Android Question create random string (A-Z, 0-9) length = 9 [solved]

[ronell]

how to generate random string? see thread title

thanks in advance

 

[stevel05]

Try This:

Public Sub GetRandomString(Source As String,Count As Int) As String
    Dim Str As StringBuilder
    Str.Initialize
    For i = 0 To Count -1
        Str.Append(Source.CharAt(Rnd(0,Source.Length)))
    Next
    Return Str.ToString
End Sub

Usage:

Log(GetRandomString("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",9))

 

[nwhitfield]

How random do you want? You could also do something like use the Encryption library to produce one or more random numbers with the SecureRandom function. Use one of the message digest functions in the Encryption library to create a digest string, and then select nine characters from it, either using the function above, or simply picking a random start position for a substring.

 

[ronell]

How random do you want? You could also do something like use the Encryption library to produce one or more random numbers with the SecureRandom function. Use one of the message digest functions in the Encryption library to create a digest string, and then select nine characters from it, either using the function above, or simply picking a random start position for a substring.

thanks for the suggestion but im okay with @stevel05 code , dont want to add more libs in my project

 

[Erel]

Great example @stevel05. The most common mistake with Rnd keyword is that the end value is exclusive. This is taken care here.

 

[ronell]

Great example @stevel05. The most common mistake with Rnd keyword is that the end value is exclusive. This is taken care here.

much better if that code will be transfered in code snippet section

 

[Erel]

Go ahead. Anyone can post there...

 

[DonManfred]

much better if that code will be transfered in code snippet section

A similar post is already there. https://www.b4x.com/android/forum/threads/random-letter-generation.41631/#post-251637

 

[ronell]

Go ahead. Anyone can post there...

yeah but that code is not mine lol

 

[ronell]

A similar post is already there. https://www.b4x.com/android/forum/threads/random-letter-generation.41631/#post-251637

i see.. there is just a slight difference

 

[Erel]

A similar post is already there. https://www.b4x.com/android/forum/threads/random-letter-generation.41631/#post-251637

Note that your code misses the last character.

 

[DonManfred]

Fixed