Android倒计时计时器的日期和下一次活动？

import android.os.CountDownTimer;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MyCountDownTimer extends CountDownTimer {
    private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private Date targetDate;

    public MyCountDownTimer(long millisInFuture, long countDownInterval, Date targetDate) {
        super(millisInFuture, countDownInterval);
        this.targetDate = targetDate;
    }

    @Override
    public void onTick(long millisUntilFinished) {
        long diff = targetDate.getTime() - System.currentTimeMillis();
        String formattedTime = formatTime(diff);
        // 更新倒计时显示
        // textView.setText(formattedTime);
    }

    @Override
    public void onFinish() {
        // 执行下一次活动或事件的逻辑
        // startActivity(new Intent(MainActivity.this, NextActivity.class));
    }

    private String formatTime(long timeInMillis) {
        // 格式化时间差为需要的显示格式
        // ...
        return formattedTime;
    }
}

// 在Activity中使用倒计时计时器
public class MainActivity extends AppCompatActivity {
    private MyCountDownTimer countDownTimer;

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

        // 创建倒计时计时器，设置目标日期和时间
        Date targetDate = new Date(System.currentTimeMillis() + 24 * 60 * 60 * 1000); // 一天后的时间
        countDownTimer = new MyCountDownTimer(targetDate.getTime() - System.currentTimeMillis(), 1000, targetDate);
        countDownTimer.start();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 停止倒计时计时器
        countDownTimer.cancel();
    }
}