java - Android Studio 中的计时器使用 Runnable

Question

我正在尝试做一个计时器，但它根本不起作用，而且我无法弄清楚我应该更改什么才能使其起作用。你们能帮帮我吗？

private TextView timer;
private boolean run = true;
private Integer a = 0;

...

public void Start(View view) {
    Thread t = new Thread(new Runnable() {
        @Override
        public void run() {
          try {

                    Integer count = a;
                    String sec = count.toString();
                    timer = findViewById(R.id.textView);
                    timer.setText(sec);
                    Thread.sleep(1000);

            } catch (Exception e) {
              timer.setText("Какая-то ошибка");

            } if (run) {
              a++;
            }

       }
    }
    );
    t.start();
}

Answer 1

尝试使用 Handler 而不是 Thread。

public void Start(View view) {
     final Handler handler = new Handler();
     Runnable runnable = new Runnable() {
        @Override
        public void run() {
            Integer count = a;
            String sec = count.toString();
            timer = findViewById(R.id.textView);
            timer.setText(sec);

            if (run) {
                a++;
            }

            handler.postDelayed(this, 1000);
        }
    };


    handler.postDelayed(runnable, 1000);
}