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如何显示从星期日到星期六的当前星期日期？我正在创建应用程序，当单击下周或前一周时显示当前星期日期显示下一个或上一个日期我的代码在所有 7 个按钮上显示相同的日期

    public class MainActivity extends Activity {

public static int mYear;

public static int mMonth;
public static int mDay;

Button last_week;
Button next_week;
Button e00;
Button e01;
Button e02;
Button e03;
Button e04;
Button e05;
Button e06;

String completedate;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    e00 = (Button) findViewById(R.id.e00);
    e01 = (Button) findViewById(R.id.e01);
    e02 = (Button) findViewById(R.id.e02);
    e03 = (Button) findViewById(R.id.e03);
    e04 = (Button) findViewById(R.id.e04);
    e05 = (Button) findViewById(R.id.e05);
    e06 = (Button) findViewById(R.id.e06);

//  e01 = Mon;
//  e02 = Tues;
//  e03 = Wed;
//  e04 = thur;
//  e05 = Fri;


    last_week = (Button) findViewById(R.id.last_week);
    next_week = (Button) findViewById(R.id.next_week);


    Calendar mCalendar = Calendar.getInstance();
    mYear = mCalendar.get(Calendar.YEAR);
    mMonth = mCalendar.get(Calendar.MONTH) + 1;
    mDay = mCalendar.get(Calendar.DAY_OF_MONTH);

    completedate = mYear + "/" + String.format("%02d", mMonth)
            + "/" + String.format("%02d", mDay);

    last_week.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            e00.setText("");
            e01.setText("");
            e02.setText("");
            e03.setText("");
            e04.setText("");
            e05.setText("");
            e06.setText("");

            }

    });
    next_week.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            e00.setText("");
            e01.setText("");
            e02.setText("");
            e03.setText("");
            e04.setText("");
            e05.setText("");
            e06.setText("");
            }


    });

   // i want to show like this

   //       e01.setText(" 9/9/2013");
  //        e02.setText("10/9/2013");
  //        e03.setText("11/9/2013");
   //       e04.setText("12/9/2013");
   //       e05.setText("13/9/2013");




    DateFormat format = new SimpleDateFormat(completedate);
    Calendar calendar = Calendar.getInstance();
    calendar.setFirstDayOfWeek(Calendar.SUNDAY);
    calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);

    String[] days = new String[7];
    for (int i = 0; i < 7; i++)
    {
        days[i] = format.format(calendar.getTime());

        e00.setText(days[0]);
        e01.setText(days[1]);
        e02.setText(days[2]);
        e03.setText(days[3]);
        e04.setText(days[4]);
        e05.setText(days[5]);
        e06.setText(days[6]);



    }


}
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1 回答 1

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calendar.getTime() 返回当前时间。我认为你会想要使用：

Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);

在这种情况下，-1 给你前一天，+1 给你未来一天。因此，有了这些知识，您就可以跟踪从今天到您正在显示的那一周的时间差异。

这有意义吗？

编辑：

//positive numbers indicate future, negative past
int numberOfWeeksSinceTodaysDate = 0;
int dayOfTheWeek = cal.get(Calendar.DAY_OF_WEEK)

last_week.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Calendar cal = Calendar.getInstance();

        //Go back seven days
        numberOfWeeksSinceTodaysDate -= 7;
        cal.add(Calendar.DATE, numberOfWeeksSinceTodaysDate)
        e00.setText(cal.getTime());     

        //Go back eight days
        numberOfWeeksSinceTodaysDate--;
        cal.add(Calendar.DATE, numberOfWeeksSinceTodaysDate)
        e01.setText(cal.getTime());
        }

});
于 2013-09-13T18:39:06.780 回答