Random Number Generator Without Repetition Class In Java

First of all, I'm a newbie Android App developer. In my App I need a class which generates random numbers in a given range avoiding repetition. I've searched much for this issue, b

Solution 1:

I guess this line is issue.

intindex = size * (int) Math.random();

This evaluates to Zero always.

Edit:

Just consolidating comments from Jeroen Vannevel and OP.

Math.random() will return a value between 0.0 and 1.0, which when cast with (int) will always evaluates to ZERO. You ca use as below.

intindex = (int) (size * Math.random());

Solution 2:

You should try using Random class:

http://developer.android.com/reference/java/util/Random.html

Randomrandom=newRandom();
intrandomNo= random.nextInt(10);  // 0 to 9