Android DatePicker控件存在一个已知的bug，即无法正确设置最大日期。以下是一个解决该bug的代码示例：

import android.app.DatePickerDialog;
import android.content.Context;
import android.os.Build;
import android.widget.DatePicker;

import java.lang.reflect.Field;
import java.util.Calendar;
import java.util.Date;

public class FixedDatePickerDialog extends DatePickerDialog {
    private int maxYear;
    private int maxMonth;
    private int maxDay;

    public FixedDatePickerDialog(Context context, OnDateSetListener listener, int year, int month, int dayOfMonth) {
        super(context, listener, year, month, dayOfMonth);
        getMaxDate(year, month, dayOfMonth);
    }

    private void getMaxDate(int year, int month, int dayOfMonth) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month, dayOfMonth);
        Date maxDate = calendar.getTime();

        Calendar maxCalendar = Calendar.getInstance();
        maxCalendar.setTime(maxDate);
        maxYear = maxCalendar.get(Calendar.YEAR);
        maxMonth = maxCalendar.get(Calendar.MONTH);
        maxDay = maxCalendar.get(Calendar.DAY_OF_MONTH);
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int month, int dayOfMonth) {
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
            DatePickerDialog datePickerDialog = (DatePickerDialog) view.getTag();
            if (datePickerDialog != null) {
                datePickerDialog.getDatePicker().setMaxDate(getMaxDate().getTime());
            }
        } else {
            super.onDateChanged(view, year, month, dayOfMonth);
        }
    }

    private Date getMaxDate() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(maxYear, maxMonth, maxDay);
        return calendar.getTime();
    }

    public static DatePickerDialog createFixedDatePickerDialog(Context context, int year, int month, int dayOfMonth, OnDateSetListener listener) {
        DatePickerDialog datePickerDialog = new FixedDatePickerDialog(context, listener, year, month, dayOfMonth);
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
            DatePicker datePicker = datePickerDialog.getDatePicker();
            try {
                Field mDelegateField = datePicker.getClass().getDeclaredField("mDelegate");
                mDelegateField.setAccessible(true);
                Object delegate = mDelegateField.get(datePicker);
                Field mMaxYearField = delegate.getClass().getDeclaredField("mMaxYear");
                mMaxYearField.setAccessible(true);
                mMaxYearField.set(delegate, year);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return datePickerDialog;
    }
}

使用方法：

FixedDatePickerDialog datePickerDialog = FixedDatePickerDialog.createFixedDatePickerDialog(this, year, month, day, new DatePickerDialog.OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
        // 处理日期选择事件
    }
});
datePickerDialog.show();

这段代码创建了一个FixedDatePickerDialog类，继承自DatePickerDialog，并覆盖了onDateChanged方法，以确保最大日期被正确设置。在Android 5.0及以上的版本中，通过反射设置mMaxYear字段来修复DatePicker控件的bug。