android开发分享Android自定义实现日历控件

  <linearlayout xmlns:android="https://schemas.android.com/apk/res/android"      android:padding="20sp"      android:orientation="vertical"      android:layout_width="match_parent"      android:layout_height="match_parent">      <relativelayout          android:id="@+id/titlerl"          android:layout_width="match_parent"          android:layout_height="30dp">          <textview              android:id="@+id/lasttv"              android:text="上一月"              android:layout_alignparentleft="true"              android:gravity="center"              android:layout_width="wrap_content"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/monthtv"              android:text="十一月"              android:gravity="center"              android:layout_centerhorizontal="true"              android:layout_width="wrap_content"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/nexttv"              android:text="下一月"              android:gravity="center"              android:layout_alignparentright="true"              android:layout_width="wrap_content"              android:layout_height="30dp"></textview>      </relativelayout>      <linearlayout          android:id="@+id/weekll"          android:orientation="horizontal"          android:layout_width="match_parent"          android:layout_height="wrap_content">          <textview              android:id="@+id/tv7"              android:text="日"              android:gravity="center"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/tv1"              android:text="一"              android:gravity="center"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/tv2"              android:text="二"              android:gravity="center"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/tv3"              android:text="三"              android:gravity="center"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/tv4"              android:text="四"              android:gravity="center"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/tv5"              android:text="五"              android:gravity="center"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="30dp"></textview>          <textview              android:id="@+id/tv6"              android:text="六"              android:gravity="center"              android:layout_weight="1"              android:layout_width="0dp"              android:layout_height="30dp"></textview>      </linearlayout>      <gridview          android:id="@+id/calendarcv"          android:numcolumns="7"          android:layout_width="match_parent"          android:layout_height="match_parent"></gridview>  </linearlayout>

  <linearlayout xmlns:android="https://schemas.android.com/apk/res/android"      android:layout_width="match_parent"      android:layout_height="match_parent">      <textview          android:id="@+id/itemtv"          android:gravity="center"          android:layout_width="match_parent"          android:layout_height="match_parent"></textview>  </linearlayout>

  <androidx.constraintlayout.widget.constraintlayout xmlns:android="https://schemas.android.com/apk/res/android"      xmlns:app="https://schemas.android.com/apk/res-auto"      xmlns:tools="https://schemas.android.com/tools"      android:layout_width="match_parent"      android:layout_height="match_parent"      tools:context=".mainactivity">      <com.aye.newcalendar.newcalendar          android:id="@+id/calendarnc"          android:gravity="center"          android:layout_width="match_parent"          android:layout_height="match_parent"></com.aye.newcalendar.newcalendar>  </androidx.constraintlayout.widget.constraintlayout>

  public class newcalendar extends linearlayout {      private textview lasttv,nexttv,datetv;      private gridview calendargv;        private calendar calendar=calendar.getinstance();  //日历控件初始化      //重写三个构造方法      public newcalendar(context context) {          super(context);      }      public newcalendar(context context, @nullable attributeset attrs) {          super(context, attrs);          initcontrol(context);  //绑定控件      }      public newcalendar(context context, @nullable attributeset attrs, int defstyleattr) {          super(context, attrs, defstyleattr);          initcontrol(context);  //绑定控件      }      private void initcontrol(context context){          bindcontrol(context);  //绑定控件          bindcontrolevent();   //绑定控件事件      }        //绑定控件事件方法      private void bindcontrolevent() {          rendercalendar();          //“下一月”点击事件          nexttv.setonclicklistener(new onclicklistener() {              @override              public void onclick(view v) {                  calendar.add(calendar.month,+1);   //月份+1                  rendercalendar();              }          });          //“上一个”点击事件          lasttv.setonclicklistener(new onclicklistener() {              @override              public void onclick(view v) {                  calendar.add(calendar.month,-1);   //月份-1                  rendercalendar();              }          });      }        private void rendercalendar() {          simpledateformat sdf = new simpledateformat("mmm yyy");  //日期格式化          datetv.settext(sdf.format(calendar.gettime()));  //设置月份          arraylist<date> cells = new arraylist<>();          calendar calendar1 = (calendar) calendar.clone();  //克隆日历对象          calendar1.set(calendar.day_of_month, 1);  //置于当月第一天;          int prevdays = calendar1.get(calendar.day_of_week) - 1;  //获取上个月最后一天是星期几          calendar1.add(calendar.day_of_month, -prevdays);  //第一天            int maxcount = 6 * 7;  //设置每个月最大天数          //循环存入集合中          while (cells.size() < maxcount) {              cells.add(calendar1.gettime());              calendar1.add(calendar.day_of_month, 1);  //日期+1          }          //设置适配器          calendargv.setadapter(new calendaradapter(getcontext(),cells));      }                  //适配器      private class calendaradapter extends arrayadapter<date>{          layoutinflater layoutinflater;          public calendaradapter(@nonnull context context,arraylist<date> days) {              super(context, r.layout.item_layout,days);              layoutinflater=layoutinflater.from(context);          }          @nonnull          @override          public view getview(int position, @nullable view convertview, @nonnull viewgroup parent) {              date date=getitem(position);              viewholder viewholder;              if (convertview==null){  //初始化绑定                  convertview=layoutinflater.inflate(r.layout.item_layout,parent,false);                  viewholder=new viewholder();                  viewholder.itemtv=convertview.findviewbyid(r.id.itemtv);                  convertview.settag(viewholder);              }              viewholder= (viewholder) convertview.gettag();              int day=date.getdate();              viewholder.itemtv.settext(string.valueof(day));  //赋值            return convertview;          }          class viewholder{              textview itemtv;          }      }      private void bindcontrol(context context) {          layoutinflater inflater=layoutinflater.from(context);          inflater.inflate(r.layout.calendar_layout,this);            lasttv=findviewbyid(r.id.lasttv);          nexttv=findviewbyid(r.id.nexttv);          datetv=findviewbyid(r.id.datetv);          calendargv=findviewbyid(r.id.calendargv);      }  }

  date now=new date();  boolean isthesamemonth=false;  //是否与当前月份相同  //判断显示的日期月份与当前月份相同   if (date.getmonth()==now.getmonth()) {  //月份相同                  isthesamemonth = true;              }              //若显示的日期月份与当前月份相同,则设置字体颜色是黑色              if (isthesamemonth) {                  viewholder.itemtv.settextcolor(color.parsecolor("#000000"));              }              //设置当前日期字体为红色              if (now.getdate()==date.getdate()&&now.getmonth()==date.getmonth()&&now.getyear()==date.getyear()){                  viewholder.itemtv.settextcolor(color.parsecolor("#ff0000"));              }

  //长按事件接口  public interface newcalendarlistener{          void onitemclick(date date);      }            //适配器长按事件          calendargv.setonitemlongclicklistener(new adapterview.onitemlongclicklistener() {              @override              public boolean onitemlongclick(adapterview<?> parent, view view, int position, long id) {                  if (listener==null){                      return false;                  }else {                      //获取长按的位置，传入onitemclick方法中                      listener.onitemclick((date) parent.getitematposition(position));                      return true;                  }              }          });

  @override  protected void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);          setcontentview(r.layout.activity_main);          newcalendar calendar=findviewbyid(r.id.calendarnc);          calendar.listener=this;      }      //mainactivity实现长按事件接口      @override      public void onitemclick(date date) {          dateformat df= simpledateformat.getdateinstance();          toast.maketext(this,df.format(date),toast.length_short).show();      }