Android Tutorial (old) Google Maps Android v2 tutorial

If you are using B4A v5.80+ then please follow this tutorial: https://www.b4x.com/android/forum/threads/google-maps.63930/#post-404386

GoogleMaps library requires v2.50 or above.

GoogleMaps library allows you to add Google maps to your application. This library requires Android 3+ and will only work on devices with Google Play service.

This tutorial will cover the configuration steps required for showing a map.

1. Download Google Play services - From the IDE choose Run AVD Manager and then choose Tools - SDK Manager. Select Google Play services under the Extras node and install it:

2. Copy google-play-services.jar to the libraries folder - This file is available under:

C:\<android sdk>\extras\google\google_play_services\libproject\google-play-services_lib\libs (ignore the extra space that the forum script insists on adding)

You should copy it to the libraries folder.

2.5. Download the attached library, unzip it and copy to the libraries folder.

3. Find the key signature - Your application must be signed with a private key other than the debug key. After you select a new or existing key file (Tools - Private Sign Key) you should reopen the private key dialog. The signature information will be displayed (increase the dialog size as needed).
The value after SHA1 is required for the next step:

4. Create an API project - Follow these steps and create an API project.
You should follow the steps under "Creating an API Project" and "Obtaining an API key".

Tips:
- Make sure to select "Google Maps Android API v2" in the services list and not one of the other similar services.
- Under "Simple API Access" you should select "Key for Android apps (with certificates".

5. Add the following code to the manifest editor:

AddManifestText( <permission
          android:name="$PACKAGE$.permission.MAPS_RECEIVE"
          android:protectionLevel="signature"/>
      <uses-feature android:glEsVersion="0x00020000" android:required="true"/>)

AddApplicationText(<meta-data
    android:name="com.google.android.maps.v2.API_KEY"
    android:value="AIzaSyCzspmxxxxxxxxxxxxx"/>
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version"
    />)
AddPermission(android.permission.ACCESS_NETWORK_STATE)

You should replace the value after android:value with the key you received in the previous step.

6. Add an #AdditionalRes attribute to the main activity:

You should add a reference to Google play resources by adding the following line:

#AdditionalRes: <google-play-services res folder>, com.google.android.gms

For example:

#AdditionalRes: C:\android-sdk-windows\extras\google\google_play_services\libproject\google-play-services_lib\res, com.google.android.gms

Run the following code:

'Activity module
Sub Process_Globals

End Sub

Sub Globals
   Dim mFragment As MapFragment
   Dim gmap As GoogleMap
   Dim MapPanel As Panel
End Sub

Sub Activity_Create(FirstTime As Boolean)
   MapPanel.Initialize("")
   Activity.AddView(MapPanel, 0, 0, 100%x, 100%y)
   If mFragment.IsGooglePlayServicesAvailable = False Then
      ToastMessageShow("Google Play services not available.", True)
   Else
      mFragment.Initialize("Map", MapPanel)
   End If
End Sub
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 cp As CameraPosition
      cp.Initialize(36, 15, gmap.CameraPosition.Zoom)
      gmap.AnimateCamera(cp)
   End If
End Sub

You should see:

If you see a "white map" then there is most probably a mismatch between the: package name, sign key and the API key (from the manifest editor).

Google documentation: https://developers.google.com/maps/documentation/android/intro
Note that there is a required attribution which you must include in your app (see above link). You can get the string by calling MapFragment.GetOpenSourceSoftwareLicenseInfo.

V1.01: Fixes a bug in AddMarker2.

 

[hypergreatthing]

so i got the map to work. Question:
I'm trying to plot out a lot of markers (around 10,000).
While i can do this, is there some sort of scaling i can add so that they will only be displayed when zoomed in to a certain level?
Thanks,

 

[rboeck]

You can use the event CameraChange from your MapFragment variable: As parameter you get CameraPosition, which show you the position of the camera and also your zoom level. I have a database with more than 5000 points and i want to try, if i should add the points at one time at the beginning or only for the current view...
I think, we should post our experience for this in the next days.
Greetings
Reinhard

 

[hypergreatthing]

You can use the event CameraChange from your MapFragment variable: As parameter you get CameraPosition, which show you the position of the camera and also your zoom level. I have a database with more than 5000 points and i want to try, if i should add the points at one time at the beginning or only for the current view...
I think, we should post our experience for this in the next days.
Greetings
Reinhard

I'm thinking of a service to populate it, then a camera event to display the markers or not. I was trying to think of some way to only turn on the markers in a given area, but i don't think there's any functionality to do that.... Even forcing all the markers plotted to visible=false or true is sort of eluding me at the moment. I tried to populate all my markers on a activity and it was timing out. The tablet can run with 12k markers displaying at once, but zoomed out it runs at a crawl. Zoomed in it seems to display them fine, so i don't think it's a memory issue, it's just a drawing issue.
Also, when you rotate the screen it redraws all the plots, not what i want to happen. I'll have to figure out why it's doing that and read up what gets triggered on a rotate.

