Android Question Polyline in Google Map Api v2

Facilauto Juan · Nov 27, 2013

Hello there!

I can see the map in my app.
I can see the marker with the "Hello!!!"
But... I can't see the polyline.

What could be happening?

Thanks in advance for your responses.

B4X:

Sub Map_Ready
  Log("map ready")
  gmap = mFragment.GetMap
  If gmap.IsInitialized = False Then
      ToastMessageShow("Error initializing map.", True)
  Else
      gmap.AddMarker(36, 15, "Hello!!!")
      Dim line As Polyline
      Dim points As List
      Dim point As LatLng 
      Dim color() As Int
      linea=gmap.AddPolyline
      points.Initialize
     
      'color=
      line.color=Array As Int(255,255,255)
      line.Geodesic=True
      line.Visible =True
      line.Width=2
      'line.ZIndex=0
      point.Initialize(37.772323, -122.214897)
      points.Add(point)
      point.Initialize(21.291982, -157.821856)
      points.Add(point)
      point.Initialize(-18.142599, 178.431)
      points.Add(point)
      point.Initialize(-27.46758, 153.027892)
      points.Add(point)
      line.Points=points
      Dim cp As CameraPosition
      cp.Initialize(36, 15, gmap.CameraPosition.Zoom)
      gmap.AnimateCamera(cp)
  End If
End Sub

Erel · Nov 27, 2013

I'm not sure whether this is the issue, however you should redim the point before it is reused:

B4X:

point.Initialize(37.772323, -122.214897)
points.Add(point)

Dim point As LatLnt
point.Initialize(21.291982, -157.821856)

...

marcick · Nov 27, 2013

I get an error with "line.color=ArrayAsInt(255,255,255)"
Try for example with "Pline.Color=Colors.blue"

Facilauto Juan · Nov 28, 2013

that's it! Thanks!

omidaghakhani1368 · Feb 21, 2015

Hi
I cannot create line.
I use above code to draw line but not draw anything?

eurojam · Feb 21, 2015

The line goes from California - Hawaii (Aloa...) to fitschi island and ends in Australia, whereas the camera of the maps goes to Malta (Mediterranean Sea). So there will be no line visible. Try to zoom to Hawaii (Aloa...) ...

Cheers
stefan

omidaghakhani1368 · Feb 21, 2015

eurojam said:
The line goes from California - Hawaii (Aloa...) to fitschi island and ends in Australia, whereas the camera of the maps goes to Malta (Mediterranean Sea). So there will be no line visible. Try to zoom to Hawaii (Aloa...) ...

Cheers
stefan

I zoom but not have any line.event i set width 10 but not draw

eurojam · Feb 21, 2015

okay, then this wasn't the problem, but at the moment no other idea...

eurojam · Feb 21, 2015

I have tried the example, no problem. The line goes from California via Hawaii (Aloa...) to Australia (I have changed the color from white to red)...

B4X:

Sub Globals
    Dim MapFragment1 As MapFragment
    Dim GoogleMap1 As GoogleMap
    Dim MapPanel As Panel
    'Dim GroundOverlay1 As GroundOverlay
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Main")
    If MapFragment1.IsGooglePlayServicesAvailable = False Then
        ToastMessageShow("Google Play services not available.", True)
    Else
        MapFragment1.Initialize("MapFragment1", MapPanel)
    End If
End Sub

Sub MapFragment1_Ready
    Log("MapFragment1_Ready")
    Log(MapFragment1.GetOpenSourceLicenseInfo)

    GoogleMap1 = MapFragment1.GetMap
    If GoogleMap1.IsInitialized = False Then
        ToastMessageShow("Error initializing map.", True)
    Else

      GoogleMap1.AddMarker(36, 15, "Hello!!!")
      Dim line As Polyline
      Dim points As List
      Dim Point As LatLng
      line=GoogleMap1.AddPolyline
      points.Initialize
    
      'color=
      line.color=Colors.Red 'Array As Int(255,255,255)
      line.Geodesic=True
      line.Visible =True
      line.Width=2
      'line.ZIndex=0
      Point.Initialize(37.772323, -122.214897)
      points.Add(Point)
      Point.Initialize(21.291982, -157.821856)
      points.Add(Point)
      Point.Initialize(-18.142599, 178.431)
      points.Add(Point)
      Point.Initialize(-27.46758, 153.027892)
      points.Add(Point)
      line.points=points
      Dim cp As CameraPosition
      cp.Initialize(36, 15, GoogleMap1.CameraPosition.Zoom)
      GoogleMap1.AnimateCamera(cp)
    End If
End Sub

ihabsharaf · Mar 7, 2015

hi
what about road directions

eurojam · Mar 7, 2015

ihabsharaf said:
what about road directions

What do you mean by road directions? If you want to build a navigation app you can use Google directions api or mapquest for example...

arnold steger · Mar 28, 2015

I whant use add polyline for view a saved route. My data come in a second moment from a txt file.
My code not draw the line. Where may be my problem?

