游戏冻结 - 运行启动X秒

Question

我正在制作一个游戏，用户可以按下通电。当用户按下通电时，我希望通电运行3秒钟，然后所有受影响的变量将恢复正常。我尝试了下面的代码（专注于速度图像在屏幕上比正常情况下快3秒）：

if (x2 >= power_remove_X && x2 < (power_remove_X + power_remove.getWidth())
                    && y2 >= power_remove_Y && y2 < (power_remove_Y + power_remove.getHeight())) {
      //image tapped
                power_start = System.currentTimeMillis();
                //Find out which power up and apply the effect
                Log.d("GameScreen", "Power 3 Selected");
                power_comparer(PowersScreen3.getDecodedChoice());
            }

private void power_comparer(Image decodedChoice) {
    // TODO Auto-generated method stub

    long currentTime = System.currentTimeMillis();
    long refresh = power_start + 3000;

 if (decodedChoice == Assets.powerup_speedup) {         
        Log.d("Powerup - Refresh", Long.toString(refresh));
        while (currentTime < refresh) {
            PowerConstants.popcorn_speed = 4;
            PowerConstants.popcorn_color_speed = 10;
            PowerConstants.popcorn_mad_speed = 4;
            speeduptapped = true;
            //Log.d("Powerups", "all popcorn speed up");
        }

但是，当我按下通电时，此代码会导致我的游戏冻结。我哪里错了？