 

[rboeck]

Hi,

i want to report, how i it worked for me now: i have made it with an map_click event, when the user is interested, he clicks on the map and my app reads all locations from a database in an circle of 40 km. I think, its doable for the user, he can himself choose, where he want to see the labels.
But: My system is useable, as long as the user doesnt change the zoom level very much. The second problem is, if the screen is full of markers, how to reset or remove them all in one action.
Greetings
Reinhard

 

[hypergreatthing]

Nevermind, the function addmarker returns marker, so i can add them and then modify their visibility and add them to a list.

 

[warwound]

GoogleMapsExtras version 1.20 adds support for the InfoWindowAdapter enabling you to customise the appearance of the info window.

The InfoWindowAdapter raises GetInfoContents and GetInfoWindow events, your event handling Sub must return a View or Null to the library.
GetInfoContents allows you to use the default info window but replace the info window content with your own View.
GetInfoWindow allows you to completely replace the default info window with your own View.
If either of these Subs return Null then the default content or info window will be used.

First an example that shows using the GetInfoContents event:

Sub Process_Globals

End Sub

Sub Globals
   Dim InfoWindowLabel As Label
    Dim MapFragment1 As MapFragment
   Dim Markers As Map
    Dim GoogleMap1 As GoogleMap
    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
      Dim GoogleMapsExtras1 As GoogleMapsExtras
      Dim InfoWindowAdapter1 As InfoWindowAdapter
      
      InfoWindowAdapter1.Initialize("InfoWindowAdapter1")
      GoogleMapsExtras1.SetInfoWindowAdapter(GoogleMap1, InfoWindowAdapter1)
      
      InfoWindowLabel.Initialize("")
      InfoWindowLabel.Color=Colors.Red
      InfoWindowLabel.TextColor=Colors.White
      Markers.Initialize
      
      Dim Marker1 As Marker
        Marker1=GoogleMap1.AddMarker(52.75619, 0.3980, "Home Sweet Home")
      Marker1.Snippet="Home is where the heart is!"
      Markers.Put(Marker1, Marker1)
      
      Dim Marker1 As Marker
        Marker1=GoogleMap1.AddMarker(52.93514, 0.4829, "Hunstanton")
      Marker1.Snippet="A charming seaside town. Popular with the tourists."
      Markers.Put(Marker1, Marker1)
      
        Dim CameraPosition1 As CameraPosition
        CameraPosition1.Initialize(52.75619, 0.3980, 8)
        GoogleMap1.AnimateCamera(CameraPosition1)
    End If
End Sub

Sub InfoWindowAdapter1_GetInfoContents(Marker1 As Marker) As View
   '   the default InfoContent will be used if this event Sub is not defined or if it returns Null
   Log("InfoWindowAdapter1_GetInfoContents")
   
   '   re-using the InfoWindowLabel works in GetInfoContents
   
   InfoWindowLabel.Text=Marker1.Title&CRLF&Marker1.Snippet
   Return InfoWindowLabel
End Sub

I add a couple of markers to the map and a click on a marker shows the default info window with a rather unimpressive red Label containing the text that is the marker title and description.

Note that this Label is declared once in Globals and re-used each time the library requests a View for the info window content.

This next example shows how to use the GetInfoWindow event to completely replace the default info window with your own View.

