Android Question Rewrite python for B4X

Erel said:

B4X is mostly UI based. There is no console in mobile apps.

B4X:

Private Sub Button1_Click
Dim MyList As List = Array(24, 53, 76)
If MyList.IndexOf(EditText1.Text) > -1 Then
  Label1.Text = "you entered..."
Else
Label1.Text = "sorry, ...
End If
End Sub

(if the list can be very large, maybe 10k+ items, then you should use B4XSet from B4XCollections)

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aeric said:

For B4J Console (Non-UI)

B4X:

'Non-UI application (console / server application)
#Region Project Attributes
    #CommandLineArgs:
    #MergeLibraries: True
#End Region

Sub Process_Globals
    Private reader As TextReader
End Sub

Sub AppStart (Args() As String)
    InitReader
    Dim MyList As List = Array(24, 53, 76)
    Log("Enter a number to check if it is a lucky number")
    Dim Num As Int = ReadLine
    If MyList.IndexOf(Num) > -1 Then
        Log("You entered a lucky number")
    Else
        Log("Sorry, try again later")
    End If
End Sub

Sub InitReader
    Dim sys As JavaObject
    sys.InitializeStatic("java.lang.System")
    reader.Initialize(sys.GetField("in"))
End Sub

Sub ReadLine As String
    Return reader.ReadLine
End Sub

Note: You need to compile as Release and run the jar in CMD.

View attachment 116267

Simple Console IO in B4J?

I'm having trouble finding an example of a simple input/output Console example in the tutorial documentation. I've found bits and pieces like reading from a text file. But, essentially, how would one translate this Java example (see pic) to B4J? Thank you.

www.b4x.com

Non-UI Applications

B4J currently supports two types of applications: UI applications (based on JavaFX) and Non-UI applications. Non-UI applications are standard Java applications. Usually the input to such applications is with command line arguments. You should create a new project and select: The program...

www.b4x.com

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