How to use Timer and TimerTask 타이머 사용하기

Timer와 TimerTask를 이용해 정해진 시간에 반복적인 작업을 할 수 있다.

public class MainActivity extends AppCompatActivity {
 
    TextView textView;
    Timer timer;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        textView = findViewById(R.id.textView);
        final SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy.MM.dd EEE HH:mm:ss");
 
        TimerTask timerTask = new TimerTask() {
            @Override
            public void run() {
                // Only the original thread that created a view hierarchy can touch its views.
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        String currentTime = simpleDateFormat.format(new Date());
                        textView.setText(currentTime);
                    }
                });
            }
        };
 
        timer = new Timer();
        timer.schedule(timerTask, 0, 1000);
    }
 
    @Override
    protected void onDestroy() {
        timer.cancel();
        super.onDestroy();
    }
}