Android中的Chronometer 安卓中的time时钟控件 定时执行操作

1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="fill_parent" 4 android:layout_height="fill_parent" 5 android:orientation="vertical" > 6 7 <Chronometer 8 android:id="@+id/chronometer1" 9 android:layout_width="wrap_content" 10 android:layout_height="wrap_content" 11 android:text="Chronometer" /> 12 13 <Button 14 android:id="@+id/button1" 15 android:layout_width="wrap_content" 16 android:layout_height="wrap_content" 17 android:text="Start" /> 18 19 </LinearLayout>

java代码为：

 1 package android.demo;  2 
 3 import android.app.Activity;  4 import android.os.Bundle;  5 import android.os.SystemClock;  6 import android.view.View;  7 import android.view.View.OnClickListener;  8 import android.widget.Button;  9 import android.widget.Chronometer; 10 import android.widget.Chronometer.OnChronometerTickListener; 11 
12 public class AndroidDemo5Activity extends Activity { 13     /** Called when the activity is first created. */
14     @Override 15     public void onCreate(Bundle savedInstanceState) { 16         super.onCreate(savedInstanceState); 17         setContentView(R.layout.main); 18 
19         Button start = (Button) findViewById(R.id.button1); 20         final Chronometer ch = (Chronometer) findViewById(R.id.chronometer1); 21 
22         start.setOnClickListener(new OnClickListener() { 23 
24             @Override 25             public void onClick(View arg0) { 26                 ch.setBase(SystemClock.elapsedRealtime()); 27                 ch.start(); 28             } 29         }); 30         ch.setOnChronometerTickListener(new OnChronometerTickListener() { 31 
32             @Override 33             public void onChronometerTick(Chronometer arg0) { 34                 if (SystemClock.elapsedRealtime() - ch.getBase() > 20 * 1000) { 35                     ch.stop(); 36                 } 37 
38             } 39         }); 40     } 41 }