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Android传感器API之：加速度Accelerometer功能源码

加速度传感器，主要是感应手机的运动。捕获三个参数，分别表示空间坐标系中X、Y、Z轴方向上的加速度减去重力加速度在相应轴上的分量，其单位均为m/s2。和之前几篇传感器功能介绍中的一样，这几个方向就不再多说了~~

Rexsee的源码如下，有兴趣的朋友可以再去找找，社区公开的源码里有包括加速度在内的，重力、磁场、温度、距离和方向等传感器功能。http://www.

/*

* 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.

*

* 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 RexseeSensorAccelerometer implements JavascriptInterface {

private static final String INTERFACE_NAME = "Accelerometer";

@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 RexseeSensorAccelerometer(childBrowser);

}

public static final String EVENT_ONACCELERATE = "onAccelerometerChanged";

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;

private int mEventCycle = 100;

private float mAccuracyX = 0;

private float mAccuracyY = 0;

private float mAccuracyZ = 0;

private long lastUpdate = -1;

private long lastEvent = -1;

private float x = -999, y = -999, z = -999;

public RexseeSensorAccelerometer(RexseeBrowser browser) {

mContext = browser.getContext();

mBrowser = browser;

browser.eventList.add(EVENT_ONACCELERATE);

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

mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

mSensorListener = new SensorEventListener() {

@Override

public void onAccuracyChanged(Sensor sensor, int accuracy) {

}

@Override

public void onSensorChanged(SensorEvent event) {

if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER) return;

long curTime = System.currentTimeMillis();

if (lastUpdate == -1 || (curTime - lastUpdate) > mCycle) {

lastUpdate = curTime;

float lastX = x;

float lastY = y;

float lastZ = z;

x = event.values[SensorManager.DATA_X];

y = event.values[SensorManager.DATA_Y];

z = event.values[SensorManager.DATA_Z];

if (lastEvent == -1 || (curTime - lastEvent) > mEventCycle) {

if (

(mAccuracyX >= 0 && Math.abs(x - lastX) > mAccuracyX)

|| (mAccuracyY >= 0 && Math.abs(y - lastY) > mAccuracyY)

|| (mAccuracyZ >= 0 && Math.abs(z - lastZ) > mAccuracyZ)

) {

lastEvent = curTime;

mBrowser.eventList.run(EVENT_ONACCELERATE);

}

}

}

}

};

}

public String getLastKnownX() {

return (x == -999) ? "null" : String.valueOf(x);

}

public String getLastKnownY() {

return (y == -999) ? "null" : String.valueOf(y);

}

public String getLastKnownZ() {

return (z == -999) ? "null" : String.valueOf(z);

}

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 x, float y, float z) {

mAccuracyX = x;

mAccuracyY = y;

mAccuracyZ = z;

}

public float getAccuracyX() {

return mAccuracyX;

}

public float getAccuracyY() {

return mAccuracyY;

}

public float getAccuracyZ() {

return mAccuracyZ;

}

public boolean isReady() {

return (mSensor == null) ? false : true;

}

public void start() {

if (isReady()) {

mSensorManager.registerListener(mSensorListener, mSensor, mRate);

} else {

mBrowser.exception(getInterfaceName(), "Accelerometer is not found.");

}

}

public void stop() {

if (isReady()) {

mSensorManager.unregisterListener(mSensorListener);

}

}

}