Question

我有几个按钮，我想随机出现，几秒后消失。如果它发生任何变化，我也希望它们在可见时可点击。

这就是我所拥有的：

public void fight() throws InterruptedException
{
    Random g = new Random();
    int move;
    for(int i = 0; i <= 3; i++)
    {
        move = g.nextInt(8);
        buttons[move].setVisibility(View.VISIBLE);
        buttons[move].setClickable(true);

        try{ Thread.sleep(5000); }catch(InterruptedException e){ }

        buttons[move].setVisibility(View.GONE);
        buttons[move].setClickable(false);
    }

}

当我尝试这样的时候，整个事情只会冻结20秒（大概每次循环5秒钟，没有任何反应。任何想法？

感谢。

Answer 1

试试这个

public void fight() throws InterruptedException
{
    Random g = new Random();
    int move;
    runOnUiThread(new Runnable() 
    {
        public void run() {
            while(makeACondition) {
            move = g.nextInt(8);
            buttons[move].setVisibility(View.VISIBLE);
            buttons[move].setClickable(true);

            if (System.currentTimeMillis() % 5000 == 0) {

                buttons[move].setVisibility(View.GONE);
                buttons[move].setClickable(false);
            }
          } 
       }
   }

}

Answer 2

private Handler mMessageHandler = new Handler();
Random g = new Random();
int move;

private Runnable mUpdaterRunnable = new Runnable() {
    public void run() {
        // hide current button
        buttons[move].setVisibility(View.INVISIBLE);
        // set next button
        move = g.nextInt(8);
        // show next button
        buttons[move].setVisibility(View.VISIBLE);

        // repeat after 5 seconds
        mMessageHandler.postDelayed(mUpdaterRunnable, 5000);
    }
};

首先，使用move = g.nextInt(8);（以避免空值）和mMessageHandler.post(mUpdaterRunnable);。

要停止，mMessageHandler.removeCallbacks(mUpdaterRunnable);。

正如xbonez所说，你也可以使用Timer与TimerTask来实现这一点。

Answer 3

你尝试过这种方式吗？

private int move;
public void fight() throws InterruptedException
{
    final Random g = new Random();
    runOnUiThread(new Runnable() 
    {
        public void run() {
            while(makeACondition) {
            move = g.nextInt(8);

            toggleButtonState(buttons[move]);
          } 
       }
   });
}

private void toggleButtonState(final Button button)
{
    new Handler().postDelayed(new Runnable() {

        @Override
        public void run() {
            if(button.isEnabled())
                button.setVisibility(View.GONE);
            else 
                button.setVisibility(View.VISIBLE);

        }
    }, 5000);

}

在Android中几秒后，按钮出现然后消失

3 个答案: