Android Question Remove Duplicates From A ListView?

JTmartins

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• Mar 9, 2014

• #2

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.

 

Last edited: Mar 9, 2014

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Erel

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• Mar 9, 2014

• #3

Is the question about List or ListView?

 

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sule

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• Mar 9, 2014

• #4

its the ListView

 

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Erel

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• Mar 9, 2014

• #5

Assuming that the values are strings:

B4X:

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

 

Last edited: Apr 16, 2014

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sule

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• Mar 10, 2014

• #6

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

 

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MaCaveAVin

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• Apr 14, 2014

• #7

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

 

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Erel

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• Apr 16, 2014

• #8

Here:

B4X:

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

 

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