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Android传感器API之:近距离感应Proximity功能源码

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/* 
* Copyright (C) 2011 The Rexsee Open Source Project 
* 
* Licensed under the Rexsee License, Version 1.0 (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.rexsee.com/CN/legal/license.html 
* 
* 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. 
*/ 

package rexsee.sensor;  

import rexsee.core.browser.JavascriptInterface;  
import rexsee.core.browser.RexseeBrowser;  
import android.content.Context;  
import android.hardware.Sensor;  
import android.hardware.SensorEvent;  
import android.hardware.SensorEventListener;  
import android.hardware.SensorManager;  

public class RexseeSensorProximity implements JavascriptInterface {  

       private static final String INTERFACE_NAME = "Proximity";  
       @Override  
       public String getInterfaceName() {  
               return mBrowser.application.resources.prefix + INTERFACE_NAME;  
       }  
       @Override  
       public JavascriptInterface getInheritInterface(RexseeBrowser childBrowser) {  
               return this;  
       }  
       @Override  
       public JavascriptInterface getNewInterface(RexseeBrowser childBrowser) {  
               return new RexseeSensorProximity(childBrowser);  
       }  

       public static final String EVENT_ONPROXIMITYCHANGED = "onProximityChanged";  

       private final Context mContext;  
       private final RexseeBrowser mBrowser;  
       private final SensorManager mSensorManager;  
       private final SensorEventListener mSensorListener;  
       private final Sensor mSensor;  

       private int mRate = SensorManager.SENSOR_DELAY_NORMAL;  
       private int mCycle = 100; //milliseconds  
       private int mEventCycle = 100; //milliseconds  
       private float mAccuracy = 0;  

       private long lastUpdate = -1;  
       private long lastEvent = -1;  

       private float value = -999f;  

       public RexseeSensorProximity(RexseeBrowser browser) {  
               mContext = browser.getContext();  
               mBrowser = browser;  
               browser.eventList.add(EVENT_ONPROXIMITYCHANGED);  

               mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);  

               mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);  

               mSensorListener = new SensorEventListener() {  
                       @Override  
                       public void onAccuracyChanged(Sensor sensor, int accuracy) {  
                       }  
                       @Override  
                       public void onSensorChanged(SensorEvent event) {  
                               if (event.sensor.getType() != Sensor.TYPE_PROXIMITY) return;  
                               long curTime = System.currentTimeMillis();  
                               if (lastUpdate == -1 || (curTime - lastUpdate) > mCycle) {  
                                       lastUpdate = curTime;  
                                       float lastValue = value;  
                                       value = event.values[SensorManager.DATA_X];  
                                       if (lastEvent == -1 || (curTime - lastEvent) > mEventCycle) {  
                                               if (Math.abs(value - lastValue) > mAccuracy) {  
                                                       lastEvent = curTime;  
                                                       mBrowser.eventList.run(EVENT_ONPROXIMITYCHANGED);  
                                               }  
                                       }  
                               }  
                       }  
               };  

       }  

       public String getLastKnownValue() {  
               return (value == -999) ? "null" : String.valueOf(value);  
       }  

       public void setRate(String rate) {  
               mRate = SensorRate.getInt(rate);  
       }  
       public String getRate() {  
               return SensorRate.getString(mRate);  
       }  
       public void setCycle(int milliseconds) {  
               mCycle = milliseconds;  
       }  
       public int getCycle() {  
               return mCycle;  
       }  
       public void setEventCycle(int milliseconds) {  
               mEventCycle = milliseconds;  
       }  
       public int getEventCycle() {  
               return mEventCycle;  
       }  
       public void setAccuracy(float value) {  
               mAccuracy = Math.abs(value);  
       }  
       public float getAccuracy() {  
               return mAccuracy;  
       }  

       public boolean isReady() {  
               return (mSensor == null) ? false : true;  
       }  
       public void start() {  
               if (isReady()) {  
                       mSensorManager.registerListener(mSensorListener, mSensor, mRate);  
               } else {  
                       mBrowser.exception(getInterfaceName(), "Proximity sensor is not found.");  
               }  
       }  
       public void stop() {  
               if (isReady()) {  
                       mSensorManager.unregisterListener(mSensorListener);  
               }  
       }  

}

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