Sub Process_Globals

End Sub

Sub Globals
    Dim MapFragment1 As MapFragment
   Dim Markers As Map
    Dim GoogleMap1 As GoogleMap
    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
      Dim GoogleMapsExtras1 As GoogleMapsExtras
      Dim InfoWindowAdapter1 As InfoWindowAdapter
      
      InfoWindowAdapter1.Initialize("InfoWindowAdapter1")
      GoogleMapsExtras1.SetInfoWindowAdapter(GoogleMap1, InfoWindowAdapter1)
      
      Markers.Initialize
      
      Dim Marker1 As Marker
        Marker1=GoogleMap1.AddMarker(52.75619, 0.3980, "Home Sweet Home")
      Marker1.Snippet="Home is where the heart is!"
      Markers.Put(Marker1, Marker1)
      
      Dim Marker1 As Marker
        Marker1=GoogleMap1.AddMarker(52.93514, 0.4829, "Hunstanton")
      Marker1.Snippet="A charming seaside town. Popular with the tourists."
      Markers.Put(Marker1, Marker1)
      
        Dim CameraPosition1 As CameraPosition
        CameraPosition1.Initialize(52.75619, 0.3980, 8)
        GoogleMap1.AnimateCamera(CameraPosition1)
    End If
End Sub

Sub InfoWindowAdapter1_GetInfoWindow(Marker1 As Marker) As View
   '   the default InfoWindow will be used if this event Sub is not defined or if it returns Null
   Log("InfoWindowAdapter1_GetInfoWindow")
   
   Dim InfoWindowLabel As Label
   InfoWindowLabel.Initialize("")
   InfoWindowLabel.Color=Colors.Red
   InfoWindowLabel.TextColor=Colors.White
   
   InfoWindowLabel.Text=Marker1.Title&CRLF&Marker1.Snippet
   Return InfoWindowLabel
End Sub

A click on a marker now shows just the red Label as in the previous example - no info window.

If you try to re-use a View for the info window it will work the first time GetInfoWindow is called, after that your activity will crash - You cannot re-use a View with GetInfoWindow, you must create a new View each time it is called.

Neither of these examples are visually inspiring!
You will need to get creative yourself if you want to improve on the default info window and it's content.
You're not limited to using a Label for these Views, any View can in theory be used.

Both examples are attached.

Martin.

 

[hypergreatthing]

So question:
is VisibleRegion implemented?
Thanks,

 

[warwound]

So question:
is VisibleRegion implemented?
Thanks,

Not yet!
I've implemented the Projection and VisibleRegion objects and updated GoogleMapsExtras with a GetProjection method:

Projection
Methods:

• FromScreenLocation (Point1 As Point) As LatLngWrapper
  Returns the geographic location that corresponds to a screen location.
  This method is of no real use until Point object is wrapped and can be passed as a parameter.
• GetVisibleRegion As VisibleRegion
  Gets a projection of the viewing frustum for converting between screen coordinates and geo-latitude/longitude coordinates.
• IsInitialized As Boolean
• ToScreenLocation (LatLng1 As LatLng) As Point
  Returns a screen location that corresponds to a geographical coordinate.
  This method is of no real use until Point object is wrapped and the method updated to return a wrapped Object.

VisibleRegion
Methods:

• Initialize (NearLeft As LatLng, NearRight As LatLng, FarLeft As LatLng, FarRight As LatLng, LatLngBounds1 As LatLngBounds)
  Creates a new VisibleRegion given the four corners of the camera.
• IsInitialized As Boolean

Properties:

• FarLeft As LatLngWrapper [read only]
• FarRight As LatLngWrapper [read only]
• LatLngBounds As LatLngBounds [read only]
• NearLeft As LatLngWrapper [read only]
• NearRight As LatLngWrapper [read only]

GetProjection (GoogleMap1 As GoogleMap) As Projection
Returns a Projection object that you can use to convert between screen coordinates and latitude/longitude coordinates.

So you can create a VisibleRegion and also get one from the Projection object.
But what use is a Visible Region?
Is it used to set the map camera position? I can't find any documentation or examples that actually shows it in use.

If you can give me an idea of what you want to use VisibleRegion for i'll complete this update.

Martin.

 

[hypergreatthing]

I have over 10k markers on my gmap. Displaying them all zoomed out is not appropriate. There is no scaling built into markers that says something like, only display when zoomed in at greater than zoom 13 so i'm building my own scaling.
The idea is to populate two maps (the container called map like a list, not a gmap) with the markers that i'm displaying and setting the marker.visible=false when initalizing. Then when the user zooms into zoom>12 or 13, use the visibleregion boundaries and do a query to my database of points, sets only those inside the visibleregion to visible=true.
I said i'm using two maps. One map contains all the list of all my markers where the key is a unique key in the database that contains my points. The second map is a list of all markers that are currently plotted. I use that to keep track of which ones are turned on so i can iterate through that list when i need to turn off visibility outside the current camera bounds.
This is all processed by a service so when initializing or drawing the markers, it doesn't lock up the app/activity.
I don't think the number of markers in memory decreases performance, but when zooming with anything like 1000+ markers displayed all at once, the gmap seems to redraw each one individually, making performance really slow.
I would love to have some sort of built in function that says only display when camera zoom > X for each marker, but that doesn't look like a function of google maps for android api. I think it is for google maps v3 api.

