Android使用GridView实现日历的方法

/** * 日历gridview中的每一个item显示的textview */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;  /**   * 当前选中的日期位置   */  private int currentFlag = -1;  /**   * 当前选中天的字符串 例:20170830   */  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;  /**   * 距离当前月的差(上一个月-1,当前月0,下一个月+1)   */  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;  }  /**   * 下一个月   */  public void addMonth() {    jumpMonth++;  }  /**   * 上一个月   */  public void lessMonth() {    jumpMonth--;  }  /**   * 更新日历数据   */  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);  }  /**   * 得到某年的某月的天数且这月的第一天是星期几   *   * @param year   * @param month   */  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);  }  /**   * 将一个月中的每一天的值添加入数组dayNuber中   *   * @param year   * @param 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++;      }    }  }  /**   * 获取当前时间 样式:20170830   * @param position   * @return   */  public String getItemTime(int position) {    String month = getStr(getShowMonth(), 2);    String day = getStr(getDateByClickItem(position), 2);    return getShowYear() + month + day;  }  /**   * 保留N位整数,不足前面补0   *   * @param file String   * @param bit 位数   * @return   */  public static String getStr(String file,int bit) {    while (file.length() < bit)      file = "0" + file;    return file;  }  /**   * 点击每一个item时返回item中的日期   *   * @param position   * @return   */  public String getDateByClickItem(int position) {    return dayNumber[position];  }  /**   * 在点击gridView时，得到这个月中第一天的位置   *   * @return   */  public int getStartPositon() {    return dayOfWeek + 7;  }  /**   * 在点击gridView时，得到这个月中最后一天的位置   *   * @return   */  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);    }  }}

/** * 日历工具类 */public class SpecialCalendar {   private int daysOfMonth = 0;   //某月的天数   private int dayOfWeek = 0;    //具体某一天是星期几   /**   * 判断是否为闰年   * @param year   * @return   */  public boolean isLeapYear(int year) {    if (year % 100 == 0 && year % 400 == 0) {       return true;     } else if (year % 100 != 0 && year % 4 == 0) {       return true;     }     return false;   }  /**   * 得到某月有多少天数   * @param isLeapyear   * @param month   * @return   */  public int getDaysOfMonth(boolean isLeapyear, int month) {    switch (month) {     case 1:     case 3:     case 5:     case 7:     case 8:     case 10:     case 12:       daysOfMonth = 31;       break;     case 4:     case 6:     case 9:     case 11:       daysOfMonth = 30;       break;     case 2:       if (isLeapyear) {         daysOfMonth = 29;       } else {         daysOfMonth = 28;       }      }     return daysOfMonth;   }  /**   * 指定某年中的某月的第一天是星期几   * @param year   * @param month   * @return   */  public int getWeekdayOfMonth(int year, int month){    Calendar cal = Calendar.getInstance();    cal.set(year, month-1, 1);     dayOfWeek = cal.get(Calendar.DAY_OF_WEEK)-1;     return dayOfWeek;   }       } 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"       android:layout_width="match_parent"       android:layout_height="match_parent"       android:orientation="vertical">  <include    layout="@layout/layout_public_finish_menu"    />  <LinearLayout    android:layout_width="match_parent"    android:layout_height="40dp"    android:background="@color/bg_home_gone_menu"    android:gravity="center"    android:orientation="horizontal"    >    <ImageView      android:id="@+id/id_img_select_time_less"      android:layout_width="wrap_content"      android:layout_height="match_parent"      android:layout_weight="1"      android:padding="5dp"      android:src="@mipmap/ic_sd_time_less"      android:background="@drawable/selector_public_btn_bg"      />    <TextView      android:id="@+id/id_tv_select_time_show"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_weight="4"      android:gravity="center"      android:text="年月"      android:textColor="@color/white"      android:textSize="@dimen/default_big"      />    <ImageView      android:id="@+id/id_img_select_time_add"      android:layout_width="wrap_content"      android:layout_height="match_parent"      android:layout_weight="1"      android:padding="5dp"      android:src="@mipmap/ic_sd_time_add"      android:background="@drawable/selector_public_btn_bg"      />  </LinearLayout>  <GridView    android:id="@+id/id_gv_select_item"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:background="@drawable/bg_rectangle_null_black_1"    android:clickable="true"    android:gravity="center"    android:layout_gravity="center"    android:clipChildren="true"    android:listSelector="@null"    android:numColumns="7"    android:padding="1dp"    android:layout_margin="5dp"    android:stretchMode="columnWidth"    /></LinearLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@drawable/bg_rectangle_null_black_1">  <TextView    android:id="@+id/id_tv_item_select_time_day"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:text="天"    android:textSize="@dimen/default_big"    android:layout_margin="1dp"    android:textStyle="bold"    />  <ImageView    android:id="@+id/id_img_item_select_time_logo"    android:layout_width="5dp"    android:layout_height="5dp"    android:layout_margin="3dp"    android:src="@drawable/shap_doorbell_oval_red"    android:visibility="gone"    /></RelativeLayout>

 //传入当前的年,月..已经选中的时间(20170830) mAdapter = new CalendarAdapter(mContext, year_c, month_c, currentDayStr); mIdGvSelectItem.setAdapter(mAdapter); /**   * GridView Item的点击事件   */  private class MyGvListener implements AdapterView.OnItemClickListener {    @Override    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {      TextView mTv = (TextView) view.findViewById(R.id.id_tv_item_select_time_day);      boolean isOnClick = (boolean) mTv.getTag();      if (isOnClick) {        String time = mAdapter.getItemTime(position);        Intent mIntent = getIntent();        mIntent.putExtra("fileDate", time);        setResult(AppStart.SDVA_SDTA, mIntent);        finish();        Log.i(TAG,"当前选择的时间:" + time);      }    }  } /**   * 点击事件逻辑处理   */  private class MyListener implements View.OnClickListener {    @Override    public void onClick(View v) {      switch (v.getId()) {        //上一个月        case R.id.id_img_select_time_less:          mAdapter.lessMonth();          mHandler.sendEmptyMessage(UPDATA_TIME);          addTextToTopTextView(mIdTvSelectTimeShow);          break;        //下一个月        case R.id.id_img_select_time_add:          mAdapter.addMonth();          mHandler.sendEmptyMessage(UPDATA_TIME);          addTextToTopTextView(mIdTvSelectTimeShow);          break;      }    }  }private Set<String> dayEventCount = new HashSet<>();//设置需要显示标签的实际 mAdapter.setSet(dayEventCount);//更新  @Override  protected void uiHandlerMessage(Message msg) {    switch (msg.what) {      case UPDATA_TIME:        mAdapter.upDataMonth();        mAdapter.notifyDataSetChanged();        break;    }  }