Android Question Get emoticons (emoji) from string one-by-one

[plager]

Hello community,
I am struggling to get emoticons from the string one-by-one.
Consider this:
I have a string with emoticons. This string is correctly displayed when displaying it as whole string .

Dim str as string = "????????❤️"
Log(str)

It correctly show the whole string.
But when I try to iterate if one character after another, it always gives me �. or ��.
I understand, that emoticons are binary characters and cannot be represented as one byte, but they are as two bytes.
However, when I do this code:

For i = 0 To str.Length - 1
    Log(str.CharAt(i))                ' this gives � or ��
    Log(str.Substring2(i,i+1))        ' this gives same ouput as CharAt.
Next

The idea is to create buttons for each character (emoji) in the string. When I put whole string to the button.text property, it is displayed correctly. But when I ietrate string, it gives me twice as much buttons and each of them has text as �.
Anybody has a clue how to achieve this?
Many thanks

 

[Erel]

Emojies are complicated and many of them are made of multiple characters.

For simple emojies you can use this code:

Private Sub LogEachSimpleEmoji(s As String)
    Dim b() As Byte = s.GetBytes("UTF-32LE")
    For i = 0 To b.Length - 3 Step 4
        Dim s As String = BytesToString(b, i, 4, "UTF-32LE")
        Log(s)
    Next
End Sub

If you want to handle more complex emojies then check the code in BCTextEngine (CreateBCTextCharsFromString).

 

[plager]

It works perfectly, Erel. Thank you very much for your comprehensive answer!
I have one more question: I obviously played with bytes to BytesToString function, but didn't get to coding as UTF-32LE. I tried UTF8, UTF-32BE. Where did you get UTF-32LE from? Is there any list of those codings?

 

[Alexander Stolte]

have one more question

Please make a new thread for each question you have.

 

[plager]

Please make a new thread for each question you have.

With all respect, this question is highly relative to original question, so I'd like to keep it here, please.

 

[DonManfred]

With all respect, this question is highly relative to original question, so I'd like to keep it here, please.

THIS is NOT the way this forum is designed.

As @Alexander Stolte wrote:

You should ALWAYS create a NEW THREAD for ANY NEW QUESTION.

One thread should summarize ONE question.
The Question in #1 IS ANSWERED.

Create a new thread for a new question