Android Open Source - AndroidLibraryProject Light Data Listener

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The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (c) 2013 by CDAC Chennai /*  w w  w . j a  v a2 s.  c om*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *  
 * @File         LightDataListener
 * @Created:     20.11.2013
 * @author:      Prasenjit
 * Last Changed: 22.08.2014 by Prasenjit
 */
package com.contextawareframework.backgroundservices;


import com.contextawareframework.globalvariable.CAFConfig;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;
import android.widget.Toast;

/**
 * Description : To register light sensor. To make it as service, mention the
 *          package name inside service tag of your Android manifest file
 * */
public class LightDataListener  extends CAFService{

  /* Android SensorManager object to work with sensors.*/
  private SensorManager mSensorManager;

  /* Local variable to select the type of sensor.*/
  private Sensor mLight;

  /* Local variable to store the context of the calling activity.*/
  private final Context mContext;

  /* Local variable to store the SensorEventListener from the calling / implementing Activity. */
  private SensorEventListener listener;

  /* Tag for debugging the class */
  private static final String TAG = "LightDataListener";

  /* To enable / disable Log messages. */
  private static boolean enableDebugging = CAFConfig.isEnableDebugging();

  /* Class instance variable */
  private static LightDataListener lightDataListenerInstance;

  /**
   * Method to enable debugging
   * @param boolean
   */
  public void setEnableDebugging(boolean value)
  {
    enableDebugging = value;
  }

  /**
   * Method to get the present value of enableDebugging
   * @return boolean
   */
  public boolean getEnableDebugging()
  {
    return enableDebugging;
  }

  /**
   * Description : Private constructor. Singleton Pattern to create the class object
   * @param context Calling Activity context
   */
  private LightDataListener(Context context)
  {
    mContext = context;
  }

  /**
   * Description : Method to create an instance of AccelerometerDataListener Class.
   * @param context Calling Activity context
   * @return AccelerometerDataListener Class instance
   */
  public static synchronized LightDataListener getInstance(Context context)
  {
    if (lightDataListenerInstance == null)
      lightDataListenerInstance = new LightDataListener(context);

    return lightDataListenerInstance;
  }

  /**
   * Method to enable Light Sensor in Android
   * */
  public void enableLightSensor(SensorEventListener listenerFromActivity, int sampleRate)
  {

    if(listenerFromActivity!=null)
    {
      listener = listenerFromActivity;
    }
    else      
    {  
      if(CAFConfig.isEnableDebugging())
      {
        Log.d(TAG,"enableLightSensor Method");
        Log.d(TAG,"listenerFromActivity is null");
      }

    }
    mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);
    if(mSensorManager == null)
    {
      if(enableDebugging)
      {
        Log.d(TAG,"Light Sensor not found");
        Toast.makeText(this,"No Light Sensor found! quit-",Toast.LENGTH_SHORT).show();
      }
    }
    else
    {
      if(enableDebugging)
      {
        Log.d(TAG,"Light Sensor Found");
        Toast.makeText(mContext,"Light Sensor found",Toast.LENGTH_LONG).show();
      }
      try{
        mLight = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
        mSensorManager.registerListener(listener, mLight , sampleRate);
      }
      catch(Exception e)
      {
        e.printStackTrace();
      }
    }
  }

  /**
   * Method to disable Light Sensor in Android
   * @param listenerFromActivity 
   * */
  public void disableLightSensor(SensorEventListener listenerFromActivity)
  {
    try
    {
      if(mSensorManager != null)
      {
        if(listenerFromActivity!=null)
          mSensorManager.unregisterListener(listenerFromActivity);
        else
        {
          if(enableDebugging)
            Log.d(TAG,"listenerFromActivity is null");
        }
      }
    }
    catch(NullPointerException e)
    {
      e.printStackTrace();
    }
  }

}

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