How can I make a global have a unique number?

Question

I wish to retrieve a unique number every time I start my program (from the internet) and to be able to have access to it in every class without passing it every time. Is this possible? I believe this must be somehow standard as uniqueID and is used everyhere but I am new to Android and Java.

why do you want to retrieve it from the internet again? Is it not sufficient to generate a random number? — Dharini Chandrasekaran, Mar 28 '12 at 00:04

score 4 · Answer 1 · edited Mar 28 '12 at 00:07

4

You can use the UUID class:

UUID.randomUUID().toString();

edited Mar 28 '12 at 00:07

Steve Kuo

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answered Mar 28 '12 at 00:04

Perception

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to access it "from anywhere", you can assign it to a static member in an existing class or create a holder class for this purpose. – Jeffrey Blattman Mar 28 '12 at 00:09

score 2 · Accepted Answer · edited May 23 '17 at 11:56

2

Here is a previous solution that might be useful... Android global variable

Alternatively, you could declare a public static String, set the value of the String in the first class, and then each access to this String from other classes would return this same value.

For example...

Class 1...

public static String uniqueID;
uniqueID = <code_to_generate_random_value>;

Class 2, 3, 4..., where you want to get the value that was already set...

String uniqueID = Class1.uniqueID;

edited May 23 '17 at 11:56

Community

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answered Mar 28 '12 at 00:55

The question wasnot to generate a random number – Mar 29 '12 at 02:11

score 1 · Answer 3 · answered Mar 28 '12 at 00:37

you can use singleton pattern

create a class with desired name using singleton pattern

set the variable 'unique_id' to value which you get from internet or from uuid provider

use this classes singleton instance anywhere in your project and call unique_id's getter method

How can I make a global have a unique number?

3 Answers3