Android Interface Programming--Date Time component (V)

Android Interface Programming--Date Time component
2.6 Date Time component 2.6.1 Textclock

Displays the system date and time as text, customizable display format, and is a new feature provided by Android4.2 ( corresponding to API level 17).

There are two ways to format Textclock:

1. In the hour mode:

Property:Android:format24hour

Method:Set Format24hour (charsequence)

2. In the hour mode:

Property:Android:format12hour

Method:Set Format12hour (charsequence)

The following is a case 2.6-1, explaining The use of textclock, the implementation of the effect 2.6-1

Figure 2.6-1

2.6.2 AnalogClock

The AnalogClock control displays the analog clock . It inherits the view component and overrides the OnDraw method on the basis of the view component , in onDraw The method implements the drawing of the analog clock, but draws the hour and minute hands without the second hand.

Table 2.6-1 lists the XML attributes supported by AnalogClock .

Table 2.6-1analogclock supported XML attribute descriptions

XML Properties	Note
Android:dial	Set up a picture of the use of the analogue dial
Android:hand_hour	Set the picture to be used when simulating the dial hour
Android:hand_minute	Set up a picture of the analog dial minute hand

The following is a case 2.6-2, explaining The basic usage of anlogclock, the implementation of the effect 2.6-2

Figure 2.6-2

2.6.3 DatePicker and timepicker

DatePicker and timepicker are Android -provided controls for selecting a time and selecting a date.

They are all inherited from framelayout, and they are relatively simple to use.

Using the DatePicker and timepicker controls helps ensure that a user chooses a time or date that is valid and formatted correctly.

Timepicker is used to select each part of the time (hours, minutes, mornings / afternoons).

DatePicker is used to select each part of the date (month, day, year).

2.6-3 as shown:

Figure 2.6-3

Table 2.6-2 lists the XML attributes supported by DatePicker .

Table 2.6-2 XML attribute Descriptions supported by DatePicker

XML Properties	Note
Android:calendarviewshown	Whether to display the calendarview component
Android:spinnersshown	Whether to display the Spinner component
Android:endyear	Whether to allow the last year to be selected
Android:startyear	Whether to allow selection of the first year
Android:maxdate	Displays the maximum date for this calendar view in mm/dd/yyyy format
Android:mindate	Displays the minimum date for this calendar view in mm/dd/yyyy format

The following is a case 2.6-3, explaining the basic usage of anlogclock , the implementation of the effect 2.6-3

 

Figure 2.6-3

public class Pickeractivity extends appcompatactivity {private int year;    private int month;    private int day;    private int hour;    private int minute;    Private DatePicker DatePicker;    Private Timepicker Timepicker;  @OverridedatePicker. Init (year, month, day, new Datepicker.ondatechangedlistener () {@Override public                void Ondatechanged (DatePicker arg0, int year, int month, Int. day) {PickerActivity.this.year = year; PickerActivity.this.month = month;                PickerActivity.this.day = day;            Displays the current time and date showdate (year, month, day, hour, minute);        }        }); Specifies event listener Timepicker.setontimechangedlistener (new Timepicker.ontimechangedlistener () {@Ove for Timerpicker Rride public void ontimechanged (Timepicker arg0, int hour, int minute) {PickerActivity.this.hou                R = Hour;            PickerActivity.this.minute = minute;        }        }); Showdate (yEar,month,day,hour,minute); } protected void Showdate (int year, Int. month, int day, int hour,int minute) {EditText text = (EditText) findvi        Ewbyid (r.id.etshowdate);    Text.settext ("Selected date and Time:" + year + "years" + (month+1) + "Month" + Day + "days" + hour + "+ minute+"); }}

2.6.5 CalendarView

is a calendar component that is used to display and select dates. The range supported by the calendar is configurable. The user can select a date, or you can select the desired date by touching scroll.

Table 2.6-3 lists the XML attributes supported by CalendarView .

Table 2.6-3 XML attribute Descriptions supported by CalendarView

XML Properties	Method	Note
Android:datetextappearance	Setdatetextappearance (INT)	Set the style of the Calendar control date text
Android:maxdate	Setmaxdate (Long)	The minimum date displayed in this calendar view in mm/dd/yyyy format
Android:mindate	Setmindate (Long)	The maximum date displayed in this calendar view in mm/dd/yyyy format
Android:firstdayofweek	Setfirstdayofweek(INT)	Set the first day of the week for the calendar
Android:shownweekcount	Set Shownweekcount (INT)	Set the calendar to show a total of several weeks
Android:selectedweekbackgroundcolor	Setselectedweekbackgroundcolor (INT)	Sets the background color of the selected week
Android:focusedmonthdatecolor	Setfocusedmonthdatecolor	Sets the color of the text for the focus month
Android:weekseparatorlinecolor	Setweekseparatorlinecolor (INT)	Set the color of the week split line
Android:unfocusedmonthdatecolor	Setunfocusedmonthdatecolor (INT)	Sets the color of text for unselected months

The following is a case 2.6-4, explaining the basic usage of calendarview, the implementation of the effect 2.6-4.

Figure 2.6-4

public class Calendarviewactivity extends Appcompatactivity {private CalendarView CV;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_calendar_view);        cv= (CalendarView) Findviewbyid (R.id.calenddarview);    Initcalendarview (); The private void Initcalendarview () {//Adds event listener Cv.setondatechangelistener for the CalendarView component's date Change event (new Calenda Rview.ondatechangelistener () {@Override public void Onselecteddaychange (CalendarView view, int year                , int month, int dayofmonth) {//Use Toast to display the date selected by the user                        Toast.maketext (Calendarviewactivity.this, "Ticket purchase Date:" + year + "years" + month + "Month" + DayOfMonth + "Day"            , Toast.length_short). Show ();    }        }); }}

Case Key points:

Get the date selected by the user by setting the date listener Ondatechangelistener for the CalendarView object and the replication callback method Onselecteddaychange ()

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Android Interface Programming--Date Time component (V)