Android日历（1）

红太狼 2022-06-13 02:38 250阅读 0赞

刚刚才实现简单的显示日历，用gridview实现界面设计，比较简陋啊~~555，无奈实在是水平低级，等待逐步提升了。

实现内容：

1、显示日期信息

2、可变化月份

3、点击日期可以显示日记

4、双击日期或者双击日记备注的显示部分，可以跳转至日记编辑

5、添加关于备注的内容

6、每页日历需要有默认当前日，选中或者默认当前日需要有特定的背景色

7、加入设置功能

待实现内容：

特殊的日子要有特殊的颜色

记录代码，以免忘记。代码有误，概不负责。

package PrivateDiary.Activity;
    
    import java.util.Calendar;
    import android.app.Activity;
    import android.content.Context;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.Button;
    import android.widget.GridView;
    import android.widget.TextView;
    
    public class CanlenderActivity extends Activity{
    	Calendar ical = Calendar.getInstance();
    	int currentYear = ical.get(Calendar.YEAR);//保存当前信息
    	int currentMonth = ical.get(Calendar.MONTH);
    	int currentDay = ical.get(Calendar.DAY_OF_MONTH);
    	TextView CurrentDayView;
    	Button NextMonthBtn,PreMonthBtn;
    	GridView gridview;
    	@Override
    	public void onCreate(Bundle savedInstanceState){
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.calendar_main);
    		gridview = (GridView)findViewById(R.id.gridview_main);
    		//添加元素给GridView
    		GridAdapter gadapter = new GridAdapter(this, currentYear,currentMonth);
    		gridview.setAdapter(gadapter);
    		CurrentDayView = (TextView)findViewById(R.id.CurrentDayText);
    		updataDataView(currentYear,currentMonth);
    		NextMonthBtn = (Button)findViewById(R.id.NextMonthBtn);
    		PreMonthBtn = (Button)findViewById(R.id.PreMonthBtn);
    		NextMonthBtn.setOnClickListener(new NextMonthBtn_Listener());
    		PreMonthBtn.setOnClickListener(new PreMonthBtn_Listener());
    		
    	}
    	//显示下一个月的信息
    	private class NextMonthBtn_Listener implements OnClickListener{
    
    		@Override
    		public void onClick(View v) {
    			if(currentMonth == 11)
    			{
    				currentMonth = 0;
    				currentYear++;
    			}else{
    				currentMonth++;
    			}
    			gridview.setAdapter(new GridAdapter(CanlenderActivity.this,currentYear,currentMonth));
    			updataDataView(currentYear,currentMonth);
    		}
    		
    	}
    	//显示前一个月的信息
    	private class PreMonthBtn_Listener implements OnClickListener{
    
    		@Override
    		public void onClick(View v) {
    			if(currentMonth == 0)
    			{
    				currentYear--;
    				currentMonth = 11;
    			}else{
    				currentMonth--;
    			}
    			gridview.setAdapter(new GridAdapter(CanlenderActivity.this, currentYear, currentMonth));
    			updataDataView(currentYear,currentMonth);
    		}
    		
    	}
    	//刷新标题日期
    	private void updataDataView(int year, int month){
    		month++;
    		CurrentDayView.setText(year+"年"+month+"月");
    
    	}
    	public class GridAdapter extends BaseAdapter{
    		int week;
    		int monthDays;
    		Calendar cal = Calendar.getInstance();
    		//定义Context
    		private Context m_context;
    		private String[] number = new String[42];
    		public GridAdapter(Context c, int currentYear, int currentMonth){
    			m_context = c;
    			getweek(currentYear,currentMonth);
    		}
    		@Override
    		//获取个数
    		public int getCount() {
    			return number.length;
    		}
    		//获取位置
    		@Override
    		public Object getItem(int position) {
    			return position;
    		}
    		//获取ID
    		@Override
    		public long getItemId(int position) {
    			return position;
    		}
    
