更新安卓DatePickerDialog中的日期，带今日按钮，不关闭对话框

import android.app.DatePickerDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

    private Button todayButton;
    private DatePickerDialog datePickerDialog;

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

        todayButton = findViewById(R.id.today_button);

        // 获取当前日期
        Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);

        // 创建DatePickerDialog对象，并设置初始日期为当前日期
        datePickerDialog = new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                // 处理日期改变事件
                // 这里可以根据需要进行相应的操作，例如更新UI或发送网络请求等
            }
        }, year, month, day);

        // 设置"今日"按钮的点击事件
        todayButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 获取当前日期
                Calendar calendar = Calendar.getInstance();
                int year = calendar.get(Calendar.YEAR);
                int month = calendar.get(Calendar.MONTH);
                int day = calendar.get(Calendar.DAY_OF_MONTH);

                // 更新DatePickerDialog的日期
                datePickerDialog.updateDate(year, month, day);
            }
        });

        // 显示DatePickerDialog
        datePickerDialog.show();
    }
}