如何從日曆中獲取下一週的日期

Question

請幫助我我按照這個教程http://www.androidhub4you.com/2012/10/custom-calendar-in-android.html哪些顯示水平日曆和只顯示當前這周的日期此人幫助我修改此代碼how to get current week days in calender是工作正常以下是他的源代碼問題正在製作兩個新的按鈕btnpreviousweek，btnnextweek; i灣下週上點擊按鈕previousweek日期我怎麼做，TTO表明幫我

      public class MyCalendarActivity extends Activity implements 
OnClickListener { 
private static final String tag = "MyCalendarActivity"; 

private TextView currentMonth; 
// private Button selectedDayMonthYearButton; 
private ImageView prevMonth; 
private ImageView nextMonth; 
//private HorizontalListView calendarView; 

Button btnpreviousweek,btnnextweek; 


private GridView calendarView; 
private GridCellAdapter adapter; 
private Calendar _calendar; 
@SuppressLint("NewApi") 
private int month, year; 
private int actualYear, actualMonth, actualDay; 
@SuppressWarnings("unused") 
@SuppressLint({ "NewApi", "NewApi", "NewApi", "NewApi" }) 
private final DateFormat dateFormatter = new DateFormat(); 
private static final String dateTemplate = "MMMM yyyy"; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
    setContentView(R.layout.my_calendar_view); 






_calendar = Calendar.getInstance(Locale.getDefault()); 
month = _calendar.get(Calendar.MONTH) + 1; 
year = _calendar.get(Calendar.YEAR); 
actualYear = year; 
actualMonth = month; 
actualDay = _calendar.get(Calendar.DAY_OF_MONTH); 





Log.d(tag, "Calendar Instance:= " + "Month: " + month + " " + "Year: " 
    + year); 



btnpreviousweek = (Button) this.findViewById(R.id.btnpreviousweek); 
btnnextweek = (Button) this.findViewById(R.id.btnnextweek); 



    btnpreviousweek.setOnClickListener(new OnClickListener() { 

public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
//////////////////////////  what i write here   
    ///////////////////////// 
} 
    }); 



    btnnextweek.setOnClickListener(new OnClickListener() { 

    public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
//////////////////////////  what i write here   
///////////////////////// 
} 
    }); 





    prevMonth = (ImageView) this.findViewById(R.id.prevMonth); 
    prevMonth.setOnClickListener(this); 

    currentMonth = (TextView) this.findViewById(R.id.currentMonth); 
    currentMonth.setText(DateFormat.format(dateTemplate, 
    _calendar.getTime())); 

    nextMonth = (ImageView) this.findViewById(R.id.nextMonth); 
    nextMonth.setOnClickListener(this); 
    calendarView = (GridView) this.findViewById(R.id.calendar); 

    adapter = new GridCellAdapter(getApplicationContext(), 
    R.id.calendar_day_gridcell, month, year); 
    adapter.notifyDataSetChanged(); 
    calendarView.setAdapter(adapter); 
    } 

/** 
* 
* @param month 
* @param year 
*/ 
    private void setGridCellAdapterToDate(int month, int year) { 
    adapter = new GridCellAdapter(getApplicationContext(), 
    R.id.calendar_day_gridcell, month, year); 
    _calendar.set(year, month - 1, _calendar.get(Calendar.DAY_OF_WEEK)); 
    currentMonth.setText(DateFormat.format(dateTemplate, 
    _calendar.getTime())); 
    adapter.notifyDataSetChanged(); 
    calendarView.setAdapter(adapter); 
    } 

    @Override 
    public void onClick(View v) { 
if (v == prevMonth) { 
if (month <= 1) { 
    month = 12; 
    year--; 
    } else { 
    month--; 
} 
    Log.d(tag, "Setting Prev Month in GridCellAdapter: " + "Month: " 
     + month + " Year: " + year); 
    setGridCellAdapterToDate(month, year); 
} 
    if (v == nextMonth) { 
if (month > 11) { 
    month = 1; 
    year++; 
} else { 
    month++; 
} 
Log.d(tag, "Setting Next Month in GridCellAdapter: " + "Month: " 
     + month + " Year: " + year); 
setGridCellAdapterToDate(month, year); 
    } 

} 

    @Override 
public void onDestroy() { 
Log.d(tag, "Destroying View ..."); 
super.onDestroy(); 
    } 

