Usb library problem with B4A2.2

Can you post the error message?

Here you go, this happens during compilation:

Compiling code. 0.22
Compiling layouts code. 0.50
Generating R file. 1.00
Compiling generated Java code. Error
B4A line: 59
Permission= device_UsbMan.HasAccessoryPermission(r.GetField(\
javac 1.6.0_26
src\com\thingstank\apps\arduino\main.java:385: HasAccessoryPermission(anywheresoftware.b4a.objects.usb.UsbManagerWrapper.UsbAccessoryWrapper) in anywheresoftware.b4a.objects.usb.UsbManagerWrapper cannot be applied to (android.hardware.usb.UsbAccessory)
_permission = _device_usbman.HasAccessoryPermission((android.hardware.usb.UsbAccessory)(_r.GetField("accessory")));
^
1 error

Can you post the relevant B4A code?

This code is already posted in the ADK postings This code works on 2.0 but not on 2.2

http://www.b4x.com/forum/basic4andr...1-arduino-mega-adk-project-basic4android.html

I think you will find that the original bug is fixed and so the workaround is no longer necessary. Try without reflection.

Right, good tip!

I will try that and thank you sir.

Hmm, does not work but maybe i'm doing it wrong.

Dim device_UsbAcc As UsbAccessory
Dim device_UsbMan As UsbManager

B4A line: 58
Permission= device_UsbMan.HasAccessoryPermission(device_UsbAcc)
javac 1.6.0_26
src\com\thingstank\apps\arduino\main.java:380: inconvertible types
found : anywheresoftware.b4a.objects.usb.UsbManagerWrapper.UsbAccessoryWrapper
required: android.hardware.usb.UsbAccessory
_permission = _device_usbman.HasAccessoryPermission((android.hardware.usb.UsbAccessory)(_device_usbacc));

Can you post the exact code that previously worked and now doesn't?

One for Erel I think. The xml says it wants an Android UsbAccessory

<name>HasAccessoryPermission</name>
<parameter>
<name>Accessory</name>
<type>android.hardware.usb.UsbAccessory</type>
</parameter>


whereas the code wants a basic4android UsbAccessoryWrapper :signOops:

public boolean HasAccessoryPermission(UsbAccessoryWrapper Accessory)
{
return manager.hasPermission(Accessory.accessory);
}

Agraham is of course correct.

V0.95 is attached. It will also be released as part of the next update.

Hi,

I kind of thought the same thing, noticed indeed the difference.

Hi,

I updated the library but still have a problem:

B4A line: 69
device_UsbMan.RequestAccessoryPermission(device_UsbAcc)
javac 1.6.0_26
src\com\thingstank\apps\arduino\main.java:397: inconvertible types
found : anywheresoftware.b4a.objects.usb.UsbManagerWrapper.UsbAccessoryWrapper
required: android.hardware.usb.UsbAccessory
_device_usbman.RequestAccessoryPermission((android.hardware.usb.UsbAccessory)(_device_usbacc));

I have done this Dim device_UsbAcc As UsbAccessory so that would be the one to check the permission for right?

Not sure anymore.

I actually think this whole piece of sample code isn't very good, it always shows me the dialog twice:

'initialize Usb Manager
device_UsbMan.Initialize
'create an accessory collection
Dim listAccessories () As UsbAccessory

' get accessories, main throw exception
Try
listAccessories = device_UsbMan.GetAccessories
For i = 0 To listAccessories.Length - 1
If listAccessories(i).Description = "thingstank" Then
device_UsbAcc = listAccessories(i)
End If
Next

If device_UsbAcc <> Null Then
Dim Permission As Boolean
Permission= device_UsbMan.HasAccessoryPermission(device_UsbAcc)
If Permission==True Then
device_UsbMan.OpenAccessory(device_UsbAcc)
If device_Stream.IsInitialized==False Then
Try
device_Stream.Initialize(device_UsbAcc.InputStream,device_UsbAcc.OutputStream,"deviceStream")
Catch
End Try
Else
End If
Else
device_UsbMan.RequestAccessoryPermission(device_UsbAcc)
Permission= device_UsbMan.HasAccessoryPermission(device_UsbAcc)
If Permission Then
device_UsbMan.OpenAccessory(device_UsbAcc)
Else
End If
If device_Stream.IsInitialized==False Then
Try
device_Stream.InitializePrefix(device_UsbAcc.InputStream,False,device_UsbAcc.OutputStream , "deviceStream")
Catch
End Try
Else
End If
End If
Else
End If
Catch
'do nothing
ToastMessageShow ("Could not get connected accessories!",False)
End Try

About the request permission issue, B4A v2.22 will be released soon and will include the corrected library. Sorry for that.

Hi,

The compilation error problem has been solved, thanks!