B4J Library jGoogleMaps library

Erel · Jul 30, 2015

This library is similar to B4A and B4i GoogleMaps libraries.

It is based on this open source project: https://github.com/dlsc-software-consulting-gmbh/GMapsFX/ (Apache 2 license).
Under the hood it uses JavaFX WebView with GoogleMaps JavaScript API V3.

Using the map is quite simple. You need to initialize GoogleMap and then wait for the Ready event.
GoogleMap.AsPane returns the pane that holds the map. You should add this pane to the nodes tree.

Once the ready event is fired you can add markers or change the position.

Updates:

V2.00 - Depends on OpenJDK 19. Previous versions will not work.

1. OpenJDK 19.0.2 + OpenJFX 17.0.6: https://www.b4x.com/b4j/files/jdk-19.0.2.7z
2. Add to main module:

B4X:

#PackagerProperty: IncludedModules = javafx.web
#PackagerProperty: AdditionalModuleInfoString = exports com.lynden.gmapsfx;    exports com.lynden.gmapsfx.javascript;    exports com.lynden.gmapsfx.javascript.event;
#PackagerProperty: AdditionalModuleInfoString = exports com.lynden.gmapsfx.javascript.object;    exports com.lynden.gmapsfx.service.directions;    exports com.lynden.gmapsfx.service.elevation;  
#PackagerProperty: AdditionalModuleInfoString = exports com.lynden.gmapsfx.service.geocoding;    exports com.lynden.gmapsfx.shapes;    exports com.lynden.gmapsfx.zoom;

3. Add reference to jOkHttpUtils2.

Tip: to fix logging encoding issues with Java 19+, add this:

B4X:

#VirtualMachineArgs: -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8
#PackagerProperty: VMArgs = -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8

The standalone package will not work without steps 2 and 3.

rboeck · Mar 20, 2017

It's not possible, to write this code:
Dim Point as Latlng
Point.Latitude=12 (Property: Latitude is readonly)

In B4A and i think in all older versions of jgooglemaps.jar it was possible.

Erel · Mar 20, 2017

rboeck said:
In B4A and i think in all older versions of jgooglemaps.jar it was possible.

That's not correct. These properties are write only in B4A and in previous versions of jGoogleMaps.

gvoulg · Mar 20, 2017

Marker .remove and .label no longer exists.
Can we also have the latest version that supports them ?
George

Erel · Mar 21, 2017

You need to use GoogleMap.RemoveMarker (this change is related to a change in GMapFX).

What is the difference between Marker.Label and Marker.Text ?

gvoulg · Mar 22, 2017

label shows permanent on top of markers.

Erel · Mar 22, 2017

You can use this code:

B4X:

Sub SetMarkerLabel(m As Marker, text As String)
   Dim r As Reflector 'jReflection library
   r.Target = m
   r.RunMethod4("invokeJavascript", Array("setLabel", Array(text)), Array As String("java.lang.String", "[Ljava.lang.Object;"))
End Sub

Pedro Caldeira · Mar 27, 2017

I Get an error just by running the example, after a few seconds I get the following Error.

B4X:

Waiting for debugger to connect...
Program started.
Error occurred on line: 64 (Main)
java.lang.NullPointerException
    at com.lynden.gmapsfx.javascript.object.GoogleMap.internalGetZoom(GoogleMap.java:76)
    at com.lynden.gmapsfx.javascript.object.GoogleMap.zoomProperty(GoogleMap.java:93)
    at com.lynden.gmapsfx.javascript.object.GoogleMap.setZoom(GoogleMap.java:68)
    at anywheresoftware.b4j.objects.GoogleMapWrapper.MoveCamera(GoogleMapWrapper.java:219)
    at b4j.google.map.main._btnresetmap_action(main.java:161)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:612)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:226)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:90)
    at anywheresoftware.b4a.BA$2.run(BA.java:165)
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)

Matias Ferrer · Mar 28, 2017

Hello everyone.

I have a problem with jGoogleMaps with my application and also with the example application of the library.

After running the application, I wait for 5 seconds and the following error message appears:

"Oops! Something went wrong.

This page did not load Google Maps correctly. See the JavaScript console for technical details. "

I have updated the version of jGoogleMaps to 1.55 and my version of java to 1.8.0.121.
The error continues

Someone can help me.

Thank you!

Erel · Mar 28, 2017

Pedro Caldeira said:
I Get an error just by running the example, after a few seconds I get the following Error.

Please start a new thread for this.

Pedro Caldeira · Mar 28, 2017

Hi Erel,
FYI
have update the jdk to version 1.8.0_121 and I no longer have that error.
Thanks.

Pedro Caldeira · Mar 28, 2017

Had the same error again. No apparent reason. On minute is working, the other is not.
Going to open another thread.

bvonlaar · Apr 17, 2017

Erel said:

You can use this code:

B4X:

Sub SetMarkerLabel(m As Marker, text As String)
   Dim r As Reflector 'jReflection library
   r.Target = m
   r.RunMethod4("invokeJavascript", Array("setLabel", Array(text)), Array As String("java.lang.String", "[Ljava.lang.Object;"))
End Sub

Hi,
it works fine, but how can I change the color of the "text"

Benedikt

Erel · Apr 17, 2017

Please start a new thread for this question.

RichardHirst · Jun 26, 2017

Hello Erel

Is there any 'off-line' cache settings..?

Thanks

Richard

Erel · Jun 26, 2017

Please start a new thread for this question and make sure not to limit it to a single member.

marcick · Nov 12, 2017

I was reading in poste 72

- I added the AddMarker3 function, which allows to specify an origin and an anchor position for the marker icon

But I understand the method has then been removed for some reasons.
So ... this is still a wish ....

marcick · Nov 28, 2017

Not exactely, as far as I know. But you can check if a clicked point is inside a polygon, then do what you want.

https://www.b4x.com/android/forum/threads/point-inside-a-polygon-ray-casting-algorithm.64985/

klaus · Nov 28, 2017

magi6162 said:
there is an event like "clickPolygon" to select a polygon? Can the selected polygon change it (move nodes, etc ..)?

Yes.
You have the PolygonClick event when the user clicks on a polygon.
Then you can set it editable and / or draggable with the JavaObjects library.
Same for polyline and circle.

B4X:

Private Sub GMap_PolygonClick (SelectedPolygon As MapPolygon)
    Private joMapPolygon = SelectedPolygon As JavaObject
    joMapPolygon.RunMethod("setEditable", Array As Object(True))
    joMapPolygon.RunMethod("setDraggable", Array As Object(True))

You can also add a MouseMove event, look HERE.

marcick · Nov 28, 2017

wow .. I lost a piece ...

ivanomonti · Apr 10, 2018

error

B4X:

Waiting for debugger to connect...
Program started.
Errore nella linea: 188 (Main)
java.lang.NullPointerException
    at anywheresoftware.b4j.objects.GoogleMapWrapper.setMapType(GoogleMapWrapper.java:646)
    at b4j.example.main._listview1_selectedindexchanged(main.java:1511)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:613)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:228)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:93)
    at anywheresoftware.b4a.BA$1.run(BA.java:215)
    at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)

B4X:

    googlemap.MapType = googlemap.MAP_TYPE_SATELLITE
    Dim cp As CameraPosition
    cp.Initialize(45.622065, 9.1053143, 18)
    googlemap.MoveCamera(cp)

B4J Library jGoogleMaps library

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