Network Example - NetworkOnMainThreadException


Licensed User
Longtime User
As a new user of b4a I have developed a couple of small apps and now I am attempting to develop a simple network app that will send a number (membership id) to a remote server and retrieve an associated number (golf handicap) from that server.

As a first step in my learning process I read the Network tutorial and downloaded the Network Example and attempted to run it.

The example fails on the line:
"sb.Append(tr.Readline) 'read at least one line "
with the error "android.os.NetworkOnMainThreadException"

My environment is:
Asus Transformer TF101 running Android version 4.0.3 (connected wireless to b4a)
Network Lib ver 1.21
Core Lib ver 2.01

no other Libraries included.

I have attempted, by browsing the forum threads and searching Google, to resolve the problem without success.

Any help (particularly a reference to a tutorial or other learning aid) would be much appreciated.

Code is below

'Activity module
Sub Process_Globals
   Dim Socket1 As Socket
End Sub

Sub Globals

End Sub

Sub Activity_Create(FirstTime As Boolean)

 Socket1.Connect("" , 13, 20000)
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

 Sub Socket1_Connected (Successful As Boolean)
 If Successful = False Then
   Msgbox(LastException.Message, "Error connecting")
 End If
 Dim tr As TextReader
 Dim sb As StringBuilder
 sb.Append(tr.ReadLine) 'read at least one line    
 Do While tr.Ready        
 Msgbox("Time received: " & CRLF & sb.ToString, "")    
 End Sub