location | 易学教程

How to use the QML/QtLocation module for displaying a large amount of offline data on a map?

阅读更多关于 How to use the QML/QtLocation module for displaying a large amount of offline data on a map?

问题 I'm in the process of creating an offline Slippy Map using QML and their new QtLocation module (>=Qt5.4). I managed quite easily to display the tiles with an offline cache. Now I would like to add custom data to this map (a list of ~7000 airports). This huge list would have to be clustered depending on the zoom level (for performance and readability reasons, unless the QtLocation has built-in "optimizations"..?. What would be to most elegant/best way to achieve this, staying as close as

Android基站定位源代码

阅读更多关于 Android基站定位源代码

经过几天的调研以及测试，终于解决了联通2G、移动2G、电信3G的基站定位代码。团队里面只有这些机器的制式了。下面就由我来做一个详细的讲解吧。 1 相关技术内容 Google Android Api里面的TelephonyManager的管理。联通、移动、电信不同制式在获取基站位置的代码区别。通过基站的基本信息，通过Google Gears获取对应的GPS经纬度。通过Google Map API根据GPS经纬度获取当前位置。 2 目前存在的几个问题由于得到的GPS经纬度在Google Map上面显示需要偏移，这块暂时没有进行处理。没有使用PhoneStateListener来对状态实时进行更新。没有使用线程异步获取数据没有使用服务的方式来实时获取数据所以如果是商业使用的话，还需进一步修改。 3 当然本部分代码已经移植到我们的家庭卫士的项目中了，2提到的问题全部解决了。下面我针对第一部分的四大内容进行代码注解。 1 Google Android Api里面的TelephonyManager的管理。 TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); 通过这个方式就可以得到TelephonyManager接口。

iOS 6 AutoPause doesn't work

阅读更多关于 iOS 6 AutoPause doesn't work

问题 I've follow the example of AutoPause from " Session 303 - Staying on track from Location Services " WWDC 2012 In the example you can see how AutoPause is enabled and there two methods which are called: -(void) locationManagerDidPauseLocationUpdates:(CLLocationManager *)manager -(void) locationManagerDidResumeLocationUpdates:(CLLocationManager *)manager I've done the same example but these methods aren't never called. Who have tried the same? 回答1: I'm experimenting with that right now and here

Geofencing in background on Android 8 or 9 does not work

阅读更多关于 Geofencing in background on Android 8 or 9 does not work

问题 I try to make appear a push alert to the user when he reach a defined zone. So I coded my app from : https://developer.android.com/training/location/geofencing It is working perfectly if my app is running with a service following the location of the user. It also work if I start google map for example, that will track my location too. Pushes will appear. But if I close my app the push won't appear, so the geofencing is not detected if no app is tracking my location. Is it normal ? How to make

Find the location/Position of JFrame in the window

阅读更多关于 Find the location/Position of JFrame in the window

问题 I am trying to find the Starting location/position of the JFrame in order to map the mouse cursor from the JFrame window to desktop. Is there anyway to find the X,Y position of JFrame ? 回答1: You can use getLocation() or getLocationOnScreen() method of JFrame which are inherited from java.awt.Component. 回答2: you have to implement the MouseListener Interface and call the override methods public void mouseEntered(MouseEvent me) and use MouseEvent.getX(); MouseEvent.getXOnScreen(); 回答3: Jframe

Start location strategy

阅读更多关于 Start location strategy

问题 I am receiving periodically location updates via GPS, the problem is the time until the first location update occurs - it is just to long. When the user is within a building, this time gets even worser. Therefore I am looking for some strategies to improve the startup time (at the moment I don't use getLastKnownLocation but I will). I started reading A Deep Dive Into Location to get some ideas and have some thoughts now I would like to discuss with you. At first the blog post mentioned above

iOS Simulator Always resets Location to “None”

阅读更多关于 iOS Simulator Always resets Location to “None”

问题 I'm debugging a location-aware app, and getting frustrated with the iOS simulator. For some reason every time I run my app from Xcode the Location setting (under the Debug menu) resets to "None" (from "Custom Location…"). Anyone know how to prevent this? 回答1: In your project select edit scheme and go to the option tab. Edit default location to your liken. Check apple doc for other customizable option. If you want to create a permanent location create a GPX file with editor or online generator

Location headers in Laravel

阅读更多关于 Location headers in Laravel

问题 I'm working with a Library for my university's authentication system (Ucam_Webauth) which means I have to redirect to the authentication server in one of the methods. Unfortunately, I cannot return a Redirect:to() because of the architecture of this library. The library itself uses header('Location: ...'); but this isn't working for some reason. If I make the programme die(); after sending the header it works, but otherwise it doesn't. Any idea how I can fix this? 回答1: return redirect()->to(

CakePHP query closest latitude longitude from database

阅读更多关于 CakePHP query closest latitude longitude from database

问题 In a CakePHP (v3) application, how can I retrieve the closest results based on passed lat lng values? I'd like to have them back as native CakePHP entities, so something like this: public function closest($lat, $lng) { $sightings = //records within given lat lng $this->set(compact('sightings')); $this->set('_serialize', ['sightings']); } I know this SQL works: SELECT *, ( 3959 * acos( cos( radians(50.7) ) * cos( radians( latitude ) ) * cos( radians( longitude ) - radians(-1.8) ) + sin(

Android : Location.distanceTo not working correctly?

阅读更多关于 Android : Location.distanceTo not working correctly?

问题 I am having an issue calculating distance using the Location.distanceTo method. private class MyLocationOverlay1 extends MyLocationOverlay { @Override public void drawMyLocation(Canvas canvas, MapView mapView, Location lastFix, GeoPoint myLocation, long when) super.drawMyLocation(canvas,mapView,lastFix,myLocation,when); Location bLocation = new Location("reverseGeocoded"); bLocation.setLatitude(FindList.gpslat); // Value = 3.294391E7 bLocation.setLongitude(FindList.gpslong); // Value = -9