// Inner Class 
public class GridCellAdapter extends BaseAdapter implements OnClickListener { 
private static final String tag = "GridCellAdapter"; 
private final Context _context; 

private final List<String> list; 
private static final int DAY_OFFSET = 1; 
private final String[] weekdays = new String[] { "Sun", "Mon", "Tue", 
    "Wed", "Thu", "Fri", "Sat" }; 
private final String[] months = { "January", "February", "March", 
    "April", "May", "June", "July", "August", "September", 
    "October", "November", "December" }; 
private final int[] daysOfMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 
     31, 30, 31 }; 
private int daysInMonth; 
private int currentDayOfMonth; 
private int currentWeekDay; 
private Button gridcell; 
private TextView num_events_per_day; 
private final HashMap<String, Integer> eventsPerMonthMap; 
private final SimpleDateFormat dateFormatter = new SimpleDateFormat(
    "dd-MMM-yyyy"); 

// Days in Current Month 
    public GridCellAdapter(Context context, int textViewResourceId, 
    int month, int year) { 
super(); 
this._context = context; 
this.list = new ArrayList<String>(); 
Log.d(tag, "==> Passed in Date FOR Month: " + month + " " 
     + "Year: " + year); 
Calendar calendar = Calendar.getInstance(); 
setCurrentDayOfMonth(calendar.get(Calendar.DAY_OF_MONTH)); 

setCurrentWeekDay(calendar.get(Calendar.DAY_OF_WEEK)); 

Log.d(tag, "New Calendar:= " + calendar.getTime().toString()); 
Log.d(tag, "CurrentDayOfWeek :" + getCurrentWeekDay()); 
Log.d(tag, "CurrentDayOfMonth :" + getCurrentDayOfMonth()); 

// Print Month 
printMonth(month, year); 

// Find Number of Events 
eventsPerMonthMap = findNumberOfEventsPerMonth(year, month); 
} 

private String getMonthAsString(int i) { 
return months[i]; 
} 

private String getWeekDayAsString(int i) { 
    return weekdays[i]; 
} 

private int getNumberOfDaysOfMonth(int i) { 
return daysOfMonth[i]; 
} 

public String getItem(int position) { 
return list.get(position); 
} 

@Override 
public int getCount() { 
return list.size(); 
} 

/** 
* Prints Month 
* 
* @param mm 
* @param yy 
*/ 









    private void printMonth(int mm, int yy) 
{ 
Log.d(tag, "==> printMonth: mm: " + mm + " " + "yy: " + yy); 
int trailingSpaces = 0; 
int daysInPrevMonth = 0; 

int currentMonth = mm - 1; 
String currentMonthName = getMonthAsString(currentMonth); 
daysInMonth = getNumberOfDaysOfMonth(currentMonth); 

Log.d(tag, "Current Month: " + " " + currentMonthName + " having " + 
daysInMonth + " days."); 

GregorianCalendar cal = new GregorianCalendar(yy, currentMonth, 
getCurrentDayOfMonth()); 
Log.d(tag, "Gregorian Calendar:= " + cal.getTime().toString()); 

int currentWeekDay = cal.get(Calendar.DAY_OF_WEEK) - 1; 
trailingSpaces = currentWeekDay; 

Log.d(tag, "Week Day:" + currentWeekDay + " is " + 
getWeekDayAsString(currentWeekDay)); 
Log.d(tag, "No. Trailing space to Add: " + trailingSpaces); 
Log.d(tag, "No. of Days in Previous Month: " + daysInPrevMonth); 

if (cal.isLeapYear(cal.get(Calendar.YEAR))) 
    if (mm == 2) ++daysInMonth; 
    else if (mm == 3) 
     ++daysInPrevMonth; 

// move at the begging of the week 
int i = getCurrentDayOfMonth(); 
int j = currentWeekDay; 
while (i > 1 && j > 0) 
{ 
    i--; 
    j--; 
} 
// print the week, starting at Sunday 
    for (j = 0; i <= daysInMonth && j < 7; i++, j++) 
{ 
    Log.d(currentMonthName, String.valueOf(i) + " " + 
getMonthAsString(currentMonth) + " " + yy); 
    // If it is the current date, printing in BLUE (Orange) 
    if (i == actualDay && mm == actualMonth && yy == actualYear) 
    { 
     list.add(String.valueOf(i) + "-BLUE" + "-" + 
    getMonthAsString(currentMonth) + "-" + yy); 
    } 
    else 
    { 
     list.add(String.valueOf(i) + "-WHITE" + "-" + 
getMonthAsString(currentMonth) + "-" + yy); 
    } 
} 
} 

