private void setAlarmTime(Context context, long triggerAtMillis) { 
  AlarmManager am = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE); 
  Intent intent = new Intent("android.alarm.demo.action"); 
  PendingIntent sender = PendingIntent.getBroadcast( 
    context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); 
  //鬧鈴間隔， 這里設(shè)為1分鐘鬧一次，在第2步我們將每隔1分鐘收到一次廣播 
  //int interval = 60 * 1000; 
  //am.setRepeating(AlarmManager.RTC_WAKEUP, timeInMillis, interval, sender); 
  am.set(AlarmManager.RTC_WAKEUP, triggerAtMillis, sender); 
 } 

public class AlarmReceiver extends BroadcastReceiver { 
 public void onReceive(Context context, Intent intent) { 
  if ("android.alarm.demo.action".equals(intent.getAction())) { 
   // 第1步中設(shè)置的鬧鈴時(shí)間到，這里可以彈出鬧鈴提示并播放響鈴 
   Toast.makeText(context, "hello alarm", Toast.LENGTH_LONG).show(); 
   System.out.println("hello alarm"); 
   // 可以繼續(xù)設(shè)置下一次鬧鈴時(shí)間; 
   return; 
  } 
 } 
} 

<receiver android:name="AlarmReceiver"> 
   <intent-filter> 
    <action android:name="android.alarm.demo.action" /> 
   </intent-filter> 
  </receiver> 

public class BootReceiver extends BroadcastReceiver { 
 public void onReceive(Context context, Intent intent) { 
  String action = intent.getAction(); 
  if (action.equals(Intent.ACTION_BOOT_COMPLETED)) { 
   //重新計(jì)算鬧鈴時(shí)間，并調(diào)第一步的方法設(shè)置鬧鈴時(shí)間及鬧鈴間隔時(shí)間 
  } 
 } 
} 

<receiver android:name="BootReceiver"> 
 <intent-filter> 
  <action android:name="android.intent.action.BOOT_COMPLETED" /> 
 </intent-filter> 
 </receiver> 

alarmManager.set(AlarmManager.RTC_WAKEUP, (5*1000), sender); 

public static final int ELAPSED_REALTIME 
 //當(dāng)系統(tǒng)進(jìn)入睡眠狀態(tài)時(shí)，這種類型的鬧鈴不會(huì)喚醒系統(tǒng)。直到系統(tǒng)下次被喚醒才傳遞它，該鬧鈴所用的時(shí)間是相對(duì)時(shí)間，是從系統(tǒng)啟動(dòng)后開始計(jì)時(shí)的,包括睡眠時(shí)間，可以通過調(diào)用SystemClock.elapsedRealtime()獲得。系統(tǒng)值是3 (0x00000003)。 

public static final int ELAPSED_REALTIME_WAKEUP 
 //能喚醒系統(tǒng)，用法同ELAPSED_REALTIME，系統(tǒng)值是2 (0x00000002) 。 

public static final int RTC 
 //當(dāng)系統(tǒng)進(jìn)入睡眠狀態(tài)時(shí)，這種類型的鬧鈴不會(huì)喚醒系統(tǒng)。直到系統(tǒng)下次被喚醒才傳遞它，該鬧鈴所用的時(shí)間是絕對(duì)時(shí)間，所用時(shí)間是UTC時(shí)間，可以通過調(diào)用 System.currentTimeMillis()獲得。系統(tǒng)值是1 (0x00000001) 。 
 
public static final int RTC_WAKEUP 
 //能喚醒系統(tǒng)，用法同RTC類型，系統(tǒng)值為 0 (0x00000000) 。 

alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime()+5000, sender); 

alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+5000, sender);