Android使用GridView实现日历的方法

public class CalendarAdapter extends BaseAdapter {  private static String TAG = "CalendarAdapter";  private boolean isLeapyear = false; //是否为闰年   private int daysOfMonth = 0;   //某月的天数   private int dayOfWeek = 0;    //具体某一天是星期几   private int lastDaysOfMonth = 0; //上一个月的总天数   private Context context;  private String[] dayNumber = new String[42]; //一个gridview中的日期存入此数组中   private SpecialCalendar sc = null;  private int currentYear = 0;  private int currentMonth = 0;    private int currentFlag = -1;    private String currentDayStr;  private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-M-d");  private Set<Integer> schDateTagFlag = new ArraySet<>(); //存储当月所有的日程日期(标签)  private String showYear = "";  //用于在头部显示的年份  private String showMonth = ""; //用于在头部显示的月份   private String animalsYear = "";  private String leapMonth = "";  //闰哪一个月   private Set<String> mSet = null;    private int jumpMonth = 0;  public CalendarAdapter(Context context, int year, int month, String currentDayStr) {    this.context = context;    sc = new SpecialCalendar();    currentYear = year;    currentMonth = month; //得到跳转到的月份    this.currentDayStr = currentDayStr;    getCalendar(currentYear, currentMonth);  }  @Override  public int getCount() {    return dayNumber.length;  }  @Override  public Object getItem(int position) {    return position;  }  @Override  public long getItemId(int position) {    return position;  }  @Override  public View getView(int position, View convertView, ViewGroup parent) {    ViewHolder myViewHolder = null;    if (convertView == null || convertView.getTag() == null) {      convertView = LayoutInflater.from(context).inflate(R.layout.item_select_time, null);      myViewHolder = new ViewHolder(convertView);      convertView.setTag(myViewHolder);    } else {      myViewHolder = (ViewHolder) convertView.getTag();    }    myViewHolder.mIdTvItemSelectTimeDay.setText(dayNumber[position]);    myViewHolder.mIdTvItemSelectTimeDay.setTextColor(Color.GRAY);//不是当前月为灰    if (position < daysOfMonth + dayOfWeek && position >= dayOfWeek) {      // 当前月信息显示       myViewHolder.mIdTvItemSelectTimeDay.setTextColor(Color.BLACK);// 当月字体设黑      myViewHolder.mIdTvItemSelectTimeDay.setTag(true);// 当月字体设黑    }else {      myViewHolder.mIdTvItemSelectTimeDay.setTag(false);// 当月字体设黑    }    if (currentFlag != -1 && currentFlag == position) {      //设置当天的背景      myViewHolder.mIdTvItemSelectTimeDay.setBackgroundResource(R.color.mainMenu);      myViewHolder.mIdTvItemSelectTimeDay.setTextColor(Color.WHITE);    } else {      myViewHolder.mIdTvItemSelectTimeDay.setBackgroundColor(0);    }    //显示小圆点    if (schDateTagFlag != null && schDateTagFlag.size() > 0) {      if (schDateTagFlag.contains(position)) {        if (myViewHolder.mIdImgItemSelectTimeLogo.getVisibility()!=View.VISIBLE) {          myViewHolder.mIdImgItemSelectTimeLogo.setVisibility(View.VISIBLE);        }      } else {        if (myViewHolder.mIdImgItemSelectTimeLogo.getVisibility()!=View.GONE) {          myViewHolder.mIdImgItemSelectTimeLogo.setVisibility(View.GONE);        }      }    } else {      if (myViewHolder.mIdImgItemSelectTimeLogo.getVisibility()!=View.GONE) {        myViewHolder.mIdImgItemSelectTimeLogo.setVisibility(View.GONE);      }    }    return convertView;  }    public void addMonth() {    jumpMonth++;  }    public void lessMonth() {    jumpMonth--;  }    public void upDataMonth() {    int stepYear;    int stepMonth = currentMonth + jumpMonth;    if (stepMonth > 0) {      //下一个月      if (stepMonth % 12 == 0) {        stepYear = currentYear + stepMonth / 12 - 1;        stepMonth = 12;      } else {        stepYear = currentYear + stepMonth / 12;        stepMonth = stepMonth % 12;      }    } else {      //上一个月      stepYear = currentYear - 1 + stepMonth / 12;      stepMonth = stepMonth % 12 + 12;    }    getCalendar(stepYear, stepMonth);  }    private void getCalendar(int year, int month) {    isLeapyear = sc.isLeapYear(year);       //是否为闰年     daysOfMonth = sc.getDaysOfMonth(isLeapyear, month); //某月的总天数     dayOfWeek = sc.getWeekdayOfMonth(year, month);   //某月第一天为星期几     lastDaysOfMonth = sc.getDaysOfMonth(isLeapyear, month - 1); //上一个月的总天数    getWeek(year, month);  }    private void getWeek(int year, int month) {    schDateTagFlag.clear();    currentFlag = -1;    int j = 1;    //得到当前月的所有日程日期(这些日期需要标记)    for (int i = 0; i < dayNumber.length; i++) {      if (i < dayOfWeek) { //前一个月        int temp = lastDaysOfMonth - dayOfWeek + 1;        dayNumber[i] = (temp + i) + "";      } else if (i < daysOfMonth + dayOfWeek) {//本月        int day = i - dayOfWeek + 1;  //得到的日期        dayNumber[i] = i - dayOfWeek + 1 + "";        //对于当前月才去标记当前日期         String yearStr = String.valueOf(year);        String monthStr =getStr(String.valueOf(month),2);        String dayStr =getStr(String.valueOf(day),2);        String timeAll = yearStr + monthStr + dayStr;        if (timeAll.equals(currentDayStr)) {//判断选中的位置          currentFlag = i;        }        if (mSet != null && mSet.size() > 0) {          for (String s : mSet) {//迭代器遍历判断是否需要带标签            if (timeAll.equals(s)) {              schDateTagFlag.add(i);            }          }        }        setShowYear(yearStr);        setShowMonth(String.valueOf(month));      } else {  //下一个月        dayNumber[i] = j + "";        j++;      }    }  }    public String getItemTime(int position) {    String month = getStr(getShowMonth(), 2);    String day = getStr(getDateByClickItem(position), 2);    return getShowYear() + month + day;  }    public static String getStr(String file,int bit) {    while (file.length() < bit)      file = "0" + file;    return file;  }    public String getDateByClickItem(int position) {    return dayNumber[position];  }    public int getStartPositon() {    return dayOfWeek + 7;  }    public int getEndPosition() {    return (dayOfWeek + daysOfMonth + 7) - 1;  }  public String getShowYear() {    return showYear;  }  public void setShowYear(String showYear) {    this.showYear = showYear;  }  public String getShowMonth() {    return showMonth;  }  public void setShowMonth(String showMonth) {    this.showMonth = showMonth;  }  public String getAnimalsYear() {    return animalsYear;  }  public void setAnimalsYear(String animalsYear) {    this.animalsYear = animalsYear;  }  public String getLeapMonth() {    return leapMonth;  }  public void setLeapMonth(String leapMonth) {    this.leapMonth = leapMonth;  }  public Set<String> getSet() {    return mSet;  }  public void setSet(Set<String> set) {    mSet = set;  }  static class ViewHolder {    @BindView(R.id.id_img_item_select_time_logo)    ImageView mIdImgItemSelectTimeLogo;    @BindView(R.id.id_tv_item_select_time_day)    TextView mIdTvItemSelectTimeDay;    ViewHolder(View view) {      ButterKnife.bind(this, view);    }  }}