Android Tutorial (old) Google Maps Android v2 tutorial

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cthomas4579

Member
Licensed User
Have you checked GoogleMaps in the libraries tab (right side of the IDE)?
Having the same problem with this.. It doesn't appear in the right side under referenced libraries. Perform a refresh and still nothing.. Restart the IDE still nothing.

Any ideas?

Google-play-services.jar is copied to the libraries folder of b4 and paths are set
 

warwound

Expert
Licensed User
Hi Erel
Can I determine the screen coordinates of Marker object?
GoogleMapsExtras allows you to use the Projection object.

You can get a LatLng from a screen coordinate and vice versa with it's FromScreenLocation and ToScreenLocation methods.

Unfortunately both these methods require a Point object and i think b4a has no native support for the Point object.

This is where i sometimes wonder if it'd be handy to have a database or even just a plain list of all Android classes that have currently been wrapped and can therefore be used in b4a - it'd save me wrapping a class that has already been wrapped in another library.

Anyway, i'll update GoogleMapsExtras a bit later so that you can use it's FromScreenLocation and ToScreenLocation methods.

Martin.
 

warwound

Expert
Licensed User
:sign0161:

What am i saying - i've already added a Point wrapper to the GoogleMapsExtras library!

Must be time for a rest.

So you can in fact create a LatLng and then use the Projection method ToScreenLocation to get a Point which represents the current screen position of that LatLng.

Martin.
 

denik

Member
Licensed User
Hi, Martin
When I add GoogleMapsExtras library (even in empty project) and insert the only string
Dim p As Point
it is
java.lang.RuntimeException: Object should first be initialized (Point).
 

warwound

Expert
Licensed User
I've now fixed the bug where Point could not be initialized, get the updated version of GoogleMapsExtras from here: http://www.basic4ppc.com/forum/addi...pdates/26277-googlemapsextras.html#post152004.

And here's an example that logs the screen coordinates each time the map position changes:

B4X:
Sub Process_Globals

End Sub

Sub Globals
    Dim GoogleMap1 As GoogleMap
   Dim GoogleMapsExtras1 As GoogleMapsExtras
    Dim MapFragment1 As MapFragment
    Dim MapPanel As Panel
   Dim Projection1 As Projection
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")
    GoogleMap1 = MapFragment1.GetMap
    If GoogleMap1.IsInitialized = False Then
        ToastMessageShow("Error initializing map.", True)
    Else
        Dim CameraPosition1 As CameraPosition
        CameraPosition1.Initialize(52, 0.75, 6)
        GoogleMap1.AnimateCamera(CameraPosition1)
    End If
End Sub

Sub MapFragment1_CameraChange (Position As CameraPosition)
   Projection1=GoogleMapsExtras1.GetProjection(GoogleMap1)
   
   Dim Point1 As Point
   Point1=Projection1.ToScreenLocation(Position.Target)
   
   Log("LatLng1: "&Position.Target)
   Log("Point1: "&Point1)
   
End Sub
On my Novo ElfII tablet that always logs (512, 246), the documentation states:

Returns a screen location that corresponds to a geographical coordinate (LatLng). The screen location is in screen pixels (not display pixels) relative to the top left of the map (not of the whole screen).
So i'm not sure how to use these coordinates, i'll have to leave you to experiment.

Martin.
 

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Bart Kerver

New Member
Licensed User
Android 2 and google maps

HI,

I'm aware of "this library requires Android 3+" and it works fine on my tablet, but was wondering how the Google Maps (the app) on a Android 2 (gingerbread - Samsung galaxy2) seems to be working fine.

Is this a B4A library issue or does Google Maps (the app) work a different way on Android 2x?

Kind regards,
Bart
 

desof

Well-Known Member
Licensed User
followed to the letter and I get this error I am doing wrong?

followed to the letter and I get this error I am doing wrong?


