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Android GPS obtains the coordinates of the current longitude and latitude
In the APP, there may be a need to upload the coordinates of the current location to the server. Today, I provide three ways to obtain the coordinates of the longitude and latitude. The first is implem
conversion request sent first reaches the program. If there is no control, due to network reasons, it is possible that the data requested for conversion will arrive first. Program, so you do n’t know who responded to the returned data, that is, you ca n’t find the correspondence between the coordinates after correction and the coordinates before correction.
Use
=============== Problem description ====================
To convert the GPS coordinates collected by mobile phones to Baidu coordinates, I found the code on the Internet:
GeoPointgeoPoint3=newGeoPoint((int)((mLat1+0.001)*1E6),(int)((mLon1+0.003)*1E6));GeoPointGeoPointBaidu=CoordinateConvert.fromWgs84ToBaidu(geoPoint3);mOverlayList.add(newOverlayItem(GeoPointBaid
First you need to know the GPS coordinate system. The GPS coordinate system follows the WGS-84 standard, under which the GPS chip can emit different packet formats. The GPS data can be classified into Gpgga, Gpgsa, GPGSV, GPRMC and so on, according to the different frame-frame head of the data. These frame headers iden
Scenario: the longitude and latitude coordinates of two GPS points are known. Calculate the distance between two points.
1.Distance/latitude relationship
GPS: 22.514519, 113.380301
GPS: 22.511962, 113.380301
Distance: 284.6439379583341
Jl_wd = 284.6439379583341/(22.51451-22.511962)
= 111712.6915064105572998430141
should feel cool or feel tangled. (Android also provides a read NMEA interface, as the following says)
1. Android Positioning ServiceLet's look at Android's support for location-based services:
Android positioning services are located under the location, there are related instructions, here is not detailed analysis. There's one thing to talk about.Yes: Gpsst
Today, due to work needs, I took out a previously written GPS test program and modified it again. I wrote this program for 11 years. It was not long before I learned Android development. It was an experimental work. Work now needs to be done again. At the same time, I found that I do not know much about the GPS service of And
I have developed GPS-related embedded software for several years, So when talking about a program to test the GPS positioning module, the first reaction is to read the data from the GPS module through the serial port, and then parse the NMEA format data of GPS.
Today, due to work needs, I took out a previously written
As we all know, we need to simulate GPS on the simulator when we develop, we can always null in the location, check the Internet, and find the following solutions:
Online Warrior's Solution:
When acquiring GPS information on the simulator, the location loc = locationmanager.getlastknownlocation ("GPs") is used to obta
coordinates, it will not trigger.
onproviderdisabled (String provider):
This function is triggered when provider is disabled, such as GPS shutdown.
onproviderenabled (Sting provider):
Provider enabled is to trigger this function, such as GPS being opened.
onstatuschanged (String provider, int status, Bundle extras):
This function is triggered when the stat
GPS positioning is a more interesting function of smart phones, lbs and other services are effective use of GPS positioning function. This article will share with you the knowledge of GPS positioning in Android development.
First, Android Basics preparation
1, Activity Cla
:
* LocationManager.GPS_PROVIDER:GPS, high precision, but slow and consumption of electricity, and may be due to weather reasons or obstacles to obtain satellite information, the other equipment may not have GPS modules;
* Locationmanager.network_provider: Through the network to obtain positioning information, low precision, less power consumption, access to information faster, do not rely on GPS modules.
LBS (Location Based Services) is based on geographical service, there are at least two layers of meaning, the first to be able to easily obtain the current geographical location, such as latitude and longitude elevation, and the other is based on the current position to provide value-added services, such as to find nearby gas stations, Restaurants, hotels and so on. This is the first step: Get the user's current location, we can use the
) {String latlng;
if (location!= null) {Double lat = location.getlatitude ();
Double LNG = Location.getlongitude ();
LATLNG = "Latitude:" + Lat + "Longitude:" + LNG; else {latlng = ' Can ' t access your Location ";
LOG.I (TAG, "the location has changed ...");
LOG.I (TAG, "Your Location:" +LATLNG);
}
}
Only modifying the activity file is not enough, because the security of the Android system and the licensing mechanism for the service,
Recently in doing an Android project, need to use GPS to obtain location information, check from the API, found that access to location information only need a very simple sentence can:
Copy Code code as follows:
Getlastknownlocation (Locationmanager.gps_provider),
So happy. But in the code, the return value (Location type) is always null. It's so depressing. Check on the internet for
If you haven't deleted the mobile phone navigation, you will find that you haven't opened anything, but the mobile phone navigation in running services is on! I believe everyone has tried it. When I buy it, everyone only has mobile phone navigation customized.Positioning is not supported. In order to prevent everyone from using Google (Yumin + earning money), China Mobile removed the Google service package (GMS ).Is the most basic and important servic
To display Google Maps on the android client, you need to use Google's API. This time, Google is directly used instead of the android SDK. Because there is no detail, how many differences are there between them, it is not clear yet. Wait for a while and take a closer look. The view shown on the map is:Com. google. android. maps. if mapview is to be used, you have
When obtaining GPS information on the simulator, use location loc = locationmanager. getlastknownlocation ("GPS"); To obtain location information, but LOC is usually null in debugging, because you need to manually add GPS information to the simulator first, there are two ways to manually add1. In eclipse, manually set the longitude and latitude under windows -->
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