如何在描述中给出的场景中暂停程序执行？

Question

I am making an android app. Here's what I want: User clicks a button, button text changes to "xyz", and then the program waits for 1 second and then the button text changes to "abc".If I use Thread.sleep(1000) then the program does stop for a second but the button text doesn't change to "xyz" before the program goes to sleep.

Answer 1

You can use Handler to achieve this. Using postdelayed method you can do this. Below is the code to do this

button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                button.setText("xyz");   // text changed to xyz
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        button.setText("abc");   //text changed to abc after 1 second.
                    }
                },1000);
            }
        });