B4J Question listview or gridview

R

Roycefer

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• Oct 14, 2015

• #2

https://www.b4x.com/android/forum/threads/tableview-tutorial.35542/#content

 

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raphipps2002

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• Oct 14, 2015

• #3

Ah I see...so successfully added rows to my 5 column table, one by one....I wanted to add up one particular column. But Dim r() As String = tblCB.Items.Get(j) causes a crash.

B4X:

For j  = 0 To tblCB.Items.Size-1
  
       Dim r() As String = tblCB.Items.Get(j)
        
        BankOut = BankOut + r(2)
      
        BankIn = BankIn + r(3)
              
    Next

What am I doing wrong?

 

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Daestrum

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• Oct 14, 2015

• #4

What is the actual error message you are getting ?

 

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R

Roycefer

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• Oct 14, 2015

• #5

What is the stack trace for the crash? There could be any of a number of possible problems. You might be trying to access an empty array element. You might be trying to cast a String to a numerical type and the cast is failing. But this is all just wild speculation without seeing the stack trace.

 

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raphipps2002

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• Oct 14, 2015

• #6

As I got your message i found this on the, dim r() as object = tb.items.get(j)

The object worked not string...thanks anyway

 

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Daestrum

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• Oct 14, 2015

• #7

As a tip. if you have 5 columns, create a type variable so you can refer to the columns by name
ie.

B4X:

Type datarow (a as object, b as object, bankOut as object, bankIn as object, e as object)

then your code becomes

B4X:

    ...
    Dim row As datarow = tblCB.Items.Get(j)
    BankOut = BankOut + row.bankOut
    BankIn = BankIn + row.bankIn
...

which is easier to read and less prone to adding the wrong column to your totals etc

 

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