Android Question Remove Duplicates From A ListView?

[sule]

Is it possible to do a faster/better way for removing dupes from listview

Dim i As Int,j As Int
    For i = 0 To lstFav.Size - 1
            For j = lstFav.size -1 To (i + 1) Step -1
                If lstFav.GetItem(j) = lstFav.GetItem(i) Then
                  lstFav.RemoveAt( j)
                End If
            Next
        Next

this work flawlessly but i wonder is it better way for b4a im newbie
sorry for my English

 

[JTmartins]

This is me thinking very quickly...

If the itens are all of the same kind, let's say strings

Then you can do a List.Sort (one line of code)

Afterwards, it should be possible to compare an item with the one imediatly after. (only one for..next loop)

If they are equal you can eliminate the first one and move on to the next.

Opps..sorry. You mentioned LISTVIEW..I thought it was a LIST. So my post is probably useless.

 

[Erel]

Is the question about List or ListView?

 

[sule]

its the ListView

 

[Erel]

Assuming that the values are strings:

Dim m As Map
m.Initialize
Dim i As Int = 0
Do While i < list.GetSize
Dim item As String = list.GetItem(i)
If m.ContainsKey(item) Then
   list.RemoveAt(i)
   i = i - 1
Else
m.Put(item, "")
End If
i = i + 1
Loop

 

[sule]

Thank you Erel it looks like this method is faster than one that I was using

 

[MaCaveAVin]

Is there a way to do the same but without taking care of string case in list ?

 

[Erel]

Here:

Dim m As Map
m.Initialize
Dim i As Int = 0
Do While i < list.GetSize
Dim item As String = list.GetItem(i)
If m.ContainsKey(item.ToLowerCase) Then
   list.RemoveAt(i)
   i = i - 1
Else
m.Put(item.ToLowerCase, "")
End If
i = i + 1
Loop