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地图和GPS会是比较常用的一个功能了，网上能找到相当多的示例，同时几个地图引擎的公司也有开放他们的地图SDK，可以加以利用。这次是重点研究了基于Rexsee实现地图路线控制这个功能，分享出来。同时把Rexsee写的GPS功能源码也全部贴出来，有点多。看不明白的自己去Rexsee的社区：http://www.rexsee.com/
Rexsee在扩展中直接使用了高德的SDK，应该是合作关系吧。通过高德地图对象内的函数，可以很轻松的制作出类似谷歌地图这样的导航软件。对于高德地图对象，在使用前需要注意：所有的操作都必须先打开地图插件后才可以进行；在地图插件打开后，当数据没有在插件框体内加载完毕前关闭插件或按下回退键，极易造成程序崩溃。所以再打开插件的时候最好设置为不可回退取消。
插件窗口的设置十分讲究，首先我们需要考虑到屏幕的密度。拿现在主流的ANDROID手机来说，分辨率普遍在480*800,密度1.5。那么它的标准分辨率就应该是320*534。也就是说，320宽度的图片在我们的480*800的手机上宽度是帐号满屏的。
Rexsee因为是基于Web的开发，所以可以将程序做成全机型自动适配，那么在调整窗口的位置的时候就需要在位置上编写一定的逻辑。当然，屏幕像素获取方式不同，值也不同。直接用document.body.clientHeight之类的函数获得的是没有密度的分辨率，而用rexseeSreen对象获取到的则是带密度的，因为这里不能用百分比设定，而且插件窗口会盖住下面的浮出菜单。并且，在平板上，有的没有通知栏，或者通知栏在下面，有的需要减去通知栏的高度，有的则不需要。这都是需要去判断的。
当然在测试的时候可以先不管这些，随便设置一个就好。
rexseeMapAbc.start('window-cancelable:false;window-moveable:false;border-width:10px;border-color:#0000FF;window-align:center;window-vertical-align:top;width:'+Math.round(rexseeScreen.getScreenWidth()/rexseeScreen.getScreenDensityScale())+';height:'+Math.round(rexseeScreen.getScreenHeight()/(2*rexseeScreen.getScreenDensityScale()))+';window-modeless:true;window-dim-amount:0;');
基本操作中还包含了中心点设置，定位，路况。路况目前打开后无法消除。。。不知道为什么。
高德地图中的数据操作，导航操作，兴趣点操作返回值都是已数组的形式（前提是EVAL过）出现的，也就是所在导航时有多条路供选择，随后有一个实例，当然，本人很偷懒的默认第一条线路。实例和教程随后会一起放出，当然大家可以自行改动。由于导航需要提供2地的经纬度，所以请大家配合数据转换中的地名获得目的地信息的函数方法使用，当然最好是限制经纬度范围，否则必须要拼写详细，如XX省XX市XX地名。请求出来的则是数跳线路，请根据需要取其中的1条或生成选择菜单。
function getRoute()
{
rexseeMapAbc.hideRoute();
var places=eval('('+prompt('prompt','title=导航输入框;message=请输入起始地和目的地：;options=起始地：|目的地：;defaultValue=北京市北京西站|北京市北京南站;inputType=text|text;')+')');
var startPlace=places[0];
var endPlace=places[1];
var tempsp=eval('('+rexseeMapAbc.getAddressFromLocationName(startPlace,1)+')');
var tempep=eval('('+rexseeMapAbc.getAddressFromLocationName(endPlace,1)+')');
var splong=tempsp[0].Longitude+"";
var splat=tempsp[0].Latitude+"";
//alert(splong+" "+splat);
var eplong=tempep[0].Longitude+"";
var eplat=tempep[0].Latitude+"";
rexseeMapAbc.requestRoute('routeRequest01',splong,splat,eplong,eplat,role);
}
function onRouteReady(id){
// alert(rexseeMapAbc.getRequesedRoute(id));
var temps=rexseeMapAbc.getRequestedRoute(id);
//temps = temps.replace(/\r\n","");
temps = temps.replace(/\n/g,"");
temps = temps.replace(/\r/g,"");
// alert(temps);
temps=eval('('+temps+')');
// alert(temps.length);
var longs=temps[0].startLongitude;
var lat=temps[0].startLatitude;
// alert(long+" "+lat);
rexseeMapAbc.setCenter(longs,lat);
rexseeMapAbc.showRoute(id,0)
}
兴趣点的控制和路线控制属于同一个，如果关闭兴趣点，那么地图上的导航线也会一起消失。高德地图如果配合GPS使用的话，需要按照国家标准偏移，请偏移后（对象有提供相应函数）再进行定位，否则会有偏差。
还要注意：提供经纬度作为参数时，请先转换为字符串，不然偏差很大。
最后是Rexsee写的原生GPS源码，搞原生的可以直接看这个
/*
* 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.location;
import java.io.IOException;
import java.util.List;
import rexsee.core.browser.JavascriptInterface;
import rexsee.core.browser.RexseeBrowser;
import rexsee.core.browser.ActivityResult.ActivityResultListener;
import rexsee.core.utilities.RexseeUtilities;
import android.content.Context;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
mport android.os.Bundle;
import android.provider.Settings;
public class RexseeGps implements JavascriptInterface {
private static final String INTERFACE_NAME = "Gps";
@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 RexseeGps(childBrowser);
}
