如何在Android中使用ViewPager进行无限制的寻呼机

概述当我滑动月视图时,我想在我的日历中显示无限的viewpager.我怎样才能做到这一点？我想我需要3个片段才能做到这一点.但是,当我向左或向右滑动时,我不知道如何更新月份(片段).我在下面附上了我的代码.我给出了我不知道编码的问号.这是我的项目：https://github.com/lolyoshi/CalendarWid

当我滑动月视图时,我想在我的日历中显示无限的vIEwpager.我怎样才能做到这一点？我想我需要3个片段才能做到这一点.但是,当我向左或向右滑动时,我不知道如何更新月份(片段).我在下面附上了我的代码.我给出了我不知道编码的问号.
这是我的项目：https://github.com/lolyoshi/CalendarWidget

任何帮助表示赞赏.

InfinitedPagerAdapter.java

public class InfinitePagerAdapter extends FragmentPagerAdapter{    CalendarVIEw[] fragList;      int fragNumber = 3;    public InfinitePagerAdapter(FragmentManager fm, CalendarVIEw[] fragList) {        super(fm);        this.fragList = fragList;    }    @OverrIDe    public int getItemposition(Object object) {        // Todo auto-generated method stub        return position_NONE;    }    @OverrIDe    public Fragment getItem(int position) {        return fragList[position];          }    @OverrIDe    public int getCount() {        return fragNumber;    }    public voID setCalendar(????) {          //Need to update 3 fragments           ??????????????????????    }    @OverrIDe    public boolean isVIEwFromObject(VIEw arg0, Object arg1) {        // Todo auto-generated method stub        return false;    }}

CalendarWidget.java

public class CalendarWidget extends FragmentActivity {    VIEwPager monthPage;    private static final int PAGE_MIDDLE = 1;    private int mSelectedPageIndex = 1;    public Calendar curMonth;    InfinitePagerAdapter monthPageAdapter;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.calendar_layout);        CalendarVIEw[] fragList = new CalendarVIEw[3];        curMonth = Calendar.getInstance();        Calendar prevMonth, nextMonth;        prevMonth = (Calendar) curMonth.clone();        nextMonth = (Calendar) curMonth.clone();        prevMonth.set(Calendar.MONTH, prevMonth.get(Calendar.MONTH) - 1);        nextMonth.set(Calendar.MONTH, nextMonth.get(Calendar.MONTH) + 1);        fragList[0] = CalendarVIEw.newInstance(prevMonth);        fragList[1] = CalendarVIEw.newInstance(curMonth);        fragList[2] = CalendarVIEw.newInstance(nextMonth);        monthPage = (VIEwPager)findVIEwByID(R.ID.pager);        monthPageAdapter = new InfinitePagerAdapter(getSupportFragmentManager(), fragList);        monthPage.setonPagechangelistener(new VIEwPager.OnPagechangelistener() {            @OverrIDe            public voID onPageScrollStateChanged(int arg0) {                // Todo auto-generated method stub                 if (mSelectedPageIndex < PAGE_MIDDLE) {                     curMonth.add(Calendar.MONTH, -1);                    } else if (mSelectedPageIndex > PAGE_MIDDLE) {                        curMonth.add(Calendar.MONTH, 1);                        }                                        //Need to update 3 fragments                    monthPageAdapter.setCalendar(????);                        monthPage.setCurrentItem(1, false);            }            @OverrIDe            public voID onPageScrolled(int arg0, float arg1, int arg2) {                // Todo auto-generated method stub            }            @OverrIDe            public voID onPageSelected(int arg0) {                // Todo auto-generated method stub                mSelectedPageIndex = arg0;            }});        monthPage.setAdapter(monthPageAdapter);        monthPage.setCurrentItem(1, false);    }    }

