Android Question Load GMAP Initialize issue

AndroidMadhu · Nov 16, 2020

Hello,
I am loading GMAP, and It is loading at (0,0) position. then it is coming as per the GPS current location.
But I want to initialize/load the MAP[When the Application start] with the current location of the user.

Below is the code I have used at Tracker Module...

B4X:

  Public Sub Track
If Tracking Then Return
If Starter.rp.Check(Starter.rp.PERMISSION_ACCESS_FINE_LOCATION) = False Then
Log("No permission")
Return
End If
GPS.Start(xx.5726, yy.3639)  'Hardcoded user current location==> Not working
Tracking = True
End Sub

Please advice

Thanks

DonManfred · Nov 16, 2020

track of GPS is not related to the users Position with GoogleMaps.

Load the layout, request the permission for user PERMISSION_ACCESS_FINE_LOCATION, enable MyLocationEnabled in googlemaps only if you have permission.

See GoogleMaps Tutorial; it is using the MyLocationEnabled in the Example.

Google Maps

Installation instructions: - Register your app in Google developer console: https://console.developers.google.com You need to enable Google Maps Android API. Then click on Credentials -> Create Credentials -> API Key -> Android Key. You should get a key that looks like...

www.b4x.com

B4X:

Sub Activity_Create(FirstTime As Boolean)
   Activity.LoadLayout("1")
   Wait For MapFragment1_Ready
   gmap = MapFragment1.GetMap
   rp.CheckAndRequest(rp.PERMISSION_ACCESS_FINE_LOCATION)
   Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
   If Result Then
       gmap.MyLocationEnabled = True
   Else
       Log("No permission!")
   End If
End Sub

AndroidMadhu · Nov 16, 2020

@DonManfred ...
I have used the below code as advised at Activity_create... But no luck.... First the activity is loading with (0,0) lat long and then the map moving to the expected location.

Is that possible to load the map with user's lat/long when open the Application.

B4X:

Wait For MapFragment1_Ready
gmap = MapFragment1.GetMap
rp.CheckAndRequest(rp.PERMISSION_ACCESS_FINE_LOCATION)
Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
If Result Then

Log(Tracker.gpslat)
Log(Tracker.gpslong)

gmap.MyLocationEnabled = True
'gmap.MyLocation.Initialize(Tracker.gpslat,Tracker.gpslong)

Do While gmap.MyLocation.IsInitialized = False
Log("Location not initialized... Sleep a while...")
Sleep(250)
Log("Initialized---")
Loop

If gmap.MyLocation.IsInitialized Then
Dim CameraPosition1 As CameraPosition
CameraPosition1.Initialize(gmap.MyLocation.Latitude,gmap.MyLocation.Longitude, 17)
gmap.moveCamera(CameraPosition1)
End If
Dim strLoc As String
strLoc=gmap.MyLocation.Latitude & "/" & gmap.MyLocation.Longitude
Log(strLoc)

lastLocation.Initialize()
Else
Log("No permission!")
End If

Please advice

DonManfred · Nov 16, 2020

AndroidMadhu said:
Please advice

Upload your project

AndroidMadhu · Nov 18, 2020

@DonManfred ... Please find the attached small project for your reference...

Thanks

AndroidMadhu · Nov 20, 2020

Could you please advice on this? I am stuck and not able to fix the same.

Thanks

Erel · Nov 22, 2020

How do you know the user location before the GPS has a fix?
You can set the map camera position.

And with a custom location provider: https://www.b4x.com/android/forum/threads/google-maps-with-fusedlocationprovider.83876/#content

Android Question Load GMAP Initialize issue

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