public static final String EVENT_ONGPSSETTINGSUCCESSED = "onGpsSettingSuccessed";
public static final String EVENT_ONGPSSETTINGFAILED = "onGpsSettingFailed";
public static final String EVENT_ONGPSENABLED = "onGpsEnabled";
public static final String EVENT_ONGPSDISABLED = "onGpsDisabled";
public static final String EVENT_ONGPSSTATUSCHANGED = "onGpsStatusChanged";
public static final String EVENT_ONGPSLOCATIONCHANGED = "onGpsLocationChanged";
public static String address2Json(Address address) {
if (address == null) return "{}";
String rtn = "";
rtn += "{";
rtn += "\"Premises\":\"" + address.getPremises() + "\""; //Type of the location. Cross, road or POI.
rtn += ",\"Latitude\":" + address.getLatitude();
rtn += ",\"Longitude\":" + address.getLongitude();
rtn += ",\"address\":[";
for (int j = 0; j < address.getMaxAddressLineIndex(); j++) {
if (j != 0) rtn += ",";
rtn += "\"" + address.getAddressLine(j) + "\"";
}
rtn += "]";
rtn += ",\"CountyCode\":\"" + address.getCountryCode() + "\"";
rtn += ",\"CountryName\":\"" + address.getCountryName() + "\"";
rtn += ",\"AdminArea\":\"" + address.getAdminArea() + "\"";
rtn += ",\"SubAdminArea\":\"" + address.getSubAdminArea() + "\"";
rtn += ",\"Locality\":\"" + address.getLocality() + "\"";
//rtn += ",\"SubLocality\":\"" + address.getSubLocality() + "\"";Not support SDK3
rtn += ",\"Thoroughfare\":\"" + address.getThoroughfare() + "\"";
//rtn += ",\"SubThoroughfare\":\"" + address.getSubThoroughfare() + "\"";Not support SDK3
rtn += ",\"PostalCode\":\"" + address.getPostalCode() + "\"";
rtn += ",\"FeatureName\":\"" + address.getFeatureName() + "\"";
rtn += ",\"Phone\":\"" + address.getPhone() + "\"";
//rtn += ",\"Premises\":\"" + address.getPremises() + "\"";Not support SDK3
rtn += ",\"Url\":\"" + address.getUrl() + "\"";
rtn += ",\"Language\":\"" + address.getLocale().getDisplayLanguage() + "\"";
rtn += "}";
return rtn;
}
public static String addresses2Json(List<Address> addresses) {
String rtn = "[";
for (int i = 0; i < addresses.size(); i++) {
if (i != 0) rtn += ",";
rtn += address2Json(addresses.get(0));
}
rtn += "]";
return rtn;
}
private int minUpdateDuration = 60;
private int minUpdateDistance = 500;
private final Context mContext;
private final RexseeBrowser mBrowser;
private final LocationListener mListener;
public RexseeGps(final RexseeBrowser browser) {
mContext = browser.getContext();
mBrowser = browser;
browser.eventList.add(EVENT_ONGPSSETTINGSUCCESSED);
browser.eventList.add(EVENT_ONGPSSETTINGFAILED);
browser.eventList.add(EVENT_ONGPSENABLED);
browser.eventList.add(EVENT_ONGPSDISABLED);
browser.eventList.add(EVENT_ONGPSSTATUSCHANGED);
browser.eventList.add(EVENT_ONGPSLOCATIONCHANGED);
browser.destroyListeners.add(new Runnable() {
@Override
public void run() {
stop();
}
});
mListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
if (browser != null) {
browser.eventList.run(EVENT_ONGPSLOCATIONCHANGED, new String[]{
String.valueOf(location.getTime()),
String.valueOf(location.getAccuracy()),
String.valueOf(location.getLongitude()),
String.valueOf(location.getLatitude()),
String.valueOf(location.getSpeed()),
String.valueOf(location.getBearing()),
String.valueOf(location.getAltitude())
});
}
}
@Override
public void onProviderDisabled(String provider) {
if (browser != null) {
browser.eventList.run(EVENT_ONGPSDISABLED);
}
}
@Override