CalendarVIEw.java

public class CalendarVIEw extends Fragment{    protected static Calendar calendar;    protected final Calendar itemmonth;    private Calendaradapter calendaradapter;    private linearLayout calendarLayout;    public ArrayList<String> items;    ArrayList<String> event;    ArrayList<String> desc;    public Handler handler;    private int mMonth, mYear;    private static final int PAGE_left = 0;    private static final int PAGE_MIDDLE = 1;    private static final int PAGE_RIGHT = 2;    static CalendarVIEw newInstance(?????) {        //What can I put in this function?        return f;    }    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }    @OverrIDe    public VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container,            Bundle savedInstanceState) {        calendarLayout = (linearLayout)inflater.inflate(R.layout.calendar_layout, container, false);        final GrIDVIEw calendarDayGrID = (GrIDVIEw)calendarLayout.findVIEwByID(R.ID.calendar_days_grID);        calendarDayGrID.setAdapter(new ArrayAdapter<String>(getActivity(), R.layout.day_cell, getResources().getStringArray(R.array.days_array)));        final GrIDVIEw calendarGrID = (GrIDVIEw)calendarLayout.findVIEwByID(R.ID.calendar_grID);        calendarGrID.setontouchListener(new OntouchListener(){            @OverrIDe            public boolean ontouch(VIEw v, MotionEvent event) {                if(event.getAction() == MotionEvent.ACTION_MOVE){                    return true;                }                return false;            }        });        calendarGrID.setonItemClickListener(new DayItemClickListener());        displayMetrics displaymetrics = new displayMetrics();        getActivity().getwindowManager().getDefaultdisplay().getMetrics(displaymetrics);        int height = displaymetrics.heightPixels;        int wIDth = displaymetrics.wIDthPixels;        float grIDHeight = height*3/4 - 3*(convertDptopixels(50, getActivity())); //fix the height of table of days in week = 25dp        calendaradapter = new Calendaradapter(getActivity(), calendar, grIDHeight);        updateCurrentMonth();                 calendarGrID.setAdapter(calendaradapter);        return calendarLayout;    }    public CalendarVIEw() {        calendar = Calendar.getInstance();        itemmonth = (Calendar) calendar.clone();    }    protected voID updateCurrentMonth() {        calendaradapter.refreshDays();        //handler.post(calendarUpdater);        TextVIEw month = (TextVIEw)calendarLayout.findVIEwByID(R.ID.month_Title);                month.setTextcolor(color.BLACK);        int monthID = calendar.get(Calendar.MONTH);        int[] monthIDs = {R.string.january,R.string.february,R.string.march,R.string.april,R.string.may,R.string.june,                R.string.july,R.string.august,R.string.september,R.string.october,R.string.november,R.string.december};        month.setText(monthIDs[monthID]);        String tmp = (String) month.getText();        month.setText(tmp + " " + calendar.get(Calendar.YEAR));    }    protected final voID onNextMonth() {        if (calendar.get(Calendar.MONTH) == Calendar.DECEMBER) {            calendar.set((calendar.get(Calendar.YEAR) + 1), Calendar.JANUARY, 1);        } else {            calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) + 1);        }        updateCurrentMonth(calendar);    }    protected final voID onPrevIoUsMonth() {        if (calendar.get(Calendar.MONTH) == Calendar.JANUARY) {            calendar.set((calendar.get(Calendar.YEAR) - 1), Calendar.DECEMBER, 1);        } else {            calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH)-1);        }        updateCurrentMonth(calendar);    }    public static float convertDptopixels(float dp,Context context){        Resources resources = context.getResources();        displayMetrics metrics = resources.getdisplayMetrics();        float px = dp * (metrics.densityDpi/160f);        return px;    }    public static float convertPixelsToDp(float px,Context context){        Resources resources = context.getResources();        displayMetrics metrics = resources.getdisplayMetrics();        float dp = px / (metrics.densityDpi / 160f);        return dp;       }    private final class DayItemClickListener implements OnItemClickListener {        @OverrIDe        public voID onItemClick(AdapterVIEw<?> parent, VIEw vIEw, int position, long ID) {            final TextVIEw dayVIEw = (TextVIEw)vIEw.findVIEwByID(R.ID.date_in_cell);            final CharSequence text = dayVIEw.getText();            if (text != null && !"".equals(text)) {                calendaradapter.setSelected(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), Integer.valueOf(String.valueOf(text)));            }        }           }}

解决方法:

您滑动时月份不更新的原因是您已声明受保护的静态日历日历;静态的.删除静态后,所有三个页面都会显示不同的月份.

保持您的日历视图与github一样,除了此更改：

static CalendarVIEw newInstance(Calendar a) {    CalendarVIEw f = new CalendarVIEw(a);    return f;}public CalendarVIEw(Calendar cal) {    calendar = cal;}

您的适配器将如下所示：

public class InfinitePagerAdapter extends FragmentPagerAdapter{    CalendarVIEw[] fragList;      public InfinitePagerAdapter(FragmentManager fm, CalendarVIEw[] fragList) {        super(fm);        this.fragList = fragList;    }    @OverrIDe    public Fragment getItem(int position) {        return fragList[position];    }    @OverrIDe    public int getCount() {        return fragList.length;    }}

最后在您的Calendar小部件中修改如下：

@OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_calendar_Widget);        final CalendarVIEw[] fragList = new CalendarVIEw[3];        curMonth = Calendar.getInstance();        Calendar prevMonth, nextMonth;        prevMonth = (Calendar) curMonth.clone();        nextMonth = (Calendar) curMonth.clone();        prevMonth.set(Calendar.MONTH, prevMonth.get(Calendar.MONTH) - 1);        nextMonth.set(Calendar.MONTH, nextMonth.get(Calendar.MONTH) + 1);        fragList[0] = CalendarVIEw.newInstance(prevMonth);        fragList[1] = CalendarVIEw.newInstance(curMonth);        fragList[2] = CalendarVIEw.newInstance(nextMonth);        monthPage = (VIEwPager) findVIEwByID(R.ID.pager);        monthPageAdapter = new InfinitePagerAdapter(getSupportFragmentManager(), fragList);        monthPage.setonPagechangelistener(new VIEwPager.OnPagechangelistener() {            @OverrIDe            public voID onPageScrollStateChanged(int arg0) {                // Todo auto-generated method stub                if (arg0 == VIEwPager.SCRolL_STATE_IDLE) {                    if (mSelectedPageIndex < PAGE_MIDDLE) {                        fragList[0].onPrevIoUsMonth();                        fragList[1].onPrevIoUsMonth();                        fragList[2].onPrevIoUsMonth();                    } else if (mSelectedPageIndex > PAGE_MIDDLE) {                        fragList[0].onNextMonth();                        fragList[1].onNextMonth();                        fragList[2].onNextMonth();                    }                    monthPage.setCurrentItem(1, false);                }            }            @OverrIDe            public voID onPageScrolled(int arg0, float arg1, int arg2) {                // Todo auto-generated method stub            }            @OverrIDe            public voID onPageSelected(int arg0) {                // Todo auto-generated method stub                mSelectedPageIndex = arg0;            }        });        monthPage.setAdapter(monthPageAdapter);        monthPage.setCurrentItem(1, false);    }

这就是你需要做的.一切都应该按照需要运作.

注意：尽管一切正常,但克隆和传递日历对象可能不是最好的选择.日历对象很昂贵.如果可能的话,你应该绕过时间.从here获取一些动力

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