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;
}
}