android 开发的定时闹钟

package com.example.test0125;
 
import java.util.Calendar;
 
import Android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
 
/**
 * Alarm,定时闹钟
 * @author ZLQ
 *
 */
public class TestAlarm extends Activity {
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
 
  //通过 getSystemService取得服务
  AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
 
  Calendar ca = Calendar.getInstance();
  ca.set(Calendar.YEAR, 2013);
  ca.set(Calendar.MONTH, 0);
  ca.set(Calendar.DATE, 25);
  ca.set(Calendar.HOUR_OF_DAY, 16);
  ca.set(Calendar.MINUTE, 35);
  ca.set(Calendar.SECOND, 0);