 

[warwound]

It's a real shame that Google made so many of the classes in the new Android v2 library final - they cannot then be extended to enhance functionality.
That more or less means that you have the built in Android v2 map objects and that's that - not like the original Android v1 library where you were free to extend the base objects and add the functionality you required.

Anyway - mini rant over!

So you want to get the map bounds and be able to work out which markers in your database are within the visble map bounds?

You should be able to do that with the update as it is:

Sub Process_Globals
End Sub

Sub Globals
    Dim MapFragment1 As MapFragment
    Dim GoogleMap1 As GoogleMap
   Dim GoogleMapsExtras1 As GoogleMapsExtras
    Dim MapPanel As Panel
   Dim Projection1 As Projection
   Dim VisibleRegion1 As VisibleRegion
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(52.75619, 0.3980, 8)
        GoogleMap1.AnimateCamera(CameraPosition1)
    End If
End Sub

Sub MapFragment1_CameraChange (Position As CameraPosition)
   Log("MapFragment1_CameraChange")
   Projection1=GoogleMapsExtras1.GetProjection(GoogleMap1)
   VisibleRegion1=Projection1.GetVisibleRegion
   Log(VisibleRegion1.LatLngBounds)
End Sub

Remember that a LatLngBounds object has a Contains method which should be useful to work out which LatLng objects are within the LatLngBounds.

Example code and (beta) library update attached.
Can you post again with your results? Confirm everything works as expected and i'll get the library update uploaded to it's main thread.

Martin.

 

[hypergreatthing]

This works great. Thank you so much. The VisibleRegion is working as intended, i'm able to change the visibility of the markers within the region to on when the camera is pointing at the location. Since i'm dealing with a subset of my 10k+ markers, performance is good. My map solution is working well, my plottedmarkers map is setting visibility of the markers to false when they're outside of the VisibleRegion. I might create a generic class for this and add it to this thread at a later time.
hmm, something minor but i noticed that when i'm calling addmarker, even though i'm immediately setting it to visible=false, it flashes on the screen. Any way to create a addmarker function that takes value of marker so i can initialize it before i add it to the map?
Also off topic, but since i'm adding a lot of markers to the map, is there a way to tell the OS that during pause and resume to not clear out the variables? Should i put them in a service that's sticky or whatnot? Rotations take a while, i'm trying to figure out a way where it's a lot faster.
Thanks,

 

[warwound]

The way that Erel created the b4a GoogleMaps library did not expose the MarkerOptions object and this is the object you'd need to use to create a Marker that is initially not visible.

So i've now partly wrapped the MarkerOptions object and added a new method to GoogleMapsExtras AddMarker(MarkerOptions1 As MarkerOptions) As Marker.

Have a look at this example code:

Sub Process_Globals

End Sub

Sub Globals
    Dim MapFragment1 As MapFragment
    Dim GoogleMap1 As GoogleMap
   Dim GoogleMapsExtras1 As GoogleMapsExtras
    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
      '   use the new MarkerOptions method to create and add a Marker to the map
      
      Dim MarkerOptions1 As MarkerOptions
      MarkerOptions1.Initialize
      
      MarkerOptions1.Position2(52.75619, 0.3980).Snippet("Home is where the heart is").Title("Home Sweet Home").Visible(True)
      Dim Marker1 As Marker=GoogleMapsExtras1.AddMarker(GoogleMap1, MarkerOptions1)
      
        Dim CameraPosition1 As CameraPosition
        CameraPosition1.Initialize(52.75619, 0.3980, 6)
        GoogleMap1.AnimateCamera(CameraPosition1)
    End If
End Sub

MarkerOptions
Methods:

• Anchor (U As Float, V As Float) As MarkerOptions
• Draggable (Draggable As Boolean) As MarkerOptions
• Initialize
• IsInitialized As Boolean
• Position (LatLng1 As LatLng) As MarkerOptions
• Position2 (Latitude As Double, Longitude As Double) As MarkerOptions
• Snippet (Snippet As String) As MarkerOptions
• Title (Title As String) As MarkerOptions
• Visible (Visible As Boolean) As MarkerOptions

I've not fully wrapped the MarkerOptions object, there are various other methods that can also be wrapped, take a look: https://developers.google.com/maps/...m/google/android/gms/maps/model/MarkerOptions.

