Android中的Chronometer

这个例子演示的是点击按钮之后，计数增长，到20后自动停止

其中main.xml代码为：

 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     <Button14         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     @Override15     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             @Override25             public void onClick(View arg0) {26                 ch.setBase(SystemClock.elapsedRealtime());27                 ch.start();28             }29         });30         ch.setOnChronometerTickListener(new OnChronometerTickListener() {31 32             @Override33             public void onChronometerTick(Chronometer arg0) {34                 if (SystemClock.elapsedRealtime() - ch.getBase() > 20 * 1000) {35                     ch.stop();36                 }37 38             }39         });40     }41 }

转自：http://www.cnblogs.com/rollenholt/archive/2012/05/17/2506054.html

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