【移动应用开发技术】怎么在Android中实现一个日历控件

【移动应用开发技术】怎么在Android中实现一个日历控件

怎么在Android中实现一个日历控件？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。public

class

SelectDateDialog

{

private

static

final

String

TAG

=

"SelectDateDialog";

private

Dialog

dialog;

private

TextView

dateText;

private

int

selectYear,

selectMonth;

private

AppCompatActivity

mContext;

private

DateAdapter

adapter;

private

List<String>

selWeekList

=

new

ArrayList<>();

private

List<DateBean>

list

=

new

ArrayList<>();

public

SelectDateDialog

builder(AppCompatActivity

mContext,

int

year,

int

month)

{

this.mContext

=

mContext;

this.selectYear

=

year;

this.selectMonth

=

month;

//

获取Dialog布局

View

view

=

LayoutInflater.from(mContext).inflate(R.layout.dialog_date,

null);

//

定义Dialog布局和参数

dialog

=

new

Dialog(mContext,

R.style.AlertDialogStyle);

dialog.setCanceledOnTouchOutside(false);//点击外部是否取消

dialog.setCancelable(false);

dialog.setContentView(view);

Window

window

=

dialog.getWindow();

WindowManager.LayoutParams

params

=

window.getAttributes();

params.width

=

(ScreenUtils.getScreenWidth(mContext));

//

params.height

=

(int)

(ScreenUtils.getScreenHeight(mContext)

*

0.5);

window.setAttributes(params);

window.setGravity(Gravity.BOTTOM);

RecyclerView

recycler

=

view.findViewById(R.id.recycler_select_date);

dateText

=

view.findViewById(R.id.date_text);

dateText.setText(year

+

"年"

+

month

+

"月");

//下个月

view.findViewById(R.id.next_month).setOnClickListener(view13

->

{

if

(selectMonth

>

11)

{

selectYear

=

selectYear

+

1;

selectMonth

=

1;

}

else

{

selectMonth++;

}

showNewData(selectYear,

selectMonth);

});

//上个月

view.findViewById(R.id.last_month).setOnClickListener(view14

->

{

if

(selectMonth

<

2)

{

selectYear

=

selectYear

-

1;

selectMonth

=

12;

}

else

{

selectMonth--;

}

showNewData(selectYear,

selectMonth);

});

list

=

DataUtils.getCalendar(year,

month);

adapter

=

new

DateAdapter(mContext,

list);

GridLayoutManager

manager

=

new

GridLayoutManager(mContext,

7);

recycler.setLayoutManager(manager);

recycler.setAdapter(adapter);

//取消

view.findViewById(R.id.middle_cancel).setOnClickListener(view1

->

{

dialog.dismiss();

});

//确定

view.findViewById(R.id.middle_determine).setOnClickListener(view1

->

{

initSelect();

});

//设置选中当天

adapter.setNowDay(year,

month,

DataUtils.getLastMonth(year,

month));

return

this;

}

private

void

showNewData(int

year,

int

month)

{

list

=

DataUtils.getCalendar(year,

month);

//更新月数据

adapter.setList(list);

adapter.setNowDay(year

,

month,

DataUtils.getLastMonth(year,

month));

dateText.setText(year

+

"年"

+

month

+

"月");

}

/**

*

获取选中的日期

*/

private

void

initSelect()

{

selWeekList.clear();

for

(int

i

=

0;

i

<

list.size();

i++)

{

if

(list.get(i).isFlag())

{

//记录数量

selWeekList.add(selectYear

+

"-"

+

selectMonth

+

"-"

+

list.get(i).getWeek());

}

}

Log.e(TAG,

"initSelect:

"+

list.size());

Log.e(TAG,

"initSelect:

"+

selWeekList.size());

if

(selWeekList.size()

==

0)

{

Toast.makeText(mContext,

"未选则日期",

Toast.LENGTH_SHORT).show();

return;

}

dialog.dismiss();

listener.date(DataUtils.returnList(selWeekList));

Log.e(TAG,

"initSelect:

"

+

DataUtils.returnList(selWeekList));

}

public

void

show()

{

if

(dialog

!=

null

&&

(!dialog.isShowing()))

{

dialog.show();

}

}

private

OnDateListener

listener;

public

SelectDateDialog

setListener(OnDateListener

listener)

{

this.listener

=

listener;

return

this;

}

public

interface

OnDateListener

{

void

date(String

selectDate);

}

}ScreenUtils：public

class

ScreenUtils

{

public

static

int

getScreenWidth(Context

context)

{

DisplayMetrics

localDisplayMetrics

=

new

DisplayMetrics();

((Activity)

context).getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics);

return

localDisplayMetrics.widthPixels;

}

}DateBean：public

class

DateBean

{

private

int

week;

private

boolean

sign;

