从onRestart状态返回时如何在app中继续计时

public class MainActivity extends AppCompatActivity {
    private TextView timerTextView;
    private Handler handler;
    private Runnable runnable;
    private int seconds = 0;
    private boolean isTimerRunning = false;

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

        timerTextView = findViewById(R.id.timerTextView);
        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {
                seconds++;
                updateTimerText();
                handler.postDelayed(this, 1000);
            }
        };

        if (savedInstanceState != null) {
            seconds = savedInstanceState.getInt("seconds");
            isTimerRunning = savedInstanceState.getBoolean("isTimerRunning");
        }

        updateTimerText();
    }

    @Override
    protected void onStart() {
        super.onStart();
        if (isTimerRunning) {
            startTimer();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        pauseTimer();
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (isTimerRunning) {
            resumeTimer();
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("seconds", seconds);
        outState.putBoolean("isTimerRunning", isTimerRunning);
    }

    private void startTimer() {
        handler.postDelayed(runnable, 1000);
        isTimerRunning = true;
    }

    private void pauseTimer() {
        handler.removeCallbacks(runnable);
        isTimerRunning = false;
    }

    private void resumeTimer() {
        handler.postDelayed(runnable, 1000);
        isTimerRunning = true;
    }

    private void updateTimerText() {
        int minutes = seconds / 60;
        int remainingSeconds = seconds % 60;
        String time = String.format(Locale.getDefault(), "%02d:%02d", minutes, remainingSeconds);
        timerTextView.setText(time);
    }
}