B4A Library Geocoder library

Geocoder library

The Geocoder library enables you to geocode coordinates and reverse geocode addresses.

The library adds two new Objects to the IDE:

Version: 2.1

• Address
  Methods:
  • HasLatitude As Boolean
    Returns True if a latitude has been assigned to this Address, False otherwise.
  • HasLongitude As Boolean
    Returns True if a longitude has been assigned to this Address, False otherwise.
  • IsInitialized As Boolean
  Properties:
  • AddressLines As List [read only]
    Returns a List of Strings which are the address lines of the Address.
  • AdminArea As String [read only]
    Returns the administrative area name of the Address.
    For example, "CA", or Null if it is unknown.
  • CountryCode As String [read only]
    Returns the country code of the Address.
    For example "US", or Null if it is unknown.
  • CountryName As String [read only]
    Returns the localized country name of the Address.
    For example "Iceland", or Null if it is unknown.
  • FeatureName As String [read only]
    Returns the feature name of the Address.
    For example, "Golden Gate Bridge", or Null if it is unknown.
  • Latitude As Double [read only]
    Returns the latitude of the Address if known.
  • Locality As String [read only]
    Returns the locality of the Address.
    For example "Mountain View", or Null if it is unknown.
  • Longitude As Double [read only]
    Returns the longitude of the Address if known.
  • Phone As String [read only]
    Returns the phone number of the Address if known, or Null if it is unknown.
  • PostalCode As String [read only]
    Returns the postal code of the Address.
    For example "94110", or Null if it is unknown.
  • Premises As String [read only]
    Returns the premises of the Address, or Null if it is unknown.
  • SubAdminArea As String [read only]
    Returns the sub-administrative area name of the Address.
    For example, "Santa Clara County", or Null if it is unknown.
  • SubLocality As String [read only]
    Returns the sub-locality of the Address, or Null if it is unknown.
  • SubThoroughfare As String [read only]
    Returns the sub-thoroughfare name of the Address, or Null if it is unknown.
  • Thoroughfare As String [read only]
    Returns the thoroughfare name of the Address.
    For example, "1600 Ampitheater Parkway", or Null if it is unknown.
  • Url As String [read only]
    Returns the public URL for the Address, or Null if it is unknown.
• Geocoder
  Events:
  • GeocodeDone (Addresses() As Address, Tag As Object)
  Methods:
  • GetFromLocation (Latitude As Double, Longitude As Double, MaxResults As Int, Tag As Object)
    Gets an Array of Address objects that describe the area immediately surrounding the given Latitude and Longitude.
    The Array of Address objects is passed back to B4A in the GeocodeDone event along with the Tag Object.
    Tag is not used by this method, it is simply a means by which you can associate an identifying Object with this task.
  • GetFromLocationName (LocationName As String, MaxResults As Int, Tag As Object)
    Gets an Array of Address objects that describe the named location.
    LocationName may be a place name such as "Dalvik, Iceland", an address such as "1600 Amphitheatre Parkway, Mountain View, CA", an airport code such as "SFO", etc...
    The Array of Address objects is passed back to B4A in the GeocodeDone event along with the Tag Object.
    Tag is not used by this method, it is simply a means by which you can associate an identifying Object with this task.
  • GetFromLocationName2 (LocationName As String, MaxResults As Int, LowerLeftLatitude As Double, LowerLeftLongitude As Double, UpperRightLatitude As Double, UpperRightLongitude As Double, Tag As Object)
    Returns an array of Addresses that are known to describe the named location within the geographical bounds.
    LocationName may be a place name such as "Dalvik, Iceland", an address such as "1600 Amphitheatre Parkway, Mountain View, CA", an airport code such as "SFO", etc..
    The Array of Address objects is passed back to B4A in the GeocodeDone event along with the Tag Object.
    Tag is not used by this method, it is simply a means by which you can associate an identifying Object with this task.
  • Initialize (EventName As String)
    Initialize the Geocoder object with the device's system Locale.
  • Initialize2 (EventName As String, Language As String)
    Initialize the Geocoder object with a Locale based on Language.
  • Initialize3 (EventName As String, Language As String, Country As String)
    Initialize the Geocoder object with a Locale based on Language and Country.
  • IsInitialized As Boolean
  • IsPresent As Boolean
    Returns true if the Geocoder methods GetFromLocation and GetFromLocationName etc are implemented.
    Lack of network connectivity may still cause these methods to return null or empty lists.

If any of the three Geocoder methods Get??? fail then the GeocodeDone event will simply be passed an array of zero Address objects.
Any exceptions will be caught and sent to the log.

Library files and demo code attached.

Martin.

 

[Jorge M A]

Isn't this library capable of displaying GMT time ?

I don't know this library, but maybe you can see here:

[B4X] [class] Geodesic - Convert Lat Lon / UTM coordinates

The attached class allows you to convert coordinates between Lat Lon coordinates and UTM coordinates. The conversion is done with WGS84 datum. Note that the class code can handle other datums as well. Usage example: Sub Activity_Create(FirstTime As Boolean) Dim g As Geodesic...

www.b4x.com

[B4X] [class] Geodesic - Convert Lat Lon / UTM coordinates

There were reports of inaccurate results. I wasn't able to reproduce them. Make sure to test it thoroughly.