Code and beta library files attached - i'll complete the MarkerOptions object hopefully tomorrow and get it uploaded to the GoogleMapsExtras thread.

When the device orientation changes you have no way to tell the activity not to destroy all of it's objects and variables - that's the way android works.

You could keep references as process global objects - not sure about a sticky service but i guess that's another way to keep a reference to objects you create but don't want destroyed when the orientation changes.

Note that you should not keep a reference to a Marker - a Marker is an Activity object and should be destroyed when the activity is destroyed.
Don't try to keep a process global reference to a Marker - there's no point, you can't add a Marker to the map, BUT you can keep a process global reference to a MarkerOptions object.

So create a MarkerOptions object for each of your many markers, and keep each MarkerOptions object as a process global (or try and use a service), then on orientation change you can re-create new Markers from the (already created) MarkerOptions objects.

Martin.

 

[hypergreatthing]

hmmm.... well if there's no way to tell the OS to make a variable persistent, then maybe instead of trying to manage everything in memory with the visible flag, it might be easier to just create the markers as needed and get rid of them once they're off screen. It's just that red flags in my own head get thrown up when i'm creating, deleting, then possibly recreating the same object over and over. I'm not quite sure how good garbage collection is and i don't want my app to look like it has a memory leak, hence trying to create everything once in memory and managing it using the visible flag.
And thanks warwound, your help has been invaluable and much appreciated.

 

[electronik54]

:sign0085: :sign0104:
hi....
i am using GMaps to display few location. locations are selected fro listview and a layout is called which displays the location on the map.
The problem is it only works for the first location for second and so on locations the map would freeze at latitude = longitude = 0.00. zoom function wont work too.
is there anything so that i can reset the map?

 

[warwound]

The Google Maps Android API v2 library was updated Feb 2013:

https://developers.google.com/maps/documentation/android/releases#february_2013

Many bug fixes and a few new classes.
Among the updates you will see:

Improved recovery from gaining network connectivity. This fix requires the ACCESS_NETWORK_STATE permission.

The B4A GoogleMaps library ought to be updated and this permission added i think?

Martin.

 

[warwound]

The tablet can run with 12k markers displaying at once, but zoomed out it runs at a crawl.

Take a look at the Feb 2013 update from Google: https://developers.google.com/maps/documentation/android/releases#february_2013.

Greatly improved performance of adding many markers.

It may be worthwhile for you to update your SDK to the latest version.
After updating your SDK be sure that you also copy the new (updated) google-play-services.jar from your SDK folder to your b4a additional libraries folder, overwriting the old version.

Martin.

 

[warwound]

GoogleMapsExtras version 1.31 adds support for the new Circle and CircleOptions classes.

Here's a simple example:

Sub Process_Globals

End Sub

Sub Globals
    Dim MapFragment1 As MapFragment
    Dim GoogleMap1 As GoogleMap
   Dim GoogleMapsExtras1 As GoogleMapsExtras
    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
      Dim CircleOptions1 As CircleOptions
      CircleOptions1.Initialize
      
      CircleOptions1.Center2(52.75619, 0.3980).FillColor(Colors.ARGB(128, 192, 0, 0)).Radius(500).StrokeColor(Colors.Black).StrokeWidth(2)
      
      Dim Circle1 As Circle=GoogleMapsExtras1.AddCircle(GoogleMap1, CircleOptions1)
      
        Dim CameraPosition1 As CameraPosition
        CameraPosition1.Initialize(52.75619, 0.3980, 14)
        GoogleMap1.AnimateCamera(CameraPosition1)
    End If
End Sub

Martin.

 

[grguido]

mapFragment: missing library reference

Sorry for my maybe stupid question and for my poor English, but I don't understand what to do at step 2.5 of this tutorial. I installed Google Play Service, I recived api key from google api console, I update the manifest and so on for all other steps, but when I run the exemple in the tutorial I recive this error:"Error description: Unknown type: mapfragment". Missing reference to library. How can I reference this library? Can anyone help me?

 

[Erel]

Have you checked GoogleMaps in the libraries tab (right side of the IDE)?

 

[cthomas4579]

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