B4J Question String cannot be cast to [Ljava.lang.Object;

gezueb · Jan 20, 2021

Hi All
The code below casts an exception at the statement marked

B4X:

    Dim AL As List
    AL.Initialize
    AL.AddAll (Array As String("a", "b", "c","d","e","f","g","h","i","j","k","l","m"))
    AL.AddAll (Array As String("q", "r", "s","t","u","v","w","x","y","z","1","2","3"))
    For i = 0 To AL.Size-1
        Dim Row() As Object
        Row = AL.Get(i) 'throws exception
        TableViewAssetList.Items.Add(Row)
    Next

I cannot figure out why. Thanks for help.

agraham · Jan 20, 2021

Elementary mistake. You are trying to assign a String to an Array. You probably intended

Row(i) = AL.Get(i)
TableViewAssetList.Items.Add(Row(i))

Or

Dim Row As Object

But why not?

TableViewAssetList.Items.Add(AL.Get(i))

gezueb · Jan 20, 2021

But why not?

TableViewAssetList.Items.Add(AL.Get(i))

Sorry, Agraham, but this throws the same exception. Thats what I wanted to do in the first place

Andrew (Digitwell) · Jan 20, 2021

What version of Java are you compiling with?

gezueb · Jan 20, 2021

I found a solution that works:

B4X:

    Dim AL As List
    AL.Initialize
    Dim Row() As Object = Array ("a", "b", "c","d","e","f","g","h","i","j","k","l","m")
    AL.Add(Row)
    Dim Row() As Object = Array ("q", "r", "s","t","u","v","w","x","y","z","1","2","3")
    AL.Add(Row)
    Dim Row() As Object = Array ("A", "B", "C","D","E","F","G","H","I","J","K","L","M")
    AL.Add(Row)
    For i = 0 To AL.Size-1
        TableViewAssetList.Items.Add(AL.Get(i))
    Next

Thank you anyway, Agraham

Daestrum · Jan 20, 2021

Or maybe

B4X:

    TableViewAssetList.Items.AddAll(Array As String("a", "b", "c","d","e","f","g","h","i","j","k","l","m"))
    TableViewAssetList.Items.AddAll(Array As String("q", "r", "s","t","u","v","w","x","y","z","1","2","3"))
    TableViewAssetList.Items.AddAll(Array As String("A", "B", "C","D","E","F","G","H","I","J","K","L","M"))

Unless you need to build the list (this looks like test data in your post), if so you can just point the tableview at it after you build the list.

B4X:

TableViewAssetList.Items = AL

the plus side is any changes you make to the list will be reflected in the Tableview - downside if you clear the list the Tableview will be empty.

gezueb · Jan 20, 2021

Daestrum, thats an excellent idea, I will update my code with that:

B4X:

TableViewAssetList.Items = AL

By the way, yes, the data is just for tests. The final data will have to be individually calculated items, but as long as the result is strings, this will work okay. Thanks to all of you.

B4J Question String cannot be cast to [Ljava.lang.Object;

gezueb

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