Android day 10-use handler to implement the SS component

 

Main. xml

<? XML version = "1.0" encoding = "UTF-8"?>
<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: Orientation = "vertical">

<Textview
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: text = "@ string/Hello"/>

<Progressbar
Android: Id = "@ + ID/Bar"
Style = "? Android: ATTR/progressbarstylehorizontal"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: visibility = "gone"
/>

<Button
Android: Id = "@ + ID/startbutton"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: text = "button"

/>
</Linearlayout>

 

Progresshandleractivity. Java

Package CN. class3g. activity;

Import Android. App. activity;
Import Android. OS. Bundle;
Import Android. OS. Handler;
Import Android. OS. message;
Import Android. util. log;
Import Android. View. view;
Import Android. View. View. onclicklistener;
Import Android. widget. Button;
Import Android. widget. progressbar;

Public class progresshandleractivity extends activity {

Private progressbar;
Private button startbutton;
 
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );

Bar = (progressbar) This. findviewbyid (R. Id. bar );

Startbutton = (button) This. findviewbyid (R. Id. startbutton );

Startbutton. setonclicklistener (New buttonlistener ());

}



Class buttonlistener implements onclicklistener {

Public void onclick (view v ){

Bar. setvisibility (view. Visible );

Updatebarhandler. Post (updatethread );

}


}


Handler updatebarhandler = new handler (){

Public void handlemessage (Message MSG ){

Bar. setprogress (msg. arg1 );

Updatebarhandler. Post (updatethread );


}



};
 
 
Runnable updatethread = new runnable (){

Int I = 0;
Public void run (){

// Log. I ("tag", "begin thread ");

I = I + 10;

Message MSG = updatebarhandler. obtainmessage ();

MSG. arg1 = I;

Try {
Thread. Sleep (1000 );
} Catch (interruptedexception e ){

E. printstacktrace ();
}


Updatebarhandler. sendmessage (MSG );

If (I = 100 ){


Updatebarhandler. removecallbacks (updatethread );

}


}

};
 
 
 
 
 
}