How can I generate a random number in a certain range?

Question

How can I create an app that generates a random number in Android using Eclipse and then show the result in a TextView field? The random number has to be in a range selected by the user. So, the user will input the max and min of the range, and then I will output the answer.

Answer 1

To extend what Rahul Gupta said:

You can use Java function int random = Random.nextInt(n).
This returns a random int in the range [0, n-1].

I.e., to get the range [20, 80] use:

final int random = new Random().nextInt(61) + 20; // [0, 60] + 20 => [20, 80] 

To generalize more:

final int min = 20; final int max = 80; final int random = new Random().nextInt((max - min) + 1) + min; 

Answer 2

Random r = new Random(); int i1 = r.nextInt(45 - 28) + 28; 

This gives a random integer between 28 (inclusive) and 45 (exclusive), one of 28,29,...,43,44.