Android uses chronometer to achieve Countdown function _android

The project needs to implement a timing function, although the use of chronometer can be very convenient to achieve the timing function, but need a countdown control.

Baidu has a number of methods, the countdown is not, so with chronometer encapsulated a countdown class, the spirit of open source, to share to everyone!

Nonsense don't say that go into the subject

First, the XML layout is as follows:

<com.example.anticlockwisedemo.anticlockwise 
 android:id= "@+id/id_timer" 
 android:layout_width= "Wrap_ Content " 
 android:layout_height=" wrap_content " 
 android:textsize=" 66sp "/> 

Inherit chronometer encapsulated classes:

Package Com.example.anticlockwisedemo; 
Import Java.text.SimpleDateFormat; 
Import Java.util.Date; 
Import Android.annotation.SuppressLint; 
Import Android.content.Context; 
Import Android.util.AttributeSet; 
 
 
Import Android.widget.Chronometer; /*** * * @author Small _ lazy 2015/02/07 * */@SuppressLint ({"Viewconstructor", "SimpleDateFormat"}) public Class A Ticlockwise extends Chronometer {public anticlockwise (context, AttributeSet attrs) {Super (context, attrs) 
 ; 
 TODO automatically generated constructor stub Mtimeformat = new SimpleDateFormat ("Mm:ss"); 
 This.setonchronometerticklistener (listener); 
 Private long mtime; 
 Private long mnexttime; 
 Private Ontimecompletelistener Mlistener; 
 
 Private SimpleDateFormat Mtimeformat; 
 
 Public Anticlockwise {Super (context); 
 /** * Restart timing/public void restart (long _time_s) {if (_time_s = = 1) {mnexttime = Mtime; 
 else {mtime = Mnexttime = _time_s; 
 } this.start (); }
 
 public void Restart () {Restart (-1); 
 /** * Continue to Timer/public void Onresume () {This.start (); 
 /** * Pause Timer/public void OnPause () {this.stop (); /** * Set Time format * * @param pattern * Timing Format/public void Settimeformat (String) {Mtimeformat = 
 New SimpleDateFormat (pattern); 
 public void Setontimecompletelistener (Ontimecompletelistener l) {mlistener = l; } Onchronometerticklistener Listener = new Onchronometerticklistener () {@Override public void Onchronometertick 
 (chronometer chronometer) 
 {if (mnexttime <= 0) {if (Mnexttime = = 0) {Anticlockwise.this.stop (); 
 if (null!= mlistener) mlistener.ontimecomplete (); 
 } mnexttime = 0; 
 Updatetimetext (); 
 Return 
 
 } mnexttime--; 
 Updatetimetext (); 
 
 } 
 }; 
 /** * Initialization time * @param _time_s/public void Inittime (long _time_s) {mtime = Mnexttime = _time_s; 
 Updatetimetext (); private void Updatetimetext () 
 {This.settext (Mtimeformat.format) (New Date (Mnexttime * 1000)); 
 } interface Ontimecompletelistener {void Ontimecomplete ();  } 
 
}

Effect Chart:

The procedure is very simple, I do not do too much explanation.

Detailed you can see the demo, has been encapsulated, can be used directly, download address: Http://xiazai.jb51.net/201611/yuanma/androidChronometer (jb51.net). rar

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