//0

上月

1本月

2下月

private

int

month;

private

boolean

isFlag;

public

boolean

isFlag()

{

return

isFlag;

}

public

void

setFlag(boolean

flag)

{

isFlag

=

flag;

}

public

int

getWeek()

{

return

week;

}

public

void

setWeek(int

week)

{

this.week

=

week;

}

public

boolean

isSign()

{

return

sign;

}

public

void

setSign(boolean

sign)

{

this.sign

=

sign;

}

public

int

getMonth()

{

return

month;

}

public

void

setMonth(int

month)

{

this.month

=

month;

}

public

DateBean(int

week,

boolean

sign,

int

month)

{

this.week

=

week;

this.sign

=

sign;

this.month

=

month;

}

}适配器：DateAdapterpublic

class

DateAdapter

extends

CommonRecyclerAdapter<DateBean>

{

private

static

final

String

TAG

=

"DateAdapter";

private

Integer

nowDay;

private

int

year;

private

int

month;

public

DateAdapter(Context

context,

List<DateBean>

list)

{

super(context,

R.layout.item_date,

list);

}

public

void

setNowDay(int

year,

int

month,

int

nowDay)

{

this.nowDay

=

nowDay;

this.year

=

year;

this.month

=

month;

notifyDataSetChanged();

}

@Override

public

void

convert(RecyclerHolder

holder,

DateBean

item,

int

position)

{

TextView

number

=

holder.getView(R.id.item_number);

number.setText(item.getWeek()

+

"");

//当前年月等于切换年月时才选中当天

if

(position

==

nowDay)

{

String

date

=

year

+

"-"

+

month;

if

(date.equals(DataUtils.timeInMillsTrasToDate(1)))

{

number.setBackgroundResource(R.drawable.date_unsel_shape);

number.setTextColor(Color.WHITE);

}else

{

number.setTextColor(Color.parseColor("#333333"));

}

}

else

{

number.setBackgroundResource(0);

number.setTextColor(Color.parseColor("#333333"));

if

(item.getMonth()

==

0

||

item.getMonth()

==

2)

{

number.setTextColor(Color.parseColor("#CDCDCD"));

}

else

{

number.setTextColor(Color.parseColor("#333333"));

}

}

//点击事件

number.setOnClickListener(view

->

{

//本月可以点击

int

nowYear

=

Integer.parseInt(DataUtils.timeInMillsTrasToDate(2));

int

nowMonth

=

Integer.parseInt(DataUtils.timeInMillsTrasToDate(3));

//只有在今天之后的日期才可以选中

if

(year

==

nowYear)

{

if

(item.getMonth()

==

1

&&

month

==

nowMonth

&&

position

>

nowDay)

{

onClick(item,

number);

}

else

if

(month

>

nowMonth)

{

onClick(item,

number);

}

}

else

if

(year

>

nowYear)

{

onClick(item,

number);

}

});

}

private

void

onClick(DateBean

item,

TextView

number)

{

if

(item.isFlag())

{

item.setFlag(false);

number.setBackgroundResource(0);

number.setTextColor(Color.parseColor("#333333"));

}

else

{

item.setFlag(true);

number.setBackgroundResource(R.drawable.date_sel_shape);

number.setTextColor(Color.WHITE);

}

}

}注意：CommonRecyclerAdapter之前写过，这里不再重复数据源：DataUtilspublic

class

DataUtils

{

private

static

final

String

TAG

=

"DataUtils";

/**

*

日历

*/

public

static

List<DateBean>

getCalendar(int

currentYear,

int

currentMonth)

{

//实例化集合

List<DateBean>

list

=

new

ArrayList<>();

Calendar

c

=

Calendar.getInstance();

c.clear();

/**

*

处理上个月月末

*/

if

(currentMonth

-

1

==

0)

{

c.set(Calendar.YEAR,

currentYear

-

1);

c.set(Calendar.MONTH,

11);

}

else

{

c.set(Calendar.YEAR,

currentYear);

c.set(Calendar.MONTH,

(currentMonth

-

2));

}

int

last_sumDays

=

c.getActualMaximum(Calendar.DAY_OF_MONTH);

c.set(Calendar.DATE,

last_sumDays);

//得到一号星期几

int

weekDay

=

c.get(Calendar.DAY_OF_WEEK);

if

(weekDay

<

7)

{

for

(int

i

=

weekDay

-

1;

i

>=

0;

i--)

{

Integer

date

=

new

Integer(last_sumDays

-

i);

list.add(new

DateBean(date,

true,

0));

}

}

/**

*

处理当前月

*/

c.clear();

c.set(Calendar.YEAR,

currentYear);

c.set(Calendar.MONTH,

currentMonth

-

1);

int

currentsumDays

=

c.getActualMaximum(Calendar.DAY_OF_MONTH);

for

(int

i

=

1;

i

<=

currentsumDays;

i++)

