[안드로이드] 간단하고 쉬운 달력 소스(GridView)

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GridView로 간단한 달력을 만들어 보겠습니다.

1. 레이아웃 생성
-현재 연/월을 보여줄 텍스트뷰와 Calendar를 작성할 그리드뷰를 사용합니다.

res->layout

activity_calendar.xml      (@color/color_ffffff를 사용하시려면 color.xml에 작업해주세요.)

<?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:background="@color/color_ffffff" >

    <TextView
        android:id="@+id/tv_date"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="@color/color_21a4ff"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:textColor="@color/color_ffffff"
        android:textSize="20sp" />
    
    <GridView
        android:layout_marginTop="10dp"
        android:id="@+id/gridview"
        android:layout_weight="1"
        android:layout_height="0dp" 
        android:layout_width="match_parent"
        android:numColumns="7"
        android:listSelector="@color/transparent"
        >
    </GridView>

</LinearLayout>

 

item_calendar_gridview.xml

<?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:gravity="center">
    
    <TextView 
        android:gravity="center_horizontal"
        android:id="@+id/tv_item_gridview"
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:textSize="20sp"
        />
    
</LinearLayout>

 

2. 자바코드 작성
CalendarActivity.java

package com.example.calendar;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;

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.GridView;
import android.widget.TextView;

public class CalendarActivity extends Activity {

    /**
     * 연/월 텍스트뷰
     */
    private TextView tvDate;
    /**
     * 그리드뷰 어댑터
     */
    private GridAdapter gridAdapter;

    /**
     * 일 저장 할 리스트
     */
    private ArrayList<String> dayList;

    /**
     * 그리드뷰
     */
    private GridView gridView;

    /**
     * 캘린더 변수
     */
    private Calendar mCal;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_calendar);

        tvDate = (TextView)findViewById(R.id.tv_date);
        gridView = (GridView)findViewById(R.id.gridview);

        // 오늘에 날짜를 세팅 해준다.
        long now = System.currentTimeMillis();
        final Date date = new Date(now);
        //연,월,일을 따로 저장
        final SimpleDateFormat curYearFormat = new SimpleDateFormat("yyyy", Locale.KOREA);
        final SimpleDateFormat curMonthFormat = new SimpleDateFormat("MM", Locale.KOREA);
        final SimpleDateFormat curDayFormat = new SimpleDateFormat("dd", Locale.KOREA);

        //현재 날짜 텍스트뷰에 뿌려줌
        tvDate.setText(curYearFormat.format(date) + "/" + curMonthFormat.format(date));

        //gridview 요일 표시
        dayList = new ArrayList<String>();
        dayList.add("일");
        dayList.add("월");
        dayList.add("화");
        dayList.add("수");
        dayList.add("목");
        dayList.add("금");
        dayList.add("토");

        mCal = Calendar.getInstance();

        //이번달 1일 무슨요일인지 판단 mCal.set(Year,Month,Day)
        mCal.set(Integer.parseInt(curYearFormat.format(date)), Integer.parseInt(curMonthFormat.format(date)) - 1, 1);
        int dayNum = mCal.get(Calendar.DAY_OF_WEEK);
        //1일 - 요일 매칭 시키기 위해 공백 add
        for (int i = 1; i < dayNum; i++) {
            dayList.add("");
        }
        setCalendarDate(mCal.get(Calendar.MONTH) + 1);

        gridAdapter = new GridAdapter(getApplicationContext(), dayList);
        gridView.setAdapter(gridAdapter);

    }

    /**
     * 해당 월에 표시할 일 수 구함
     * 
     * @param month
     */
    private void setCalendarDate(int month) {
        mCal.set(Calendar.MONTH, month - 1);

        for (int i = 0; i < mCal.getActualMaximum(Calendar.DAY_OF_MONTH); i++) {
            dayList.add("" + (i + 1));
        }

    }

    /**
     * 그리드뷰 어댑터
     * 
     */
    private class GridAdapter extends BaseAdapter {

        private final List<String> list;

        private final LayoutInflater inflater;

        /**
         * 생성자
         * 
         * @param context
         * @param list
         */
        public GridAdapter(Context context, List<String> list) {
            this.list = list;
            this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public String getItem(int position) {
            return list.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            ViewHolder holder = null;

            if (convertView == null) {
                convertView = inflater.inflate(R.layout.item_calendar_gridview, parent, false);
                holder = new ViewHolder();

                holder.tvItemGridView = (TextView)convertView.findViewById(R.id.tv_item_gridview);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder)convertView.getTag();
            }
            holder.tvItemGridView.setText("" + getItem(position));

            //해당 날짜 텍스트 컬러,배경 변경
            mCal = Calendar.getInstance();
            //오늘 day 가져옴
            Integer today = mCal.get(Calendar.DAY_OF_MONTH);
            String sToday = String.valueOf(today);
            if (sToday.equals(getItem(position))) { //오늘 day 텍스트 컬러 변경
                holder.tvItemGridView.setTextColor(getResources().getColor(R.color.color_000000));
            }
            return convertView;
        }
    }

    private class ViewHolder {
        TextView tvItemGridView;
    }

}

 

[결과 화면]