GridCellAdapter 대신에 RecyclerView 기반 CalendarAdapter를 만들면 어떤 사항들이 변경되는지 알아보자.
RecyclerView 는 ListView 보다 메모리, 성능이 개선된 것으로 데이터 양이 많은 경우 스크롤을 효율적으로 수행할 수 있는 위젯이다.
앱 build.gradle 수정사항
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.recyclerview:recyclerview:1.0.0'
implementation 'androidx.cardview:cardview:1.0.0'
implementation 'gun0912.ted:tedpermission:2.0.0'
implementation 'androidx.multidex:multidex:2.0.0' // minSdkVersion 이 21 이하인 경우 사용
implementation files('libs/icu4j-4_8_2.jar')
}
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activity_main.xml
<GridView
android:id="@+id/calendar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scrollbars="horizontal"
android:numColumns="7" >
</GridView>
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<androidx.recyclerview.widget.RecyclerView
android:id="@+id/calendar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerVertical="true"
android:adjustViewBounds="false"
android:focusableInTouchMode="true"
android:scrollbars="vertical" />
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MainActivity.java
private GridView calendarView;
private GridCellAdapter adapter;
calendarView = (GridView) this.findViewById(R.id.calendar);
makeCalendarList(month, year);
// Initialised
adapter = new GridCellAdapter(mContext, calList);
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
}
private void setGridCellAdapterToDate(int month, int year) {
makeCalendarList(month, year);
adapter = new GridCellAdapter(mContext, calList);
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
// 상단 화면 날짜 출력
cal.set(year, month -1, cal.get(Calendar.DAY_OF_MONTH));
currentMonth.setText(DateFormat.format(dateTemplate, cal.getTime()));
}
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private RecyclerView calendarView;
private RecyclerView.Adapter adapter;
calendarView = this.findViewById(R.id.calendar);
calendarView.setHasFixedSize(true);
calendarView.setLayoutManager(new GridLayoutManager(mContext,7));
makeCalendarList(month, year);
// Initialised
adapter = new CalendarAdapter(mContext, calList);
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
}
private void setGridCellAdapterToDate(int month, int year) {
makeCalendarList(month, year);
adapter = new CalendarAdapter(mContext, calList);
adapter.notifyDataSetChanged();
calendarView.setAdapter(adapter);
// 상단 화면 날짜 출력
cal.set(year, month -1, cal.get(Calendar.DAY_OF_MONTH));
currentMonth.setText(DateFormat.format(dateTemplate, cal.getTime()));
}
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이제 CalendarAdapter 만드는 방법이다.
public class CalendarAdapter extends RecyclerView.Adapter<CalendarAdapter.CustomViewHolder> {
@NonNull
@Override
public CalendarAdapter.CustomViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return null;
}
@Override
public void onBindViewHolder(@NonNull CalendarAdapter.CustomViewHolder holder, int position) {
}
@Override
public int getItemCount() {
return 0;
}
public class CustomViewHolder extends RecyclerView.ViewHolder {
public CustomViewHolder(@NonNull View itemView) {
super(itemView);
}
}
} |
아래 이미지와 같은 과정을 거치면 위와 같은 코드가 만들어진다.
이제 완성된 코드를 적는다.
package com.link2me.android.adpater;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.link2me.android.calendar.R;
import com.link2me.android.item.Calendar_Item;
import com.link2me.android.util.CalendarHelper;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
public class CalendarAdapter extends RecyclerView.Adapter<CalendarAdapter.CustomViewHolder> {
static final String tag = CalendarAdapter.class.getSimpleName();
Context mContext;
private LinkedHashMap<String, Calendar_Item> calList;
private String[] mKeys;
private final SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyyMMdd");
public CalendarAdapter(Context context, LinkedHashMap<String, Calendar_Item> list) {
mContext = context;
calList = list;
mKeys = calList.keySet().toArray(new String[list.size()]);
}
@NonNull
@Override
public CalendarAdapter.CustomViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.calendar_cell, parent, false);
CustomViewHolder holder = new CustomViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull final CalendarAdapter.CustomViewHolder holder, int position) {
String theday = calList.get(mKeys[position]).getDay();
String themonth = calList.get(mKeys[position]).getMonth();
String theyear = calList.get(mKeys[position]).getYear();
String holiday = calList.get(mKeys[position]).getEvent();
holder.gridcell_Day.setText(theday);
holder.gridcell_LunarDay.setText(CalendarHelper.Sol2Lun(theyear, String.valueOf(Integer.parseInt(themonth)-1),theday)); //0 ~ 11월로 인식하므로 - 1
if(holiday.length()>0){
holder.gridcell_Event.setText(holiday);
} else {
holder.gridcell_Event.setText("");
}
holder.gridcell_layout.setTag(theday + "-" + themonth + "-" + theyear);
if(calList.get(mKeys[position]).getColor().equals("GRAY")){
holder.gridcell_Day.setTextColor(Color.LTGRAY);
}
if(calList.get(mKeys[position]).getColor().equals("BLACK")){
holder.gridcell_Day.setTextColor(Color.BLACK);
}
if(calList.get(mKeys[position]).getColor().equals("RED")){
holder.gridcell_Day.setTextColor(Color.RED);
holder.gridcell_Event.setTextColor(Color.RED);
}
if(calList.get(mKeys[position]).getColor().equals("BLUE")){
holder.gridcell_Day.setTextColor(Color.BLUE);
}
if(calList.get(mKeys[position]).getColor().equals("CYAN")){
holder.gridcell_layout.setBackgroundColor(Color.CYAN);
}
String tagData = theyear+themonth+theday;
holder.itemView.setTag(tagData);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String date_month_year = (String) view.getTag();
Log.e("Selected date", date_month_year);
try {
Date parsedDate = dateFormatter.parse(date_month_year);
Log.d(tag, "Parsed Date: " + parsedDate.toString());
} catch (ParseException e) {
e.printStackTrace();
}
}
});
}
@Override
public int getItemCount() {
return calList.size();
}
public class CustomViewHolder extends RecyclerView.ViewHolder {
protected LinearLayout gridcell_layout;
protected TextView gridcell_Day;
protected TextView gridcell_LunarDay;
protected TextView gridcell_Event;
public CustomViewHolder(@NonNull View itemView) {
super(itemView);
gridcell_layout = (LinearLayout) itemView.findViewById(R.id.calendar_day_gridcell);
gridcell_Day = itemView.findViewById(R.id.dayTV);
gridcell_LunarDay = itemView.findViewById(R.id.lunardayTV);
gridcell_Event = itemView.findViewById(R.id.eventTV);
}
}
} |
커스텀 달력 만드는 방법에 대한 충분한 설명이 되었을 것이라고 본다.
https://www.youtube.com/watch?v=kNq9w1_nhL4 를 강좌를 보면 RecyclerView 에 대한 설명을 잘 해주고 있으니 사용법에 대해 잘 모르면 보면 도움될 수 있다.
