Web Service that runs on Android Device

There's an example of creating a B4A web server here: http://www.b4x.com/forum/basic4android-updates-questions/13683-simple-web-server-2.html#post78107

I can't imagine getting a scripting language such as PHP or ASP to run within such a server though but maybe you can intercept the web service requests and return your data using B4A.

Martin.

You will need to implement a Http server. It will be pretty difficult.

Consider using an external server which will be updated from the Android device (and accessed by the other devices).

I think I will try to implement TCP/IP socket (in Windows WinSock) approach.

I am planning to write a TCP/IP listener in Android. Which library should I use?

Look at the source code of the B4A WebServer that i posted previously.
It should show you exactly what you can implement on the B4A device to listen for web service requests (i think).

Martin.

Thank you "warwound" the example you have given solved my problem.

I took the HTTP example and change "AStreams_NewData" procedure as follows :

Sub AStreams_NewData (Buffer() As Byte)
Dim Bconv As ByteConverter
Dim msg As String
Dim FN As Filepath
'Log("buffer=" & BytesToString( Buffer, 0, Buffer.Length, "UTF8"))
Dim command() As String
command = Regex.Split(" ",BytesToString( Buffer, 0, Buffer.Length, "UTF8"))
If command(0) = "GET" Then
Select Case command(1).ToLowerCase
Case "/favicon.ico"
msg = HTTP.HandleGetRequest(Bconv.StringToBytes("GET /favicon.ico HTTP/1.1", "UTF8"), AStreams)
Case "/command=1"
msg = HTTP.HandleGetRequest(Bconv.StringToBytes("GET /1.XML HTTP/1.1", "UTF8"), AStreams)
Case "/command=2"
msg = HTTP.HandleGetRequest(Bconv.StringToBytes("GET /2.XML HTTP/1.1", "UTF8"), AStreams)
Case Else
msg = HTTP.HandleGetRequest(Bconv.StringToBytes("GET /ERROR.XML HTTP/1.1", "UTF8"), AStreams)
End Select
Else
msg = HTTP.HandleGetRequest(Bconv.StringToBytes("GET /ERROR.XML HTTP/1.1", "UTF8"), AStreams)
End If
FN = HTTP.MapDirectory(msg)
End Sub


Now when android device runs this little http server code, with any browser with in the same network you can issue a command like "http:<android_server_ip>:<default_port>/command=1" (eg http://192.168.1.51:8080/command=1). The above code interprets command number returns the data as an XML file.

I think Case "/favicon.ico" is necessary otherwise browser hangs.

Thank you everyone, and hope that this quick sample gives you new ideas.