如何将DatePickerDialog默认日期更改为用户最近选择的日期？

import android.app.DatePickerDialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

    private Button datePickerButton;
    private Calendar calendar;
    private int year, month, day;

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

        datePickerButton = findViewById(R.id.datePickerButton);

        // 获取保存的最近选择日期
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        long recentDateInMillis = sharedPreferences.getLong("recent_date", 0);

        calendar = Calendar.getInstance();
        if (recentDateInMillis != 0) {
            calendar.setTimeInMillis(recentDateInMillis);
        }

        year = calendar.get(Calendar.YEAR);
        month = calendar.get(Calendar.MONTH);
        day = calendar.get(Calendar.DAY_OF_MONTH);

        // 设置按钮文本为最近选择日期
        datePickerButton.setText(year + "-" + (month + 1) + "-" + day);

        datePickerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 创建DatePickerDialog并设置默认日期
                DatePickerDialog datePickerDialog = new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int selectedYear, int selectedMonth, int selectedDayOfMonth) {
                        // 保存最近选择日期
                        calendar.set(selectedYear, selectedMonth, selectedDayOfMonth);
                        long recentDateInMillis = calendar.getTimeInMillis();
                        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
                        SharedPreferences.Editor editor = sharedPreferences.edit();
                        editor.putLong("recent_date", recentDateInMillis);
                        editor.apply();

                        // 更新按钮文本为最近选择日期
                        datePickerButton.setText(selectedYear + "-" + (selectedMonth + 1) + "-" + selectedDayOfMonth);
                    }
                }, year, month, day);

                datePickerDialog.show();
            }
        });
    }
}