B4X:

        Dim PolylineCoords0() As Double=Array As Double(46.803602,11.773665,46.80388,11.773706,46.804077,11.773733,46.804615,11.773817,46.804894,11.773837000000002)
        Dim PolylinePoints0 As List=CoordsToLatLngList0(PolylineCoords0)
        PolylinePoints0.Initialize
       
        Dim Polyline0 As Polyline
        Polyline0=gmap.AddPolyline
        Polyline0.Points=PolylinePoints0
        Polyline0.Width=4
        Polyline0.Color=gmap.HUE_YELLOW
        Polyline0.Geodesic=True
        Polyline0.Visible=True
               
        Dim StartLat,StartLng As Double
        StartLat=PolylineCoords0(0)
        StartLng=PolylineCoords0(1)
       
        Dim cp As CameraPosition
     cp.Initialize(StartLat,StartLng, 15)
     gmap.AnimateCamera(cp)

warwound · Mar 28, 2015

arnold steger said:
Dim PolylinePoints0 As List=CoordsToLatLngList0(PolylineCoords0)
PolylinePoints0.Initialize

You populate your PolylinePoints0 List and then Initialize it.
Initialize clears the List - it now contains no points.

arnold steger · Mar 29, 2015

Thanks, this and the line for color are my problem.
This colore change work fine.

Polyline0.Color=Colors.White

BarryW · Apr 15, 2015

arnold steger said:

I whant use add polyline for view a saved route. My data come in a second moment from a txt file.
My code not draw the line. Where may be my problem?

B4X:

        Dim PolylineCoords0() As Double=Array As Double(46.803602,11.773665,46.80388,11.773706,46.804077,11.773733,46.804615,11.773817,46.804894,11.773837000000002)
        Dim PolylinePoints0 As List=CoordsToLatLngList0(PolylineCoords0)
        PolylinePoints0.Initialize
      
        Dim Polyline0 As Polyline
        Polyline0=gmap.AddPolyline
        Polyline0.Points=PolylinePoints0
        Polyline0.Width=4
        Polyline0.Color=gmap.HUE_YELLOW
        Polyline0.Geodesic=True
        Polyline0.Visible=True
              
        Dim StartLat,StartLng As Double
        StartLat=PolylineCoords0(0)
        StartLng=PolylineCoords0(1)
      
        Dim cp As CameraPosition
     cp.Initialize(StartLat,StartLng, 15)
     gmap.AnimateCamera(cp)

This code only show a straight line... How to get the path of the roads

arnold steger · Apr 15, 2015

The part of read from file currently i have not maked.I must first decide what format is the best for my use. I can post when it run.

arnold steger · May 13, 2015

i have added in my code the part of read from txt. not draw the line.
not finde my problem.

B4X:

        Dim listtemp,listpoints As List
       
        listpoints.Initialize
        listtemp = File.ReadList(File.DirAssets,"route_1.txt")
        For i = 0 To listtemp.Size-1
        Dim Punkte() As String = Regex.Split(",",listtemp.Get(i))
            Dim ln As LatLng
            ln.Initialize(Punkte(0),Punkte(1))
            listpoints.Add(ln)
        Next
       
        Dim Polyline0 As Polyline
        Polyline0=gmap.AddPolyline
        Polyline0.Points.Addall(listpoints)
        Polyline0.Width=4
        Polyline0.Color=Colors.White
        Polyline0.Geodesic=True
        Polyline0.Visible=True

the listpoints fill fine

Erel · May 13, 2015

You must set the Points property:

B4X:

Polyline0.Points = listpoints

When you get the value of this property you are getting a copy of the original list.

Android Question Polyline in Google Map Api v2

Facilauto Juan

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Erel

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marcick

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Facilauto Juan

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omidaghakhani1368

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eurojam

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omidaghakhani1368

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eurojam

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eurojam

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ihabsharaf

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arnold steger

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warwound

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arnold steger

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BarryW

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arnold steger

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