B4A Library Expanded Location Manager Library

lagore · Oct 20, 2012

Attached is an expanded version of XverhelstX excellent LocationManager library.
It adds new methods and extra functionality to the existing methods. There are many other methods as detailed on Android Dev which can be easily added if required.
The two significant new methods are "findLastLocation" & "addProximityAlert"
findLastLocation is handy when there is no network or gps (bear in mind the position may be way off) it can also return a location from 'passive' provider, this position is updated any time an app requests a position.
ProximityAlert generates an event anytime you cross the boundary as defined by a position and a radius, there are two different events; Enter & Exit.
RequestLocation (Network & GPS) should only be started once each, onResume they do not need to be called again as the Listener remains until the app is killed or the Stop method is called.
esLocation2
Author: Edward Smith
Version: 1

ESLocation2
Events:
- Locationchanged ( )
- Providerdisabled ( )
- Providerenabled ( )
- Proximityenter ( )
- Proximityexit ( )
- Statuschanged ( )
Methods:
- EndProximityAlert
  Removes the ProximityAlert pending intent
- Initialize (EventName As String)
  Common initialisations
  Example:<code>
  Dim MyLocation As ESLocation2
  MyLocation.Initialize("Location")</code>
  Can raise the following Events
  Locationchanged_Location
  Providerdisabled_Location
  Providerenabled_Location
  Statuschanged_Location
  Proximityenter_Location
  Proximityexit_Location
- addProximityAlert (Radius As Int, Lat As Double, Long As Double, Life As Long)
  Add Proximity Alert
  This method uses both Network and GPS to trigger the Alert, if there is no GPS
  fix then the Network fix will be used and will not be as accurate. This is a
  function of Android and cannot be changed.
  Radius: in meters
  Lat: positive values for north
  Long: negative values for west
  Life: this is the life of the pending Intent in milliseconds, use -1 for no expiration
- findLastLocation (providerType As String) As List
  Returns the Last Known Location in a 'List' containing:
  provider type
  Time of fix
  Latitude
  Longitude
  Accuracy
  Pass null to get a 'List' of all providers details
  providerType: This can be 'network', 'passive', 'gps' or null
- requestGPSLocation (mintime As Long, mindistance As Float)
  Starts a GPS Listener for position updates
  See the following Android Dev site <link>requestLocationUpdates|LocationManager | Android Developers, long, float, android.location.LocationListener)</link> for details
  mintime: minimum time interval between location updates, in milliseconds pass 0 for continuous updates
  minDistance: minimum distance between location updates, in meters pass 0 for continuous updates
- requestNetworkLocation (mintime As Long, mindistance As Float)
  Starts a Network Listener for position updates
  See the following Android Dev site <link>requestLocationUpdates|LocationManager | Android Developers, long, float, android.location.LocationListener)</link> for details
  mintime: minimum time interval between location updates, in milliseconds pass 0 for continuous updates
  minDistance: minimum distance between location updates, in meters pass 0 for continuous updates
- stopGPSListening
  Stops GPS Listener
- stopNetworkListening
  Stops Network Listener
Permissions:
- android.permission.ACCESS_COARSE_LOCATION
- android.permission.ACCESS_FINE_LOCATION

v1.1 added, no change to the methods but full annotation added to the @Events.

v1.2 sorted 'findLastLocation(String)' method, this now returns the request list based on the sent parameter e.g. 'network', 'gps', 'network' or null for all.

Cebuvi · Dec 18, 2014

Hi,

Is it possible to detect when the GPS is off?

Thanks

Cesar

Croïd · Dec 20, 2014

B4X:

If ..... = DialogResponse.POSITIVE Then

GPS = p.GetSettings("location_providers_allowed")

If GPS.IndexOf("gps")> -1 Then

Msgbox("GPS","OK !")

Else

Msgbox("Activate GPS ! ","Carefulness")

StartActivity(GPS.locationSettingsIntent)

Cebuvi · Dec 20, 2014

Croïd said:

B4X:

If ..... = DialogResponse.POSITIVE Then

GPS = p.GetSettings("location_providers_allowed")

If GPS.IndexOf("gps")> -1 Then

Msgbox("GPS","OK !")

Else

Msgbox("Activate GPS ! ","Carefulness")

StartActivity(GPS.locationSettingsIntent)

Thank you very much

peacemaker · Dec 24, 2014

Actually, in simplest way, most of app that needs LAST KNOWN coordinates - should have a class or lib, that has commands to:
* check and activate network location (WiFi and cell network), if avalable and allowed in the system settings; else return that not available, or not allowed
* check and activate GPS location, if avalable and allowed in the system settings; else return that not available, or not allowed
* command to get Last_known_location, by the date_time, among both above, and not important which

Such code module would be very ... interesting.

Croïd · Dec 26, 2014

Does that work for you? (version 4.4 may be not work !)

reply : OK works well android V4.4 & V5

coslad · Feb 8, 2015

Doesn't works on Note 3 kitkat, without gps doesn't gets coordinate

achtrade · Feb 19, 2015

Thomas Philip C said:
HI,

How can i clear an old location that was found . my app seems to record the last location. how would i make the app get the new location instead. (based on network network).

regards,
Tom

I'm getting this same error. How can we fix this ?

My apps is getting the first location but after I call lm.findLastLocation("null") every 5 seconds, the result is the same. I don't need the GPS/WIFI location, please help

B4X:

Sub Activity_Create(FirstTime As Boolean)
    lm.Initialize("Location")
    myList.Initialize
end 

Sub timer2_Tick
    myList = lm.findLastLocation("null")
    passiveLat = NumberFormat(myList.Get(7), 0, 9)
    passiveLong  = NumberFormat(myList.Get(8), 0, 9)
End Sub

hookshy · Feb 20, 2015

achtrade said:
My apps is getting the first location but after I call lm.findLastLocation("null") every 5 seconds, the result is the same. I don't need the GPS/WIFI location, please help

try to read myList size ...in this way you will find out that ..element number 7 and 8 does not exist
I am not the creator but I took some protections by code and try to read what is availlable

Mashiane · Nov 16, 2015

You can also use the GPS library here https://www.b4x.com/android/forum/threads/gps-tutorial.6592/#content to enable detection and turning on the gps if your app uses the gps functionality.

EduardoElias · Jan 13, 2019

I have a customer with a parking lot and want that people from the car ask for things to delivery to the car. So the guy park in a spot and using an app request stuff that will be taken to him. If I can triangulate with the Wifi antennas of that customer I could know in wich direction the car is parked.

Is it possible?

Erel · Jan 14, 2019

I recommend you to use FusedLocationProvider library.

B4A Library Expanded Location Manager Library

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