Android Hands-on tutorial 40th chronometer implementation Countdown _android

Android provides an API for timing by seconds, and today is a simple countdown to this API.

To make a layout:

<?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 " > <chronometer android:id= "@+id/mychronometer" android:layout_width= "Wrap_content" Wrap_content "/> <linearlayout android:layout_width=" wrap_content "android:layout_height=" an 
  droid:orientation= "Horizontal" > <button android:id= "@+id/btnstart" android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:text= "Start Timer"/> <button android:id= "@+id/btnstop" Android: Layout_width= "Wrap_content" android:layout_height= "wrap_content" android:text= "Stop"/> <Button  
 
 D= "@+id/btnbase" android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "reset"/> <button android:id= "@+id/bTnformat "android:layout_width=" wrap_content "android:layout_height=" wrap_content "android:text=" format "/>" 
 ;/linearlayout> </LinearLayout>

The code in the

corresponding activity is as follows:

Package Com.example.timer; 
Import android.app.Activity; 
Import Android.os.Bundle; 
Import Android.os.SystemClock; 
Import Android.view.View; 
Import Android.view.View.OnClickListener; 
Import Android.widget.Button; 
 
Import Android.widget.Chronometer; 
 public class Mainactivity extends activity {private chronometer mychronometer = null; 
 Private Button btnstart = null; 
 Private Button btnstop = null; 
 Private Button btnbase = null; 
 
 Private Button Btnformat = null; public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);//life cycle method Super.setcontentview (R . Layout.activity_main); 
 Set the layout manager to use This.mychronometer = (chronometer) super. Findviewbyid (R.id.mychronometer); 
 btnstart = (Button) Super.findviewbyid (R.id.btnstart); 
 Btnstop = (Button) Super.findviewbyid (r.id.btnstop); 
 Btnbase = (Button) Super.findviewbyid (r.id.btnbase); 
 Btnformat = (Button) Super.findviewbyid (R.id.btnformat); Btnstart.setonclicklistener (New OnclicklistEnerstart ()); 
 Btnstop.setonclicklistener (New Onclicklistenerstop ()); 
 Btnbase.setonclicklistener (New Onclicklistenerbase ()); 
 Btnformat.setonclicklistener (New Onclicklistenerformat ()); Private class Onclicklistenerstart implements Onclicklistener {public void OnClick (View arg0) {Mychronomete 
 
 R.start (); } Private class Onclicklistenerstop implements Onclicklistener {public void OnClick (View arg0) {MyChron 
 
 Ometer.stop (); } Private class Onclicklistenerbase implements Onclicklistener {public void OnClick (View arg0) {MyChron 
 
 Ometer.setbase (Systemclock.elapsedrealtime ()); } Private class Onclicklistenerformat implements Onclicklistener {public void OnClick (View arg0) {MYCHR Onometer.setformat ("New display format:%s"). 
 
 "); 
 } 
 
 } 
 
}

Running run up look at the effect:

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