<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent" >	<Chronometer 	    android:id="@+id/myChronometer"	    android:layout_width="wrap_content"	    android:layout_height="wrap_content"/>	<LinearLayout 	    android:orientation="horizontal"	    android:layout_width="fill_parent"	    android:layout_height="fill_parent">	    <Button 	        android:id="@+id/butStart"	        android:text="开始计时"	        android:layout_width="wrap_content"	        android:layout_height="wrap_content"/>	    <Button 	        android:id="@+id/butStop"	        android:text="停止计时"	        android:layout_width="wrap_content"	        android:layout_height="wrap_content"/>	</LinearLayout></LinearLayout>

package com.example.myclock;import android.os.Bundle;import android.os.SystemClock;import android.os.Vibrator;import android.app.Activity;import android.app.Service;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Chronometer;import android.widget.Chronometer.OnChronometerTickListener;public class MainActivity extends Activity {	private Chronometer myChronometer = null;	private Button butStart = null;	private Button butStop = null;	private Vibrator vibrator = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        this.myChronometer = (Chronometer)super.findViewById(R.id.myChronometer);        this.vibrator = (Vibrator)super.getApplication().getSystemService(Service.VIBRATOR_SERVICE);        this.butStart = (Button)super.findViewById(R.id.butStart);        this.butStop = (Button)super.findViewById(R.id.butStop);        this.butStart.setOnClickListener(new OnClickListenerlmplStart());        this.butStop.setOnClickListener(new OnClickListenerlmplStop());        this.myChronometer.setFormat("当前计时时间：%s。");        this.myChronometer.setOnChronometerTickListener(new OnChronometerTickListenerlmpl());            }    private class OnChronometerTickListenerlmpl implements OnChronometerTickListener{    	public void onChronometerTick(Chronometer chronometer){    		String time = chronometer.getText().toString().replaceAll("[^(\\d{2}:\\d{2})]", "");    		if("01:00".equals(time)){    			MainActivity.this.vibrator.vibrate(new long[]{1000,10,1000,100},0);    		}		    	}    }    private class OnClickListenerlmplStart implements OnClickListener{    	public void onClick(View view){    		MainActivity.this.myChronometer.start();    	}    }    private class OnClickListenerlmplStop implements OnClickListener{    	public void onClick(View view){    		MainActivity.this.myChronometer.stop();    		MainActivity.this.myChronometer.setBase(SystemClock.elapsedRealtime());    		MainActivity.this.vibrator.cancel();    	}    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.activity_main, menu);        return true;    }}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.myclock"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="16"        android:targetSdkVersion="15" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/title_activity_main" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>	<uses-permission 	    android:name="android.permission.VIBRATE"/></manifest>