Android 纵向双选日历

这个日历的布局分两部分，一部分是显示星期几的LinearLayout，另外就是一个RecyclerView，负责纵向滚动了。

工具类：

implementation 'com.blankj:utilcode:1.17.3'

上activity_calendar代码：

<?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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="5dp"
            android:text="日" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="5dp"
            android:text="一" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="5dp"
            android:text="二" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="5dp"
            android:text="三" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="5dp"
            android:text="四" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="5dp"
            android:text="五" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="5dp"
            android:text="六" />

    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:overScrollMode="never" />
</LinearLayout>

接下来是CalendarActivity

1. 计算数据
2. 可以扩展日历的点击事件和范围选择事件

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.blankj.utilcode.constant.TimeConstants;
import com.blankj.utilcode.util.TimeUtils;

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

public class CalendarActivity extends AppCompatActivity {


    private RecyclerView recyclerView;

    private CalendarRangeAdapter calendarRangeAdapter;

    /**
     * 最大月份数
     */
    private int maxMonth = 12;

    private List<DateBean> dateList = new ArrayList<>();

    private List<DateBean> allDateList = new ArrayList<>();


    private Handler handler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
            initView();
            super.handleMessage(msg);
        }
    };

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calendar);

        recyclerView = findViewById(R.id.recycler_view);

        new Thread() {
            @Override
            public void run() {
                initData();
            }

            ;
        }.start();

    }

    private void initView() {
        GridLayoutManager manager = new GridLayoutManager(CalendarActivity.this, 7);
        manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                return allDateList.get(position).getType() == 0 ? 7 : 1;
            }
        });
        recyclerView.setLayoutManager(manager);
        calendarRangeAdapter = new CalendarRangeAdapter(CalendarActivity.this, allDateList);
        recyclerView.setAdapter(calendarRangeAdapter);
        calendarRangeAdapter.setOnItemSelect(new CalendarRangeAdapter.OnItemSelect() {
            @Override
            public void onItemClick(int position) {

            }


            @Override
            public void onItemRangeSelect(String startDate, String endDate) {
                System.out.println(startDate + "~" + endDate);
            }
        });
    }

    private void initData() {
        for (int i = 0; i < maxMonth; i++) {
            Calendar calendar = Calendar.getInstance();
            calendar.add(Calendar.MONTH, i);

            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH) + 1;

            int maxDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);

            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.CHINA);
            String dateString = simpleDateFormat.format(calendar.getTime());

            DateBean monthBean = new DateBean();
            monthBean.setDate(dateString.substring(0, 7));
            monthBean.setCanSelect(false);
            monthBean.setType(0);

            dateList.clear();
            dateList.add(monthBean);

            calendar.set(Calendar.DAY_OF_MONTH, 1);

            //当月第一天是周几 0是周日，1是周一 以此类推
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
            //填充1号前面的空白
            for (int j = 0; j < dayOfWeek - 1; j++) {
                DateBean dateBean = new DateBean();
                dateBean.setCanSelect(false);
                dateBean.setType(1);
                dateBean.setDate("");
                dateList.add(dateBean);
            }

            for (int j = 0; j < maxDays; j++) {
                DateBean dateBean = new DateBean();
                dateBean.setType(1);
                dateBean.setCenterString(String.valueOf(j + 1));
                dateBean.setSelect(true);
                dateBean.setDate(year + "-" + addZero(month) + "-" + addZero(j + 1));
                //今天之前不可选中
                if (TimeUtils.getTimeSpanByNow(dateBean.getDate()
                        , new SimpleDateFormat("yyyy-MM-dd", Locale.CHINA)
                        , TimeConstants.DAY) < 0) {
                    dateBean.setCenterString(String.valueOf(j + 1));
                    dateBean.setCanSelect(false);
                } else {
                    if (TimeUtils.getTimeSpanByNow(dateBean.getDate()
                            , new SimpleDateFormat("yyyy-MM-dd", Locale.CHINA)
                            , TimeConstants.DAY) > 0) {
                        dateBean.setCenterString(String.valueOf(j + 1));
                    } else {
                        dateBean.setCenterString("今天");
                    }
                    dateBean.setCanSelect(true);
                }
                dateList.add(dateBean);
            }

            allDateList.addAll(dateList);
        }

        Message msg = handler.obtainMessage();
        handler.sendMessage(msg);

    }

    private String addZero(int text) {
        if (text < 10) {
            return "0" + text;
        } else {
            return "" + text;
        }
    }
}

