Android Question error :android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that creat

[hanyelmehy]

When i try to make this code

Sub WebView1_PageFinished (Url As String)
    Dim Javascript As String
    Javascript="B4A.CallSub('ProcessHTML', false, document.documentElement.outerHTML)"
    WebViewExtras1.executeJavascript(MyWebV, Javascript)
End Sub
Sub ProcessHTML(Html As String)
    ProcessHtmlData(Html)
    Label1.Text="Any Thing"
End Sub

i get error when try to write any thing to label (i try to add label using code or using Activity.LoadLayout)

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

any help
Thank you

 

[mangojack]

from what I was able to find out after getting the same error .. B4A.CallSub runs on a non GUI thread , whereas all code involving GUI views etc .. must be run on the Main thread.

This was solved by downloading the threading library Here ...

then ...

Sub Globals
   Private Thread1 As Thread   'maybe should be Process_Globals ?
End Sub

Sub ProcessHTML(Html AsString)
  ProcessHtmlData(Html)

  Thread1.Initialise("Thread1")
  Thread1.RunOnGuiThread("Process_Views" , Null)
End Sub

Sub Process_Views
  Label1.Text="Any Thing"
End Sub

 

[mangojack]

As a follow up I found this ... I have not yet changed my code and tested.

In the webpage loaded in the WebView you must be using javascript such as:

B4A.CallSub('ProcessHTML', false, <some-value-here>)

Change the boolean parameter in the javascript to true:

B4A.CallSub('ProcessHTML', true, <some-value-here>);

The ProcessHTML Sub will now be executed on the main UI thread, not a background thread.

 

[hanyelmehy]

As a follow up I found this ... I have not yet changed my code and tested.

B4A.CallSub('ProcessHTML', false, <some-value-here>)

Change the boolean parameter in the javascript to true:

B4A.CallSub('ProcessHTML', true, <some-value-here>);

Thank you