Android Question Detect type of Object of CustomListView_ItemClick

[GiovanniPolese]

Hi to Everybody here.
I would like to know whether it exists a way to understand the type of Object arriving from CustomListView_ItemClick(index,Object). This need arises from the following situation:
I have a CustomListView populated by file names, and file Objects. Some of the objects are obtained using File.ListFiles(dir) , while others are obtained reading a folder on an SD card, with ExternalStorage management. In other words, some are "normal" files, others are ExternalFile. When I select an item, the CustomListView_ItemClick sends an object as the value parameter.
If I want to read the file, I have to use (I suppose) different managements and therefore I need to know the "type" of the object. In the first case I will read files with usual procedure, while for the external file i need to use ExternalStorage etc. (all this, of course, if I don't miss something, as usual..)
BTW there may exist other solutons. Maybe I can keep two separate lists, containing only the first and only the second type of file, as a support of the CustomListView, and manage the problem. Or I can use Exception management for a "dirtier" solution, trying to cast the externalFile etc.. These are not my first choices, of course.
Thanks in advance

 

[LucaMs]

Simply save a Boolean value:
True if from File.ListFiles
False if from ExternalStorage
(or vice versa, if you prefer)

In the CLV, you can use a Checkbox or B4XSwitch (crossplatform).

 

[GiovanniPolese]

Answering to my question with a simple trick. I use the following code, which, for my specific need is enough:

Private Sub ListaFiles_ItemClick (Index As Int, Value As Object)
   dim NomeDelFile as string
   NomeDelFile=Value ' maybe simply a filename for first type of object, or an externalfile
    If NomeDelFile.Contains("Name=") Then '  is as externalFile, therefore contains other "particular" items, like "name=" ...
        Dim z() As String
        z=Regex.Split(",",NomeDelFile)
        Dim pos As Int
        pos=z(4).IndexOf("Name")
        NomeDelFile=z(4).SubString(pos+5) ' the name of the externalFile
    End If
End sub

 

[GiovanniPolese]

Maybe the analysis of the object cast to a string, like in my case, may be a way to distinguish the object type..

 

[GiovanniPolese]

Simply save a Boolean value:
True if from File.ListFiles
False if from ExternalStorage
(or vice versa, if you prefer)

In the CLV, you can use a Checkbox or B4XSwitch (crossplatform).

Or store the value you suggest as the Item.tag, I suppose. In general your suggestion is good. Thanks

 

[zed]

use Is to test the type.
B4A allows you to test the type of an object using the Is operator.

If Value Is ExternalFile Then
    ' This is a file from ExternalStorage
Else If Value Is String Then
    ' It's a normal file (path)
End If

But be careful: ExternalFile is not a native B4A type.
ExternalStorage files are generally JavaObjects.

So you can do:

If Value Is JavaObject Then
    ' External file
Else If Value Is String Then
    ' Normal file
End If

untested code