Google Map Marker

[Lon]

Does anyone have an example of how to retrieve the new location (Lat,Long) of a movable marker after it is dropped on the map? Thx.

 

[lagore]

Hi if you follow Klaus's mapview http://www.b4x.com/forum/basic4android-updates-questions/12573-webview-google-map.html#post71003 this uses a webview and 'WebViewExtras' then we need to add a listener for for the marker 'Dragend Event' add the following after the marker declaration (note marker0 is the name of my coded marker)

HtmlCode = HtmlCode & ";google.maps.event.addListener(marker0, 'dragend', function() {"
      HtmlCode = HtmlCode & "var MyMarker = marker0.getPosition();"
      HtmlCode = HtmlCode & "B4A.CallSub('MapViewer_MarkerChanged', true, MyMarker.lat(), MyMarker.lng() );"
      HtmlCode = HtmlCode & " })"

then we create a sub that is directed to from the javascript in the webview called "MapViewer_MarkerChanged" this has the coordinates of the dropped marker (once again 'MapViewer_MarkerChanged' was the code I used you can use anything once it all matches)

Sub MapViewer_MarkerChanged(Lat As String, Lng As String)
   Log(Lat & "," & Lng)
End Sub

You can also add 'Dragstart' and 'drag' listeners if you want to get the start marker position and the moving marker position.

 

[Lon]

That works great! Thanks so much for your help.
Only problem now is that I find it really hard to grab the little markers with my big fat finger. Is there any way to increase the "contact" size of the marker to make them easier to grab?

 

[warwound]

You need to use a bigger icon to increase the detected touch area.

Here's a tutorial that will show you how to do that: Google Maps API 3 – Markers | In usability we trust.

Martin.

 

[lagore]

You can either us a larger custom icon or specify a larger shape/area over the icon that is clickable/dragable, have a look at https://developers.google.com/maps/documentation/javascript/overlays#ComplexIcons it explains it well.

 

[Lon]

I can't seem to get Klaus's mapview to work on the AVD with API Level 10 running. The program just exits. All the other API levels seem to run it without any problems. Does anyone know if that is a problem with actual devices as well or is it just a AVD problem?