Learn the Android<chronometer Timer component from scratch. 32 .>

Timers to calculate the time spent by each athlete, and in the Android system, this chronograph function can be used with the chronometer component, the inheritance structure of this class is as follows:2Java.lang.Object?Android.view.View?Android.widget.TextView?Android.widget.Chronometer
a common approach
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1	public Chr Onometer (Context context)	construct	Create chronometer object
2	public long GetBase ()	normal	sets a base time that can be done by completing the
3	public void SetFormat (String format)	normal	setting display format
4	public Long getbase ()	General	return the set base time
5	public String getFormat ()	normal	returns the display of the setting Format
6	public void Start ()	normal	start timing
7	public void Stop ()	normal	stop timing
8	public void set Onchronometerticklistener (Chronometer.onchronometerticklistener listener)	normal	setting a listener event for timing change

XML File

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools "android:layout_width=" match_parent "android:layout_height=" Match_parent "Android:paddi ngbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_horizontal_margin" Android: paddingright= "@dimen/activity_horizontal_margin" android:paddingtop= "@dimen/activity_vertical_margin" tools: Context= ". Mainactivity "> <button android:id=" @+id/button1 "style="? Android:attr/buttonstylesmall "and        Roid:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_alignparentleft= "true"        Android:layout_centervertical= "true" android:text= "Start"/> <button android:id= "@+id/button3" Style= "? Android:attr/buttonstylesmall" Android:layout_width= "wrap_content" android:layout_height= "Wra P_content "Android:layout_centervertical=" TruE "android:layout_torightof=" @+id/button2 "android:text=" reset "/> <button android:id=" @+id/but Ton2 "style="? Android:attr/buttonstylesmall "Android:layout_width=" Wrap_content "Android:layout_heigh t= "Wrap_content" android:layout_centervertical= "true" android:layout_torightof= "@+id/button1" Android : text= "Stop"/> <button android:id= "@+id/button4" style= "? Android:attr/buttonstylesmall" Andro        Id:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_alignparentright= "true" Android:layout_centervertical= "true" android:layout_marginright= "24DP" android:text= "formatted display"/> & Lt Chronometer android:id= "@+id/chronometer1" android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_above= "@+id/button3" android:layout_alignleft= "@+id/button3" Android:la Yout_marginbottom= "52DP "android:textsize=" 25DP "android:text=" chronometer "/></relativelayout> 

Java files

Package Com.example.chronometer;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 {public Button start;public button stop;public Button Reset;public button format;public chronometer chronometer; Butoperator operator = new Butoperator (), @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (r.layout.activity_main); start = (Button) This.findviewbyid (r.id.button1); stop = (button) This.findviewbyid (r.id.button2); reset = (Button) This.findviewbyid (r.id.button3); format = (button) This.findviewbyid (R.id.button4); chronometer= (chronometer) This.findviewbyid (r.id.chronometer1); Start.setonclicklistener (This.operator); Stop.setonclicklistener (This.operator); Reset.setonclicklistener ( This.operator); Format.setonclicklistener (this.operator);} ClassButoperator implements Onclicklistener {@Overridepublic void OnClick (view view) {//TODO auto-generated method Stubswitch (View.getid ()) {Case r.id.button1://starts timing MainActivity.this.chronometer.start (); Break;case r.id.button2:// Stop timing MainActivity.this.chronometer.stop (); break;case r.id.button3://reset Parameter MainActivity.this.chronometer.setBase ( Systemclock.elapsedrealtime ()); Break;case r.id.button4://formatted Data MainActivity.this.chronometer.setFormat ("Current date:%s" ); break;default:break;}}}

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Learn the Android<chronometer Timer component from scratch. 32 .>