人的偏旁部首是什么:流氓 Android传感器API之:方向SensorOrientation传感器功能实现与源码分享

来源:百度文库 编辑:偶看新闻 时间:2024/05/03 03:11:04
继续明确一下空间坐标系的三个方向:
x 方向就是手机的水平方向,右为正;
y 方向就是手机的水平垂直方向,前为正;
z 方向就是手机的空间垂直方向,天空的方向为正,地球的方向为负。
方向角的定义是手机y轴 水平面上的投影 与 正北方向的夹角。 (值得范围是 0 ~ 359 其中0=North, 90=East, 180=South, 270=West)
倾斜角的定义是手机y轴 与水平面的夹角 (手机z轴向y轴方向移动为正 ,值得范围是 -180 ~ 180)
旋转角的定义是手机x轴 与水平面的夹角 (手机x轴离开z轴方向为正, 值得范围是 -90 ~ 90)
也就是说,当你把手机水平放置在桌面上(屏幕向上)且手机指向正北(Y轴方向),此时传感器获得的xyz三个值应该都为0。

如下是Rexsee实现的方向传感器功能源码。我会把Rexsee扩展的全部传感器源码都陆续贴出来,感兴趣的也可以直接去Rexsee社区查阅,反正都是开源的:http://www.rexsee.com。
但是首先需要知道,并不是所有的Android手机都支持方向传感器。。比如说乐Phone,好像就是加速度、重力和光线,方向和磁场貌似都不支持。
标签: Android SDK Rexsee

代码片段(1)

[代码] [HTML]代码

001/* 002* Copyright (C) 2011 The Rexsee Open Source Project 003* 004* Licensed under the Rexsee License, Version 1.0 (the "License"); 005* you may not use this file except in compliance with the License. 006* You may obtain a copy of the License at 007* 008*      http://www.rexsee.com/CN/legal/license.html 009* 010* Unless required by applicable law or agreed to in writing, software 011* distributed under the License is distributed on an "AS IS" BASIS, 012* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013* See the License for the specific language governing permissions and 014* limitations under the License. 015*/ 016  017package rexsee.sensor;  018  019import rexsee.core.browser.JavascriptInterface;  020import rexsee.core.browser.RexseeBrowser;  021import android.content.Context;  022import android.hardware.Sensor;  023import android.hardware.SensorEvent;  024import android.hardware.SensorEventListener;  025import android.hardware.SensorManager;  026  027public class RexseeSensorOrientation implements JavascriptInterface {  028  029       public static final String INTERFACE_NAME = "Orientation";  030       @Override  031       public String getInterfaceName() {  032               return mBrowser.application.resources.prefix + INTERFACE_NAME;  033       034       @Override  035       public JavascriptInterface getInheritInterface(RexseeBrowser childBrowser) {  036               return this;  037       038       @Override  039       public JavascriptInterface getNewInterface(RexseeBrowser childBrowser) {  040               return new RexseeSensorOrientation(childBrowser);  041       042  043       public static final String EVENT_ONORIENTATIONCHANGED = "onOrientationChanged";  044  045       private final Context mContext;  046       private final RexseeBrowser mBrowser;  047       private final SensorManager mSensorManager;  048       private SensorEventListener mSensorListener;  049       private final Sensor mSensor;  050  051       private int mRate = SensorManager.SENSOR_DELAY_NORMAL;  052       private int mCycle = 100; //milliseconds  053       private int mEventCycle = 100; //milliseconds  054  055       private float mAccuracyX = 0;  056       private float mAccuracyY = 0;  057       private float mAccuracyZ = 0;  058  059       private long lastUpdate = -1;  060       private long lastEvent = -1;  061  062       private float x = -999f;  063       private float y = -999f;  064       private float z = -999f;  065  066       public RexseeSensorOrientation(RexseeBrowser browser) {  067               mContext = browser.getContext();  068               mBrowser = browser;  069               browser.eventList.add(EVENT_ONORIENTATIONCHANGED);  070  071               mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);  072  073               mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);  074               mSensorListener = new SensorEventListener() {  075                       @Override  076                       public void onAccuracyChanged(Sensor sensor, int accuracy) {  077                       078                       @Override  079                       public void onSensorChanged(SensorEvent event) {  080                               if (event.sensor.getType() != Sensor.TYPE_ORIENTATION) return;  081                               long curTime = System.currentTimeMillis();  082                               if (lastUpdate == -1 || (curTime - lastUpdate) > mCycle) {  083                                       lastUpdate = curTime;  084                                       float lastX = x;  085                                       float lastY = y;  086                                       float lastZ = z;  087                                       x = event.values[SensorManager.DATA_X];  088                                       y = event.values[SensorManager.DATA_Y];  089                                       z = event.values[SensorManager.DATA_Z];  090                                       if (lastEvent == -1 || (curTime - lastEvent) > mEventCycle) {  091                                               if (  092                                                               (mAccuracyX >= 0 && Math.abs(x - lastX) > mAccuracyX)  093                                                                               || (mAccuracyY >= 0 && Math.abs(y - lastY) > mAccuracyY)  094                                                                               || (mAccuracyZ >= 0 && Math.abs(z - lastZ) > mAccuracyZ)  095                                                       ) {  096                                                               lastEvent = curTime;  097                                                               mBrowser.eventList.run(EVENT_ONORIENTATIONCHANGED);  098                                                       099                                               100                                       101                               102               };  103  104       105  106       public String getLastKnownX() {  107               return (x == -999) ? "null" : String.valueOf(x);  108       109       public String getLastKnownY() {  110               return (y == -999) ? "null" : String.valueOf(y);  111       112       public String getLastKnownZ() {  113               return (z == -999) ? "null" : String.valueOf(z);  114       115  116       public void setRate(String rate) {  117               mRate = SensorRate.getInt(rate);  118       119       public String getRate() {  120               return SensorRate.getString(mRate);  121       122       public void setCycle(int milliseconds) {  123               mCycle = milliseconds;  124       125       public int getCycle() {  126               return mCycle;  127       128       public void setEventCycle(int milliseconds) {  129               mEventCycle = milliseconds;  130       131       public int getEventCycle() {  132               return mEventCycle;  133       134       public void setAccuracy(float x, float y, float z) {  135               mAccuracyX = x;  136               mAccuracyY = y;  137               mAccuracyZ = z;  138       139       public float getAccuracyX() {  140               return mAccuracyX;  141       142       public float getAccuracyY() {  143               return mAccuracyY;  144       145       public float getAccuracyZ() {  146               return mAccuracyZ;  147       148  149       public boolean isReady() {  150               return (mSensor == null) ? false : true;  151       152       public void start() {  153               if (isReady()) {  154                       mSensorManager.registerListener(mSensorListener, mSensor, mRate);  155               } else {  156                       mBrowser.exception(getInterfaceName(), "Orientation sensor is not found.");  157               158       159       public void stop() {  160               if (isReady()) {  161                       mSensorManager.unregisterListener(mSensorListener);  162               163       164  165}