{

Integer

date

=

new

Integer(i);

list.add(new

DateBean(date,

true,

1));

}

/**

*

处理下个月月初

*/

c.clear();

if

(currentMonth

==

12)

{

c.set(Calendar.YEAR,

currentYear

+

1);

c.set(Calendar.MONTH,

0);

}

else

{

c.set(Calendar.YEAR,

currentYear);

c.set(Calendar.MONTH,

currentMonth);

}

c.set(Calendar.DATE,

1);

int

currentWeekDay

=

c.get(Calendar.DAY_OF_WEEK);

if

(currentWeekDay

>

2

&&

currentWeekDay

<

8)

{

for

(int

i

=

1;

i

<=

8

-

currentWeekDay;

i++)

{

list.add(new

DateBean(i,

true,

2));

}

}

return

list;

}

/**

*

获取上个月大小

*/

public

static

Integer

getLastMonth(int

currentYear,

int

currentMonth)

{

//实例化集合

List<Integer>

list

=

new

ArrayList<>();

Calendar

c

=

Calendar.getInstance();

c.clear();

/**

*

处理上个月月末

*/

if

(currentMonth

-

1

==

0)

{

c.set(Calendar.YEAR,

currentYear

-

1);

c.set(Calendar.MONTH,

11);

}

else

{

c.set(Calendar.YEAR,

currentYear);

c.set(Calendar.MONTH,

(currentMonth

-

2));

}

int

last_sumDays

=

c.getActualMaximum(Calendar.DAY_OF_MONTH);

c.set(Calendar.DATE,

last_sumDays);

//得到一号星期几

int

weekDay

=

c.get(Calendar.DAY_OF_WEEK);

if

(weekDay

<

7)

{

for

(int

i

=

weekDay

-

1;

i

>=

0;

i--)

{

list.add(i);

}

}

Log.e(TAG,

"getLastMonth:

"

+

Integer.parseInt(timeInMillsTrasToDate(0)));

return

list.size()

+

Integer.parseInt(timeInMillsTrasToDate(0))

-

1;

}

/**

*

list转string字符串

*/

public

static

String

returnList(List<String>

list)

{

if

(null

==

list

&&

list.size()

==

0)

{

return

"";

}

else

{

//去除空格

String

str

=

String.valueOf(list).replaceAll("

",

"");

return

str.substring(1,

str.length()

-

1);

}

}

/**

*

时间转换

*/

@TargetApi(Build.VERSION_CODES.N)

public

static

String

timeInMillsTrasToDate(int

formatType)

{

DateFormat

formatter

=

null;

switch

(formatType)

{

case

0:

formatter

=

new

SimpleDateFormat("dd");

break;

case

1:

formatter

=

new

SimpleDateFormat("yyyy-MM");

break;

case

2:

formatter

=

new

SimpleDateFormat("yyyy");

break;

case

3:

formatter

=

new

SimpleDateFormat("MM");

break;

}

Calendar

calendar

=

Calendar.getInstance();

return

formatter.format(calendar.getTime());

}

}使用：DateActivitypublic

class

DateActivity

extends

AppCompatActivity

{

private

Button

openDate;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_date);

openDate

=

this.findViewById(R.id.open_date);

openDate.setOnClickListener(view

->

{

showDateDialog();

});

}

private

void

showDateDialog()

{

int

year

=

Integer.parseInt(DataUtils.timeInMillsTrasToDate(2));

int

month

=

Integer.parseInt(DataUtils.timeInMillsTrasToDate(3));

new

SelectDateDialog().builder(this,

year,

month)

.setListener(selectDate

->

openDate.setText(selectDate)).show();

}

}对应布局：activity_date<?xml

version="1.0"

encoding="utf-8"?>

<LinearLayout

xmlns:android="/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

<Button

android:id="@+id/open_date"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="打开日历"

/>

</LinearLayout>2、资源文件：date_sel_shape.xml<?xml

version="1.0"

encoding="utf-8"?>

<shape

xmlns:android="/apk/res/android"

android:shape="oval"

android:useLevel="false">

<solid

android:color="@color/colorAccent"

/>

<!--<stroke

android:width="1dp"

android:color="@color/white"/>-->

<size

android:width="30dp"

android:height="30dp"

/>

</shape>date_unsel_shape.xml<?xml

version="1.0"

encoding="utf-8"?>

<shape

xmlns:android="/apk/res/android"

android:shape="oval"

android:useLevel="false">

<solid

android:color="@color/colorPrimary"

/>

<!--<stroke

android:width="1dp"

android:color="@color/white"/>-->

<size

android:w