How to generate random code for Android application email verification

Question

I am writing a new Android application that require the users to register and the system need to send emails to give them a code for email verification.

The random code need to be a 6-digit code that consisting numbers with uppercase alphabet, for example, 6H94BA. I have done some research and still cannot find anything. How to do that?

This is commonly done in the backend - not the Android application itself. There would be no safety benefit. — dipdipdip, Jun 29 '17 at 11:24
It is really not clear what you are asking for. You put up an unclear description of a work flow; but as said - it is not even clear where you expect what to happen. — GhostCat, Jun 29 '17 at 11:25

score 1 · Answer 1 · answered Jun 29 '17 at 11:30

1

You can do this.

 public static String getRandomString(){
    return UUID.randomUUID().toString().subString(0,5);
}

answered Jun 29 '17 at 11:30

Dishonered

8,449
9
37
50

score 1 · Accepted Answer · answered Jun 29 '17 at 11:33

1

Try this:

SecureRandom random = new SecureRandom();
String randomCode = new BigInteger(30, random).toString(32).toUpperCase();

answered Jun 29 '17 at 11:33

Sky

1,435
1
15
24

This is prefect. Thanks. – User1239 Jun 29 '17 at 11:45

How to generate random code for Android application email verification

2 Answers2