Util class providing unique IDs - dead simple but helpful in case of for example PendingIntents in notifications.

UniqueIdUtility.java

import java.util.Random;

public class UniqueIdUtility {

    static private int id;

    static {
        id = Integer.MIN_VALUE + new Random().nextInt(Integer.MAX_VALUE);
    }

    static public int getId() {
        int currentId = id;
        if (id == Integer.MAX_VALUE) {
            id = Integer.MIN_VALUE;
        } else {
            id += 1;
        }
        return currentId;
    }
}