Android Tutorial (old) Google Maps Android v2 tutorial

Erel · Dec 18, 2012

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:

B4X:

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:

B4X:

#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:

B4X:

'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.

achtrade · Feb 24, 2015

Erel said:
Not in this library. Check: GoogleMapsExtras

Done !. Thanks.

achtrade · Feb 24, 2015

Erel said:
You just need to implement the sub:

B4X:

Sub Map_MarkerClick (SelectedMarker As Marker) As Boolean Log(SelectedMarker.Title) Return True End Sub

Why the infowindows is no longer available after I added this sub ?

Erel · Feb 25, 2015

Return false if you want the window to show.

arnold steger · Feb 28, 2015

How can convert from edittext to 2 separatly Double?
for example i have the text "46.810487,11.816784" in edittext.
I whant added a marker in my map at this position.

gmap.AddMarker2(Text.Latitude,Text.Longitude, "Position",gmap.HUE_RED)

eurojam · Feb 28, 2015

you can use the stringfunctions Lib, something like this:

B4X:

Dim l As List
Dim sf As StringFunctions
sf.Initialize
l = sf.Split(mystring,",")
gmap.AddMarker2(l.get(0),(l.get(1), "Position",gmap.HUE_RED)

not tested but it should work like this
cheers
stefan

arnold steger · Feb 28, 2015

Thank eurojam for your help.

B4X:

Dim l As List
Dim l1,l2 As String
Dim sf As StringFunctions
sf.Initialize
l = sf.Split(SuchenEditText.Text,",")
l1=l.Get(0)
l2=l.Get(1)
gmap.AddMarker2(l1,l2, "Position",gmap.HUE_RED)

This code is work

shaxboz · Mar 6, 2015

Erel said:
Try the attached APK. Does it work on your device?

Hi Erel!
Your apk is not working on my device.
Android 2.3
"The application B4A Example (process b4a.maps.example) has stopped Unexpectedly "
What should I do?

warwound · Mar 6, 2015

shaxboz said:
Hi Erel!
Your apk is not working on my device.
Android 2.3
"The application B4A Example (process b4a.maps.example) has stopped Unexpectedly "
What should I do?

Erel said:
This library requires Android 3+ and will only work on devices with Google Play service.

marcel · Mar 9, 2015

When you click on a marker you will get a MarkerClick event and you can open the info window. Is their also an event when you click on this info window?

Erel · Mar 9, 2015

No. You can see the available events here: https://www.b4x.com/android/help/googlemaps.html#mapfragment

marcel · Mar 9, 2015

Is this a limitation of the lib or is this not possible in Android?

warwound · Mar 9, 2015

marcel said:
When you click on a marker you will get a MarkerClick event and you can open the info window. Is their also an event when you click on this info window?

GoogleMapsExtras has an OnInfoWindowClickListener.

https://www.b4x.com/android/forum/threads/googlemapsextras.26277/

FranckB · Mar 14, 2015

Hi to All,

I have follow all off the steps to use Google Maps ( with GoogleMapsExtras as an extra lib ) in my app and all is running ok on a real device running 4.1.1 version.
( map is ok , marker is ok , ... )
But the map is blank on a device with 4.4.2 version of Android ?
Is there anything more to declare in the Manifest or anything else to do ( bad version of a lib , ) ?

Here is the manifest :

B4X:

'This code will be applied to the manifest file during compilation.
'You do not need to modify it in most cases.
'See this link for for more information: http://www.b4x.com/forum/showthread.php?p=78136
AddManifestText(
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="14"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
SetApplicationAttribute(android:theme, "@android:style/Theme.Holo")
'End of default text.
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="AIzaSyCJD-[my personnal key masked]"/>
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version"
    />)
AddPermission(android.permission.ACCESS_NETWORK_STATE)
AddPermission(android.permission.CALL_PHONE)

Thank's by advance

Erel · Mar 15, 2015

Try the APK file I posted here: https://www.b4x.com/android/forum/threads/white-map-with-google-maps-v2.48309/#post-300524

Also try to update Google Play Services on the device.

FranckB · Mar 15, 2015

Hi Erel,

Thank's for your response.
Your APK is working on the 2 devices.
I have update the Google play services on the device but allready a blank map.
I have try to change the private key by a new one and i made the api key in the console.
Same problem with this new certificate...

Don't know how to do...

Croïd · Mar 15, 2015

B4X:

<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="14"/>

What did you write in your manifest , now ?

Are you sure for number key SHA , when you create API key ?

FranckB · Mar 15, 2015

Hi Croïd

Yes I'm sure of the SHA key: the map work on another device ( same app version deployed on 2 devices : 1 work, the second one no)

Join a example project that working on a device and not on the other one
( Google play services is install on the 2 ones )

Croïd · Mar 16, 2015

FranckB

I think your problem is the key ! (blank map also)

you did well add SHA-1 xxxxxx ; com.trapit.claysbook , before generate ?

Or Link https://www.b4x.com/android/forum/threads/white-map-with-google-maps-v2.48309/#post-300524

FranckB · Mar 17, 2015

Hi Croïd,

You're right !
I have deleted and generate a new private key ( SHA-1 xxxx ) nd did all the procedure in the developper console of Google to have the correspondant API Key.
After reinstalling the app on the device... It's work !!!

Thank's a lot for your help !

jinxaw · Apr 1, 2015

I have a problem with the "#AdditionalRes:". When i add that line to my code, the compiler crashes with:

Convert byte code - optimized dex. Error
UNEXPECTED TOP-LEVEL ERROR:
java.lang.OutOfMemoryError: Java heap space

How can this happen?
Thank you very much in advance!

UPDATE:
I just realized that it's not "#AdditionalRes:..." line exclusively. But it is indeed something with the maps library. if i comment every evidence of maps-stuff out of my code (mfragment, gmap, manifest,...) the app works just fine...

UPDATE2:
As soon as i add the GoogleMaps library to my project, the error occurs while i try to compile my app.

Android Tutorial (old) Google Maps Android v2 tutorial

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