    		@Override
    		public View getView(int position, View convertView, ViewGroup parent) {
    			if(convertView == null){
    				//第一屏
    				convertView = LayoutInflater.from(m_context).inflate(R.layout.gridview_text, null);
    			}
    			TextView textview = (TextView)convertView.findViewById(R.id.gv_text);
    			String strpos = number[position];
    			textview.setText(strpos);
    			if((ical.get(Calendar.MONTH)==cal.get(Calendar.MONTH)&&ical.get(Calendar.YEAR)==cal.get(Calendar.YEAR))&&(position == currentDay+7+week))
    			{//当天信息颜色变化
    				textview.setBackgroundColor(R.color.Gray1);
    			}
    			if((position<=monthDays+week+7&&position>week+7)||position<7){
    			//添加颜色信息
    				textview.setTextColor(R.color.black);
    			}
    
    			return convertView;		
    			}
    		//获得天数
    		private int getMonthDays(int year, int month){
    			month++;//注意此处需要将月份加1
    			switch(month){
    			case 1:
    			case 3:
    			case 5:
    			case 7:
    			case 8:
    			case 10:
    			case 12:{
    				return 31;
    			}
    			case 4:
    			case 6:
    			case 9:
    			case 11:{
    				return 30;
    			}
    			case 2:{
    				if(((year%4==0)&&(year%100 != 0))||(year%400==0))
    					return 29;
    				else
    						return 28;
    				}
    				}
    			return 0;
    			}
    		private void getweek(int year, int month){
    			//将当前日历设为置顶月份的第一天
    			cal.set(year,month,1);
    			//获得指定月份的第1天使当前周的第几天
    			week = cal.get(Calendar.DAY_OF_WEEK)-2;
    			System.out.println("week="+week+"DAY_OF_WEEK="+cal.get(Calendar.DAY_OF_WEEK));
    			monthDays = getMonthDays(year, month);
    			int lastmonthDays = getMonthDays(year, month-1);//上月
    			number[0]="周日";
    			number[1]="周一";
    			number[2]="周二";
    			number[3]="周三";
    			number[4]="周四";
    			number[5]="周五";
    			number[6]="周六";
    			for(int i=0; i<number.length-7; i++){
    				//周一
    				if(i<=week){//上月显示
    					int temp = lastmonthDays - week;
    					number[i+7] = (temp +i)+"";
    				}else if(i <= monthDays+week){//当前月显示
    					number[i+7]=i-week+"";
    				}else{//下个月显示
    					for(int j=0;j<number.length-i;j++){
    						int temp=number.length-monthDays-week;
    						number[i+7]=temp-(j+1)+"";
    					}
    				}
    			}
    		}
    	}
    }

下面是xml文件

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation = "vertical"
      android:paddingLeft = "50dip"
      android:paddingRight = "50dip"
      android:background = "@color/BackGreen">
      <LinearLayout android:layout_height = "wrap_content"
      	android:layout_width = "fill_parent"
      	android:orientation = "horizontal"
      	android:gravity = "center_vertical">
      	<Button
      		android:id = "@+id/PreMonthBtn"
      		android:background = "@drawable/prev_month"
      		android:layout_width = "wrap_content"
      		android:layout_height = "wrap_content"
      		android:layout_weight = "1"
      />
      	<TextView 
      		android:id = "@+id/CurrentDayText"
      		android:layout_width = "wrap_content"
      		android:layout_weight = "1"
      		android:layout_height = "wrap_content"
      		android:gravity = "center"
      		android:textColor = "@color/black"
      		android:textSize = "36px"/>
      	<Button
      		android:id = "@+id/NextMonthBtn"
      		android:background = "@drawable/next_month"
      		android:layout_width = "wrap_content"
      		android:layout_height = "wrap_content"
      		android:layout_weight = "1"
      		android:layout_alignParentRight="true"/>
      </LinearLayout>
      <GridView
      	android:id = "@+id/gridview_main"
       android:background="#A9A9A9"
       android:padding="1.0dip"
       android:scrollbars="none"
       android:fadingEdge="none"
       android:layout_width = "fill_parent"
       android:layout_height="wrap_content"
       android:horizontalSpacing="1.0dip"
       android:verticalSpacing="1.0dip"
       android:numColumns="7"
       android:layout_centerHorizontal="true"
    
      />
    </LinearLayout>