"blinking" boolean with system.currentTimeMillis()

Question

Why is this value always true? I just can't figure out how to have a boolean that "blinks" every second.

long millis = System.currentTimeMillis();
boolean blink = (Math.floor(millis/1000 + 0.5)==Math.floor(millis/1000));

Answer 1

This is how I'd do it

  long millis = System.currentTimeMillis();
  boolean blink = (millis % 2000) < 1000;

This uses the modulo % operator to determine how far into a repeating two second window the current time is. Then it sees if it's in the first half (0 to 999) of the window or the second half (1000 to 1999). This will result in a boolean value that alternates true and false every second.