 ******************************************************************************/
package org.kuppe.sensors2mqtt;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttPersistenceException;

import android.os.AsyncTask;

public class MyAsyncTask extends AsyncTask<List<Float>, Void, Void> {

  private static final int QoS0 = 0; // fire and forget (lowest QoS is good enough here)

  private final MqttClient client;
  private final String topic;
  private final Comparator<Float> comparator;

  public MyAsyncTask(MqttClient client, String topic) {
    this.client = client;
    this.topic = topic;
    this.comparator = new Comparator<Float>() {
      @Override
      public int compare(Float lhs, Float rhs) {
        return lhs.compareTo(rhs);
      }
    };
  }

  @Override
  protected Void doInBackground(List<Float>... params) {
    final List<Float> list = params[0];

    // Sort sensor readings
    Collections.sort(list, comparator);
    
    // Get median
    final Float[] floats = list.toArray(new Float[list.size()]);
    float f = floats[floats.length / 2];
    
    // Send (as string for easier readability on the consumer end)
    try {
      client.publish(topic, Float.toString(f)
          .getBytes(), QoS0, false);
    } catch (MqttPersistenceException e) {
      e.printStackTrace();
    } catch (MqttException e) {
      e.printStackTrace();
    }
    return null;
  }
}

Java Source Code List

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