public void onProviderEnabled(String provider) {
if (browser != null) {
browser.eventList.run(EVENT_ONGPSENABLED);
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
if (browser != null) {
browser.eventList.run(EVENT_ONGPSSTATUSCHANGED, new String[]{String.valueOf(status)});
}
}
};
}
//JavaScript Interface
public boolean isReady() {
return (((LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE)).isProviderEnabled(LocationManager.GPS_PROVIDER)) ? true : false;
}
public void openSettings() {
Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS);
mBrowser.activityResult.start(intent, new ActivityResultListener() {
@Override
public void run(int resultCode, Intent resultIntent) {
if (isReady()) {
mBrowser.eventList.run(EVENT_ONGPSSETTINGSUCCESSED);
} else {
mBrowser.eventList.run(EVENT_ONGPSSETTINGFAILED);
}
}
});
}
public void start() {
if (isReady()) {
LocationManager locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minUpdateDuration * 1000, minUpdateDistance, mListener);
} else {
mBrowser.exception(getInterfaceName(), "GPS is not available.");
}
}
public void stop() {
try {
((LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE)).removeUpdates(mListener);
} catch (Exception e) {
}
}
public void setMinimumUpdateDuration(int seconds) {
minUpdateDuration = seconds;
}
public int getMinimumUpdateDuration() {
return minUpdateDuration;
}
public void setMinimumUpdateDistance(int meter) {
minUpdateDistance = meter;
}
public int getMinimumUpdateDistance() {
return minUpdateDistance;
}
public String getLastKnownLocation() {
if (!isReady()) return "{}";
try {
Location location = ((LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE)).getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null) return "";
String rtn = "{";
rtn += "\"time\":" + location.getTime();
rtn += ",\"accuracy\":" + location.getAccuracy();
rtn += ",\"longitude\":" + location.getLongitude();
rtn += ",\"latitude\":" + location.getLatitude();
rtn += ",\"speed\":" + location.getSpeed();
rtn += ",\"bearing\":" + location.getBearing();
rtn += ",\"altitude\":" + location.getAltitude();
rtn += "}";
return rtn;
} catch (Exception e) {
mBrowser.exception(getInterfaceName(), e);
return "{}";
}
}
public String getLastKnownGeo(int maxNumber) {
if (!isReady()) return "[]";
try {
Location location = ((LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE)).getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null) return "";
Geocoder geo = new Geocoder(mContext);
List<Address> addresses = geo.getFromLocation(location.getLatitude(), location.getLongitude(), maxNumber);
return addresses2Json(addresses);
} catch (IOException e) {
mBrowser.exception(getInterfaceName(), e);
return "[]";
}
}
public float getDistanceBetween(String startLongitude, String startLatitude, String endLongitude, String endLatitude) {
double sLatitude = RexseeUtilities.getDouble(startLatitude, 0);
double sLongitude = RexseeUtilities.getDouble(startLongitude, 0);
double eLatitude = RexseeUtilities.getDouble(endLatitude, 0);
double eLongitude = RexseeUtilities.getDouble(endLongitude, 0);
float results[] = new float[3];
Location.distanceBetween(sLatitude, sLongitude, eLatitude, eLongitude, results);
return results[0];
}
} |
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发表于 2011-12-8 15:27:06
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