How can I generate random number in range?

Question

I have 2 EditText. The user will enter the minimum number in the first EditText and the maximum in the second EditText.

There is one TextView to show the generated number and a Button to click after entering the minimum and maximum numbers

How to generate a number between 2 numbers the user entered and show it in TextView ?

Answer 1

Create a random number in the interval [0, max - min], and add min to it.

Random r = new Random();
int number = min + r.nextInt(max-min+1); //add +1 because nextInt generate in the half-open range [0, n).

For example if min = 10 and max = 20 :

1. r.nextInt(20-10+1) will generate a random number between 0 and 10
2. You add 10 to this number
3. You get a random number in the range [10 - 20]

Check the Random class.

To show it in your TextView, use String.valueOf :

myTextView.setText(String.valueOf(number));