Android传感器API：近距离感应Proximity

/*
* 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.JavascriptInte**ce;
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 JavascriptInte**ce {

private static final String INTE**CE_NAME = "Proximity";
@Override
public String getInte**ceName() {
return mBrowser.application.resources.prefix + INTE**CE_NAME;
}
@Override
public JavascriptInte**ce getInheritInte**ce(RexseeBrowser childBrowser) {
return this;
}
@Override
public JavascriptInte**ce getNewInte**ce(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(getInte**ceName(), "Proximity sensor is not found.");
}
}
public void stop() {
if (isReady()) {
mSensorManager.unregisterListener(mSensorListener);
}
}

}

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