/** 
* NOTE: YOU NEED TO IMPLEMENT THIS PART Given the YEAR, MONTH, retrieve 
* ALL entries from a SQLite database for that month. Iterate over the 
* List of All entries, and get the dateCreated, which is converted into 
* day. 
* 
* @param year 
* @param month 
* @return 
*/ 
    private HashMap<String, Integer> findNumberOfEventsPerMonth(int year, 
    int month) { 
HashMap<String, Integer> map = new HashMap<String, Integer>(); 

return map; 
} 

@Override 
public long getItemId(int position) { 
return position; 
} 

@Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
View row = convertView; 
if (row == null) { 
    LayoutInflater inflater = (LayoutInflater) _context 

.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    row = inflater.inflate(R.layout.screen_gridcell, parent, 
false); 
} 

// Get a reference to the Day gridcell 
gridcell = (Button) row.findViewById(R.id.calendar_day_gridcell); 
gridcell.setOnClickListener(this); 

// ACCOUNT FOR SPACING 

Log.d(tag, "Current Day: " + getCurrentDayOfMonth()); 
String[] day_color = list.get(position).split("-"); 
String theday = day_color[0]; 
String themonth = day_color[2]; 
String theyear = day_color[3]; 
if ((!eventsPerMonthMap.isEmpty()) && (eventsPerMonthMap != 
null)) { 
    if (eventsPerMonthMap.containsKey(theday)) { 
     num_events_per_day = (TextView) row 

.findViewById(R.id.num_events_per_day); 
     Integer numEvents = (Integer) 
eventsPerMonthMap.get(theday); 
     num_events_per_day.setText(numEvents.toString()); 
    } 
} 

// Set the Day GridCell 
gridcell.setText(theday); 
gridcell.setTag(theday + "-" + themonth + "-" + theyear); 
Log.d(tag, "Setting GridCell " + theday + "-" + themonth + "-" 
     + theyear); 

if (day_color[1].equals("GREY")) { 
    gridcell.setTextColor(getResources() 
      .getColor(R.color.lightgray)); 
} 
if (day_color[1].equals("WHITE")) { 
    gridcell.setTextColor(getResources().getColor(
      R.color.lightgray02)); 
} 
if (day_color[1].equals("BLUE")) { 
    gridcell.setText("(" + theday + ")"); 

gridcell.setTextColor(getResources().getColor(R.color.orrange)); 
} 
return row; 
} 

@Override 
public void onClick(View view) { 
String date_month_year = (String) view.getTag(); 
// selectedDayMonthYearButton.setText("Selected: " + date_month_year); 
Log.e("Selected date", date_month_year); 
try { 
    Date parsedDate = dateFormatter.parse(date_month_year); 
    Log.d(tag, "Parsed Date: " + parsedDate.toString()); 

} catch (ParseException e) { 
    e.printStackTrace(); 
} 
} 

public int getCurrentDayOfMonth() { 
return currentDayOfMonth; 
} 

private void setCurrentDayOfMonth(int currentDayOfMonth) { 
this.currentDayOfMonth = currentDayOfMonth; 
} 

public void setCurrentWeekDay(int currentWeekDay) { 
this.currentWeekDay = currentWeekDay; 
} 

public int getCurrentWeekDay() { 
return currentWeekDay; 
} 
} 
} 

Answer 1

，落實爲月視圖u需要創建自定義的周視圖：

這是我的」已經創建：

Calendar calendarGlobal; 
prevMonth.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       calendarGlobal.add(Calendar.WEEK_OF_YEAR, -1); 
       calculateWeek() 
      } 
     }); 


     nextMonth.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
     // TODO Auto-generated method stub 
     calendarGlobal = Calendar.getInstance(); 
     calculateWeek(); 
      } 
     }); 


private void calculateWeek() { 
     // TODO Auto-generated method stub 
     days.clear(); 
     // Set the calendar to monday of the current week 
     // calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); 
     DateFormat df = new SimpleDateFormat("dd"); 
     calendarGlobal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); 
     for (int i = 0; i < 7; i++) { 
      days.add(df.format(calendarGlobal.getTime())); 
      calendarGlobal.add(Calendar.DATE, 1); 
     } 


    } 

一旦u得到的值設置爲的TextView作爲textview.settext（days.get（0））爲週一等