Obfuscated problem with WebView and javascript

[bluedude]

Hi,

Attached demo runs well in Release mode but does not in Release (obfuscated mode).

It is a webview knob (with WebViewextras) that controls the volume level of the music.

Try running it in both modes. In obfuscated mode the knob still works but does not trigger the changeValue event anymore.

The .zip is too big for this forum, download it at: http://www.things.io/downloads/knob.zip

 

[Erel]

I haven't download the project. However if the event sub doesn't include an underscore it will be renamed and therefore will not work.

 

[warwound]

Yes Erel's right, here's the offending code:

B4A.CallSub('changeValue', true,e)

Your B4A Sub changeValue will not exist after obfuscation, adding an underscore anywhere in the Sub name and then updating the line in Sub loadKnob:

html = html & "B4A.CallSub('changeValue', true,e)"

Should fix things.

The project didn't compile unfortunately - screengrab about missing resource attached.

Was that in the download but not marked read-only perhaps?

Martin.

 

[bluedude]

Interesting bug

Thanks for the tip and issue.

Interesting, need to clean up the project.

 

[bluedude]

Resource

Actually this is the holo style supported by Google, it isn't a separate resource.

When I zip and open the project and compile it works without a problem.

You can use (see Android design guidelines) different holo themes for different API versions.

I will delete it for now because obviously it needs more testing.

Cheers,

 

[warwound]

My B4A installation is set up to compile using the Android API version 8 android.jar - would that explain it?

Martin.

 

[bluedude]

Holo

Could be I always compile with the highest API, Erel seems to advice that. When compiling on the high API I also always do a test run on my oldest device, the HTC Hero.

Cheers,

 

[mixer69]

Hello,

I've got the same problem here.

'Activity module
Sub Process_Globals
   'These global variables will be declared once when the application starts.
   'These variables can be accessed from all modules.

End Sub

Sub Globals
   'These global variables will be redeclared each time the activity is created.
   'These variables can only be accessed from this module.

End Sub

Sub Activity_Create(FirstTime As Boolean)

   Dim JSContent As WebViewExtras
   Dim MsgContent As WebView
   Dim HTMLContent As StringBuilder
   Dim HTMLContent2String As String
   
   MsgContent.Initialize("")
   HTMLContent.Initialize
   
   MsgContent.JavaScriptEnabled = True
   JSContent.addWebChromeClient(MsgContent, "")
   JSContent.addJavascriptInterface(MsgContent, "B4A")

   HTMLContent.Append("<script language='JavaScript'>")
   HTMLContent.Append("function sendProfilId(userid){")
   HTMLContent.Append("alert(userid);")
   HTMLContent.Append("B4A.CallSub('GetProfil', true, userid);")
   HTMLContent.Append("}</script>")
   HTMLContent.Append("<img onclick='javascript:sendProfilId(154);' src='http://www.fruityclub.net/site/images/smoove/logo.png' width='100px' />")

   HTMLContent2String = HTMLContent.ToString
   MsgContent.LoadHtml(HTMLContent2String)
   Activity.AddView(MsgContent, 0, 0, 100%x, 100%y)
   
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub GetProfil(UserId As Int)
   Msgbox("ProfilID = " & UserId, "TEST")
End Sub

With or without underscore in the sub name, i've got "java.lang.Exception: Sub getprofil signature does not match expected signature." in debug and release mode. In obfuscated it do nothing !

EDIT: in obfuscated mode, without underscore, it do nothing. With underscore, i've got error message above.

Can you please help ?

Thanks,
remi

 

[margret]

Try the code below. See changes in Callsub and sub name.

'Activity module
Sub Process_Globals
   'These global variables will be declared once when the application starts.
   'These variables can be accessed from all modules.

End Sub

Sub Globals
   'These global variables will be redeclared each time the activity is created.
   'These variables can only be accessed from this module.

End Sub

Sub Activity_Create(FirstTime As Boolean)

   Dim JSContent As WebViewExtras
   Dim MsgContent As WebView
   Dim HTMLContent As StringBuilder
   Dim HTMLContent2String As String
   
   MsgContent.Initialize("")
   HTMLContent.Initialize
   
   MsgContent.JavaScriptEnabled = True
   JSContent.addWebChromeClient(MsgContent, "")
   JSContent.addJavascriptInterface(MsgContent, "B4A")

   HTMLContent.Append("<script language='JavaScript'>")
   HTMLContent.Append("function sendProfilId(userid){")
   HTMLContent.Append("alert(userid);")
   HTMLContent.Append("B4A.CallSub('GetProfil_', true, userid);")
   HTMLContent.Append("}</script>")
   HTMLContent.Append("<img onclick='javascript:sendProfilId(154);' src='http://www.fruityclub.net/site/images/smoove/logo.png' width='100px' />")

   HTMLContent2String = HTMLContent.ToString
   MsgContent.LoadHtml(HTMLContent2String)
   Activity.AddView(MsgContent, 0, 0, 100%x, 100%y)
   
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Sub GetProfil_(UserId As Int)
   Msgbox("ProfilID = " & UserId, "TEST")
End Sub

 

[mixer69]

Thanks for the reply!

Unfortunately, i still get the message 'java.lang.Exception: Sub getprofil_ signature does not match expected signature.' after js alert ...

EDIT:
If i change this line :

Sub GetProfil_(UserId As String)

it works! But "UserId" is an integer !