Android传感器API之：近距离感应Proximity功能源码

概述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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