java - 如何检查我选择了一周中的哪一天以及是否是周末

Question

我已经在日期选择器中编写了代码。它工作正常。现在我想添加一项功能。无论是工作日还是周末。我想要一些指南，说明需要使用哪种方法来检查我选择的日期以及它是周末还是工作日。拜托，任何人都可以检查我的代码并指导我。我们将不胜感激。提前致谢。

public class DateTimePickerActivity extends AppCompatActivity implements
        View.OnClickListener,
       TimePickerDialog.OnTimeSetListener


      // TimePickerDialog.OnTimeSetListener
{
    //Declaration for class
    ButtonViews views;
    dpListener dpListenerView;
    // Declartion for member vairables
    int day, month, x_year;
    int hour;
    int minute;
    Calendar calendar;

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

        views = new ButtonViews();
        dpListenerView = new dpListener();

        //ButtonListener
        views.button_date.setOnClickListener(this);
        views.button_time.setOnClickListener(this);
        //

       // pick up the default date using Calender class
         calendar =  GregorianCalendar.getInstance(TimeZone.getTimeZone("GMT"), Locale.getDefault());

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

        hour = calendar.get(Calendar.HOUR_OF_DAY);
        minute = calendar.get(Calendar.MINUTE);

        setupDate(day, month, x_year);
        setupTime(hour, minute);
   }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button_date:
                showDatePickerDialog();
                break;
            case R.id.button_time:
                  showTimePickerDialog();
                break;
        }
    }


    private void setupTime(int hours, int minutes) {
        views.button_time.setText(hours + ":" + minutes);
    }

    private void setupDate(int day, int month, int year) {

        String strMonth = ((month + 1) <= 9) ? ("0" + (month + 1)) : String.valueOf(month + 1);
                  views.button_date.setText(String.valueOf(day) + "/" + strMonth + "/" + String.valueOf(year));
    }
    private void showDatePickerDialog() {
        DatePickerDialog datepickerdialog = new DatePickerDialog
                (
                        this,
                         dpListenerView,
                       /* new DatePickerDialog.OnDateSetListener() {
                            @Override
                            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                            } },*/
                        //this,

                        x_year,
                        month,
                        day
                );

           datepickerdialog.show();
    }


 /*   private OnDateSetListener dpListener = new OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
               *//* day = dayOfMonth;
                month = monthOfYear;
                x_year = year;*//*
                setupDate(dayOfMonth,monthOfYear,year);
            }

        };*/


    public void showTimePickerDialog() {

      TimePickerDialog   timePickerDialog = new TimePickerDialog(
                DateTimePickerActivity.this,
                this,
                hour,
                minute,
                true
         );


        timePickerDialog.show();
    }

//    @Override
//    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
//        setupDate(dayOfMonth,monthOfYear,year);
//    }

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        setupTime(hourOfDay, minute);
    }


   class ButtonViews {

        Button button_time;
        Button button_date;

        public ButtonViews() {
            button_date = (Button) findViewById(R.id.button_date);
            button_time = (Button) findViewById(R.id.button_time);
        }
    }

  class dpListener implements OnDateSetListener
  {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                day = dayOfMonth;
                month = monthOfYear;
                x_year = year;

            int i = calendar.get(Calendar.DAY_OF_WEEK);
            switch (i) {
                case 1:
                    Toast.makeText(DateTimePickerActivity.this
                            , "You have selected " + calendar.SUNDAY
                            , Toast.LENGTH_SHORT);
                    break;

                default:
                    setupDate(dayOfMonth,monthOfYear,year);
            }
        }

    }
}

Answer 1

试试这段代码

Calendar yourCalendar;

int dayOfWeek = yourCalendar.get(Calendar.DAY_OF_WEEK); // it will returns 1 (Calendar.SUNDAY) to 7 (Calendar.SATURDAY)

那你应该检查一下

If(dayOfWeek == 7 || dayOfWeek == 1){
  // as your requirement: you should display mesage they can not select the weekend" here
  // then you set the value in datepickerdialog by current date
  return "weekend";
}else{
  return "week date";
}