googlemap trouble

I'm doing some experiments with googlemap looking to some examples in this website Google Maps API links
I load an example in a browser on the pc, for example this one:

Google Maps JavaScript API v3 Example: Complex Icons

I caputure the source code and put it in a text file "gmapSample.txt".
I transfer the text files on android device, then I try to run this simple application:

Dim Mymap as WebView
Dim HC as string
Dim List1 as List
Dim s as string
Dim hc as string

hc=""
List1 = File.ReadList(File.DirRootExternal, "gmapsample.txt")
For i = 0 To List1.Size - 1
s= List1.Get(i)
hc=hc & s
Next

mymap.LoadHtml(Hc)


I see a blank webpage, not the map as I see it on the PC.
This method work with simpler files, like this "hello world tutorial" :

Google Maps Javascript API V3 Tutorial - Google Maps JavaScript API V3 - Google Code

bou doesn't work with more complicated files.

Are there some mistakes ? Or are there some limitations in googlemap integration with b4a ?

Thanks
Marco