将数字从NumberPicker发送到另一个使用该数字作为CountDownTimer的开始时间的活动

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.NumberPicker;

public class SendNumberActivity extends AppCompatActivity {
    private NumberPicker numberPicker;
    private Button sendButton;

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

        numberPicker = findViewById(R.id.numberPicker);
        sendButton = findViewById(R.id.sendButton);

        numberPicker.setMinValue(1);
        numberPicker.setMaxValue(60);

        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int selectedNumber = numberPicker.getValue();

                Intent intent = new Intent(SendNumberActivity.this, ReceiveNumberActivity.class);
                intent.putExtra("selectedNumber", selectedNumber);
                startActivity(intent);
            }
        });
    }
}

import android.content.Intent;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;

public class ReceiveNumberActivity extends AppCompatActivity {
    private TextView countdownTextView;

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

        countdownTextView = findViewById(R.id.countdownTextView);

        Intent intent = getIntent();
        int selectedNumber = intent.getIntExtra("selectedNumber", 0);

        CountDownTimer countDownTimer = new CountDownTimer(selectedNumber * 1000, 1000) {
            @Override
            public void onTick(long millisUntilFinished) {
                long seconds = millisUntilFinished / 1000;
                countdownTextView.setText("倒计时：" + seconds + "秒");
            }

            @Override
            public void onFinish() {
                countdownTextView.setText("倒计时结束");
            }
        };

        countDownTimer.start();
    }
}