Timer usage-countdown-timer

Countdown:

Main. xml:

 

<? XML version = "1.0" encoding = "UTF-8"?>

<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"

Android: Orientation = "vertical"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

>

<Textview Android: Id = "@ + ID/countdowntime"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: text = "@ string/Hello"/>

</Linearlayout>

 

Certificate -------------------------------------------------------------------------------------------------------------------------------------------

 

Countdowntime. Java:

 

Package demo. countdowntime;

 

Import java. util. timer;

Import java. util. timertask;

 

Import Android. App. activity;

Import Android. OS. Bundle;

Import Android. OS. Handler;

Import Android. OS. message;

Import Android. widget. textview;

 

Public class countdowntime extends activity {

Timer timer;

Int reclen = 50;

Textview rectime;

Public void oncreate (bundle savedinstancestate ){

Super. oncreate (savedinstancestate );

Setcontentview (R. layout. Main );

Coutdowntime ();

}

 

Private void coutdowntime (){

Rectime = (textview) findviewbyid (R. Id. countdowntime );

Timer = new timer (true );

Timer. Schedule (task, 1000,100 0); // The task is executed after a delay of MS, and once a delay of MS

}

 

Timertask task = new timertask (){

Public void run (){

Message message = new message ();

Message. What = 1;

For (; reclen> 0; reclen --){

Handler. sendmessage (Message );

}

}

};

 

Final handler = new handler (){

Public void handlemessage (Message MSG ){

Switch (msg. What ){

Case 1:

Rectime. settext (string. valueof (reclen ));

Break;

}

Super. handlemessage (MSG );

}

};

}

========================================================== ==========================================================

Timer :( see: http://www.cnblogs.com/xzf158/archive/2009/09/04/1560042.html)

Main. xml:

 

<? XML version = "1.0" encoding = "UTF-8"?>

<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"

Android: Orientation = "vertical"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

>

 

<Textview Android: text = "time"

Android: Id = "@ + ID/time"

Android: layout_width = "wrap_content"

Android: layout_height = "wrap_content"/>

 

</Linearlayout>

Bytes ------------------------------------------------------------------------------------------------------------------------

Timer. Java:

 

Package demo. timer;

 

Import java. util. timer;

Import java. util. timertask;

Import Android. App. activity;

Import Android. OS. Bundle;

Import Android. OS. Handler;

Import Android. OS. message;

Import Android. widget. textview;

 

Public class timer extends activity {

Timer timer;

Int reclen;

Textview rectime;

 

Public void oncreate (bundle savedinstancestate ){

Super. oncreate (savedinstancestate );

Setcontentview (R. layout. Main );

Timer ();

}

 

Private void timer (){

Rectime = (textview) findviewbyid (R. Id. time );

Timer = new timer (true );

Timer. Schedule (task, 1000,100 0); // The task is executed after a delay of MS, and once a delay of MS

}

 

Timertask task = new timertask (){

Public void run (){

Message message = new message ();

Message. What = 1;

Handler. sendmessage (Message );

}

};

 

Handler handler = new handler (){

Public void handlemessage (Message MSG ){

Switch (msg. What ){

Case 1:

Reclen ++;

Rectime. settext (string. valueof (reclen ));

Break;

}

Super. handlemessage (MSG );

}

};

}