Android控件Chronometer定时器的实现方法

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package wjq.WidgetDemo;

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 ChronometerDemo extends Activity {
private Chronometer mChronometer;
 /* (non-Javadoc)
 * @see android.app.Activity#onCreate(android.os.Bundle)
 */
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 // TODO Auto-generated method stub
 super.onCreate(savedInstanceState);
 setContentView(R.layout.chronometerpage);
 Button button;

 mChrOnometer= (Chronometer) findViewById(R.id.chronometer);

 // Watch for button clicks.
 button = (Button) findViewById(R.id.start);
 button.setOnClickListener(mStartListener);

 button = (Button) findViewById(R.id.stop);
 button.setOnClickListener(mStopListener);

 button = (Button) findViewById(R.id.reset);
 button.setOnClickListener(mResetListener);

 button = (Button) findViewById(R.id.set_format);
 button.setOnClickListener(mSetFormatListener);

 button = (Button) findViewById(R.id.clear_format);
 button.setOnClickListener(mClearFormatListener);
 }

 View.OnClickListener mStartListener = new OnClickListener() {
 public void onClick(View v) {
 mChronometer.start();
 }
 };

 View.OnClickListener mStopListener = new OnClickListener() {
 public void onClick(View v) {
 mChronometer.stop();
 }
 };

 View.OnClickListener mResetListener = new OnClickListener() {
 public void onClick(View v) {
 mChronometer.setBase(SystemClock.elapsedRealtime());
 }
 };

 View.OnClickListener mSetFormatListener = new OnClickListener() {
 public void onClick(View v) {
 mChronometer.setFormat("Formatted time (%s)");
 }
 };

 View.OnClickListener mClearFormatListener = new OnClickListener() {
 public void onClick(View v) {
 mChronometer.setFormat(null);
 }
 };
}