java - 如何让所有进程暂停5秒然后继续执行？

Question

public class Main2Activity extends AppCompatActivity {
int square5 = 0;
int flag = 1;
int userclick5 = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    //here i set some click listeners. one example is as follows:
    ImageButton image_button1 = (ImageButton) findViewById(R.id.image_button1);
    image_button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            goToIB();
        }
    });
}
//click listener call this function. This function set the color of image button as green.
//Then it calls the function goTofirst3cpu()
    private int goToIB() {
    ImageButton imageButton5 = (ImageButton) findViewById(R.id.image_button5);
    if (imageButton5.isPressed() & square5 == 0) {
        {
            imageButton5.setImageResource(R.color.green_color);
            flag = flag + 1;
            square5 = square5 + 1;
            userclick5 = userclick5 + 1;
            goTofirst3cpu();
            return square5;
        }
    }
    return 0;
    }
    //This function shows red color in image button
    private void goTofirst3cpu() {
    ImageButton imageButton5 = (ImageButton) findViewById(R.id.image_button5);

    if (square5 == 0) {

        //HERE IS WHAT I NEED TO DO SOMETHING
        //when i do something, there will be a gap of 5 seconds 
        //before changing imagebutton's color from green to red.
        //?????????  WHAT I WILL DO HERE.  ??????

        imageButton5.setImageResource(R.color.red_color);
        square5 = square5 + 1;
    }

    }
    }

我用了 toast 之类的东西。还有系统时钟。但那些东西对我不起作用。 我需要休息 5 秒才能将图像按钮的颜色更改为红色。 我是编程新手。所以用简单的语言解释一下。 提前致谢......

Answer 1

解决方案:

try
{
  Thread.sleep(//milliseconds);
}
catch(InterruptedException e)
{
  //handles exception
}

Thread.sleep() 会暂停你的程序一段时间。 建议您捕获异常并正确处理它，因为它可能会给您的程序带来更多问题...

有关中断异常的信息在此重复问题中:

When does Java's Thread.sleep throw InterruptedException?

如果 Thread.sleep() 出现问题，另一种解决方案..

 int delay = 1000; //milliseconds
   ActionListener taskPerformer = new ActionListener() {
       int x = 0;
   public void actionPerformed(ActionEvent evt) {

           if(x == 5)
           {
              //change color of button...
           }

           x++;
       }
   };
   new Timer(delay, taskPerformer).start();

你可以做的是实现 Swing Timer在你的程序中。您将创建一个 Timer 对象来每 1000 毫秒触发一次操作。计时器内有一个每秒递增的变量(基本上每次触发操作时)，并在该变量等于 5 时执行某些操作。您还可以将计时器设置为 5000 毫秒而不是 1000 作为参数... 要点是，在一段时间后/做某事。