location | 易学教程

Android: location detection by Cellular Network and WiFi

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问题 I would like to build a app which will provide current location using cellular Network and WiFi . I like to get location from both provider simultaneously and then decide which provider give me best. Now i am getting location from Network LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); LocationListener locationlistenerforNetwork = new mylocationlistenerNetwork(); lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationlistenerforNetwork);

Android: distanceTo() wrong values

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问题 I am writing an application for tracking my route. I am requesting updates from GPS every minute and it works fine. It shows me my exact point. When I want to calculate distance between current point and previous one it works ok, but form time to time it calculates distance totaly wrong (I moved about 200m and it retuned me a value over 10km). Does anyone know why this could happen? Here is the function which I use: iRoute += myGPSLocation.distanceTo(prevLocation); Thanks in advance! 回答1:

Google Maps + Geo-location w/ SQL

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问题 I have a script that displays a bunch of addresses in a SQL database (They're all geocoded) and places them onto a google map. I can't seem to figure out how to have the map center on the user's location using their mobile device GPS. I have a script that does this but I can't figure out how to combine the two features. Anyone? Please help me, loosing sleep... Here is my code: <?php require_once('/home/session_data.php'); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www

How to email CLLocationCoordinate2D as a link

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问题 I am trying to emulate the Maps 'Share Location' via email functionality. I have the latitude and longitude of my location and am currently using it to display the location on a map via MKMapView. I also have functionality that composes an email from the app and I would like to include the location in it but can not figure out how to construct a link, using the longitude and latitude. I have seen other apps with apps with this functionality so I know it is possible. Any help would be much

Javascript Google map api V3 fitbounds with center location

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问题 I want to fitbound pushpins to visible all around user's location pushpin. i wrote the following code it center the user location but few pushpin goes out of map ?? FYI: userPinLoc is pushpin object which is already populated function setInitialZoom() { mapZoom = googleMap.getZoom(); var bounds = new google.maps.LatLngBounds(); bounds.extend(userPinLoc); for (i in nearestEntitiesToZoom) { entity = nearestEntitiesToZoom[i]; var googleLatLng = new google.maps.LatLng(entity.latitude,entity

Getting nearest bus stations from Google Map inside Android Application

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问题 I am working on an Android application in which I need to achieve the following goals. Get the current position(co-ordinates) of the device - Done Search within a given radius centering the device position for the nearest bus stations and List them. I need help on the second thing. Is there any way to get the Nearest bus stations from the Google Map inside an android application? Can I use Google Places API to achieve this?(the official page says that it's still experimental). If yes, how?

DOM-BOM-EVENT（6）

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6.BOM 6.1.什么是BOM？ BOM(Browse Object Model),浏览器对象模型，没有相关标准，是约定俗成的东西，定义了一些操作浏览器的方法和属性，大部分方法都是通过window对象来调用的，window对象是浏览器端的最顶层的对象 6.2.open方法 open方法可以用来打开一个新的窗口(页面) var w = open(页面url地址，打开的方式) 注意：如果url为空，默认打开一个空白页面如果打开方式为空，默认为新窗口方式打开返回值：新打开窗口的window对象 window.open("http://nodeing.com") window.open("http://nodeing.com", "_self") 打开新窗口后可以操作页面 var w = open() w.document.body.style.backgroundColor = "#009f95" 6.3.close方法 <button id="op">打开窗口</button> <button id="cls">关闭</button> <script> var opBtn = document.getElementById("op") var clsBtn = document.getElementById("cls") var w = null; opBtn.onclick

Get Phone region name programmatically

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问题 I have to get phone no region (means from which region this no belongs) programmatically. I searched lot and didn't find anyway then I thought to get current location through network provider name but it return city name. Actually 1st I have to get phone no region if it not possible then through network provider how can we get region of current location. Please suggest me. 回答1: Try Telephony Service. TelephonyManager telman=(TelephonyManager) getSystemService(TELEPHONY_SERVICE); a lot of info

Cannot get the coordinates of location using App Inventor

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问题 I am making an app in App Inventor that requires location of the user. However, sometimes location is shown as longitude=0 , latitude=0 and No address is available . I don't know why it's working at some locations and not at all the locations. Get Altitude in App Inventor I have tried the suggestions given in the above link, but no use. Finally, I have decided to get the coordinates from the map. For that I have tried the instructions given in the below link. How do I let the user choose a

distance between two locations is not right?

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问题 i get two locations using this : LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); then i compute the distance between them , but the distance is not true public static float calculateDistance(double e, double f, double g, double h) { float dLat = (float) Math.toRadians(g - e); float dLon = (float) Math.toRadians(h - f); float a = (float) (Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(Math.toRadians(e)) * Math.cos(Math.toRadians(g)) *