上CalendarRangeAdapter代码（根据bean属性操作）：

1. 根据类型，填充月布局和日布局。
2. 包含点击、范围选择的方法

public class CalendarRangeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private Context context;

    private List<DateBean> list;

    private int[] selectRange = new int[2];


    private final int TYPE_MONTH = 0;
    private final int TYPE_DAY = 1;

    public CalendarRangeAdapter(Context context, List<DateBean> list) {
        this.context = context;
        this.list = list;
        initSelect();
    }

    public void initSelect() {
        clearSelect();
    }


    public void clearSelect() {
        for (int i = 0; i < list.size(); i++) {
            list.get(i).setSelect(false);
            list.get(i).setSelectRange(false);
            list.get(i).setBottomString("");
        }

        selectRange[0] = -1;
        selectRange[1] = -1;

    }

    public void notifySelect() {
        notifyDataSetChanged();
    }


    public void setData(List<DateBean> list) {
        this.list = list;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        RecyclerView.ViewHolder holder = null;
        if (viewType == 0) {
            //月份
            View view = LayoutInflater.from(context).inflate(R.layout.item_month,
                    parent, false);
            holder = new MonthViewHolder(view);
        } else {
            //日期
            View view = LayoutInflater.from(context).inflate(R.layout.item_day,
                    parent, false);
            holder = new DayViewHolder(view);
        }
        return holder;
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

        final int fPosition = holder.getAdapterPosition();
        if (holder instanceof MonthViewHolder) {
            ((MonthViewHolder) holder).tvMonth.setText(list.get(position).getDate().replace("-", "年") + "月");
        } else {
            final DayViewHolder viewHolder = (DayViewHolder) holder;

            viewHolder.tvCenter.setText(list.get(fPosition).getCenterString());
            viewHolder.tvBottom.setText(list.get(fPosition).getBottomString());
            if (viewHolder.llDay.getTag() instanceof View.OnClickListener){
                viewHolder.llDay.setOnClickListener( null);
            }
            if (list.get(fPosition).isCanSelect()) {
                //今天之前（不可选）
                if (TimeUtils.getTimeSpanByNow(list.get(position).getDate()
                        , new SimpleDateFormat("yyyy-MM-dd", Locale.CHINA)
                        , TimeConstants.DAY) < 0) {
                    viewHolder.tvCenter.setTextColor(
                            ContextCompat.getColor(context, R.color.color_calendar_can_not_select));
                } else {
                    if (TimeUtils.getTimeSpanByNow(list.get(position).getDate()
                            , new SimpleDateFormat("yyyy-MM-dd", Locale.CHINA)
                            , TimeConstants.DAY) > 0) {
                        viewHolder.tvCenter.setTextColor(
                                ContextCompat.getColor(context, R.color.color_calendar_can_select));
                    } else {
                        viewHolder.tvCenter.setTextColor(
                                ContextCompat.getColor(context, R.color.color_calendar_today));
                    }
                    if (list.get(fPosition).isSelect()) {
                        viewHolder.llDay.setBackgroundColor(
                                ContextCompat.getColor(context, R.color.color_calendar_background_select));
                        viewHolder.tvCenter.setTextColor(
                                ContextCompat.getColor(context, R.color.color_calendar_select));
                        viewHolder.tvBottom.setTextColor(
                                ContextCompat.getColor(context, R.color.color_calendar_select));
                    } else if (list.get(fPosition).isSelectRange()) {
                        viewHolder.llDay.setBackgroundColor(
                                ContextCompat.getColor(context, R.color.color_calendar_background_select_range));
                        viewHolder.tvCenter.setTextColor(
                                ContextCompat.getColor(context, R.color.color_calendar_select));
                        viewHolder.tvBottom.setTextColor(
                                ContextCompat.getColor(context, R.color.color_calendar_select));
                    } else {
                        viewHolder.llDay.setBackgroundColor(
                                ContextCompat.getColor(context, R.color.color_calendar_background_normal));
                    }


                    if (onItemSelect != null) {
             
                     View.OnClickListener clickListener =    new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                if (selectRange[0] == -1 && selectRange[1] == -1) {
                                    selectRange[0] = fPosition;
                                    list.get(fPosition).setSelect(true);
                                    list.get(fPosition).setBottomString("开始");
                                    onItemSelect.onItemClick(fPosition);
                                    notifyDataSetChanged();

