Android Room:将字符串日期转换为Long的类型转换器？

public class DateConverter {
    @TypeConverter
    public static Long fromDate(String date) {
        // 将字符串日期转换为Long类型
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
        try {
            Date parsedDate = format.parse(date);
            return parsedDate.getTime();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

    @TypeConverter
    public static String toDate(Long timestamp) {
        // 将Long类型转换为字符串日期
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
        return format.format(new Date(timestamp));
    }
}

@Database(entities = {User.class}, version = 1)
@TypeConverters(DateConverter.class)
public abstract class AppDatabase extends RoomDatabase {
    // 数据库操作方法...
}

@Entity
public class User {
    // 其他字段...

    @TypeConverters(DateConverter.class)
    private String birthDate;

    // Getter和Setter方法...
}