Android传感器API之：温度传感器SensorTemperature功能源码 - 中科因仑“3+1”工程特种兵精英论坛

[size=1em][size=1em]/*
[size=1em]* Copyright (C) 2011 The Rexsee Open Source Project
[size=1em]*
[size=1em]* Licensed under the Rexsee License, Version 1.0 (the "License");
[size=1em]* you may not use this file except in compliance with the License.
[size=1em]* You may obtain a copy of the License at
[size=1em]*
[size=1em]*    http://www.rexsee.com/CN/legal/license.html
[size=1em]*
[size=1em]* Unless required by applicable law or agreed to in writing, software
[size=1em]* distributed under the License is distributed on an "AS IS" BASIS,
[size=1em]* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
[size=1em]* See the License for the specific language governing permissions and
[size=1em]* limitations under the License.
[size=1em]*/
[size=1em]
[size=1em]package rexsee.sensor;
[size=1em]
[size=1em]import rexsee.core.browser.JavascriptInterface;
[size=1em]import rexsee.core.browser.RexseeBrowser;
[size=1em]import android.content.Context;
[size=1em]import android.hardware.Sensor;
[size=1em]import android.hardware.SensorEvent;
[size=1em]import android.hardware.SensorEventListener;
[size=1em]import android.hardware.SensorManager;
[size=1em]
[size=1em]public class RexseeSensorTemperature implements JavascriptInterface {
[size=1em]
[size=1em]    private static final String INTERFACE_NAME = "Temperature";
[size=1em]    @Override
[size=1em]    public String getInterfaceName() {
[size=1em]             return mBrowser.application.resources.prefix + INTERFACE_NAME;
[size=1em]    }
[size=1em]    @Override
[size=1em]    public JavascriptInterface getInheritInterface(RexseeBrowser childBrowser) {
[size=1em]             return this;
[size=1em]    }
[size=1em]    @Override
[size=1em]    public JavascriptInterface getNewInterface(RexseeBrowser childBrowser) {
[size=1em]             return new RexseeSensorTemperature(childBrowser);
[size=1em]    }
[size=1em]
[size=1em]    public static final String EVENT_ONTEMPERATURECHANGED = "onTemperatureChanged";
[size=1em]
[size=1em]    private final Context mContext;
[size=1em]    private final RexseeBrowser mBrowser;
[size=1em]    private final SensorManager mSensorManager;
[size=1em]    private final SensorEventListener mSensorListener;
[size=1em]    private final Sensor mSensor;
[size=1em]
[size=1em]    private int mRate = SensorManager.SENSOR_DELAY_NORMAL;
[size=1em]    private int mCycle = 100; //milliseconds
[size=1em]    private int mEventCycle = 100; //milliseconds
[size=1em]    private float mAccuracy = 0;
[size=1em]
[size=1em]    private long lastUpdate = -1;
[size=1em]    private long lastEvent = -1;
[size=1em]
[size=1em]    private float value = -999f;
[size=1em]
[size=1em]    public RexseeSensorTemperature(RexseeBrowser browser) {
[size=1em]             mContext = browser.getContext();
[size=1em]             mBrowser = browser;
[size=1em]             browser.eventList.add(EVENT_ONTEMPERATURECHANGED);
[size=1em]
[size=1em]             mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);
[size=1em]
[size=1em]             mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_TEMPERATURE);
[size=1em]
[size=1em]             mSensorListener = new SensorEventListener() {
[size=1em]                      @Override
[size=1em]                      public void onAccuracyChanged(Sensor sensor, int accuracy) {
[size=1em]                      }
[size=1em]                      @Override
[size=1em]                      public void onSensorChanged(SensorEvent event) {
[size=1em]                            if (event.sensor.getType() != Sensor.TYPE_TEMPERATURE) return;
[size=1em]                            long curTime = System.currentTimeMillis();
[size=1em]                            if (lastUpdate == -1 || (curTime - lastUpdate) > mCycle) {
[size=1em]                                     lastUpdate = curTime;
[size=1em]                                     float lastValue = value;
[size=1em]                                     value = event.values[SensorManager.DATA_X];
[size=1em]                                     if (lastEvent == -1 || (curTime - lastEvent) > mEventCycle) {
[size=1em]                                              if (Math.abs(value - lastValue) > mAccuracy) {
[size=1em]                                                    lastEvent = curTime;
[size=1em]                                                    mBrowser.eventList.run(EVENT_ONTEMPERATURECHANGED);
[size=1em]                                              }
[size=1em]                                     }
[size=1em]                            }
[size=1em]                      }
[size=1em]             };
[size=1em]
[size=1em]    }
[size=1em]
[size=1em]    public String getLastKnownValue() {
[size=1em]             return (value == -999) ? "null" : String.valueOf(value);
[size=1em]    }
[size=1em]
[size=1em]    public void setRate(String rate) {
[size=1em]             mRate = SensorRate.getInt(rate);
[size=1em]    }
[size=1em]    public String getRate() {
[size=1em]             return SensorRate.getString(mRate);
[size=1em]    }
[size=1em]    public void setCycle(int milliseconds) {
[size=1em]             mCycle = milliseconds;
[size=1em]    }
[size=1em]    public int getCycle() {
[size=1em]             return mCycle;
[size=1em]    }
[size=1em]    public void setEventCycle(int milliseconds) {
[size=1em]             mEventCycle = milliseconds;
[size=1em]    }
[size=1em]    public int getEventCycle() {
[size=1em]             return mEventCycle;
[size=1em]    }
[size=1em]    public void setAccuracy(float value) {
[size=1em]             mAccuracy = Math.abs(value);
[size=1em]    }
[size=1em]    public float getAccuracy() {
[size=1em]             return mAccuracy;
[size=1em]    }
[size=1em]
[size=1em]    public boolean isReady() {
[size=1em]             return (mSensor == null) ? false : true;
[size=1em]    }
[size=1em]    public void start() {
[size=1em]             if (isReady()) {
[size=1em]                      mSensorManager.registerListener(mSensorListener, mSensor, mRate);
[size=1em]             } else {
[size=1em]                      mBrowser.exception(getInterfaceName(), "Temperature sensor is not found.");
[size=1em]             }
[size=1em]    }
[size=1em]    public void stop() {
[size=1em]             if (isReady()) {
[size=1em]                      mSensorManager.unregisterListener(mSensorListener);
[size=1em]             }
[size=1em]    }
[size=1em]
[size=1em]}