                                } else if (selectRange[0] != -1 && selectRange[1] == -1) {
                                    onItemSelect.onItemClick(fPosition);
                                    if (fPosition < selectRange[0]) {
                                        clearSelect();
                                        selectRange[0] = fPosition;
                                        list.get(fPosition).setSelect(true);
                                        list.get(fPosition).setBottomString("开始");
                                    } else if (fPosition > selectRange[0]) {
                                        selectRange[1] = fPosition;
                                        list.get(fPosition).setSelect(true);
                                        list.get(fPosition).setBottomString("结束");
                                        for (int i = selectRange[0] + 1; i < selectRange[1]; i++) {
                                            list.get(i).setSelectRange(true);
                                            list.get(i).setBottomString("");
                                        }
                                        onItemSelect.onItemRangeSelect(list.get(selectRange[0]).getDate(), list.get(selectRange[1]).getDate());
                                    } else {
                                        clearSelect();
                                    }
                                    notifyDataSetChanged();
                                } else {
                                    clearSelect();
                                    selectRange[0] = fPosition;
                                    list.get(fPosition).setSelect(true);
                                    list.get(fPosition).setBottomString("开始");
                                    onItemSelect.onItemClick(fPosition);
                                    notifyDataSetChanged();
                                }
                            }
                        };
                        viewHolder.llDay.setOnClickListener(clickListener);
                        viewHolder.llDay.setTag(clickListener);
                    }

                }

            } else {
                viewHolder.llDay.setBackgroundColor(ContextCompat.getColor(context, R.color.color_calendar_background_normal));
                viewHolder.tvCenter.setTextColor(ContextCompat.getColor(context, R.color.color_calendar_can_not_select));
            }
        }
    }

    public OnItemSelect onItemSelect;


    public void setOnItemSelect(OnItemSelect onItemSelect) {
        this.onItemSelect = onItemSelect;
    }

    public interface OnItemSelect {
        void onItemClick(int position);

        void onItemRangeSelect(String startDate, String endDate);
    }

    @Override
    public int getItemViewType(int position) {

        return list.get(position).getType() == 0 ? TYPE_MONTH : TYPE_DAY;
    }

    @Override
    public int getItemCount() {
        return list == null ? 0 : list.size();
    }


    class MonthViewHolder extends RecyclerView.ViewHolder {
        TextView tvMonth;

        public MonthViewHolder(View itemView) {
            super(itemView);
            tvMonth = itemView.findViewById(R.id.tv_month);
        }
    }

    class DayViewHolder extends RecyclerView.ViewHolder {
        LinearLayout llDay;
        TextView tvCenter;
        TextView tvBottom;

        public DayViewHolder(View itemView) {
            super(itemView);
            llDay = itemView.findViewById(R.id.ll_day);
            tvCenter = itemView.findViewById(R.id.tv_center);
            tvBottom = itemView.findViewById(R.id.tv_bottom);
        }
    }
}

DateBean代码（中间文字，底部文字，是否可选等属性）：

public class DateBean {

    /**
     * 日期
     */
    private String date;
    /**
     * 底部文字
     */
    private String bottomString;
    /**
     * 中间文字
     */
    private String centerString;

    /**
     * 是否可以选择
     */
    private boolean canSelect;
    /**
     * 是否选中
     */
    private boolean isSelect;

    /**是否在选中范围*/
    private boolean isSelectRange;
    /**
     * item type 0月份 1日期
     */
    private int type;


    public String getDate() {
        return date == null ? "" : date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getCenterString() {
        return centerString == null ? "" : centerString;
    }

    public void setCenterString(String centerString) {
        this.centerString = centerString;
    }

    public boolean isCanSelect() {
        return canSelect;
    }

    public void setCanSelect(boolean canSelect) {
        this.canSelect = canSelect;
    }

    public boolean isSelect() {
        return isSelect;
    }

    public void setSelect(boolean select) {
        isSelect = select;
    }

    public boolean isSelectRange() {
        return isSelectRange;
    }

    public void setSelectRange(boolean selectRange) {
        isSelectRange = selectRange;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    public String getBottomString() {
        return bottomString == null ? "" : bottomString;
    }

    public void setBottomString(String bottomString) {
        this.bottomString = bottomString;
    }
}

上color.xml（可以自己换）：

<resources>
    <color name="color_calendar_can_not_select">#dedede</color>
    <color name="color_calendar_can_select">#505050</color>
    <color name="color_calendar_select">#ffffff</color>
    <color name="color_calendar_today">#F67332</color>
    <color name="color_calendar_background_select">#F3BE30</color>
    <color name="color_calendar_background_select_range">#7DF3BE30</color>
    <color name="color_calendar_background_normal">#00000000</color>
</resources>

OK，完毕！