Parsing code. 0.00
Compiling code. 0.20
Compiling layouts code. 0.02
Generating R file. 0.45
Compiling generated Java code. Error
B4A line: 44
gmap.AnimateCamera(cp)
javac 1.7.0_17
src\b4a\example\main.java:338: error: package com.google.android.gms.maps.model does not exist
mostCurrent._gmap.AnimateCamera((com.google.android.gms.maps.model.CameraPosition)(_cp.getObject()));
^
1 error
 

tpakis

Active Member
Licensed User
This library wraps MapFragment which is only supported by Android 3+. There is another API named SupportMapFragment that is based on a "support library" for backwards compatibility (as Fragments were not supported in Android 2).

There are some known issues with SupportMapFragment.
Erel is it very difficult to make a second library that wraps SupportMapFragment? I have seen google maps v2 running on 2.2 devices. Nearly 60% of my app users according to store still use 2.2-2.3
 

AlteregoHR

Member
Licensed User
Hello to all,
This is my first post :)
I just bought B4a and I am trying Google maps api. I went through all the steps successfully except adding lines to manifest editor.
I copied the lines that go to the manifest and added key from google.
Now, when compiling I get:
Failure [INSTALL_PARSE_FAILED_MANIFEST_MALFORMED] :sign0085:

Edit: The answer was in another Thread : Package name with non-lowercase letter
 
Last edited:

tpakis

Active Member
Licensed User
If you like I can upload the code and you can try to modify it as needed (I actually think that the code should be already available in this thread somewhere).
You mean the java code for the library? Yes why not (didn't find it in the thread).
 

warwound

Expert
Licensed User
How i can get the event when i clic on the InfoWindow (not directly the marker) ?
I have updated GoogleMapsExtras adding support for the OnInfoWindowClickListener.

Here's some example code:

B4X:
Sub Process_Globals

End Sub

Sub Globals
    Dim GoogleMap1 As GoogleMap
   Dim Label1 As Label
    Dim MapFragment1 As MapFragment
    Dim MapPanel As Panel
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")
    GoogleMap1 = MapFragment1.GetMap
    If GoogleMap1.IsInitialized = False Then
        ToastMessageShow("Error initializing map.", True)
    Else
      GoogleMap1.MapType=GoogleMap1.MAP_TYPE_NORMAL
      
      Dim Coords() As Double=Array As Double(52.7667, 0.3931, 52.7480, 0.3918, 52.7550, 0.4026, 52.7667, 0.3931)
      Dim i As Int
      For i=0 To Coords.Length-2 Step 2
         Dim Marker1 As Marker
         Marker1=GoogleMap1.AddMarker(Coords(i), Coords(i+1), "Marker #"&(i/2))
         Marker1.Draggable=True
      Next
      
      Dim GoogleMapsExtras1 As GoogleMapsExtras
      
      Dim OnInfoWindowClickListener1 As OnInfoWindowClickListener
      OnInfoWindowClickListener1.Initialize("OnInfoWindowClickListener1")
      
      If OnInfoWindowClickListener1.IsInitialized Then
         GoogleMapsExtras1.SetOnInfoWindowClickListener(GoogleMap1, OnInfoWindowClickListener1)
      Else
         Log("OnInfoWindowClickListener1 is not initialized - check that the Activity contains a Click callback Sub")
      End If
      
        Dim CameraPosition1 As CameraPosition
        CameraPosition1.Initialize(52.75811, 0.3912, 13)
        GoogleMap1.AnimateCamera(CameraPosition1)
    End If
End Sub

Sub OnInfoWindowClickListener1_Click(Marker1 As Marker)
   Log("OnInfoWindowClickListener1_Click")
   Label1.Text=Marker1.Title&" : "&Marker1.Position
End Sub
3 Markers are added to the map, a click on a Marker shows an infowindow and a click on an infowindow causes the OnInfoWindowClickListener1_Click Sub to be called and a Label displays the position and title of the Marker that the infowindow was opened on.

Martin.
 

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