Android Question Cleaning Out Map Null Values Help???

Mashiane · Sep 8, 2016

Hi

I have a piece of code that I want to use to clean out all map values that are null to be empty strings.
As much as the map variable is passed and has values, the following piece of code always crashes where KeyList is assigned to xMap.Keys with a cannot be cast error.

My logs shows the map variable well enough

B4X:

Sub CleanMapNull(xMap As Map)
   Private KeysList As List
   Private key As String
   Private mVal As Object
   Private i As Int
   Log(xMap)
  
   KeysList.Initialize
   KeysList = xMap.Keys
  
   For i= 0 To KeysList.Size - 1
       key = KeysList.Get(i)
    mVal = xMap.Get(key)
    If mVal = "null" Then xMap.Put(key, "")
   Next
   
End Sub

Can someone please advise? Thanks

Mashiane · Sep 8, 2016

AndOrNot said:
Try this:

B4X:

Sub CleanMapNull(xMap As Map) As Map For Each k As String In xMap.Keys If xMap.Get(k) = "null" Or xMap.Get(k) = Null Then xMap.Put(k,"") Next Return xMap End Sub

You can't do KeysList = xMap.Keys, because xmap.keys is not a simple list, it is an iterableList

Thanks, strange enough, I think I once used similar code and it worked or I hoped it was working

B4X:

'Description: Sort a map by its keys in ascending order
'Tag: map, sort, asc
Sub SortMapKeys (m As Map, SortAsc As Boolean)
   Private KeysList As List
   Private m2 As Map
   Private key As String
   Private mVal As Object
   Private i As Int
   KeysList.Initialize
   m2.Initialize
 
   ' get all the keys
   KeysList = m.Keys
   KeysList.Sort(True)
 
   For i= 0 To KeysList.Size - 1
       key = KeysList.Get(i)
    mVal = m.Get(key)
    m2.Put(key, mVal)
   Next
  m.Clear
  For Each m2Key As String In m2.Keys
      m.Put(m2Key, m2.Get(m2Key))
  Next
End Sub

Android Question Cleaning Out Map Null Values Help???

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Android Question Cleaning Out Map Null Values Help???

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