iOS Question iterate over markers

[Tomeu Payeras]

Hi,

when I try to iterate over markers in a GoogleMap I got this error message during compilation:

use of undeclared identifier 'GMSMarker'; did you mean 'B4IMarker'?

my code is something like this

Public gmap as GoogleMap
gmap.Initialize("gmap",ApiKey)

'some markers added (and correctly displayed)

For Each m As Marker in gmap   '<---this is the line with the compilation error
...
Next

Any help?

 

[Erel]

gmap is not a collection of markers. The code you posted cannot work.

Whenever you add a marker to the map, add it to a List as well. Then you will be able to iterate over the List items.

 

[Tomeu Payeras]

Thank you. I have tested with a List and the error messages is the same:

B4i line: 55
For Each mk As Marker In mlist
use of undeclared identifier 'GMSMarker'; did you mean 'B4IMarker'?

This is the code, based on GoogleMaps tutorial sample:

#Region  Project Attributes 
    #ApplicationLabel: B4i Example
    #Version: 1.0.0 
    'Orientation possible values: Portrait, LandscapeLeft, LandscapeRight and PortraitUpsideDown
    #iPhoneOrientations: Portrait, LandscapeLeft, LandscapeRight
    #iPadOrientations: Portrait, LandscapeLeft, LandscapeRight, PortraitUpsideDown
    #PlistExtra:<key>NSLocationWhenInUseUsageDescription</key><string>Used to display the current navigation data.</string>
    #PlistExtra:<key>NSLocationUsageDescription</key><string>Used to display the current navigation data.</string>
#End Region

Sub Process_Globals
    Public App As Application
    Public NavControl As NavigationController
    Private Page1 As Page
    Private gmap As GoogleMap
    Private ApiKey As String = "**********"
    Public mlist As List
End Sub

Private Sub Application_Start (Nav As NavigationController)
    NavControl = Nav
    Page1.Initialize("Page1")
    Page1.Title = "Page 1"
    Page1.RootPanel.Color = Colors.White
    NavControl.ShowPage(Page1)
    AddMap
    removeMarkers
End Sub


Private Sub AddMap
    gmap.Initialize("gmap", ApiKey)
    Page1.RootPanel.AddView(gmap, 0, 0, 100%X, 100%y)
    gmap.MapType = gmap.MAP_TYPE_TERRAIN
   
    mlist.Initialize    
   
    'add three markers
    Dim m As Marker = gmap.AddMarker(40, 30, "test")
    m.Snippet = "Marker 1"
    m.Opacity = 0.5
    mlist.Add(m)
    m = gmap.AddMarker2(40, 31, "Marker 2", Colors.Green)
    mlist.Add(m)
    gmap.AddMarker3(20, 20, "ddd", LoadBitmap(File.DirAssets, "up76.png"))
    mlist.Add(m)
End Sub

Private Sub Page1_Resize(Width As Int, Height As Int)
    If gmap.IsInitialized Then gmap.SetLayoutAnimated(0, 1, 0, 0, Width, Height)
End Sub

Sub removeMarkers
    For Each mk As Marker In mlist
        mk.Remove
    Next
End Sub

 

[Erel]

It is a bug in the GoogleMaps library. It is fixed in v1.01: https://www.b4x.com/android/forum/threads/updates-to-internal-libraries.48179/#post-310024

 

[Tomeu Payeras]

Right! everything is working fine now.

Thank you Erel